Loopback On T1/E1 Interfaces - Cisco T1 Configuration Manual

Configuring T1/E1 Interfaces on 48-Port T1/E1 Interface Module
Data in Interval 2:
Data in Interval 3:
Data in Interval 4:
You can view the results of a BERT test at the following times:
• After you terminate the test using the no bert command
• After the test runs completely
• Anytime during the test (in real time)

Loopback on T1/E1 Interfaces

Loopback Description
You can use the following loopback on the T1/E1 interfaces.
Loopback
loopback diag
loopback local
loopback local line
loopback local payload
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
0 Near-end path failures, 0 Far-end path failures, 0 SEF/AIS Secs
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, 0 Unavail Secs
0 Near-end path failures, 0 Far-end path failures, 0 SEF/AIS Secs
0 Line Code Violations, 0 Path Code Violations
0 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins
48-Port T1/E1 CEM Interface Module Configuration Guide, Cisco IOS XE Fuji 16.7.x (Cisco NCS 4200 Series)
Loopback on T1/E1 Interfaces
Description
Loops the outgoing transmit signal back to the receive
signal. This is done using the diagnostic loopback
feature in the interface module's framer. The interface
transmits AIS in this mode. Set the clock source
command to internal for this loopback mode.
Loops the incoming receive signal back out to the
transmitter. You can specify whether to use the line
or payload.
Loopback local is supported on E1 interface.
The incoming signal is looped back in the interface
using the framer's line loopback mode. The framer
does not reclock or reframe the incoming data. All
incoming data is received by the interface driver.
Loops the incoming signal back in the interface using
the payload loopback mode of the framer. The framer
reclocks and reframes the incoming data before
sending it back out to the network.
Loopback Local Payload support is
Note
available only when framing is ESF.
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