AT&T AT&T manual Dtmf, Ren

Port Specifications (Contd)

VOICE TERMINAL PORTS

STATION	TYPE	CIRCUIT PACK		SPECIFICATIONS
Tip and Ring		Tip Ring Line	● l-Pair		Interface			(Tip	and		Ring)
Single-Line	Sets	(ZTN78)
			● Analog		signals			modulated			over DC
(Analog)
			loop
			● Loop	Voltage:				24 V	dc
			● Signaling:			Dual		Tone	Multifrequency
			(DTMF)			only
			● REN	(max.):			1.2
			● DC Current				(max.): 35			mA
			● Loop	Range (24 AWG ): 2,000 feet
			● In-building service only
Tip and Ring		Analog Line	● I-Pair Interface (Tip and Ring)
Single-Line	Sets	(TN742)
(Analog)			● Analog		signals			modulated			over DC
			loop
			● Loop	Voltage:				48 V	dc
			● Signaling: Dual Tone							Multifrequency
			(DTMF)			only
			● REN	(max.):			5.0
			● DC Current				(max.): 40			mA
			● Loop	Range (24 AWG): 24,000 feet
			● Supports			Out-of-Building,					Extended
			(greater than 2000 feet), Off-Premises
			and	Bridged			Station		services
			(maximum of five bridged stations,
			and	two		off-hook simultaneously).

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