8. Troubleshooting

Payload Loopback

The Payload Loopback (PLB) loops the information received on the selected interface back to the network after it has passed through the receive and transmit framing section of the device. Use the PLB to determine whether the problem is with the T1 facility or in the circuitry of the remote device.

Main Menu TestNetwork Physical Tests

Other

All

T1

Framer

PLB

The T1

Interface

1s

 

 

 

Interface

97-15337

CAUTION:

This test may affect operation of frame relay PVCs assigned to the selected interface. While in loopback, the frame relay link will be down so any IP data being sent while this test is active will be disrupted.

A PLB cannot be started when one of the following tests is active:

Line Loopback, Repeater Loopback, Send Remote Line Loopback, or an active Monitor Pattern on this network interface.

Payload or Repeater Loopback on any other T1 interface with DS0s assigned to this network interface.

Send Pattern Test on this network interface or any synchronous data port (Port

TUse set to Synchronous) assigned to this interface.

Send V.54 or FT1 Loopback, or Data Channel Loopback on any synchronous data port (Port Use set to Synchronous) and assigned to this network interface.

8-28

September 2002

9128-A2-GB20-80

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Paradyne CSU, DSU, 9126-II, 9128-II manual Payload Loopback, Plb