A two bytes value for the Errored Second indication of the HDSL
line unit, including local, remote line units and the doublers.
each bit in the two bytes value has the following meaning if set:
Bit 0 : Errored Second on LOOP 1 of local line unit.
1 : Errored Second on LOOP 2 of local line unit.
2 : Errored Second on LOOP 1 of remote line unit.
3 : Errored Second on LOOP 2 of remote line unit.
4 : Errored Second on LOOP 1 of local line unit's network side.
5 : Errored Second on LOOP 2 of local line unit's network side.
6 : Errored Second on LOOP 1 of local line unit's customer side.
7 : Errored Second on LOOP 2 of local line unit's customer side.