Verilink Access Manager 2000 (896-502037-001) Product Manual - Manual (Page 318)

Monitoring and Troubleshooting Access Manager
8-48 Access Manager 2000 User Manual
firmware revision in the CSU is required to use this feature. If you hav
an NCC 2020 or CCC 1020 and TAC 2010 or TAC 1010, this function is
available from the
On-line Select Test Menu.
Deactivate Framed ALL-ONEs Signal To Network
For 551VST type CSUs, this command deactivates the framed ALL-
ONEs test signal activated by the
Activate option above.
Send LLB or PLB Activate Message to Far End (T1.403)
These options are available only for the NCC 2020 or CCC 1020 and
TAC 2010 or TAC 1010 of Access System 2000 type nodes. Each option
activates an LLB or PLB at the far-end NCC, CCC, or TAC by sending it
an ANSI T1.403-compatible bit-oriented message on the ESF Data Link.
Send LLB or PLB Deactivate Message to Far End (T1.403)
These options are also available only for NCC, CCC, or TAC. They
deactivate the LLBs or PLBs previously activated via the T1.403 loop-up
messages above.
Note: If the framed ALL-ONEs signal is being transmitted, send inband
codes will not work; use options (Activate LLB) and/or C
(Deactivate PLB and LLB) instead. However, this procedure does
not work if the far-end CSU is a 4016 List 1 or 551VST List 1/A.
In these cases, you must first deactivate framed ALL-ONEs signal
(option K); then transmit the inband code (options D and E) and
finally restore framed ALL-ONEs (option J).
Activating/Deactivating DIU loopbacks
This section provides a description of DIU loopbacks and the procedure
for activating and deactivating them.
The data port loopback of a DIU affects only the data ports on which it is
activated. All other data ports of the DIU remain uninterrupted.
Loopback
descriptions