Verilink AS100 (896-502379-001) Product Manual - Manual (Page 59)

Access System Centum Series User Manual 4-7
Line Loop
LLB causes a local line loop (at the Centum Series unit where the
command was entered). RLB causes a remote line loop (at the distant end
of a point-to-point circuit); RLB should not be attempted in an Integrated
Access, Fractional T1 environment.
The CSU is excluded from the test path in a Line Loop configuration.
In a point-to-point circuit, the LLB and RLB are useful for looping back
any testing initiated by the other end, such as Payload, Serial Port, or
DSX-1 BERTs or any externally generated testing.
In an Integrated Access, Fractional T1 circuit, LLB is useful for looping
back Serial Port or DSX-1testing initiated by any remote location.
WHEN TESTING IS COMPLETED, BE SURE TO TURN THE LOOP
“OFF”.
Diagnostics
_NI/DSX-1 Port
iag. Menu,
/DOWN to
display:
NI/DSX-1 Diag.
NI LLB...:_On
DOWN and
ELECT as
to display:
NI/DSX-1 Diag.
NI RLB...:_On
DOWN and
SELECT as
to display:
OR