ZXMW NR8250 Product Description

ZXMW NR8250 Product
Description
6/7/8/8.5/11/15/18/23/38 GHz

ZXMW NR8250 Product Description
ZTE Confidential Proprietary © 2011 ZTE CORPORATION. All rights reserved. I
Version Date Author Approved By Remarks
V1.00_01 2011-02-21 Zhu Linlin First English revision
© 2011 ZTE Corporation. All rights reserved.
ZTE CONFIDENTIAL: This document contains proprietary information of ZTE and is not to be disclosed
or used without the prior written permission of ZTE.
Due to update and improvement of ZTE products and technologies, information in this document is
subjected to change without notice.

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TABLE OF CONTENTS
1 Overview ......................................................................................................... 1
1.1 About ZXMW NR8250 ...................................................................................... 1
1.2 Product Appearance......................................................................................... 1
1.3 Network Applications ........................................................................................ 3
2 Features .......................................................................................................... 4
2.1 Hybrid & Native Microwave Transmission Solution ........................................... 4
2.2 Service Cross Connect Function....................................................................... 4
2.3 Six-Directions Aggregation Node...................................................................... 4
2.4 ACM – Adaptive Coding & Modulation.............................................................. 5
2.5 Ethernet Switching............................................................................................ 5
2.6 QoS – Quality of Service .................................................................................. 6
2.7 SNCP Protection for TDM................................................................................. 6
2.8 RSTP/STP........................................................................................................ 6
2.9 ATPC – Automatic Transmitter Power Control.................................................. 7
3 Hardware Description..................................................................................... 7
3.1 IDU................................................................................................................... 7
3.2 ODU ................................................................................................................. 7
3.2.1 Appearance...................................................................................................... 8
3.2.2 Interface Description....................................................................................... 10
3.2.3 Installation Methods........................................................................................ 13
4 Boards........................................................................................................... 16
4.1 Board Layout.................................................................................................. 16
4.2 RCUA ............................................................................................................. 17
4.2.1 Function Description....................................................................................... 17
4.2.3 LED Indicator Description ............................................................................... 18
4.2.4 Block Diagram ................................................................................................ 19
4.3 RMUB............................................................................................................. 19
4.3.4 Block Diagram ................................................................................................ 21
4.4 RTUA (16 x E1) .............................................................................................. 22
4.4.3 LED Indicator Description............................................................................... 23
4.4.4 Block Diagram ................................................................................................ 23
4.5 RTUB (8 x E1 + 1 x STM-1 + 1 x STM-1/4)..................................................... 24
4.5.4 Block Diagram ................................................................................................ 26
4.6 RTUMO (2 x GbE(O) / 4 x FE)........................................................................ 26

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4.6.4 Block Diagram ................................................................................................ 27
4.7 RTUME (2 x GbE(E) / 4 x FE)......................................................................... 28
4.7.4 Block Diagram ................................................................................................ 29
4.8 PM.................................................................................................................. 30
4.9 RPUA ............................................................................................................. 32
4.10 RFAA.............................................................................................................. 33
4.10.2 LED Indicator Description............................................................................... 34
5 Network Management System ..................................................................... 35
5.1 WEB LMT....................................................................................................... 35
6 Technical Parameters................................................................................... 37
6.1 Physical Parameters....................................................................................... 37
6.1.1 Dimension and Weight.................................................................................... 37
6.1.2 Power Voltage ................................................................................................ 38
6.1.3 Temperature and Humidity ............................................................................. 38
6.1.4 Power Consumption ....................................................................................... 38
6.2 IDU Parameters.............................................................................................. 38
6.2.1 Channel Bandwidth......................................................................................... 39
6.2.2 Modulation Mode............................................................................................ 39
6.2.3 System Capacity............................................................................................. 39
6.2.4 Interface Parameters ...................................................................................... 40
6.3 ODU Parameters............................................................................................ 40
6.3.1 Frequency Parameters ................................................................................... 40
6.3.2 Tx/Rx Spacing ................................................................................................ 40
6.3.3 Intermediate Frequency (IF) Signals............................................................... 41
6.3.4 Interface Parameters ...................................................................................... 42
6.4 Power Parameters.......................................................................................... 42
6.4.1 Transmit Power .............................................................................................. 42
6.4.2 Receive Power ............................................................................................... 43
6.5 Reliability Parameters..................................................................................... 44
6.5.1 Standard Compliance ..................................................................................... 44
6.5.2 Fault Tolerance Parameters ........................................................................... 45
6.5.3 RSSI Parameters............................................................................................ 45
6.5.4 Anti-Continuous-Wave Interference Parameters............................................. 45
7 Network Configuration ................................................................................. 47
7.1 N x (1+0) Network Configuration..................................................................... 47
7.1.1 Configuration Requirements (Single Site)....................................................... 47
7.1.2 Configuration Diagram.................................................................................... 48
7.1.3 Configuration Principle.................................................................................... 48

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7.2 N x (1+1 HSB) Configuration .......................................................................... 48
7.2.4 Switchover Principle ....................................................................................... 50
7.3 N x (1+1 SD) Configuration............................................................................. 51
7.4 N x (1+1 FD) Configuration............................................................................. 53
7.5 SNCP Ring Networking .................................................................................. 56
7.5.2 Networking Diagram ....................................................................................... 56
7.5.3 Networking Principle....................................................................................... 57
7.6 RSTP Ring Networking................................................................................... 58
7.7 Nodal Networking ........................................................................................... 60
8 Abbreviations................................................................................................ 63

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FIGURES
Figure 1-1 NR8250 IDU ..........................................................................................................2
Figure 1-2 6 ~ 11 GHz ODU ...................................................................................................2
Figure 1-3 15 ~ 38 GHz ODU .................................................................................................2
Figure 1-4 Example of Link Aggregation Solution ...................................................................3
Figure 3-1 6 ~ 11 GHz ODU (Front View) ...............................................................................8
Figure 3-2 6/7/8/8.5 GHz ODU (Rear View)............................................................................8
Figure 3-3 11 GHz ODU (Rear View)......................................................................................9
Figure 3-4 15 ~ 38 GHz ODU (Front View) .............................................................................9
Figure 3-5 15 ~ 38 GHz ODU (Rear View)............................................................................10
Figure 3-6 15 ~ 38 GHz ODU (Bottom View) ........................................................................10
Figure 3-7 6 ~ 11 GHz ODU Interfaces.................................................................................11
Figure 3-8 15 GHz ~ 38 GHz ODU Interfaces.......................................................................12
Figure 4-1 NR8250 IDU Board Layout .................................................................................16
Figure 4-2 RCUA Board........................................................................................................17
Figure 4-3 RCUA Block Diagram ..........................................................................................19
Figure 4-4 RMUB Board .......................................................................................................20
Figure 4-5 RMUB Block Diagram..........................................................................................22
Figure 4-6 RTUA Board........................................................................................................22
Figure 4-7 RTUA Block Diagram...........................................................................................24
Figure 4-8 RTUB Board........................................................................................................25
Figure 4-9 RTUB Block Diagram...........................................................................................26
Figure 4-10 RTUMO board ...................................................................................................27
Figure 4-11 RTUMO Block Diagram .....................................................................................28
Figure 4-12 RTUME Board ...................................................................................................28
Figure 4-13 RTUME Block Diagram......................................................................................30
Figure 4-14 PM Board ..........................................................................................................31
Figure 4-15 RPUA Board......................................................................................................32
Figure 4-16 RFAA Board ......................................................................................................33
Figure 6-1 RSSI Parameters.................................................................................................45
Figure 7-1 1+0 Networking Configuration .............................................................................48
Figure 7-2 1+0 Configuration Principle..................................................................................48
Figure 7-3 1+1 HSB Configuration........................................................................................49
Figure 7-4 1+1 HSB Configuration Principle .........................................................................50

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Figure 7-5 1+1 SD Configuration .........................................................................................52
Figure 7-6 1+1 SD Configuration Principle............................................................................52
Figure 7-7 1+1 FD Configuration Diagram ............................................................................54
Figure 7-8 1+1 FD Configuration Diagram ............................................................................55
Figure 7-9 SNCP Networking Diagram .................................................................................57
Figure 7-10 SNCP Networking Principle ...............................................................................57
Figure 7-11 RSTP Networking Diagram................................................................................59
Figure 7-12 1+1 RSTP Networking Principle.........................................................................59
Figure 7-13 2 x (1+0) + 2 x (1+1 HSB) Networking Diagram.................................................60
TABLES
Table 2-1 Ethernet Protocols ..................................................................................................5
Table 3-1 6 ~ 11 GHz ODU ..................................................................................................11
Table 3-2 15 ~ 38 GHz ODU Interface Description ...............................................................12
Table 3-3 Detached Installation of 6 ~ 8.5 GHz ODU............................................................13
Table 3-4 Attached Installation of 11 ~ 38 GHz ODU............................................................14
Table 3-5 Detached Installation of 11 ~ 38 GHz ODU...........................................................14
Table 4-1 NR8250 IDU Board Description ...........................................................................16
Table 4-2 RCUA Interface Description..................................................................................17
Table 4-3 RCUA LED Indicator Description ..........................................................................18
Table 4-4 RMUB Interface Description..................................................................................20
Table 4-5 RMUB LED Indicator Description..........................................................................20
Table 4-6 RTUA Interface Description ..................................................................................23
Table 4-7 RTUA LED Indicator Description...........................................................................23
Table 4-8 RTUB Interface Description ..................................................................................25
Table 4-9 RTUB LED Indicator Description...........................................................................25
Table 4-10 RTUMO Interface Description.............................................................................27
Table 4-11 RTUMO LED Indicator Description .....................................................................27
Table 4-12 RTUME Interface Description .............................................................................29
Table 4-13 RTUME LED Indicator Description......................................................................29
Table 4-14 PM Interface Description.....................................................................................31
Table 4-15 PM LED Indicator Description.............................................................................31
Table 4-16 RPUA Interface Description ................................................................................32
Table 4-17 RPUA LED Indicator Description.........................................................................33
Table 4-18 RFAA LED Indicator Description.........................................................................34

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Table 6-1 Dimension and Weight..........................................................................................37
Table 6-2 Power Voltage Parameters ...................................................................................38
Table 6-3 Temperature and Humidity ...................................................................................38
Table 6-4 Typical Power Consumption ................................................................................38
Table 6-5 System Capacity (TDM and Ethernet)...................................................................39
Table 6-6 Tx/Rx Spacing Parameters...................................................................................40
Table 6-7 IF Signal Parameters............................................................................................41
Table 6-8 Interface Parameters ............................................................................................42
Table 6-9 Maximum Transmit Power ....................................................................................42
Table 6-10 Minimum Transmit Power ...................................................................................43
Table 6-11 ATPC Range ......................................................................................................43
Table 6-12 Threshold of Receive Power...............................................................................43
Table 6-13 Complied Standards ...........................................................................................44
Table 6-14 Anti-Continuous-Wave Interference Parameters.................................................45
Table 7-1 NR8250 Network Configurations...........................................................................47
Table 7-2 N x (1+0) Network Configuration...........................................................................47
Table 7-3 1+1 HSB Configuration .........................................................................................49
Table 7-4 1+1 SD Configuration ...........................................................................................51
Table 7-5 1+1 FD Configuration............................................................................................53
Table 7-6 SNCP Configuration .............................................................................................56
Table 7-7 SNCP Configuration .............................................................................................58
Table 7-8 2 x (1+0) + 2 x (1+1 HSB) Networking ..................................................................60

ZTE Confidential Proprietary 2011 ZTE CORPORATION. All rights reserved. 1
1 Overview
This chapter gives an overview of the ZXMW NR8250 Digital Microwave Radio
Transmission System (NR8250 for short).
1.1 About ZXMW NR8250
The ZXMW NR8250 is a next generation digital microwave radio system developed by
ZTE Corporation. It provides a nodal microwave radio solution with hybrid and native
transmission for high capacity transmission and aggregation node.
 Tip:
For detailed information on the Hybrid & Native solution, refer to Hybrid & Native
Microwave Radio Transmission Solution.
The NR8250 supports the following functions and features:
 Hybrid and native transmission of TDM and Ethernet services, native service
bearing mode, maximizing transmission capacity
 Radio transmission of TDM and Ethernet services on 6 to 38 GHz frequency band
that comply with ITU standard
 Support E1, STM1/4, Fast Ethernet (FE) and GbE (Gigabit Ethernet) services,
meeting the backhaul network requirement of smooth evolution from 2G to 3G
network.
 Software programmable QPSK ~ 256QAM modulation scheme with flexible
adjustment within 7 ~ 56 MHz channel spacing, reaching the maximum
transmission capacity at 56 MHz channel spacing of 2xSTM-1 TDM traffic or
400Mbps Ethernet traffic.
 Microwave radio aggregation node that supports six directions
The NR8250 adopts split-mount architecture, including indoor unit (IDU) and outdoor unit
(ODU). The ODU is waterproof and can be mounted with antenna in an integrated or
separated way.
1.2 Product Appearance
Figure 1-1 shows the front panel of an NR8250 IDU. Figure 1-2 shows a 6 ~ 11 GHz
ODU. Figure 1-3 shows a 15~38 GHz ODU.

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Figure 1-1 NR8250 IDU
Figure 1-2 6 ~ 11 GHz ODU
Figure 1-3 15 ~ 38 GHz ODU

ZTE Confidential Proprietary 2011 ZTE CORPORATION. All rights reserved. 3
1.3 Network Applications
The NR8250 can be widely used in aggregation nodes of 2G/3G mobile backhaul
network, providing nodal microwave radio transmission solution for high capacity
transmission at aggregation node, as shown in Figure 1-4. The nodal solution utilizes
traffic multiplexing (MUX) technology to simplify link aggregation operation and to
improve system reliability.
Figure 1-4 Example of Link Aggregation Solution

2 Features
 Tip:
For more information about NR8250 features, refer to the ZXMW NR8250 Feature
Description manual.
2.1 Hybrid & Native Microwave Transmission
Solution
The hybrid & native concept is introduced in NR8250 microwave radio transmission
solution. “Native” refers to the advanced native transmission technology while “Hybrid”
refers to the hybrid transmission without mapping. In the Hybrid & Native solution, native
TDM traffic and Ethernet traffic can share air interface bandwidth dynamically while
neither traffic type is mapped over the other.
The advantages of this feature are as follows:
 Low link latency, improving transmission efficiency
 Avoid unnecessary frame encapsulation overhead, maximizing radio bandwidth
utilization
 Reduce spectrum resource, enable operator to utilize the limited microwave
spectrum resource more effectively
2.2 Service Cross Connect Function
The NR8250 supports TDM cross connect function from E1 to STM-1 and from STM-1 to
E1. The maximum cross connect capacity is 3200E1*3200E1. Meantime it also supports
Ethernet cross connect function with maximum capacity of 10 GB.
2.3 Six-Directions Aggregation Node
As an aggregation node, the NR8250 supports maximum of six transmission directions.
The built-in MUX can support the nodal function of service switching without external
wiring at an aggregation site.

2.4 ACM – Adaptive Coding & Modulation
(ACM) refers to the technology of automatic coding and modulation scheme adjustment
based on channel quality. ACM can improve transmission efficiency and spectrum
utilization as well as protect the service reliability with high priority level during poor
channel quality
2.5 Ethernet Switching
The NR8250 supports the following Ethernet switching technologies:
 Provides 10/100/1000 Mbps self adaptive interface, supporting automatic
negotiation function and automatic transmission rate adjustment
 Supports auto MDI/MDIX function for all Ethernet interfaces
 Supports Ethernet bandwidth utilization statistics and remote monitoring
 Supports 8k Media Access Control (MAC) addresses
 Supports 4k VLANs complying with IEEE 802.1q standard
 Supports jumbo frame size of 1522 bytes
Table 2-1 shows the Ethernet protocols supported by the NR8250.
Table 2-1 Ethernet Protocols
Protocol Description
IEEE 802.1d STP
Spanning Tree Protocol (STP) can be used in resolving
network looping, where, through certain algorithms, some
redundant paths are blocked and the ring network is adapted
into a tree network without any loop. This prevents packets
from proliferating and infinite recycling in the loop network.
IEEE 802.1w RSTP
Rapid Spanning Tree Protocol (RSTP) is developed on the
basis of IEEE 802.1d STP.
IEEE 802.3x Frame traffic control protocol in full-duplex mode
IEEE Std 802.3
A collection of IEEE standards produced in defining the
physical layer and data link layer's MAC of wired Ethernet. It
is a local area network technology with some wide area
network applications. Physical connections are made
between nodes and/or infrastructure devices (hubs,
switches, routers) by various types of copper or fiber cable.
IEEE 802.1q VLAN
Virtual Bridged Local Area Networks (VBLAN) specifies the
implementations of VLAN.

2.6 QoS – Quality of Service
QoS is a security mechanism of the network to resolve network delay and congestion
problems. In case of network overload or congestion, QoS ensures important traffics are
not delayed or discarded; meanwhile, it guarantees the efficient network operation
2.7 SNCP Protection for TDM
The NR8250 supports Sub Network Connection Protection (SNCP) for TDM services,
which improves the microwave radio link transmission reliability.
 The flexible SNCP configuration can be applied in various networks such as
backbone network, relay network, and access network in different topologies such
as tree, ring, and mesh.
 The protection structure uses 1+1 mode and the principle is “dual transmitting and
selective receiving.
 Support air interface mode SNCP protection for E1 switchover protection.
2.8 RSTP/STP
The NR8250 supports Rapid Spanning Tree Protocol (RSTP) and Spanning Tree
Protocol (STP). RSTP is defined by IEEE802.1w and STP is defined by IEEE802.1d.
 STP
It can be used in resolving network looping, where, through certain algorithms,
some redundant paths are blocked and the ring network is adapted into a tree
network without any loop. This prevents broadcast storm in network looping.
 RSTP
It is developed on the basis of STP and provides faster convergence speed when
the network structure changes. Compared with STP, RSTP adds two port types:
alternate port and backup port.
RSTP has the following advantages to provide faster convergence speed than STP:
 In STP, port state and port role are not clearly differentiated, and the
convergence mainly depends on the switchover of port state. In RSTP, port
state and port role are clearly differentiated, and the convergence mainly
depends on the switchover of port role.
 The switchover of STP port states must passively wait for timeout. The
switchover of RSTP port states is an active negotiation.

 The non-root bridge in STP can only passively relay Bridge Protocol Data
Unit (BPDU). The non-root bridge in RSTP can actively send BPDU to
maintain the link to downstream nodes.
 Tip:
For information about RSTP configuration principle, refer to chapter 7.6 RSTP Ring
Network.
2.9 ATPC – Automatic Transmitter Power Control
The NR8250 supports ATPC function.
3 Hardware Description
The NR8250 adopts split-mount architecture, including indoor unit (IDU) and outdoor unit
(ODU).
3.1 IDU
The NR8250 IDU comprises of a casing and series of boards. It is 19 inches in width and
2U in height. It can be mounted on a standard 19-inch portal frame, on the wall, or the
desktop.
 Tip:
For detailed description of the boards, refer to chapter 4 Boards.
3.2 ODU
The NR8250 ODU supports 4 x E1 ~ 2 x STM-1 (TDM) or 10 ~ 400 Mbps (Ethernet)
capacity transmission at the 6 ~ 38 GHz frequency band. The NR8250 ODU has two
types based on frequency band, namely 6 ~ 11GHz ODU and 15 ~ 38GHz ODU. It can
be installed directly on the antenna or separately from the antenna.

3.2.1 Appearance
3.2.1.1 6 ~ 11 GHz ODU
Figure 3-1 shows the front view of a 6 ~ 11 GHz ODU. The rear of the ODU can be
differentiated with 6/7/8/8.5 GHz ODU and 11 GHz ODU, as shown in Figure 3-2 and
Figure 3-3 respectively.
Figure 3-1 6 ~ 11 GHz ODU (Front View)
Figure 3-2 6/7/8/8.5 GHz ODU (Rear View)

Figure 3-3 11 GHz ODU (Rear View)
3.2.1.2 15 ~ 38 GHz ODU
Figure 3-4 shows the front view of a 15 ~ 38 GHz ODU. Figure 3-5 shows the rear view
and Figure 3-6 shows the bottom view.
Figure 3-4 15 ~ 38 GHz ODU (Front View)

Figure 3-5 15 ~ 38 GHz ODU (Rear View)
Figure 3-6 15 ~ 38 GHz ODU (Bottom View)
3.2.2 Interface Description
ODU interfaces are those connected with the IDU and antenna.
3.2.2.1 6 ~ 11 GHz ODU
Figure 3-7 describes the interfaces of the 6 ~ 11 GHz ODU.

Figure 3-7 6 ~ 11 GHz ODU Interfaces
Table 3-1 describes the interfaces of the 6~11 GHz ODU.
Table 3-1 6 ~ 11 GHz ODU
Interface Type Description
IFL (IF IN/OUT) N-type male connector
IF signal input and
output interface
FG (Frame Ground) Bolt
Interface of grounding
cable
Rx LEV MON F connector, type C15
Receiving level
monitoring
RF IN/OUT
6/7/8/8.5
GHz
N (Female)
RF input and output
interface
11 GHz
PDR100
(waveguide
flange)

3.2.2.2 15 ~ 38 GHz ODU
Figure 3-8 15 GHz ~ 38 GHz ODU Interfaces
Table 3-2 describes the interfaces of the 15 ~ 38 GHz ODU.
Table 3-2 15 ~ 38 GHz ODU Interface Description
IFL (IF IN/OUT) N-type male connector
IF signal input/output
interface
FG (Frame Ground) Bolt
Interface of grounding
cable
Rx LEV MON F connector, type C15
Receiving level
monitoring
RF IN/OUT
Waveguide flange
RF input/output
interface
15GHz PBR140
18/23GHz PBR220
38GHz PBR32

3.2.3 Installation Methods
NR8250 ODU has two installation methods: attached and detached installation. 6 ~ 8.5
GHz ODU supports detached installation while 11 ~ 38 GHz ODU supports both
attached installation and detached installation.
3.2.3.1 6 ~ 8.5 GHz ODU
6 ~ 8.5 GHz ODU supports only detached installation. Table 3-3 describes the
installation.
Table 3-3 Detached Installation of 6 ~ 8.5 GHz ODU
Type Installation Diagram Description
1+0
ODU is connected with the antenna
through one coaxial cable.
1+1
Two ODUs are connected with the
antenna by two coaxial cables
through the combiner.

3.2.3.2 11 ~ 38 GHz ODU
11 ~ 38 GHz ODU supports both attached and detached installation modes.
Table 3-4 describes the attached installation.
Table 3-4 Attached Installation of 11 ~ 38 GHz ODU
Type Installation Diagram Description
1+0
ODU is directly connected with the
antenna.
1+1
antenna by the combiner.
Table 3-5 describes the detached installation.
Table 3-5 Detached Installation of 11 ~ 38 GHz ODU
Installation Diagram Description

Installation Diagram Description
1+0
ODU is connected with the antenna
through the flexible waveguide.
1+1
antenna by the combiner through the
flexible waveguide.

4 Boards
This chapter gives the IDU board layout and detailed description of each board.
4.1 Board Layout
NR8250 IDU comprises the following boards:
 Radio Core Unit (RCU)
 Radio Modem Unit (RMU)
 Radio Traffic Unit (RTU)
 Power Module (PM) and ODU Power Unit (RPU)
 Radio Fan (RFA)
NR8250 IDU has 12 slots. Figure 4-1 shows the board layout.
Figure 4-1 NR8250 IDU Board Layout
slot10 slot1
slot11
slot2
slot3
slot4
slot12
slot5
slot6
slot7
slot8
slot9
Table 4-1 describes the boards and their corresponding slots.
Table 4-1 NR8250 IDU Board Description
Board
Type
Board
Name
Board Description Available
Slots
RCU RCUA Radio Core Unit A Slot 1
RMU RMUB Radio Modem Unit B Slots 3–8
RTU
RTUA Radio Traffic Unit A (16E1) Slots 2–8
RTUB Radio Traffic Unit B (8×E1+1×STM-
1+1×STM1/4)
Slot s 2–8

Board
Type
Board
Name
Board Description Available
Slots
RTUMO Radio Traffic Unit Module Optical (2 x
GbE(O)+4 x FE)
Slots 2–8
RTUME Radio Traffic Unit Module Electrical (2 x
GbE(E)+4 x FE)
slot 2–8
PM PM Power Module (for IDU) slot 10–11
RPU RPUA Radio Power Unit A (for ODU) slot 12
RFA RFAA Radio Fan A slot 9
4.2 RCUA
4.2.1 Function Description
RCUA board is for system main control, clock, and switching. It can be installed in slots
1~2. Its specific functions are as follows:
 Performs system main control
 Implements system clock synchronization, providing working clock for other boards
through the CLKIN/OUT interface
 Provides TDM service cascading interface (TDMEXT interface)
 Supports Ethernet service switching through GbE interface
 Provides NMS, EOW, and debugging interfaces
Figure 4-2 shows the RCUA board.
Figure 4-2 RCUA Board
SYS
ALM
RUN
CS
M/S
NMS GbE CLK IN/OUT EOW
TDMEXT DEBUG
RST
M/S
CALL
RCUA
Table 4-2 describes the interfaces on the RCUA board.
Table 4-2 RCUA Interface Description
NMS RJ45 NMS service interface (10/100/1000Base-T)
GbE RJ45 Gigabit Ethernet service interface (10/100/1000Base-T)

TDMEXT RJ45
Reserved port device cascading interface, TDM service
cascading interface (10/100/1000Base-T)
DEBUG RJ45 FE port for debugging
CLK IN/OUT RJ45
Clock input or output configurable interface, including
2MHz/2Mbps BITS clock and 1PPS+TOD clock
EOW RJ45 Engineering Order Wire interface
CALL Button Call button, used in combination with EOW interface
M/S Button
Used for active/standby switchover
Not supported currently
RST Button Used for resetting the board
4.2.3 LED Indicator Description
Table 4-3 describes the status of the LED indicators on the RCUA board.
Table 4-3 RCUA LED Indicator Description
Name Color Description Status Description
RUN Green
Running status
indication
Slow flashing: running normally
Fast flashing: restarting, or the link to
RCUA control plane is broken.
ON/OFF: faulty.
ALM Red
Alarm
indication
Fast flashing: critical or major alarm
Slow flashing: minor alarm or
warning
OFF: no alarm
M/S Green
Active/Standby
indication
ON: working as active board
OFF: working as standby board
Note: Currently, active/standby switchover is not
supported.
CS Green
Clock source
indication
ON: working as active clock source
Slow flashing: working as standby
clock source
OFF: no clock source
SYS Red/Yellow/Green
System
indication
Green: running normally
Red: fast flashing (critical alarm); ON
(major alarm)
Yellow: minor alarm or warning
OFF: exception occurs
 Tip:

Alarms are classified into four severity levels, which are critical, major, minor, and warning
in a descending order.
4.2.4 Block Diagram
Figure 4-3 shows the block diagram of the RCUA board.
Figure 4-3 RCUA Block Diagram
CPU control
module
Back
Plane
Clock module
Dual Service
switch channel
Logic control
module
Service
signal
Clock
signal
GbE
EOW
CLK IN/OUT
NMS
Control
signal
Power
module
+12V
TDMEXT
Network management
Network
management，
EOW
Clock
signal
Control BUS
Clock
selection
DEBUG
Dual Service
switch channel
4.3 RMUB
The RMUB board is a modulation/demodulation board, It can be installed in slots 3 ~ 8.
Its specific functions are as follows:
 Provides -48 V power for ODU
 Provides QPSK ~ 256 QAM modulation/demodulation function
 Modulation: codes and modulates the baseband signals from RCUA to IF
signals and sends them to ODU through the IF interface.
 Demodulation: demodulates and decodes the IF signals from ODU to
baseband signals and sends them to RCUA.
 Supports ACM, ATPC, and QoS

 Supports 1+1 HSB/SD/FD protection
 Supports the transmission capacity of 400 Mbps for one carrier
 Supports under/over-voltage protection and over-current protection at IF interface
Figure 4-4 shows the RMUB board.
Figure 4-4 RMUB Board
OD
U
ALM
RUN
LINK
RST
RMUB
TX
RX
IF
ON
OFF
OPWR
OPWR
Table 4-4 describes the interfaces on the RMUB board.
Table 4-4 RMUB Interface Description
OPWR
Power
switch
ODU power switch
IF
Female
TNC
connector
Input /output interface of IF signals
RST Button Reset button for RMUB
Table 4-5 describes the status of the LED indicators on the RMUB board.
Table 4-5 RMUB LED Indicator Description
RUN Green
Running status
indication
RCUA control plane is broken
ON/OFF: faulty
ALM Red
Alarm
indication
Slow flashing: minor alarm or warning
OFF: no alarm
Tx Green
ODU
transmitting
power status
ON: The ODU connecting with the RMU is
in transmitting power state.
OFF: The ODU connecting with the RMU is

indication in silent state.
Rx Green
RMUB working
status
indication
ON: The RMU board is in working state.
OFF: The RMU board is in protection state.
LINK Green
Radio link
synchronization
indication
ON: The radio link is in synchronized state.
OFF: The radio link is in out-of-
synchronization state.
Fast flashing: The radio link is in
synchronizing state.
OPWR Green
ODU power
indication
ON: ODU is powered on normally.
OFF: ODU is not powered on.
ODU Red/Green
ODU status
indication
ON: The communication between ODU
and IDU is normal.
OFF: The communication between ODU
and IDU has error.
 Tip:
Alarms are classified into four severity levels, which are critical, major, minor, and warning
in a descending order.
4.3.4 Block Diagram
Figure 4-5 shows the block diagram of the RMUB board.

Figure 4-5 RMUB Block Diagram
CPU control BUS
Back
Plane
MUX
Modem module
IF process
module
Service
signal
Clock
signal
IF
Power
module
+12V
Control
BUS
Data
BUS
Data
BUS
-48V
OPWR
Control
BUS
Control
BUS
4.4 RTUA (16 x E1)
The RTUA board is a system traffic board A. It can be installed in slots 2 ~ 8. It provides
access of 16 E1 services.
Figure 4-6 shows the RTUA board.
Figure 4-6 RTUA Board
ALM
RUN
E1
RST
RTUA
E1 CH1 – CH16
Table 4-6 describes the interfaces on the RTUA board.

Table 4-6 RTUA Interface Description
E1 CH1-
CH16
DB68 Capacity: 16 x E1
RST Button Reset button for RTUA
Table 4-7 describes the status of the LED indicators on the RTUA board.
Table 4-7 RTUA LED Indicator Description
RUN Green
Running status
indication
Fast flashing: restarting, or the link to RCUA
control plane is broken
ON/OFF: faulty
ALM Red
Alarm
indication
OFF: no alarm
E1 Green
E1 link status
indication
ON: All the 16 E1 signals are normal.
OFF: All the 16 E1 signals are lost.
Slow flashing: Some E1 signals are normal.
Some E1 signals are lost.
4.4.4 Block Diagram
Figure 4-7 shows the block diagram of the RTUA board.

Figure 4-7 RTUA Block Diagram
CPU control
module
Back
plane
MUX
Service interface
module
Service
signal
Clock
signal
Power
module
+12V
Data BUS
Control
BUS
16×E1
Control BUS
4.5 RTUB (8 x E1 + 1 x STM-1 + 1 x STM-1/4)
The RTUB board is system service board B used for the access of E1, STM-1, and
STM-4 services. It can be installed in slots 2 ~ 8. Its specific functions are as follows:
 Supports eight E1 interfaces
 Supports one STM-1 interface and one STM-1/4 interface
 Supports two channels of STM-1 point-to-point transparent transmission
 Supports the adding and dropping of 63 E1s on one STM-1
 Supports the adding and dropping of four STM-1s on one STM-4, with STM-
4 from the line side and STM-1 distributable to the radio side and line side.
 Supports SNCP protection
Figure 4-8 shows the RTUB board.

Figure 4-8 RTUB Board
ALM
RUN
E1
S2
TX1
RST
S1
RTUB
RX1 TX2 RX2
DB36
E1 CH1 – CH8
STM-1/4
STM-1
Table 4-8 describes the interfaces on the RTUB board.
Table 4-8 RTUB Interface Description
E1 CH1-CH8 DB36 Capacity: 8 x E1
STM-1 Tx1/Rx1 SFP LC Rate: 155.52 Mbps
STM-1/4
Tx2/Rx2
SFP LC Rate: 155.52 Mbps(STM-1)/622.080 Mbps (STM-4)
RST Button Reset button for RTUB
Table 4-9 describes the status of the LED indicators on the RTUB board.
Table 4-9 RTUB LED Indicator Description
RUN Green
Running status
indication
ON/OFF: faulty
ALM Red Alarm indication
OFF: no alarm
E1 Green
E1 link status
indication
ON: All the eight E1 signals are
normal.
OFF: All the eight E1 signals are lost.
Slow flashing: Some E1 signals are
normal and some E1 signals are lost.
S1 Green
First (Tx1/Rx1) STM-1
link status indication
ON: The link signal is normal.
OFF: The link signal is lost.
S2 Green
Second (Tx2/Rx2)
STM-1/4 link status
indication

4.5.4 Block Diagram
Figure 4-9 shows the block diagram of the RTUB board.
Figure 4-9 RTUB Block Diagram
CPU control
module
Back
plane
MUX
ADM
Service interface
module
Service
signal
Clock
signal
STM-1 /STM-4
STM-1
Power
module
+12V
Data BUS
Control
BUS
8×E1
Control BUS
Data
BUS
Data BUS
4.6 RTUMO (2 x GbE(O) / 4 x FE)
The RTUMO board is a system traffic board (optical module) for the access of FE and
GbE optical interface services. It can be installed in slots 2 ~ 8. Its specific functions are
as follows:
 RTUMO provides 2 x GbE (O) + 4 x FE interfaces
 GbE supports optical interface and FE supports electrical interface
 GbE interface supports synchronous Ethernet
Figure 4-10 shows the RTUMO board.

Figure 4-10 RTUMO board
ALM
RUN
RST
RTUMO
FE1 FE2 FE3 FE4
TX1
GbE1
RX1 TX2 RX2
GbE1 GbE2
GbE2
Table 4-10 describes the interfaces on the RTUMO board.
Table 4-10 RTUMO Interface Description
FE RJ-45
Wiring type: 10/100BaseT
Rate: 10/100Mbps self adaptive
GbE SFP LC
Wiring type: 1000Base-LX, 1000Base-SX
Rate: 1000 Mbps
RST Button Reset button for RTUMO
Table 4-11 describes the status of the LED indicators on the RTUMO board.
Table 4-11 RTUMO LED Indicator Description
RUN Green
Running status
indication
ON/OFF: faulty
OFF: no alarm
GbE1 Green
First GbE link status
indication
GbE2 Green
Second GbE link
status indication
4.6.4 Block Diagram
Figure 4-11 shows the block diagram of the RTUMO board.

Figure 4-11 RTUMO Block Diagram
CPU
Control
Module
Back
Plane
Switch
GbE
Interface
PHY
Service
Signal
Clock
Signal
Power
Module
+12V
Control
BUS
4×FE
Control
BUS
Clock
Process
2×GbE(O
)
2×GbE
Clock
Signal
Control
BUS
4.7 RTUME (2 x GbE(E) / 4 x FE)
The RTUME board is a system traffic board (electrical module) for the access of FE and
GbE electrical interface service. It can be installed in slots 2 ~ 8. Its specific functions
are as follows:
 RTUME provides 2 x GbE (E) + 4 x FE interfaces
 FE and GbE support electrical interface
 GbE interface support synchronous Ethernet
Figure 4-12 shows the RTUME board.
Figure 4-12 RTUME Board
ALM
RUN
RST
RTUME
GbE1 GbE2 FE1 FE2 FE3 FE4

Table 4-12 describes the interfaces on the RTUME board.
Table 4-12 RTUME Interface Description
FE RJ-45
10/100BaseT
Rate: 10/100Mbps self adaptive
GbE RJ-45
1000BaseT
Rate: 10/100/1000Mbps self adaptive
RST Button Reset button for RTUME
 Tip:
10/100BaseT and 1000BaseT use super CAT5 twisted pair cables.
Table 4-13 describes the status of the LED indicators on the RTUME board.
Table 4-13 RTUME LED Indicator Description
RUN Green
Running status
indication
ON/OFF: faulty
OFF: no alarm
4.7.4 Block Diagram
Figure 4-13 shows the block diagram of the RTUME board.

Figure 4-13 RTUME Block Diagram
CPU
Control
Module
Back
Plane
Switch
GbE
Interface
PHY
Service
Signal
Clock
Signal
Power
Module
+12V
Control
BUS
4×FE
Control
BUS
Clock
Process
2×GbE(E)
2*GE
Clock
Signal
Control
BUS
4.8 PM
The PM is a power board for IDU. It can be installed in slots slot 10 ~ 11. Its specific
functions are as follows:
 Uses -48 V DC power input and supplies 12 V and 3.3 V power for other others of
IDU
 Supports 300 W power output
 Supports under/over-voltage input and over-current protection
 Supports lightning and surge protection
 Supports 1+1 power protection
Figure 4-14 shows the PM board.

Figure 4-14 PM Board
Table 4-14 describes the interfaces on the PM board.
Table 4-14 PM Interface Description
-48VRTN
Hybrid type
connector
-48 V DC power input interface
OFF/ON Switch PM power switch
MON Mini-USB Reserved for engineering debugging
Table 4-15 describes the status of the LED indicators on the PM board.
Table 4-15 PM LED Indicator Description
RUN Green
Running status
indication
Fast flashing: restarting
ON/OFF: faulty
Fast flashing: critical alarm
Slow flashing: major alarm
ON: minor alarm
OFF: no alarm
PWR Blue Power indication
ON: normal
OFF: faulty

4.9 RPUA
The RPUA board is the power board for ODU. It can be installed in slot 12. Its specific
 Uses -48 V DC input, which is transferred to RMU through the backplane and to
ODU through IF interface to provide -48 V power for ODU
 Supports 210 W power output
 Supports under/over-voltage input and over-current protection
 Supports lightning and surge protection
 Supports 1+1 power protection
Figure 4-15 shows the RPUA board.
Figure 4-15 RPUA Board
Table 4-16 describes the interfaces on the RPUA board.
Table 4-16 RPUA Interface Description
PS1
2-core -48 V
power connector
-48 V DC power input interface
PS2
2-core -48 V
power connector
-48V DC power input interface
Table 4-17 describes the status of the LED indicators on the RPUA board.

Table 4-17 RPUA LED Indicator Description
PS1 Green
First -48 V power
input indication
Always ON: -48 V power input is
normal.
OFF: no -48 V power input
PS2 Green
Second -48 V power
input indication
Always ON: -48 V power input is
normal.
OFF: no -48 V power input.
4.10 RFAA
The RFAA board is the system fan control board. It can be installed in slot 9. Its specific
 Uses 12 V power input, driving six 5 W fans
 Supports temperature detection and fan speed monitoring
 Supports intelligent speed adaptation
Figure 4-16 RFAA Board

Table 4-18 describes the status of the LED indicators on the RFAA board.
Table 4-18 RFAA LED Indicator Description
RUN Green
Running status
indication
ON: Board is powered on and is not
under control.
Slow flashing: Fan is running and
under control.
OFF: Board is not powered on.
ON: faulty
OFF: no alarm

5 Network Management System
5.1 WEB LMT
WEB LMT is a local maintenance terminal for configuring and maintaining IDU as well as
the connected ODUs at local. It is embedded in NR8250 IDU and no additional software
installation is required. Users can connect a PC with the DEBUG port (or NMS port) of
RCUA through a network cable and visit the WEB LMT on the IE browser in the PC.
WEB LMT provides alarm management, configuration management, performance
management, maintenance management, security management, and language
management.
Fault Management
 Users can preview board status. The board status include normal (the LED
indicator is green), alarm (the LED indicator is red), and power-on (the LED
indicator is grey).
 Users can query history alarm, current alarms and event.
 IDU alarms include system alarms and slot alarms. The board type and alarm
indicator of the related slot is displayed on the alarm interface.
 Based on the priority level, alarms have four levels in a descending sequence:
critical, major, minor, and warning.
Configuration Management
Users can configure local NE, neighbor NE, board, clock, TDM & Ethernet service,
license, and system time.
 Local NE
Supports the query and configuration of local NE information and static routing
configuration. NE information includes NE ID, NE name, NE type, and NE IP
address.
 Adjacent NE
Supports the query of basic information about the adjacent NE, for example, NE ID,
NE name, NE type, NE IP address, and NE connection status.
 Board
Supports the configuration of board type and relation with slots, active/standby
relation of RMUB, and RTU function.
 Clock

 Supports the query of clock source and clock status of current equipment
 Supports the query of currently used clock source and available clock source
of each board
 Provides the configuration of clock resource for each board
 Radio link
Supports the configuration of working mode (such as capacity and modulation
scheme), protection parameter, ACM parameter, ATPC parameter and ODU
parameters.
 TDM & Ethernet service
 Supports the configuration of cross connect and SNCP for TDM service
 Supports the query and configuration of Ethernet service interface, inflow
and outflow speed limitation of broadcast package
 Supports the configuration of VLAN, QoS, and RSTP/STP.
 Supports the configuration of EOW, fan control mode, license, and system time.
Performance Management
Users can query the radio link performance statistical data, ODU, TDM, and Ethernet
traffic that is generated within 15 minutes and 24 hours. The data can be exported as an
EXCEL and WORD file.
Maintenance Management
WEB LMT provides the system reset function, version query, configuration file
management, ODU version management, SFP configuration, traffic loopback, and
power-down preprocessing.
Security Management
WEB LMT provides the functions such as user management, SNMP IP configuration,
Trap IP configuration, and SNMP community.

6 Technical Parameters
This chapter describes the related parameters.
6.1 Physical Parameters
6.1.1 Dimension and Weight
Table 6-1 shows the dimensions and weights of IDU and ODU.
Table 6-1 Dimension and Weight
Item Dimension (mm) Weight (kg)
IDU
90
(H)
482.6 (W)
482.6(W) x 90(H) x 199(D)
7 (six ways)
ODU (6 ~ 11GHz)
360 (W)
360
(D)
360 (W) x 360 (D) x 129 (H)
3.5
ODU (15 ~ 38GHz)
239 (W)
247
(D)
239 (W) x 247 (D) x 75 (H)
3.0

6.1.2 Power Voltage
Table 6-2 shows the power voltage parameters of the system.
Table 6-2 Power Voltage Parameters
Power
Module
Input Voltage Output Voltage Description
PM -48 V(-60 ~ -40 V) 12 V and 3.3 V
Supplies power for
boards of IDU
RPUA -48 V(-60 ~ -40 V) -48 V(-60 ~ -40 V)
Supplies power for
ODU
6.1.3 Temperature and Humidity
Table 6-3 Temperature and Humidity
Item
Working
Temperature
Guaranteed
Operation
Transportation/Storage
Temperature
Humidity
IDU -20°
C ~ 60°
C -20°
C ~ 55°
C -40°
C ~ 70°
C
<
95%(35°
C)
ODU -40°
C ~ 55°
C -33°
C ~ 50°
C -40°
C ~ 70°
C < 100%
6.1.4 Power Consumption
Overall Power Consumption
Table 6-4 lists the typical power consumption in various configuration modes.
Table 6-4 Typical Power Consumption
Mode Typical Configuration
Typical Power
Consumption
1 1xGbE +16E1, 1+0 Unprotected 74 W
2 1xGbE +16E1, 1+1 HSB 100 W
3 1xGbE+16xE1, 6x(1+0) Nodal Configuration 297 W
6.2 IDU Parameters
IDU parameters include channel spacing, modulation mode, system capacity, and
interface parameters.

6.2.1 Channel Bandwidth
7, 14, 28, 56 MHz
6.2.2 Modulation Mode
QPSK, 16QAM, 32QAM, 64QAM, 128QAM, and 256QAM
6.2.3 System Capacity
NR8250 supports mixture of TDM and Ethrrnet traffic with maximum of 4 x E1 ~ 2x STM-
1 TDM traffic and 10~400 Mbps Ethernet traffic.The actual capacity depends on the
modulation scheme and channel bandwidth, as shown in Table 6-5 .
 Tip:
The NR8250 supports TDM and Ethernet traffic cross connect. The maximum cross connect
capacity is 3200*3200E1 and 10 GB respectively.
Table 6-5 System Capacity (TDM and Ethernet)
Modulation Bandwidth TDM (Max) Ethernet (Max)
QPSK 7 MHz 4 x E1 9-11 Mbps
14 MHz 8 x E1 20-23 Mbps
28 MHz 16 x E1 43-50 Mbps
56 MHz 32 x E1 89-100 Mbps
16QAM 7 MHz 8 x E1 20-23 Mbps
14 MHz 16 x E1 36-42 Mbps
28 MHz 32 x E1 87-100 Mbps
56 MHz 1 x STM-1 180-208 Mbps
14 MHz 16 x E1 52-60 Mbps
28 MHz 32 x E1 107-123 Mbps
56 MHz 1 x STM-1 223-259 Mbps
14 MHz 16 x E1 59-68 Mbps
28 MHz 32 x E1 134-155 Mbps
56 MHz 1 x STM-1 276-320 Mbps
128QAM 7 MHz 16 x E1 33-39 Mbps
14 MHz 32 x E1 70-81 Mbps
28 MHz 1 x STM-1 158-183 Mbps

Modulation Bandwidth TDM (Max) Ethernet (Max)
56 MHz 2 x STM-1 322-373 Mbps
256QAM 7 MHz 16 x E1 39-45 Mbps
14 MHz 32 x E1 81-94 Mbps
28 MHz 1 x STM-1 182-210 Mbps
56 MHz 2 x STM-1 371-429 Mbps
6.2.4 Interface Parameters
NR8250 IDU supports 8 x E1, 16 x E1, STM-1, STM-4 as well as FE and GbE (optical
and electrical).
6.3 ODU Parameters
ODU parameters include frequency range, Tx/Rx spacing, IF signal, and interface
parameters.
6.3.1 Frequency Parameters
Frequency
The frequencies supported by NR8250 are 6, 7, 8, 8.5, 11, 15, 18, 23 and 38 GHz.
 Tip:
The frequency stability deviation is ±
5ppm (guarantee value: ±
10ppm).
Frequency Step
Frequency Step
6/7/8/8.5 GHz 50 kHz
11/15/18/23/38GHz 250 kHz
6.3.2 Tx/Rx Spacing
Table 6-6 shows the Tx/Rx spacing parameters.
Table 6-6 Tx/Rx Spacing Parameters
Frequency
Band
Frequency Range (GHz)
Tx/Rx Spacing (MHz)

Frequency
Band
Frequency Range (GHz)
Tx/Rx Spacing (MHz)
6 GHz 5.8-7.1 252.04
266
340
7 GHz 7.11-7.9 154
161
168
196
245
8/8.5 GHz 7.725-8.5 119
126
151.614
154
208
266
294.44
305.56
310
311.32
11 GHz 10.7-11.7 490
530
15 GHz 14.5-15.35 315
420
490
728
18 GHz 17.7-19.7 1010
1008
1560
23 GHz 21.2-23.6 1008
1200
1232
38 GHz 37.0-39.5 1260
6.3.3 Intermediate Frequency (IF) Signals
Table 6-7 lists the parameters of IF signals.
Table 6-7 IF Signal Parameters
Item IF Signal Transmission IF Signal Reception
Central
frequency
350 MHz 140 MHz
Modulation
frequency
5.5 MHz 10 MHz

Item IF Signal Transmission IF Signal Reception
Logic mode
Logic1: 0 MHz±
200 ppm
Logic0: 5.5 MHz±
200 ppm
Logic1: 0 MHz±
200 ppm
Logic0: 10 MHz±
200 ppm
Power range -26 dBm ~ +5 dBm -15 dBm ~ -8 dBm
The IF signal transmission direction is from IDU to ODU. The IF signal reception direction is from ODU to IDU.
6.3.4 Interface Parameters
Table 6-8 lists the parameters of ODU interface.
Table 6-8 Interface Parameters
Interface Type Resistance Return Loss
N-type 50Ω 12 dB
6.4 Power Parameters
6.4.1 Transmit Power
Maximum Transmit Power
The maximum transmit power is associated with power and modulation mode. Table 6-9
lists the specific values.
Table 6-9 Maximum Transmit Power
Frequency GHz 6 7 8 8.5 11 15 18 23 38
Maximum
transmit
power
(dBm)
QPSK 29 29 29 29 25 23 24 24 18
16QAM 26 26 26 26 21 20 20 20 14
32QAM 23 23 23 23 19 19 18 18 13
64QAM 21 21 21 21 17 17 15 15 10
128QAM 21 21 21 21 17 17 15 15 10
256QAM 20 20 20 20 16 16 14 14 9
 Tip:
Tolerance= ±
2dB.

Minimum Transmit Power
The minimum transmit power is associated with frequency. Table 6-10 lists the specific
values.
Table 6-10 Minimum Transmit Power
Frequency 6 7 8 8.5 11 15 18 23 38
Minimum
transmit
power
-1 -1 -1 -1 -5 -7 -6 -6 -7
ATPC Range
The system supports Automatic Transmit Power Control (ATPC), which means that
system transmit power is automatically adjustable in a certain range. Table 6-11 shows
the ATPC range.
Table 6-11 ATPC Range
Frequency GHz 6 7 8 8.5 11 15 18 23 38
ATPC
Range
(dB)
QPSK 30 30 30 30 30 30 30 30 25
16QAM 27 27 27 27 26 27 26 26 21
32QAM 24 24 24 24 24 26 24 24 20
64QAM 22 22 22 22 22 24 21 21 17
128QAM 22 22 22 22 22 24 21 21 17
256QAM 21 21 21 21 21 23 20 20 16
6.4.2 Receive Power
The receive power threshold is associated with frequency, modulation scheme, and
channel bandwidth. Table 6-12 lists the specific values.
Table 6-12 Threshold of Receive Power
Frequency
Modulation
Scheme
7MHz 14MHz 28MHz 56MHz
6/7/8/8.5GHz
QPSK -90 -87 -84 -81
16QAM -83 -80 -77 -74
32QAM -81.5 -78.5 -75.5 -72.5
64QAM -79 -75 -72 -70
128QAM -75.5 -72.5 -69.5 -66.5
256QAM -72 -69 -66 -63
11/15GHz QPSK -89 -86 -83 -80

Frequency
Modulation
Scheme
7MHz 14MHz 28MHz 56MHz
16QAM -82 -79 -76 -73
32QAM -80.5 -77.5 -74.5 -71.5
64QAM -78 -74 -71 -69
128QAM -74.5 -71.5 -68.5 -66.5
256QAM -71 -68 -65 -62
18/23GHz
QPSK -89.5 -86.5 -83.5 -80.5
16QAM -82.5 -79.5 -76.5 -73.5
32QAM -81 -78 -75 -72
64QAM -78 -74 -71 -69
128QAM -75 -72 -69 -66
256QAM -71.5 -68.5 -65.5 -62.5
38GHz
QPSK -87.5 -84.5 -81.5 -78.5
16QAM -80.5 -77.5 -74.5 -71.5
32QAM -79 -76 -73 -70
64QAM -76 -72 -69 -67
128QAM -73 -70 -67 -64
256QAM -69.5 -66.5 -63.5 -60.5
 Tip:
Tolerance=2.0dB, BER=10-6
.
6.5 Reliability Parameters
6.5.1 Standard Compliance
Table 6-13 shows the standards that NR8250 complies with.
Table 6-13 Complied Standards
Item Specifications
EMC Conforms to the requirements of EN 301 489-4
Security Conforms to the requirements of IEC 60950
Operation Conforms to the requirements of ETSI 300 019-1-3
Storage Conforms to the requirements of ETSI 300 019-1-3
Transportation Conforms to the requirements of ETSI 300 019-1-2

6.5.2 Fault Tolerance Parameters
Fault tolerance parameters include Bit Error Rate (BER) and Mean Time Between
Failures (MTBF).
 When RSL=-30dBm, BER<10-12
 MTBF>200,000 hours
6.5.3 RSSI Parameters
Received Signal Strength Indication (RSSI) indicates the received signal strength, the
value ranges from -20 ~ -90 dBm. This represents the RSSI monitoring in ODU and its
respective voltage from 0.5 V ~ 4 V.
Figure 6-1 shows the relation between receiving voltage and RSSI.
Figure 6-1 RSSI Parameters
6.5.4 Anti-Continuous-Wave Interference Parameters
Table 6-14 lists the anti-continuous-wave interference values at different channel
spacing and frequency range.
Table 6-14 Anti-Continuous-Wave Interference Parameters
Channel
Bandwidth
Frequency Range Anti-Continuous-Wave Interference Index
7 M Rx f0±
14MHz ≥ 5 dB

Channel
Bandwidth
Frequency Range Anti-Continuous-Wave Interference Index
Rx f0±
17.5MHz ≥ 13 dB
14 M
Rx f0±
28MHz ≥ 7 dB
Rx f0±
35MHz ≥ 16 dB
28 M
Rx f0±
28MHz ≥ 7 dB
Rx f0±
56MHz ≥ 18 dB
Rx f0±
70MHz ≥ 30 dB
56 M
Rx f0±
56MHz ≥ 9 dB
Rx f0±
112MHz ≥ 30 dB
Rx f0±
140MHz ≥ 30 dB
 Tip:
Rx f0 is the central frequency of receiving. If Rx f0 is 140 MHz, Rx f0±
14MHz indicates that
the frequency range is [126 MHz, 154MHz].

7 Network Configuration
NR8250 supports point-to-point, link, tree, and ring networking configurations, as shown
in Table 7-1 .
Table 7-1 NR8250 Network Configurations
Protection Mode Networking Type Network Configuration
Unprotected 1+0
1+0, 2 x (1+0), 3 x (1+0), 4 x (1+0), 5 x
(1+0), 6 x (1+0)
Hot standby
1+1 HSB 1+1 HSB, 2 x (1+1 HSB), 3 x (1+1 HSB)
1+1 SD 1+1 SD, 2 x (1+1 SD), 3 x (1+1 SD)
1+1 FD 1+1 FD, 2 x (1+1 FD), 3 x (1+1 FD)
Ring network
protection
Ring network SNCP, RSTP
Nodal protection Nodal networking
2 x (1+0) + 2 x (1+1 HSB)
2 x (1+0) + 2 x (1+1 SD)
2 x (1+0) + 2 x(1+1 FD)
4 x (1+0) + (1+1 HSB)
4 x (1+0) + (1+1 SD)
4 x (1+0) + (1+1 FD)
7.1 N x (1+0) Network Configuration
NR8250 supports 1+0, 2 x (1+0), 3 x (1+0), 4 x (1+0), 5 x (1+0), and 6 x (1+0)
networking configuration.
7.1.1 Configuration Requirements (Single Site)
In N x (1+0) network configuration, the configuration of a single site is as shown in Table
7-2 .
Table 7-2 N x (1+0) Network Configuration
Compo
nents
Configuration Requirements
1+0 2 x (1+0) 3 x (1+0) 4 x (1+0) 5 x (1+0) 6 x (1+0)
RMU 1 PCS 2 PCS 3 PCS 4 PCS 5 PCS 6 PCS
ODU 1 PCS 2 PCS 3 PCS 4 PCS 5 PCS 6 PCS
Antenna 1 PCS 2 PCS 3 PCS 4 PCS 5 PCS 6 PCS
IF cable 1 PCS 2 PCS 3 PCS 4 PCS 5 PCS 6 PCS

7.1.2 Configuration Diagram
Figure 7-1 shows the diagram of 1+0 configuration.
Figure 7-1 1+0 Networking Configuration
7.1.3 Configuration Principle
Figure 7-2 shows the principle of 1+0 configuration.
Figure 7-2 1+0 Configuration Principle
RTU ODU
RMU
RCU
RMU
RTU RCU Decoding ODU
Antenna
Antenna
Site A
Site B
Protection
Protection
Coding
7.2 N x (1+1 HSB) Configuration
1+1 Hot Standby (HSB) is 1+1 hot standby protection. NR8250 supports 1+1 HSB, 2 x
(1+1 HSB) and 3 x (1+1 HSB).
During 1+1 HSB configuration, main ODU and standby ODU are installed at the same
antenna to provide equipment hot standby protection
In N x (1+1 HSB) configuration mode, the configuration of a single site is as shown in
Table 7-3 .

Table 7-3 1+1 HSB Configuration
Components
Configuration Requirements)(PCS)
1+1 HSB 2 x (1+1 HSB) 3 x (1+1 HSB)
RMU 2 4 6
ODU 2 4 6
Antenna 1 2 3
IF cable 2 4 6
Combiner 1 2 3
Figure 7-3 shows the diagram of 1+1 HSB configuration.
Figure 7-3 1+1 HSB Configuration
Figure 7-4 shows the principle of 1+1 HSB configuration.

Figure 7-4 1+1 HSB Configuration Principle
RTU
ODU
RMU
RCU
Protection
Coding
RMU
RTU RCU
Protection Decoding ODU
Antenna
Site A
Site B
ODU
RMU
Protection
Coding
Antenna
Hybrid
RMU
Hybrid
Active Link Standby Link
7.2.4 Switchover Principle
In 1+1 HSB mode, the protection modules of two RMU modules are connected in
cascading mode.
Normal Operation Status
 Transmitter: Only main ODU transmits signal while standby ODU on Mute mode.
 Receiver: Both main and standby are receiving, main path IF module will select the
better signal.
Swtichover at Transmit End
 Transmitter:
 If ODU fails: Main ODU will be on Mute mode while standby ODU transmits
signal
 If RMU fails: Standby RMU performs signal modulation and ODU signal
transmission while main ODU remains on Mute mode.
 Receiver: Main and standby remain unchanged
Switchover at Receive End
 Transmitter: Main and standby remain unchanged.
 Receiver: Main RMU will select optimum signal automatically.

 Tip:
Based on the switchover priority level, switchover conditions in a descending order are
forced switchover, RMU or ODU hardware faults, and alarms on RMU or ODU.
7.3 N x (1+1 SD) Configuration
1+1 Space Diversity (SD) is 1+1 space diversity hot standby protection. NR8250
supports 1+1 SD, 2 x (1+1 SD) and 3 x (1+1 SD).
In the 1+1 SD protection mode, the active ODU and standby ODU are installed on
different antennas. This enables the system to receive signals from different radio links
at the same time, providing full-time hot backup protection for the equipment.
In N x (1+1 SD) configuration mode, the configuration of a single site is as shown in
Table 7-4.
Table 7-4 1+1 SD Configuration
Components
Configuration Requirements(PCS)
1+1 HSB/SD 2 x (1+1 HSB/SD) 3 x (1+1 HSB/SD)
RMU 2 4 6
ODU 2 4 6
Antenna 2 4 6
IF cable 2 4 6
Figure 7-5 shows the diagram of 1+1 SD configuration.

Figure 7-5 1+1 SD Configuration
Figure 7-4 shows the principle of 1+1 SD configuration.
Figure 7-6 1+1 SD Configuration Principle
RTU
ODU
RMU
RCU
Protection
Coding
RTU RCU
Antenna
Site A
Site B
ODU
RMU
Protection
Coding
Antenna
S1 Link S2 Link
Antenna
RMU
RMU
Antenna
S1
S2
Traffic is transmitted from site A to site B. The S1 and S2 in the figure are used to
differentiate different antenna locations.
In 1+1 SD mode, the protection modules of two RMU modules are connected in
cascading mode.

 Transmitter: Only main ODU transmits signal while standby ODU on Mute mode.
 Receiver: Both main and standby are receiving, and the main path IF module will
select the better signal.
Swtichover at Transmitter
 Transmitter:
 If ODU fails: Main ODU will be on Mute mode while standby ODU transmits
signal.
 If RMU fails: Standby RMU performs signal modulation and ODU signal
transmission while main ODU remains on Mute mode.
 Receiver: Main and standby remain unchanged.
Switchover at Receiver
 Transmitter: Main and standby remain unchanged.
 Receiver: Main RMU will select optimum signal automatically.
 Tip:
forced handover, RMU or ODU hardware faults, and alarms on RMU or ODU.
7.4 N x (1+1 FD) Configuration
1+1 Frequency Diversity (FD) provides frequency diversity hot standby protection.
NR8250 supports 1+1 FD, 2 x (1+1 FD), and 3 x (1+1 FD).
In 1+1 FD protection mode, service can be sent and received through two different
frequency points on the same link, which provides full-time hot standby protection for the
equipment. This mode reduces link attenuation caused by multi-path reflection and
improves link stability.
In N x (1+1 FD) configuration, the configuration of a single site is as shown in Table 7-5
Table 7-5 1+1 FD Configuration
Components
1+1 FD 2 x (1+1 FD) 3 x (1+1 FD)

Components
1+1 FD 2 x (1+1 FD) 3 x (1+1 FD)
RMU 2 4 6
ODU 2 4 6
Antenna 1 2 3
IF cable 2 4 6
Combiner 1 2 3
Figure 7-7 shows the diagram of 1+1 FD configuration.
Figure 7-7 1+1 FD Configuration Diagram
Figure 7-8 shows the principle of 1+1 FD configuration.

Figure 7-8 1+1 FD Configuration Diagram
RTU
ODU
RMU
RCU
Protection
Coding
RMU
RTU RCU
Antenna
Site A
Site B
ODU
RMU
Protection
Coding
Antenna
Hybrid
RMU
Hybrid
F1 Link F2 Link
F1 F2
Traffic is transmitted from site A to site B. The F1 and FS2 in the figure are used to
differentiate different frequencies.
In 1+1 FD mode, the protection modules of the two RMU modules are connected in
cascading mode.
 Transmitter: ODUs on active and standby links send signals with different
frequencies.
 Receiver: The active and standby RMUs receive two ways of signals and select the
optimal one as the active signal.
Switchover at Transmitter
 Transmitter: ODUs on active and standby links send signals with different
frequencies.
 Receive end: The active/standby state remains unchanged.
Switchover at Receiver End
 Transmitter: Active/standby state remains unchanged.
 Receiver: RMU selects the signal with optimal quality.

 Tip:
forced switchover, RMU or ODU hardware faults, and alarms on RMU or ODU.
7.5 SNCP Ring Networking
NR8250 supports Sub Network Connection Protection (SNCP). In SNCP configuration, a
special protection route is arranged in advance for a certain subnet connection. Once
the subnet fails, the special protection route takes place of the subnet and transmits
services for the whole network. SNCP ring network can protect the services transmitted
on the microwave link.
 Tip:
SNCP can be configured only in transparent transmission mode.
The configuration of a single site is as shown in Table 7-6 .
Table 7-6 SNCP Configuration
Components Configuration Requirements(PCS)
RMU 2
ODU 2
Antenna 2
IF cable 2
7.5.2 Networking Diagram
Figure 7-9 shows the diagram of SNCP networking.

Figure 7-9 SNCP Networking Diagram
7.5.3 Networking Principle
Figure 7-10 shows the principle of SNCP networking.
Figure 7-10 SNCP Networking Principle
Protection SNC
Working SNC
SNC Source SNC End
Node A Node B
Subnet 2
Subnet 1
Working
Source
Protection
Source
Detailed description of the SNCP networking is as follows:
 The protection path at each transmission direction uses different routes with the
working path (only one signal direction is marked in the figure).
 Node A and Node B exchange services through SNCP. That is, Node A transfers
services in bridge mode to Node B through subnet 1 (working SNC) and subnet 2
(protection SNC) respectively.

 Node B selects the service information from one route by using a changeover
switch based on the changeover principle.
 SNCP adopts the working mode of two-route transmission and selective reception.
7.6 RSTP Ring Networking
NR8250 supports Rapid Spanning Tree Protocol (RSTP) ring protection, which protects
services through ring network.
When RSTP ring network is used, the configuration of a single end is as shown in Table
7-7 .
Table 7-7 SNCP Configuration
RMU 2
ODU 2
Antenna 2
IF cable 2
Figure 7-11 shows the diagram of RSTP networking.

Figure 7-11 RSTP Networking Diagram
Figure 7-12 shows the principle of RSTP networking.
Figure 7-12 1+1 RSTP Networking Principle
Site A
Site B
Site C
Site D
Block
Service A Service A
 Generally, the link between site B and site D is blocked and no service is
transmitted. In this case, the transmission path of service A is site A-C-D.
 If either the link between site A and site C or the link between site C and site D fails,
the link between site B and site D is unblocked. In this case the transmission path
of service A is site A-B-D.

7.7 Nodal Networking
NR8250 supports the hybrid configuration of 1+0/1+1 HSB, SD, and FD and supports
six directions at most. This networking mode is called Nodal networking.
 Tip:
The following is about 2 x (1+0) + 2 x (1+1 HSB) Nodal networking.
In 2 x (1+0) + 2 x (1+1 HSB) networking mode, the configuration of a single end is as
shown in Table 7-8 .
Table 7-8 2 x (1+0) + 2 x (1+1 HSB) Networking
RMU 6
ODU 6
Antenna 4
IF cable 6
Figure 7-13 shows the diagram of Nodal networking.
Figure 7-13 2 x (1+0) + 2 x (1+1 HSB) Networking Diagram

 Tip:
For 1+0 configuration, refer to “7.1.3 Configuration Principle”. For 1+1 HSB configuration,
refer to “7.2.3 Configuration Principle”.

8 Abbreviations
Abbreviation Full Name
A
ALM Alarm
B
BER Bit Error Rate
D
DEM Demodulator
DEMUX Demultiplexer
DSCP Differentiated Services Code Point
E
EMC Electro Magnetic Compatibility
EOW Engineering Order Wire
ETSI European Telecommunications Standards Institute
F
FD Frequency Diversity
FTP File Transfer Protocol
H
HSB Hot Standby
I
IEC International Electro technical Commission
IDU Indoor Unit
IF Intermediate Frequency
ITU International Telecommunication Union
ITU-R Radio standardization sector of ITU
ITU-T Telecommunication standardization sector of ITU
M
MDI/MDI-X
Media Dependent Interface/ Medium Dependent Interface Cross-
over
MTBF Mean Time Between Failure
MUX Multiplexing
N
NE Network Element
NMS Network Management System
O
ODU Outdoor Unit
P
PM Power Module

Abbreviation Full Name
Q
QAM Quadrature Amplitude Modulation
QoS Quality of Service
QPSK Quadrature Phase Shift Keying
R
RCU Radio Core Unit
RF Radio Frequency
RFA Radio Fan Asset
RMU Radio Modem Unit
RPU Radio Power Unit
RSTP Rapid Spanning Tree Protocol
RSSI Received Signal Strength Indication
RTU Radio Traffic Unit
Rx Receiver
S
SD Space Diversity
SFP Small Form-factor Pluggable transceiver
SNCP SubNetwork Connection Protection
SNMP Simple Network Management Protocol
STP Spanning Tree Protocol
T
TDM Time-Division Multiplexing
Tx Transmitter
V
VLAN Virtual Local Area Network

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