NEC – B48-U10 KSU (750005)
The Key Service Unit (KSU) for the Electra Elite 48 comes equipped with a built in CPU (MBD-U10) and support for eight digital telephones. This KSU provides for seven slots. Slot one is dedicated to the eight built in digital ports, Slot 2 is reserved for MIF connection, Slot 3-6 are interface slots with MDF connections, and Slot 7 is an interface with no MDF connection. Slot 7 may be used to support a VMS, PBR, or VRS card. Each KSU is equipped with system back up batteries, 4PBR circuits, 16 conference circuits, 1 paging input, and one Power Failure Transfer circuit.