Configuring Loopback Mode - Cisco 10000 Series Configuration Manual

Channelized T1 Commands
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Note
You can terminate a BER test at any time using the no form of the command.
For more information, refer to the online
Examples:
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Configuring Loopback Mode

If problems occur when you configure a T1 interface, you can troubleshoot the line card by using the
following command from controller configuration mode:
t1 t1-number loopback
bellcore
[no] t1 t1-number loopback
Where:
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Cisco 10000 Series Router Line Card Configuaration Guide
8-18
pattern is
0s—repetitive test pattern of all zeros (00000... )
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1s—repetitive test pattern of all ones (11111... )
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2^11—pseudorandom test pattern (2048 bits long)
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2^15—pseudorandom O.151 test pattern (32,768 bits long)
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2^20-O153—pseudorandom O.153 test pattern (1,048,575 bits long)
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2^20-QRSS—pseudorandom QRSS O.151 test pattern (1,048,575 bits long)
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2^23—pseudorandom O.151 test pattern (8,388,607 bits long)
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alt-0-1—repetitive alternating test pattern of zeros (0s) and ones (1s), for example 01010101
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unframed causes the BER test pattern to use the entire T1 bandwidth, including the T1 framing and
payload bits. If unframed is omitted, the T1 is either SF or ESF framed as configured by the T1 n
framing command, and the BER test pattern occupies only the T1 payload bits.
For each T3, you can run only one BER test at a time.
Send a BER test pseudorandom pattern of 2^20 through T1 interface 10 for 5 minutes.
Router(config)# controller T3 1/0/0
Router(config-controller)# t1 10 bert pattern 2^20 interval 5 unframed
Send a repetitive pattern of all 1s through T1 interface 10 for 14,400 minutes (240 hours).
Router(config)# controller T3 1/0/0
Router(config-controller)# t1 10 bert pattern 1s interval 14400 unframed
[
local
} | ] |
inband payload
t1-number is T1 interface 1 to 28.
local loops the router output data back toward the router at the T1 framer and sends an alarm
indication signal (AIS) out toward the network.
network {line | payload} loops the data back toward the network and automatically sets a local
loopback at the HDLC controllers (line) or loops the payload data back toward the network and
automatically sets a local loopback at the HDLC controller (payload).
remote line fdl {ansi | bellcore} sends a repeating, 16-bit ESF data link keyword to the remote end,
requesting that it enter into a network line loopback. You can specify an ANSI or Bellcore keyword.
Chapter 8
Cisco 10000 Series Internet Router Troubleshooting
| { |
network line payload
[ | ]]]
fdl ansi
6-Port Channelized T3 Line Card Configuration
} | [ [ {
remote line fdl ansi
Guide.
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