Specifying An Idle Character - Cisco 10000 Series Configuration Manual

Unchannelized T3 Commands
In the following example, scrambling is enabled on the specified T3 interface:
Router(config)# interface serial 1/0/0
Router(config-if)# scramble

Specifying an Idle Character

To set a specific character on the unchannelized T3 interface to be transmitted between HDLC packets,
use the idle character command from interface configuration mode.
idle-character
[no] idle-character
Where:
•
•
The default idle character is 0x7e.
Use the no form of the command to return the idle character to its default.
In the following example, the idle character is set to flags:
Router(config)# interface serial 1/0/0
Router(config-if)# idle-character flags
Some systems interpret marks, 0xff, as an abort signal. Therefore, flags, 0x7e, is preferred.
Note
Running a BER Test
You can configure an unchannelized T3 interface to run a bit error rate (BER) test. The test can be used
in checking cables and solving signal problems in the field. To send a BER test pattern on an
unchannelized T3 interface, use the following interface configuration command:
bert [errors number | pattern pattern] interval time
[no] bert
Where:
•
•
•
You can terminate a BER test at any time using the no bert command.
For more information, refer to the online
Cisco 10000 Series Router Line Card Configuaration Guide
8-8
[ |
flags marks
[
flags
flags sets an idle character of 0x7e.
marks sets an idle character of all 0xff.
errors number is 1 to 255.
pattern pattern is
0s—repetitive test pattern of all zeros (00000... )
–
1s—repetitive test pattern of all ones (11111... )
–
2^15—pseudorandom O.151 test pattern (32,768 bits long)
–
– 2^20-O153—pseudorandom O.153 test pattern (1,048,575 bits long)
– QRSS-2^20—pseudorandom QRSS O.151 test pattern (1,048,575 bits long)
– 2^23—pseudorandom O.151 test pattern (8,388,607 bits long)
interval time is 1 to 1440 minutes.
Chapter 8
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Cisco 10000 Series Internet Router Troubleshooting
6-Port Channelized T3 Line Card Configuration
Guide.
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