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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