5.3.1 Overview
The AND1EM4F (EM4F for short) is a four channels FE/GE optical interface board. The
function version of the EM4F is AND1. The AND1EM4F is housed in any of slots 1 to 4.
5.3.2 Functions and Features
The AND1EM4F mainly accesses 4 x FE/GE optical signals, and processes the services with
the AND1CXPA/AND1CXPB.
Table 5-9 lists the functions and features of the AND1EM4F.
Table 5-9 Functions and features of the AND1EM4F
Basic function Description
Basic function Supports four FE/GE optical interfaces, on which FE optical
modules and GE optical modules can be mixedly used. Accesses
4 x FE/GE optical 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 and outloop.
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.
5.3.3 Working Principle and Signal Flow
The AND1EM4F mainly consists of the service access module, service processing module,
management module, clock module, and power supply module.
Figure 5-5 shows the block diagram for the functions of the AND1EM4F.
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.
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