Configuring T1 Loopback Mode - Cisco 10000 Series Configuration Manual

Channelized T1 Commands
BERT test result (running)
Test Pattern : 2^15, Status : Sync, Sync Detected : 1
Interval : 5 minute(s), Time Remain : 5 minute(s)
Bit Errors (since BERT started): 0 bits,
Bits Received (since BERT started): 36 Mbits
Bit Errors (since last sync): 0 bits
Bits Received (since last sync): 36 Mbits
The 4-Port Channelized T3 Half-Height line card supports any combination of six T1 BER tests
simultaneously for each set of two ports. That is, six T1 BER tests for ports 0 and 1, and six T1 BER
tests for ports 2 and 3.
Channelized T3 Half-Height line card.
Table 4-4
Port Number
Port 0
Port 1
Port 2
Port 3

Configuring T1 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:
[no] t1 t1-number loopback
bellcore
Where:
•
•
•
•
Note
Cisco 10000 Series Router Line Card Configuaration Guide
4-22
Table 4-4
Sample BER Test Distribution
} | [
inband maintenance
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.
Loopback codes are defined in ANSI T1.404-1989 Table 3 (Assigned Bit-Oriented ESF
Data-Link Messages).
The 4-Port Channelized T3 Half-Height line card sends the following code for remote line FDL
ANSI loopback:
Line Loopback Active Code: 0 000111 01111111
–
Line Loopback Deactivate Code: 0 010010 01111111
–
Chapter 4 4-Port Channelized T3 Half-Height Line Card Configuration
shows a sample BER test distribution for the four ports of the 4-Port
BER Tests
6 T1 BER tests
1 T3 BER test
3 T1 BER tests
3 T1 BER tests
[ | { |
local network line
]] | [ |
payload fdl ansi
} | [
payload remote line
]]]
[ { |
fdl ansi
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