6. Troubleshooting
9123-A2-GB20-20
August 2001
6-25
Data Channel Loopbacks on a Frame Relay Link
A network-initiated Data Channel Loopback (DCLB) that loops data over the frame
relay link (DS0s) received on the network interface through the FrameSaver unit’s
framing circuitry and back to the same interface.
A DCLB can be controlled over the frame relay link using one of the following
in-band methods:
V.54 Loopback.
ANSI T1.403 Annex B Fractional T1 (FT1) Channel Loopback.
The frame relay service provider can use DCLB to verify the integrity of the frame
relay circuit.
CAUTION:
V.54 and FT1 Loopbacks may affect the operation of the frame relay
PVCs assigned to the selected port. While in loopback, the frame relay
link will be down so any IP data being sent while this test is active will be
disrupted.
Framer
Other
T1
Interface
DCLB
The T1
Interface
All
1s
98-16223
Summary of Contents for FrameSaver FLEX 9123
Page 1: ...FrameSaver FLEX 9123 User s Guide Document No 9123 A2 GB20 20 August 2001 ...
Page 10: ...Contents viii August 2001 9123 A2 GB20 20 ...
Page 24: ...1 About the FrameSaver FLEX 9123 1 10 August 2001 9123 A2 GB20 20 ...
Page 34: ...2 User Interface and Basic Operation 2 10 August 2001 9123 A2 GB20 20 ...
Page 98: ...3 Configuration 3 64 August 2001 9123 A2 GB20 20 ...
Page 212: ...8 Setting Up NetScout Manager Plus for FrameSaver Devices 8 18 August 2001 9123 A2 GB20 20 ...
Page 228: ...A Menu Hierarchy A 6 August 2001 9123 A2 GB20 20 ...
Page 258: ...B SNMP MIBs and Traps and RMON Alarm Defaults B 30 August 2001 9123 A2 GB20 20 ...
Page 266: ...C Connectors Cables and Pin Assignments C 8 August 2001 9123 A2 GB20 20 ...