Sl1100 main ksu 0 x 8 x 4 model ip4na 1228 b ksu includes the following hardware components cpu board cpu b1 8 digital x 4 analog station board 084m b1 voice mail daughter board pz vm21 memory daughter board pz me50 power supply amp ac cable 85 ft analog station ring supply amp mw lamp driver provides built in 2 channel auto attendant 4 mobile extension ports 16 telephony resources dtmfdtbusyfsk cid 128 tone sender resources system tonesdtmf 32 conference channel r