Ttr

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MODULE	LINE/TRUNK	STATION TYPE	SPECIFICATIONS
	TYPE

012 (T/R)	n/a	Single-line telephone;	Capacity: 12 T/R stations
		MERLIN attendant;	on 2-way voice transmission path
		MERLIN MAIL Voice	with support for telephones with
		Messaging System T/R	message-waiting LEDs. 2 TTRs
		adjunct (such as an	Power: 21-VDC, 600-ohm
		answering machine or fax	battery source
		machine); analog data	Ringing current: 105-Vrms,
		device (such as a	30-Hz sinusoidal ringing
		modem)	superimposed on -48 VDC; a ring
			generator must be installed
			in the power supply module of
			each carrier that has a 012
			module
			REN: <1.0 per port
			Disconnect signal: 900 ms
			(T/R short for answering
			machines, G3 Fax etc)
			Switchhook flash detection:
			300-1200 ms

100D DSI	T-1 or PRI	n/a	Capacity: 24 lines/trunks
			for voice and analog data or 23
			lines/trunks for voice and data
			with 1 channel used for signaling.
			Mode: multiplexes 24 or 23
			line/trunks into 1 facility and
			demultiplexes 1 facility into 23
			or 24 lines/trunks
			speed: Up to 64 kbps
			Signalling: DS1 over 4-wire;
			T-1 uses robbed-bit or common
			channel; PRI has ISDN-PRI -
			(23B + 1 D)
400/TTR*	Loop-start	Power failure transfer	Capacity: 4 lines/trunks.
	and TTR	(PFT) telephone	4 TTRs. 1 PFT telephone
			Signaling: Loop-start
400 E&M	Tie trunk	n/a	Capacity: 4 tie lines
			Method of completion:
			automatic start, immediate-start.
			wink-start, or delay-did-start
			Signaling: E&M type IS.
			type 1C. type 5

400 GS/LS/TTR	Loop-start or	PFT telephone; button	Capacity: 4 lines/trunks,
	ground-start and	needed for ground-sun	4 TTRs, 1 PFT telephone
	TTR	PFT telephone	signaling: Loop-start or
			ground-start, optioned per port

MODULE