A SERVICE OF

logo

Processor
module (R3)
(with feature
module)
Power supply
module
Processor
module
(FM1 and 2)
(with feature
module)
Line module
with DTMF
(400)
Line
module
(800)
Tie line
module
(400EM)
Line/station
module
(408)
Digital
station-module
(008D)
Station
module
(000)
Basic
telephone
module
(012)
FIGURE 1-4 Control unit components (continued).
1-20 System Hardware