Paradyne 317x E1 manual Starting a Data Terminal Loopback, Aborting Loopbacks

Maintenance

Starting a Data Terminal Loopback

The Data Terminal Loopback command (DTLB) loops the data received from the selected port, for all DS0 channels allocated to the port, back out of the port. This loopback occurs after the data passes through the port circuitry but before it reaches the E1 framer.

To perform a Data Terminal 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 four times to display the DTLB selection on the screen.

4.Press F3 to select DTLB.

Loopback:
RLB	DCLB	DTLB
F1	F2	F3

5.From the DTLB screen, press the Function key for the port for which you want to perform the data terminal loopback. Use the scroll keys, if necessary.

Loopback: DTLB

Prt1	Prt2	Prt3
F1	F2	F3

Test Started appears on Line 2. If a Data Terminal 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).

Aborting Loopbacks

The Abort Loopback command stops all loopback tests or any selected loopback test currently active on the E1 DSU/CSU.

To abort one or more loopback tests,

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 F1 to select Abort.

Loopback:

Abort LLB PLB

F1 F2 F3

3170-A2-GB20-20 December 1996 4-19