AT&T 518-600-016 manual Control unit components System Hardware

Power supply	Processor	Processor	Line/station	Station
module	module (R3)	module	module	module
		(FM1 and 2)	(408)	(000)
	(with feature
		(with feature
	module)	m o d u l e )

Line	module	Line	Tie line	Digital	Basic
with	DTMF	module	module	station-module	telephone
(400)		(800)	(400EM)	(008D)	module
					(012)

FIGURE 1-4 Control unit components (continued).

1-20 System Hardware