Configuring Clock Synchronization
In this scenario, the E1/STM-1 line clock can be used to achieve network-wide clock synchronization.
Prerequisites
The clock daughter board CKMC/CKMD must be on the SCU main control board.
Context
Configuration roadmap for clock synchronization:
1.The OLT traces the upstream E1/STM-1 line clock of the TOPA board as the system clock.
2.The system clock is delivered to an ONU through optical paths of the GPON board.
3.The ONU uses the line clock of the GPON upstream port as the system clock.
4.The ONU E1 transmit clock is synchronized with the system clock of the ONU.
Procedure
Configure a clock on the OLT.
Add a system clock source.
Run the clock source command to configure the line clock of E1/STM-1 port 0/5/0 on the TOPA board as the system clock source. Set the ID of the clock source to 0.
The clock module automatically judges the type of the specified clock source (E1/STM-1) and selects a reference source for phase lock based on priorities.
huawei(config)#clock source 0 0/5/0
Configure a priority for the system clock source.
Run the clock priority command to set the priority of clock source 0 to the highest priority.
huawei(config)#clock priority system 0
Query configurations and the status of the system clock source.
Run the display clock source system command to query configurations and the status of the clock source. Ensure that configurations of the system clock source are correct and the status is Normal.
huawei(config)#display clock source system ------------------------------------------------------------------------------ Index Board Source Clk-type State Priority QL Selected ------------------------------------------------------------------------------ 0 H801TOPA 0/5/0 E1 Normal 0 --- YES ------------------------------------------------------------------------------
Run the display clock mode command to query the clock working mode. Ensure that the clock daughter board works in tracing mode.
huawei(config)#display clock mode Clock manage-mode:Third-mode Clock subboard work-mode:Tracing
Configure a clock on the ONU.
Configure the GPON line clock as the system clock.
The system clock of the OLT is delivered to the ONU through the GPON port on the OLT, achieving clock synchronization between the OLT and the ONU.
Run the clock source command to configure the clock recovered from the GPON upstream port as the system clock of the ONU.
Run the clock priority command to configure the priority of the clock source.
huawei(config)#clock source 0 0/0/1 Clock source set succeeded huawei(config)#clock priority system 0
Configure the system clock as the transmit clock for an E1 port.
Run the interface tdm command to enter the E1 port configuration mode.
Run the tx clock or port portid udt system command to configure the system clock as the transmit clock of the port.
Run the display port state command to query the transmit clock of the E1 port.
huawei(config)#interface tdm huawei(config-if-tdm-)#port 0 udt system huawei(config-if-tdm-)#display port state 0 --------------------------------------- Port : 0 State : normal Mode : UDT Code : HDB3 Looptype : - Timeslot : - Clock : system CRC4 : - Signaling : - ESF : - Impedance : 120 Ohm ---------------------------------------
Query configurations and the status of the system clock source.
Run the display clock source command to query configurations and the status of the system clock source.
huawei(config-if-tdm-)#quit huawei(config)#display clock source --------------------------------------------------------------- Index Config Type Source State Priority Output --------------------------------------------------------------- 0 YES 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 -- -/ -/ - --- --- --- ---------------------------------------------------------------
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