This variable represents the loopback confi-
guration of the Sonet interface. Agents support-
ing read/write access should return badValue in
response to a requested loopback state that the
interface does not support. The values mean:
sonetNoLoop
Not in the loopback state. A device that
is not capable of performing a loopback on
the interface shall always return this as
it's value.
sonetPayloadLoop
The received signal at this interface is
looped through the device. Typically the
received signal is looped back for re-
transmission after it has passed through
the device's framing function.
sonetLineLoop
The received signal at this interface does
not go through the device (minimum pene-
tration) but is looped back out.
sonetOtherLoop
Loopbacks that are not defined here.