This variable represents the desired loopback
configuration of the DS3 interface.
The values mean:
ds3NoLoop
Not in the loopback state. A device that is
not capable of performing a loopback on
the interface shall always return this as
its value.
ds3PayloadLoop
The received signal at this interface is looped
through the device. Typically the received signal
is looped back for retransmission after it has
passed through the device's framing function.
ds3LineLoop
The received signal at this interface does not
go through the device (minimum penetration) but
is looped back out.
ds3OtherLoop
Loopbacks that are not defined here.
ds3InwardLoop
The sent signal at this interface is looped back
through the device.