User manual

Diagnostics & Troubleshooting
Testing Low-Speed Interface Operation
7-20 July 2004 Wide Bank 28 DS3 - Release 2.4
DS1 Line Loopback
1. Configure for line loopback.
(A:Active)> ds1 1 line on
Figure 7-9 Low-Speed Line Loopback
2. Send a pattern from the test set on the low-speed circuit, and verify that the test set synchronizes
on the pattern without errors.
3. When finished, disable line loopback.
(A:Active)> ds1 1 line off
DS1 Equipment Loopback
1. Configure the low-speed circuits for equipment loopback.
(A:Active)> ds1 1 equipment on
Figure 7-10 Low-Speed Equipment Loopback
2. Test from the DS3 side and verify that there are no errors.
3. When the test is complete, disable equipment loopback.
(A:Active)> ds1 1 equipment off
Loopback
Relays
Trans-
sceiver
Selector
M13
Framer
Trans-
ceiver
Relays
LS Card HS Card
Toward DS1/E1
DS1/E1 DS3
Send AIS
Toward DS3
Send AIS
Relays
Trans-
ceiver
Selector
M13
Framer
Trans-
ceiver
Relays
LS Card HS Card
Toward DS1/E1
DS1/E1 DS3
Loopback
Toward DS3