Ds1 Loopbacks - Black Box Compact T1 MT850A User Manual

Diagnostices & Troubleshooting
Loopbacks Overview

DS1 Loopbacks

Note: T1 LEDs flash green during any DS1 loopback.
DS1 Line Loop
Loops at DS1 (at framer),
signal not reframed. Have
DS1 vendor check for
framing/errors.
Enable Line Loopback
> set a:1 line loopup
OK
View Status of Loopback
DS1 Status
> status a:1
SLOT A:
Status for DS1
Disable Line Loopback
> set a:1 line loopdown
OK
View Status of Loopback
DS1 Status
> status a:1
SLOT A:
Status for DS1
B-8
1:
Receive:
Transmit:
Loopback:
1:
Receive:
Transmit:
Loopback:
Local Local
DTE DCE
V.35
FXS
Adit 600
Compact T1
Telephone
Traffic
Traffic
LINE
Traffic
Traffic
OFF
T1
DS1
Network
Loops DS1 as shown
Signal Not Reframed
Compact T1 - Release 6.1