Starting A Line Loopback; Starting A Payload Loopback - Paradyne 3350 User Manual

ACCULINK 3350 E1 NTU

Starting a Line Loopback

The Line Loopback command (LLB) loops the
received signal on the network interface back to the
network without change.
NTU
AIS
DTE
(G.703)
LINE LOOPBACK (LLB)
To perform a Line loopback,
1. From the top-level menu screen, select Test.
2. From the Test screen, select Lpbk.
Test:
Lpbk
F1
3. From the Loopback screen, select LLB.
Loopback:
Abort
F1
Test Started appears on Line 2. If a line loopback
is already in progress, the Already Active
message appears. If an invalid combination of
loopbacks is in progress, the error message Invld
Test Combo appears (see Table 4-9 for valid
loopback test combinations).
4-16
LLB HDSL
495-14758
Ptrns Lamp
F2 F3
LLB PLB
F2 F3
June 1996

Starting a Payload Loopback

The Payload Loopback command (PLB) loops the
received signal on the network interface back to the
network. The signal is looped back as close to the G.703
DTE port as possible (after it has passed through the
framing circuitry of the E1 NTU). Therefore, framing
CRCs and BPVs are corrected.
NTU
AIS
DTE
PLB
(G.703)
PAYLOAD LOOPBACK (PLB)
To perform a Payload loopback,
1. From the top-level menu screen, select Test.
2. From the Test screen, select Lpbk.
Test:
Lpbk
F1
3. From the Loopback screen, select PLB.
Loopback:
Abort
F1
Test Started appears on Line 2. If a Payload
loopback is already in progress, the Already
Active message appears. If an invalid combination
of loopbacks is in progress, the error message
Invld Test Combo appears (see Table 4-9 for
valid loopback test combinations).
HDSL
495-14759
Ptrns Lamp
F2 F3
LLB PLB
F2 F3
3350-A2-GB20-10