clock source (T3/E3)
To set clocking for individual T3 or E3 links, use the clock source command in T3 or E3 configuration mode.
To return to the default, use the no form of this command.
clock source {internal| line}
no clock source
Syntax Description
Specifies that the clock is generated from the internal clock of the T3 controller. The default
is internal.
When configuring clocking on a serial link, you need to configure one end to be
internal and the other end to be line. If you configure internal clocking on both
ends of a connection, framing slips occur. If you configure line clocking on both
ends of a connection, the line does not come up.
Note
internal
Specifies that the clock on this controller derives its clocking from the external source to
which the controller is connected, which is generally the telephone company central office
(CO).
line
Command Default
The default clock source is internal.
Command Modes
T3 configuration
E3 configuration
Command History
ModificationRelease
This command was introduced.Release 3.9.0
Support for E3 configuration mode was added.Release 4.0.0
Usage Guidelines
To use this command, you must be in a user group associated with a task group that includes appropriate task
IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator
for assistance.
If you do not specify the clock source command, the default clock source is used.
Configure the clock source line command if your telephone company or the remote data service unit provides
the master clock of the T3 or E3 connection.
Configure the clock source internal command if your router provides the master clock of the T3 or E3
connection.
Cisco ASR 9000 Series Aggregation Services Router Interface and Hardware Component Command Reference,
Release 5.3.x
968
T3, E3, T1, E1 Controller Commands on the Cisco ASR 9000 Series Router
clock source (T3/E3)
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