Paradyne 317x E1 Starting a Line Loopback, Starting a Payload Loopback, Loopback Abort LLB PLB

ACCULINK 317x E1 DSU/CSU

Starting a Line Loopback

The Line Loopback command (LLB) loops the received signal on the network interface back to the network without change.

To perform a Line loopback,

1.Press F2 to select Test from the top-level display screen.

2.From the Test screen, press F2 to select Lpbk.

Test:

Rlpbk Lpbk Ptrns

F1 F2 F3

3.From the Loopback screen, press F2 to select LLB.

Loopback:

Abort LLB PLB

F1 F2 F3

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 4-8 for valid loopback test combinations).

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 DTE Drop/Insert port as possible (after it has passed through the framing circuitry of the E1 DSU/CSU). Therefore, framing CRCs and BPVs are corrected.

To perform a Payload loopback,

1.Press F2 to select Test from the top-level menu screen.

2.From the Test screen, press F2 to select Lpbk.

Test:

Rlpbk Lpbk Ptrns

F1 F2 F3

3.From the Loopback screen, press F3 to select PLB.

Loopback:

Abort LLB PLB

F1 F2 F3

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 4-8 for valid loopback test combinations).

4-16 December 1996 3170-A2-GB20-20