Application Context
As shown in Figure 14-4, the OLT receives the clock from the upstream synchronous Ethernet
port. (This clock is transmitted through the PSN network and must be supported by all
intermediate nodes.) Then the clock is transmitted to the ONU through the PON line clock. After
recovering the clock, the ONU transmits the clock to the base station through the synchronous
Ethernet or independent clock port.
Figure 14-4 Ethernet clock synchronization
PSN
N*E1
BTS
OLT
BSC
NodeB/
eNodeB
N*E1
ONU
RNC
CX600
GE/10GE
Synchronization Ethernet line clock
GPON line clock
FE/GE
GE
E1/STM-1 line clock
ONU
Prerequisite
l The clock daughter board CKMC/CKMD of the SCU board must be in position.
l The ethernet upstream board must be GICK/GSCA (GE port) or X2CS (10GE port)/SPUF
(need an independent service board slot).
l The upstream MAN PSN of the OLT must feature the capability of Ethernet
synchronization.
Data Plan
Item Data
GIU Upstream
Boards
Port: 0/19/0
E1 port of the ONU 0/1/0
ETH port of the
ONU
0/3/1
Configuration Concept
1. The OLT uses the synchronous Ethernet clock of the upstream slot as the system clock.
2. The system clock is issued to the ONU through the optical path of the PON service board.
3. The ONU uses the line clock of the PON upstream port as the system clock.
SmartAX MA5600T/MA5603T/MA5608T Multi-service
Access Module
Commissioning and Configuration Guide
14 FTTM Configuration (Base Station Access)
Issue 01 (2014-04-30) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
1387
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