Starting A Dte Loopback; Starting A Repeater Loopback - Paradyne 3350 User Manual

Starting a DTE Loopback

The DTE Loopback command (DLB) loops the
received signal on the G.703 DTE port back to the DTE
without change.
A DTE loopback can be activated and deactivated
based on the state of an external contact on the G.703
DTE port. If this option is enabled with the DTE Interface
configuration option Extrn DLB, closing the contact
activates a DLB. The DLB remains active until the
contact is opened. Refer to the G.703 DTE Interface
section in Appendix D, Pin Assignments, for more
information.
NTU
DTE
DLB
(G.703)
DTE LOOPBACK (DLB)
To perform a DTE 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, press the
the DLB selection appears on the screen.
Loopback:
Abort
F1
3350-A2-GB20-10
AIS
HDSL
495-14760
Ptrns Lamp
F2 F3
key until
LLB PLB
F2 F3
June 1996
4. Select DLB.
Loopback:
LLB
F1
Test Started appears on Line 2. If a DTE
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).

Starting a Repeater Loopback

The Repeater Loopback command (RLB) loops the
signal being sent to the network back to the G.703 DTE
and data ports. The signal is looped back as close to the
network interface as possible (after it has passed through
the framing circuitry of the E1 NTU). Therefore, framing
CRCs and BPVs are corrected.
NTU
DTE
(G.703)
REPEATER LOOPBACK (RLB)
To perform a Repeater loopback,
1. From the top-level menu screen, select Test.
2. From the Test screen, select Lpbk.
Test:
Lpbk
F1
Maintenance
PLB DLB
F2 F3
AIS
RLB HDSL
495-14761
Ptrns Lamp
F2 F3
4-17