Enabling Scrambling - Cisco 10000 Series Configuration Manual

Creating a T3, VT, or AUG Controller

Enabling Scrambling

To enable scrambling on an unchannelized T3 interface, use the scramble command from interface
configuration mode.
scramble
[no] scramble
The default setting for this command is no scramble (scrambling disabled).
Ensure that both sides of the link have the same scrambling setting.
In the following example, scrambling is enabled on the specified T3 interface:
Router(config)# interface serial 1/0/0.1
Router(config-if)# scramble
Specifying the 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 1/0/0.1
Router(config-if)# idle-character flags
Note Some systems interpret marks, 0xff, as an abort signal. Therefore, flags, 0x7e, is preferred.
Running a T3 BER Test under SONET or SDH Framing
You can configure an unchannelized T3 interface to run a bit error rate (BER) test. The test is used to
check cables and solve 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:
•
•
Cisco 10000 Series Router Line Card Configuaration Guide
6-20
[ |
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 in length)
–
Chapter 6
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1-Port Channelized OC-12/STM-4 Line Card Configuration
OL-8834-04