The compact, wall-mountable DS1000 main equipment cabinet contains all the system’s common control circuitry and provides connection for trunks (outside lines), extensions, Door Boxes and other peripherals. Without the plug in Expansion Board installed, the DS1000 cabinet supports:

• 3 trunks
• 8 digital extensions
• 4 analog extensions
• 1 Analog Door Box
• 1 Analog Door Box Control Relay that can alternately be used for External Paging amplifier control
• 1 External Paging output
• 1 Music input
• "A" version required for IntraMail