
Configuring WAN Line Services
2-8
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Configuring Clocking Signals
By default, the synchronous interface operates with an external clock source at
64102 b/s. You can configure the source and speed of synchronous timing signals
by:
• Setting the Clock Source
• Setting the Internal Clock Speed
• Setting the External Clock Speed
Setting the Clock Source
The Clock Source parameter specifies whether the origin of the synchronous
timing signals are supplied by the router (Internal) or by a network device
(External).
With this parameter set to Internal, the router supplies the required timing signals.
If you set the Clock Source parameter to Internal, set the Internal Clock Speed
parameter as described in “
Setting the Internal Clock Speed” on page 2-9.
With this parameter set to External (the default), an external network device
supplies the required timing signals. In most cases, you should set this parameter
to External. See “Setting the External Clock Speed” on page 2-10
.
Using the BCC
To set the clock source, navigate to the serial prompt (for example,
box
;
serial/2/1
) and type:
clock-source
variable
For example:
serial/2/1#
clock-source internal
serial/2/1#
clock-source external
Using Site Manager
See the Clock Source parameter on page A-72 for information.
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