Loopback On T1 Interfaces - Cisco ASR 900 Series Configuration Manual

Configuring T1 Interfaces
DSX1 BERT interval : 5
DSX1 BERT time remain : 2
DSX1 BERT total errs : 0
DSX1 BERT total k bits: 0
DSX1 BERT errors (last): 0
DSX1 BERT k bits (last): 0
Last clearing of BERT counters never
No alarms detected.
alarm-trigger is not set
Soaking time: 3, Clearance time: 10
AIS State:Clear LOS State:Clear LOF State:Clear
Framing is unframed, Line Code is B8ZS, Clock Source is Internal.
Data in current interval (320 seconds elapsed):
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
Total Data (last 3 15 minute intervals):
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

Loopback on T1 Interfaces

You can use the following loopback on the T1 interfaces.
Loopback
loopback diag
loopback local
loopback local line
loopback local payload
loopback network line
1 port OC48/ 4 port OC12/OC3 + 12 port T1/E1 + 4 port T3/E3 CEM Interface Module Configuration Guide, Cisco IOS
Running Bit Error Rate Testing
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.
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 available
Note
only when framing is ESF.
Loops the incoming signal back in the interface
module using the line loopback mode of the framer.
The framer does not reclock or reframe the incoming
data. All incoming data is received by the interface
module driver.
XE Fuji 16.7.x (Cisco ASR 900 Series)
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