Setting The Clock Source - Cisco 10000 Series Configuration Manual

Chapter 8 6-Port Channelized T3 Line Card Configuration

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:
•
•
•
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 specification ANSI T1.403, on both ends of the T1 connection. To do so, use the
following command:
t1 t1-number fdl ansi
[ ]
no
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
Configuring a BER Test
You can configure an individual T1 interface to run an independent BER test. The test is used to check
cables and solve signal problems in the field. To send a BER test pattern on a T1 interface, use the
following command:
t1 t1-number bert pattern pattern interval time
[ ]
no
Where:
•
•
OL-8834-04
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
t1 t1-number fdl ansi
t1 t1-number bert
t1-number is T1 interface number 1 to 28.
time is 1 to 14,400 minutes.
[ ]
unframed
Cisco 10000 Series Router Line Card Configuaration Guide
Channelized T1 Commands
8-17