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Loopback
Each T1 port can be tested in loopback mode by enabling either a Host loopback or
Remote loopback test path. This capability allows the end-user to help troubleshoot
and isolate system problems such as improper/broken line terminations, cables or
malfunctioning equipment.
With Host loopback, the T1 copper port, connected to the Host unit, is looped back
to that port within the local unit. T1 data coming from the remote unit to that port
over the optical link is also looped back to the remote unit at the same point within
the local unit.
With remote loopback, an T1 line connected to the Host unit is transported onto the
optical link and looped back within the remote unit back onto the optical link
without passing onto the copper T1 line of the remote unit. The remote’s incoming
T1 copper line is also looped-back to the copper line within the remote unit.
The default value for loopback is "none."
T1 Mux HOST T1 Mux REMOTE
T1
HOST
Loopback
Remote
Loopback
T1
Fiber
Copper
Fiber
Copper
Fiber