NEC DSX- 40 Key Service Unit (4 x 8 x 2) NEC #1090001 & DX7NA-40M

Contains:

•  Central Processor & Power Supply
• (4) Central Office line ports
• (8) DSX digital key telephone ports
• (2) conventional analog telephone ports

Also contains interface circuits for (2) analog door chime boxes (including relays)

Maximum system capabilities:

• (8) lines x (24) digital stations x (2) analog stations
• (8) lines x (16) digital stations x (10) analog stations
• (8) lines x (8) digital stations x (18) analog stations

Compatible with any DSX IntraMail  (1091060, 1091011 and 1091013) and the either DSX IntraMail Pro (1091051 and 1091053)