This variable represents the current state of the
loopback on the DS1 interface. It contains
information about loopbacks established by a
manager and remotely from the far end.
The ds1LoopbackStatus is a bit map represented as
a sum, therefore is can represent multiple
loopbacks simultaneously.
The various bit positions are:
1 ds1NoLoopback
2 ds1NearEndPayloadLoopback
4 ds1NearEndLineLoopback
8 ds1NearEndOtherLoopback
16 ds1NearEndInwardLoopback
32 ds1FarEndPayloadLoopback
64 ds1FarEndLineLoopback