This document provides information about ZTE's iTC (Integrated Transcoder Concentrator) system. It describes the purposes and benefits of applying the iTC in networks, including saving transmission resources, sharing transcoder resources, improving utilization of TCU resources, and providing disaster recovery through flexible Ater/A interfaces. It also outlines the hardware structure and shelf configurations of the ZXG10 iTC system and provides examples of system configurations using E1 and STM-1 interfaces on the Ater and A interfaces.

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Welcome to ZTE University

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iTC Overview

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iTC Service Networking

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Purposes of applying iTC in the network are:
 Save Transmission resources
 Share Transcoder resources among iBSCs
 Improve the utilization rate of TCU
resources
 Flex Ater/A interfaces provide disaster
recovery.

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Interface Indices
A-interface uses the following media:
1. E1-link - 256-1 / 768-2 / 1024-3 / 1536-4
2. STM1-link – 4-1 /12-2 / 16-3 /24
A-ter interface uses the following media:
1. E1-link – 64 -1 / 192-2 / 256-3 / 384 - 4
2. STM1-link – 1-1 / 3-2 / 4 - 3 / 6-4

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ZXG10 iTC System Composition

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Hardware Structure of ZXG10 iTC

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iTC Shelves Description

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iTC Shelf Configurations
 Control Shelf is configured in the second shelf of
the third cabinet if needed. For one or two Cabinet iTC
configurations, control shelf’s boards are distributed
in other shelves.
 Packet Switching Shelf and Circuit Switching Shelf should
be configured in the fourth and first shelves respectively.

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Connection Description
Clock Distribution of Combined Cabinet

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Ethernet Connections of Combined Cabinets

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User Plane connections of combined cabinet (GLI)

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User Plane connections of combined cabinet (TFI)

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iTC External Connections

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Structure of Resource Shelf

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Structure of Circuit Switching Shelf

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Structure of Packet Switching Shelf

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Structure of Control Shelf

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External Interfaces

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Clock Distribution

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User Plane Signaling flow

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Control Plane Signaling flow

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Service Networking
A-ter Interface Networking A-interface Networking

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Maintenance System Networking

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Configuration principles
System configuration principles for Ater interface
TDM access modes are:
 iTC supports 1 to 4 Rack configurations
 One SPB supports 128 no.7 Signaling. There are 2
SPB boards that can process 256 no.7 signaling.
 Resource shelf = AIU + TCU + Ater
2 Resource shelves = one PRCBU
System capacity expansion is very easy, only needs
to stack PRCBU

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Contd..
 For Full rate Ater GUP can process 3360 voice
channels.
 For Half rate, Ater GUP can process 4200 voice
channels.
 Normally average value supported by Ater Gup is
3600 voice channels.
 TC GUP supports 840 Traffic channels (14 DSP x
60)
 Multiplexing ratio for cabling E1 or STM-1
Interface at Ater-interface is 1:4 for FR; 1:8 for
HR.

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iTC System Configuration (Ater Interface
TDM)

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Example to calculate no. of boards required in
One PRCBU
1 PRCBU = 2 shelves
To support 1024 Trx,
At A-interface, 256 E1 required ie 8 DTB
At A-ter, 64 E1 required ie. 2 DTB
Total= 10 DTB.
One TC GUP supports, 840 TCs
For 1024 TRX, 8192 TCs ie 10 GUPs
At Ater- 8192/4 =2048 TCs=3 GUPs
Total =13 GUPs.

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Detailed System Configuration.
 iTC can have a maximum of 4 Racks in
various configurations according to
different situations such as Ater uses E1 or
STM-1 and A-interface uses E1 or STM-1.
Integrated T-Network and Integrated IP
switch are mutually inclusive in iTC
configuration ie either use both or none

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Detailed System Configuration
Dual Shelf iTC Stack Configuration

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Single Rack Configuration (A/Ater uses E1)

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Dual Rack configuration( Ater/A-interface uses E1 )