Paradyne 336x E1 Starting a Line Loopback, Starting a Payload Loopback, Loopback Abort LLB PLB

Maintenance

Starting a Line Loopback

The Line Loopback command (LLB) loops the received signal on the network interface back to the network without change. All ones are transmitted on the G.703 DTE port for the DS0 channels allocated to the network interface. All ones are also transmitted to each synchronous data port allocated to the network interface.

	NTU
	AIS
DTE	LLB	HDSL
(G.703)

LINE LOOPBACK (LLB)

495-14758

To perform a Line loopback,

1.From the top-level menu screen, select Test.

2.From the Test screen, select Lpbk.

Test:

Rlpbk Lpbk Ptrns

F1 F2 F3

3. From the Loopback screen, 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 4-9for 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 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. All ones are transmitted on the G.703 DTE port for the DS0 channels allocated to the network interface. All ones are also transmitted to each synchronous data port allocated to the network interface.

	AIS		NTU
DTE
		PLB		HDSL
(G.703)

PAYLOAD LOOPBACK (PLB)

495-14759

To perform a Payload loopback,

1.From the top-level menu screen, select Test.

2.From the Test screen, select Lpbk.

Test:

Rlpbk Lpbk Ptrns

F1 F2 F3

3. From the Loopback screen, 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 4-9for valid loopback test combinations).

3360-A2-GB20-20 December 1996 4-17