The survivability unit can only be used in AP 3700 IP access points. However, it can control all possible IPDA access point models (AP 3300 IP, AP 3500 IP, AP 3700 IP) and OpenScape 4000 SoftGates. Access points are controlled regardless of whether the access point features NCUI2+ or NCUI4.

The survivability unit consists of a cassette with cPCI backplane, DSCXL2 processor, power supply and redundant fan trays.

Depending on the power supply module, it can be powered with 110/230 V alternating current or 48 V direct current. In AP 3700 IP, there is no electrical connection between the access point and the survivability unit.

Communication between the survivability unit and the NCUI2+/4 on the same access point/OpenScape 4000 SoftGate only runs via the IP network.