Troubleshooting and Maintenance
5-22
9161-A2-GH30-20
September 1997
Data Port Tests
Data port tests are available to run on any of the synchronous DTE interfaces on
the T1 NAM and the Sync Data APM.
H
Data port loopbacks are defined in ITU V.54 and ANSI T1 403.
H
The Send V.54 Up/Down and FT1 Up/Down perform a similar function to LLB
Up and LLB Down, but are only sent on the DS0s associated with a particular
data port and will control the remote operation of the Data Channel Loopback
(a Sync Data Port test).
H
DTE Payload Loopback on the same port
"
Procedure
To start and stop a data port loopback test:
1. Follow this menu selection sequence:
Main Menu
→
Test
→
Sync Data Port Tests
2. Enter the desired slot and port number.
3. Highlight Start under Command in the selected test’s row to send a test.
Then, press Return to start the test.
4. View the length of time that the test has been running in the Results column.
5. Highlight Stop under Command to stop the test.
DTE Loopback (DTLB)
The DTE Loopback (DTLB) performs the same function on the DTE interface that
the LLB does on the Network or DSX-1 interface. Use DTLB for isolating
problems on the DTE interface. An attached device or test equipment must
generate data to be looped back.
496-15213
Network
Interface
DSX
Port
DCE
Port 1
DCE
Port 2
All 1s
The following test cannot be running when a DTLB test is initiated:
H
DTE Payload Loopback on the same port
