Verilink Access Manager 2000 (896-502037-001) Product Manual - Manual (Page 317)

Activating/Deactivating CSU loopbacks
Access Manager 2000 User Manual 8-47
Deactivate Network Loopback (PLB or LLB)
This command deactivates the LLB or payload loopback (PLB) in the
direction of the network.
Send Inband Loop-Up Code To Far End
This command causes the near-end CSU to send the industry-standard
inband loop-up code to the far-end CSU.
Send Inband Loop-Down Code To Far End
This command allows the near-end CSU to send an inband loop-down
code to the far-end CSU.
Activate PLB
This command causes the CSU to activate the PLB toward the network
(NET). This loopback is performed just inside the input/output
transformers on the EQPT side of the CSU. The PLB therefore includes
most of the CSU circuitry in the looped path.
Deactivate PLB
This command deactivates a PLB in progress.
Activate EQPT Loopback (ELB
This loopback loops the CSU toward the EQPT just inside the input/
output transformers on the EQPT side. As most of the CSU circuitry is
bypassed by this loopback, ELB is useful for testing the EQPT-to-CSU
cabling.
Deactivate EQPT Loopback (ELB and RLB)
This command deactivates an ELB or RLB in progress.
Activate Framed ALL-ONEs Signal To Network
This command causes framed ALL-ONEs test signal to be transmitted to
the network. This signal can be used in conjunction with a far-end LLB or
PLB to do limited testing of the network and far-end CSU. An upgraded