This object allows the management client to configure
loopback for the client side or trunk side interfaces.
'noLoop' - No Loopback present.
'diagnosticLoop' - This is an internal loopback, where the
data stream is looped from the transmit
to receive section. It is used for hardware
debug, bring-up and diagnostics.
'lineLoop' - In this mode, the receive data stream is
looped back to the transmit side.
'otherLoop' - This indicates loopbacks not defined here.
The default value of this object will be 'noLoop'.