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8. Troubleshooting
8-28
September 2002 9128-A2-GB20-80
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
→
Test
→
Network Physical Tests
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
Use 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.
97-15337
The T1
Interface
Other
T1
Interface
PLB
All
1s
Framer