LE-20N - Module for the LANNET LET-36 (Historical documentation)

1. MODULAR, MULTI-MEDIA NETWORKING
LE-20N
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Madge Networks
DUAL PORT, DUAL LAN FIBER-OPTIC
SYNCHRONOUS ETHERNET MODULE
FEATURES
s Modularity
Plug-in two port fiber-optic Ethernet module for use
with MultiNet™
modular active star enclosures
s Multiple LANs
Simultaneously connects two Ethernet segments in
MultiNet hubs for cost efficient connectivity
s Adaptability
Each port can be connected to a different
Ethernet LAN
s Standalone Mode
Independent operation as light regenerator
s Interface
Implements state-of-the-art IEEE802.3
1OBASE-FB synchronous Ethernet signaling
s Port Redundancy
Port redundancy with automatic switchover provides
fault tolerant links.
s LAN Redundancy
Protection against bus failure by automatic
switchover to backup LAN
s Management
Fully manageable under MultiMan™
- LANNET’s
SNMP based management system
s Extensive Diagnostics
LED indicators provide module, port status and
configuration information
s Topological Flexibility
Provides numerous layers of hierarchical hub
cascading and network diameter up to 4 km
DESCRIPTION
The LE-2ON is a dual pod, dual bus fiber-optic Ethernet
plug-in module for use with MultiNet modular active star
enclosures. MultiNet hubs can be fully populated with
fiber modules providing high density fiber
interconnection. Each port link can connect via a duplex
fiber optic cable to other MultiNet fiber optic equipment.
The LE-20N module can be used in the multiple LAN
environment of the MultiNet hubs to provide reliable
parallel LAN backbone links or connectivity to the user.
Three modes of operation are available. In the Normal
Mode, both ports connect to one of the two internal
Ethernet busses. In this mode port and LAN redundancy
can be activated providing fault tolerant design
capabilities. In the Backbone Mode each port is
connected to a different LAN allowing cost effective
linking of multiple segments. Standalone Mode allows
the extension of fiber links without connecting to the
bus.
The LE-20N is manageable by MultiMan, LANNET’s
Network Management System. This provides extensive
control, monitoring and administration of the module
from the - remote management console. MultiMan offers
performance and event reporting and analysis of the
LE-20N through the network management SNMP agent.
Using the management control or via a DIP switch, the
ports can be placed in redundancy mode.
LET-36

2. s Indicators
LAN Connection LEDs:
on – LAN connected
blinking – Redundant LAN
both on - Backbone mode
both off - Standalone mode
Auto/Manual LED:
on - Management control active
Port Redundancy LED:
on – Redundancy enabled, port 1 active
blinking – Redundancy enabled, port 2 active
Port LED:
on – Normal link operation
1 blink – No light is received in input (Rx) fiber
2 blinks – Local Jabber or Port Partition
3 blinks – Malfunction in output (Tx) fiber
(Remote Fault)
5 blinks - Undefined input sequence
off – Port disabled
s Environmental
Operating Temperature:0° to 40° (32°F to 104°F)
Humidity: 5% to 95% non-condensing
Radiation Suppression: Per FCC part 15,subpart J,
class A
s Mechanical
Panel width: 4 HP (20 mm). One slot in modular hub
Size: 120 mm (4.72") X 247 mm (9.72")
Weight: 0.2 kg (0.44 Ib)
s Power Consumption
1.0 Amps at 5VDC
ORDERING
831027 LE-20N Fiber-Optic Module (ST connectors)
In this mode if the active port/link fails, communications
are automatically transferred to the backup port. When
redundancy has not been selected, the two ports
function independently. The LAN redundancy option
provides an automatic switchover from the selected
internal Ethernet segment to the standby segment in the
case of bus failure. The extensive diagnostic information
available on the module and enclosure ensures minimal
diagnostic/repair cycles and network downtime.
The LE-20N uses synchronous link signaling, thus
avoiding the need for repeaters and allowing for multi-
level network configurations. Large area coverage and
flexible network expansion are supported by gradually
adding LE-20N modules. This allows an all fiber Ethernet
to extend to diameters of over 4 km (2.5 miles).
The LE-20N ensures 100% error free collision detection
and enforcement. Jabber protection on each port allows
automatic disconnection of malfunctioning nodes.
Dual LAN Fiber Backbone and Links
Madge, the Madge logo, LANNET, MultiNet, MultiMan, LANswitch, LANstack,VirtualMaster,VirtuaLAN, DecodeMaster, InterMaster, RMONMaster, SMONMaster, SecureMaster, TerrainMaster and Cellenium aretrademarks,
and insome jurisdictions may be registered trademarks of Madge Networks or its affiliated companies. Other trademarks appearing inthis document are the property of their respective owners.
Data is subject to change without notice
© Copyright 1995 Madge Networks. All Rights Reserved. DS-
Madge Networks N.V. acquired LANNET Data Communications
Ltd. on November 28, 1995.
103031-Rev.C
SPECIFICATIONS
s Optical Parameters
Transmit:
Source: Ga-Al-As High radiance LED (820±20nm)
Mean power coupled into fiber:
High Low Fiber Type N.A.
-8.5±2dBm -13.0±2dBm 100/140µ 0.29
-10.5±2dBm -14.0±2dBm 85/125µ 0.26
-12.0±2dBm -16.5±2dBm 62.5/125µ 0.28
-16.0±2dBm -21.0±2dBm 50/125µ 0.20
Receive:
Detector: Silicon PIN photodiode
Sensitivity: Mean Optical Power Input for
BER<10-10 32.5dBm (0.56µW) or less
Saturation: Mean Optical Power Input of -15 dBm
(32µW) or more
Dynamic Range: 17.5dB
Connectors: ST
s Maximum Preamble Bits Consumed
Fiber port to fiber/twisted pair port - 0 bits
s Maximum Jitter
Fiber port to fiber/twisted pair port - 0 nsec
s Throughput Delay
Fiber to sync bus - 7 bits maximum
Sync bus to fiber - 2 bits maximum
s Signalling
10MHz +/-0.01% Manchester encoding for data
Manchester code violations for control and
diagnostics. Idle signal, 2.5MHz. Remote Fault
signal, 1.6Mhz
s Jabber Protection
8.2 msec.
s Controls
AUTO/MANUAL management mode, individual port
enable, port redundancy, LAN select, LAN redundancy
and normal/ plus mode are selectable via the on
board DIP switches or via the management console
Four jumpers are for High/Low power transmission
s Auto-Partitioning of Ports
After 31 consecutive collisions or a collision that lasts
longer than 2048 bits. Automatic reconnection after
receiving a packet of at least 512 bits with no collisions