Specifying A Clock Source - Cisco 10000 Series Configuration Manual

Controller Configuration Commands
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Specifying a Clock Source

You use the clock command to choose whether the transmitted clock signal comes from the received
clock or is generated by an internal clock source. You use the following controller command to specify
the transmit timing source:
[no] clock source {line | internal}
Example:
Router(config-controller)# clock source line
The no form of this command sets the clock source to line, the default state.
Caution You should never configure both sides of an E1 or T1 link to clock source line.
Adding a Controller Description
You can use the description command to identify particulars about a controller interface. You can enter
up to 80 characters in your controller description string. To provide additional information about an
interface you use to the following controller command:
[no] description text
Where: text is the description string.
Example:
Router(config-controller)# description Subscriber X
Enabling T1 Facility Data Link Performance Monitoring
In T1 mode, you can specify the type of FDL (Facility Data Link) performance monitoring to use. You use
FDL performance monitoring to verify the integrity of the data link and to transfer statistics between devices.
FDL data is a diagnostic tool you use in remote testing of T1 network data links. You can specify either of 2
FDL performance monitoring versions for use in T1 networks:
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The version differences lie in the message protocols sent to or received from the remote device. To
specify the FDL version, use the fdl command:
[no] fdl {ansi | att}
Where:
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Cisco 10000 Series Router Line Card Configuaration Guide
5-24
In this example, channel groups 19, 20, and 21 are cancelled and timeslots 1 to 10, and 24 are
restored to the available port 0 channel-group pool.
Router(config)# controller t1 1/0/0
Router(config-controller)# no channel-group 19
Router(config-controller)# no channel-group 20
Router(config-controller)# no channel-group 21
Router(config-controller)#
ANSI
ATT
ansi—Conforms with the requirements of the ANSI T1.403-1995 specification to communicate
16-bit data-link code words between the line card and the remote device.
Chapter 5 24-Port Channelized E1/T1 Line Card Configuration
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