H3C Technologies H3C SR8800 - Manual (Page 102)

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# Enable the clock source from POS 3/1/1, set the clock to work in manual mode and adopt clock
source 8, which corresponds to slot 3 on an SR8808 router (see Figure 32 for the relationship
between reference source and slot).
[DeviceB] clock manual source 3
Through the above configurations, all the other WAN interface cards get the same clock frequency
derived by the clock card from the port 1 line clock of the POS interface card. In this way, all the
service cards on the device can get precise, reliable, synchronized SDH line interface clock
signals.