User manual

Product Description
Tests and Loopbacks
2-30 July 2004 Wide Bank 28 DS3 - Release 2.4
Low-Speed Loopback Modes
NOTE: For details on how to run low-speed loopback tests, see Testing Low-Speed
Near-End with Loop Tests on page 7-19.
Low-Speed Line Loopback
The low-speed line loopback loops the low-speed signal back to the low-speed interface.
Figure 2-11 Low-Speed Line Loopback Mode
Low-Speed Equipment Loopback
The low-speed equipment loopback loops the low-speed signal back to the Wide Bank.
Figure 2-12 Low-Speed Equipment Loopback Mode
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