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Configuring clocking on T1 circuits


Typically ISP's only provide clocking when connecting to them (ie MPLS). If  you have point-to-point T1's, you usually need to provide the clocking.
On one side you can leave the clocking to the default of line. On the other side  set the clocking to internal.

controller T1 0/2/0
  framing esf
  clock source internal
  linecode b8zs
  channel-group 0 timeslots 1-24

If you have multiple T1's, some private and some to a carrier, you may need  to set the lines to the carrier to not use the internal clocking. To allow the  ports on a specified network module or voice/WAN interface card (VWIC) to use  the network clock for timing, use the network-clock-participate command in  global configuration mode. To restrict the device to use only its own clock  signals, use the no form of this command.

no network-clock-participate wic 0

Here is an example of misconfigured timing. Latency was high and packet loss  was consistent at about 2%.


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