User manual

34 Wide Bank 28 DS3 - Release 2.4
Loopbacks
Loopbacks
The following steps show how to perform various loopbacks.
CAUTION! A LOOPBACK WILL AFFECT SERVICE.
1. Near-End Loop Code Detection
The following commands allow or inhibit the detection of received NIU loop codes. The Wide Bank 28 DS3
responds only to line loop codes. Each T3, T1, and E1 facility has its own loop code pattern.
ALW-LPBK-T3:tid:aid:ctag;
ALW-LPBK-T1:tid:aid:ctag;
ALW-LPBK-E1:tid:aid:ctag;
ALW-LPBK-ALL:tid:ALL:ctag;
INH-LPBK-T3:tid:aid:ctag;
INH-LPBK-T1:tid:aid:ctag;
INH-LPBK-E1:tid:aid:ctag;
INH-LPBK-ALL:tid:ALL:ctag;
Loopback Diagrams
T3 NIU Loopup
T1/E1 NIU Loopup
Example Command
Allow loop code detection on DS3 ALW-LPBK-T3:tid:ALL:ctag;
Allow loop code detection on DS1 #1 ALW-LPBK-T1:tid:DS1-1:ctag;
Inhibit loop code detection on all DS1 facilities INH-LPBK-T1:tid:ALL:ctag;
Inhibit loop code detection on all facilities INH-LPBK-ALL:tid:ALL:ctag;
Facility AID
T3 ALL
T1 DS1-1 to DS1-28, or ALL
E1 E1-01 to E1-27, or ALL (see
T3-E1 Configuration AIDs on
page 8)
ALL ALL
Send AIS
Relays
Trans-
ceiver
Selector
M13
Framer
Trans-
ceiver
Relays
LS Card HS Card
Toward DS1/E1
DS1/E1 DS3
Loopback
Toward DS3
NIU Loop-Up
From Test Set
NIU Loop Detect
Must be Enabled
Send AIS
Relays
Trans-
ceiver
Selector
M13
Framer
Trans-
ceiver
Relays
LS Card HS Card
Toward DS1/E1
DS1/E1 DS3
Loopback
Toward DS3
NIU Loop-Up
From Test Set
NIU Loop Detect
Must be Enabled