Setting The Clock Source - Cisco 10000 Series Configuration Manual

Channelized T1 Commands
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When you select SF framing for a full T1 interface (24 time slots) that uses the default speed of 64,
consider using the no t1-number yellow detection command to turn off yellow alarm detection, because
the yellow alarm can be incorrectly detected with SF framing.
In the following example, T1 interface 1 is set to yellow detection:
Router(config)# controller t3 1/0/0
Router(config-controller)# t1 1 yellow detection

Setting the Clock Source

You can set the internal or line (network) clock source for a T1 interface using the controller command.
t1 t1-number clock source {internal | line}
Where:
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The default is clock source internal.
In the following example, the interface is instructed to get its clock source from the line:
Router(config)# controller T3 1/0/0
Router(config-controller)# t1 1 clock source line
Configuring FDL
You can enable 1-second transmissions of performance reports through the facility data link (FDL)
according to the ANSI T1.403 specification, on both ends of the T1 connection. To do so, use the
following command:
[no] t1 t1-number fdl ansi
Where t1-number is T1 interface 1 to 28.
Use the no form of the command to disable this feature.
You can use this command only when the T1 framing is ESF.
Note
In the following example, FDL is enabled:
Router(config)# controller t3 1/0/0
Router(config-controller)# t1 2 fdl ansi
Cisco 10000 Series Router Line Card Configuaration Guide
4-20
detection means that the interface is told it is failing by the remote device, causing Cisco IOS to
send a message to the console.
generation means that the interface notifies the remote device if it is failing, causing Cisco IOS to
send a message to the console.
t1-number is T1 interface 1 to 28.
internal specifies that the internal clock source is used.
line specifies that the network clock source is used.
Chapter 4 4-Port Channelized T3 Half-Height Line Card Configuration
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