1462. Set the frequency of a BITSclock.• In standalone mode:network-clock source { bits0 | bits1 }frequency { bps-2m | hz-2m }• In IRF mode:network-clock chassischassis-number source { bits0 |bits1 } frequency { bps-2m | hz-2m }By default, the frequency of aBITS clock is 2 Mbps.This command is configurableonly on the default MDC.However, the command settingtakes effect on all MDCs.Specifying a line clock input portOnly main ports can be specified as line clock input ports. For the timing signal received on the line clockinput port to be used for synchronization, you must set the port to operate in slave mode.To specify a line clock input port:Step Command Remarks1. Enter system view. system view N/A2. Enter interface view. interface interface-typeinterface-number N/A3. Set the clock mode toslave. clock slave By default, slave clock mode is enabledon ports.4. Return to system view. quit N/A5. Specify the port as aline clock input port.network-clock lpuport port-typeport-numberBy default, no ports are configured as lineclock input ports.Configuring automatic reference selectionparametersConfiguring the method to set the SSM quality level of a clocksourceThe network clock monitoring module can use one of the following methods to assign an SSM qualitylevel to the timing signal from a clock source:• Uses the SSM quality level extracted from the received timing signal.• Uses the SSM quality level manually assigned as described in "Specifying an SSM quality level fora clock source."For BITS and PTP, you must perform this task on the default MDC. For a line clock, you must perform thistask on the MDC that contains the clock input port.
