PS-702
The PS-702 is a two-channel intercom power supply that can supply up to two amps at 30 volts DC to two channels in a 1RU.
PS-704
The PS-704 is a four-channel, single-rack-space intercom power supply. The power supply delivers two amps at 30 volts, supplying power for one to four channels of intercom.
PK-7
The PK-7 is a single-channel intercom power supply housed in a rugged metal chassis and has the capacity to power up to 12 RS-701 headsets.