Verilink Access Manager 2000 (896-502037-001) Product Manual - Manual (Page 316)

Monitoring and Troubleshooting Access Manager
8-46 Access Manager 2000 User Manual
7. If you are deactivating a loopback and you previously changed the
CSU timing, restore the timing to its original mode.
8. If you are activating a loopback, a warning message appears telling
you that the selected test will place the DS1 line out of service .
A prompt also appears, asking you to confirm that you want to
proceed with the loopback. To do so, type
Y . Any other response
aborts the test.
9. All loopbacks you have activated remain active until you deactivate
them, with the exception of RLB. The RLB time-out was set when
you configured the CSU. If the RLB time-out was set to the value
FOREVER , it does not time out.
Access Manager allows you to activate or deactivate a loopback on a CSU
circuit element for DS1 circuit troubleshooting purposes. Each CSU
circuit element has loopbacks at four locations along the circuit path.
Activate Repeater Loopback (RLB)
The repeater loopback (RLB) connects the CSU output signal back
toward the equipment (EQPT). It loops the whole CSU (except the CSU
network input and output transformers) toward the EQPT. This loopback
has a time-out that automatically releases the loopback after the time
selected. This time-out is programmable from Access Manager.
Activate Line Loopback (LLB)
The line loopback (LLB) connects the incoming signal from the network
(NET) back to the network at a point just after the CSU repeater. It
includes only the NET-side repeater and the network-side critical
circuitry in the loopback.
CSU loopback
options