A byte value which contains product specific information:
bit 0 - System in AIS on the local line unit.
1 - System in AIS on the remote line unit.
2 - Channels are reversed on the remote line unit.
3 - Channels are reversed on the doubler 1.
4 - Channels are reversed on the doubler 2.
5 - Power is fed to the next unit on the local line unit.
6 - Power is fed to the next unit on the remote line unit.
7 - Smartloop is active on remote line unit. (HiGain only)