Code : HDB3
Looptype : -
Timeslot : -
Clock : system
CRC4 : -
Signaling : -
ESF : -
Impedance : 120 Ohm
---------------------------------------
3. Query the configuration and status of the system clock source.
Run the display clock source command to query the configuration and status of the system
clock source.
huawei(config-if-tdm-0/1)#quit
huawei(config)#display clock source
--------------------------------------------------------------------
Index Type Source State Priority QL Selected
--------------------------------------------------------------------
0 line 0/0/1 Normal 0 --- YES
1 -- -/ -/ - --- --- NO ---
2 -- -/ -/ - --- --- NO ---
3 -- -/ -/ - --- --- NO ---
4 -- -/ -/ - --- --- NO ---
5 -- -/ -/ - --- --- NO ---
6 -- -/ -/ - --- --- NO ---
7 -- -/ -/ - --- --- NO ---
8 -- -/ -/ - --- --- NO ---
9 -- -/ -/ - --- --- NO ---
--------------------------------------------------------------------
----End
Result
After the configuration of base station access service is complete, use the test meter to perform
tests on the E1/ETH access port of the ONU and the upstream GE/10GE port. The long-term bit
error ratio (BER) and delay should be able to meet the requirements for actual applications.
14.3.5 Configuring "1PPS+ToD" Clock Synchronization
In the base stations that require time synchronization, such as CDMA2000/TD-SCDMA/LTE,
the OLT obtaions time by "1PPS+ToD" time injection way. The OLT transmits the clocks to
the ONU through GPON lines and then downstream to the base station, implementing clock
synchronization of the entire network.
Context
"1PPS+ToD" is a time synchronization technology. The quality of clock transmitted by "1PPS
+ToD" meets the stratum 3 clock requirement and the time quality reaches a submicrosecond
precision, which solves the time and clock synchronization problems of the user. In addition,
using "1PPS+ToD" can better reduce user's investment. Therefore, it is applicable to the base
station access services.
Application Context
As shown in Figure 14-5, the OLT is injected with time through the 1PPS+ToD interface (the
time source is obtained from the GPS). Then, the OLT transmits the time signals to the ONU by
means of the GPON time synchronization technology. After recovering the time signals, the
ONU transmits them to the base station by means of the time interface.
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.
1389
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