
Configuring Synchronous Services
117021-A Rev. A 2-7
Setting the Internal Clock Speed
The Internal Clock Speed parameter sets the clock speed of an internally supplied
clock when the Clock Source parameter is set to Internal. You cannot set this
parameter when the Clock Source parameter is set to External.
By default, the internal clock speed is 64 Kb/s. Set the clock speed for the internal
clock to the desired data transmission rate across the synchronous line.
You can set the internal clock to
• 1200, 2400, 4800, 7200, 9600, 19200, 32000, or 38400 bytes
• 56, 64, 125, 230, 420, 625, or 833 Kb
• 1.25, 2.5, or 5 Mb
Some routing protocol software uses this parameter value for route selection. If
you configure protocol prioritization, the router uses this parameter to calculate
line delay. See Configuring Traffic Filters and Protocol Prioritization for
information about protocol prioritization, latency, and queue depth.
Set the internal clock speed for the interface.
Setting the External Clock Speed
The External Clock Speed parameter sets the clock speed of an externally
supplied clock when the Clock Source parameter is set to External. You cannot set
this parameter when the Clock Source parameter is set to Internal.
By default, the external clock speed is 64102 b/s. Set the clock speed for the
external clock to the data transmission rate that most closely corresponds to the
speed of the external clock. You can set the external clock to a value from 1200 to
6000000 b/s.
Some routing protocol software uses this parameter value for route selection. If
you configure protocol prioritization, the router uses this parameter to calculate
line delay. See Configuring Traffic Filters and Protocol Prioritization for
information about protocol prioritization, latency, and queue depth.
Site Manager: Internal Clock Speed parameter: page A-43
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