IMC Networks FAIL-SAFE MOR-F-632-120-EB82 - Manual (Page 17)

13
Loopback
Each E1 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 E1 copper port, connected to the Host unit, is looped back
to that port within the local unit. E1 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 E1 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 E1 line of the remote unit. The remote’s incoming
E1 copper line is also looped-back to the copper line within the remote unit.
The default value for loopback is "none."