Setting The Clock Source - Cisco 10000 Series Configuration Manual

Channelized T3 Commands
Where patterns is a number in the range of 0x0 to 0xff (hexadecimal) or 0 to 255 (decimal). You can
enter this value in either hexadecimal or decimal form. Values of 0 to 254 set the idle pattern to HDLC
flags (0x7e); a value of 255 sets the pattern to 0xff (all ones).
Some systems interpret marks (or 0xf) as an abort signal. Therefore, flags (or 0x7e) is preferred.
Note
The default idle pattern is 0x7e.
Use the no form of the command to return the idle pattern to its default value.
Examples:
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•

Setting the Clock Source

At the prompt, set the internal or line clock source for the selected T3 controller using the clock source
command. This command is set in controller configuration mode.
clock source {internal | line}
Where:
•
•
The default is clock source internal.
In this example, a T3 controller is instructed to use a line clock source.
Router(config)# controller T3 1/0/0
Router(config-controller)# clock source line
Note The clock source cannot be specified as line on both ends of the connection.
Configuring Loopback Mode
You can configure the T3 controller for loopback mode using the loopback command.
[no] loopback
Local and network loopbacks are the same.
To cancel a loopback, use the no form of the command.
Note When you configure loopback under a channelized T3 controller, all the T1 interfaces are configured to
loopback mode.
Cisco 10000 Series Router Line Card Configuaration Guide
4-16
Set a hexadecimal idle pattern.
Router(config)# controller T3 1/0/0
Router(config-controller)# idle pattern 0x10
Set a decimal idle pattern.
Router(config)# controller T3 1/0/0
Router(config-controller)# idle pattern 23
internal specifies that the internal clock source is used
line specifies that the network clock source is used
[ |
local network
Chapter 4 4-Port Channelized T3 Half-Height Line Card Configuration
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remote
OL-8834-04