5.1 AND1EM4T - 4 Channels GE/FE Electrical Interface
Board
This section describes the AND1EM4T (a 4 channels GE/FE electrical interface board), in terms
of version, function, principle, front panel, and technical specifications.
5.1.1 Overview
The AND1EM4T (EM4T for short) is a four channels FE/GE adaptive electrical interface board.
The function version of the EM4T is AND1. The AND1EM4T is housed in any of slots 1 to 4.
5.1.2 Functions and Features
The AND1EM4T mainly accesses 4 x FE/GE electrical signals, and processes the services with
the AND1CXPA/AND1CXPB.
Table 5-1 lists the functions and features of the AND1EM4T.
Table 5-1 Functions and features of the AND1EM4T
Function and Feature
Description
Basic function Supports four FE/GE electrical interfaces.
Accesses 8 x FE/GE electrical signals, and processes the
services with the AND1CXPA/AND1CXPB.
Supports the hot swappable function.
Detects the temperature and voltage of the board.
Interface function Supports PHY-layer inloop.
Supports MAC-layer outloop.
Supports automatic loopback release at the port.
Clock Supports synchronous Ethernet.
Supports SSM protocol.
Supports IEEE 1588V2 protocol.
Supports 1588 ACR clock.
5.1.3 Working Principle and Signal Flow
The AND1EM4T mainly consists of the service access module, service processing module,
management module, clock module, and power supply module
Figure 5-1 shows the block diagram for the functions of the AND1EM4T.
ATN 950B Multi-service Access Equipment
Hardware Description 5 Physical Interface Card
Issue 03 (2012-07-23) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
36
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