Nortel Networks 553-3001-211 manual Electrical specifications, CO / FX / Wats Did / TIE RAN

NT8D14 Universal Trunk card Page 597 of 894

Electrical specifications

Table 180 gives the electrical characteristics of the NT8D14 Universal Trunk card.

Table 180

Universal trunk card – trunk interface electrical characteristics (Part 1 of 2)

		Trunk Types
Characteristic	CO / FX / WATS	DID / TIE	RAN	Paging
Terminal impedance	600 or 900 ohms	600 or 900 ohms	600/900 ohms	600 ohms
	(Note 1)	(Note 1)	(Note 1)
Balance impedance	600 or 900 ohms	600 or 900 ohms	N/A	N/A
	(Note 1),	(Note 1),
	3COM, or 3CM2
		3COM, or 3CM2
	(Note 2)
		(Note 2)
Supervision type	Ground or	Loop start	Continuous, level, or	N/A
	loop start	(with ans sup)	pulse
	(Note 3)	(Note 3)
DC signaling loop	1700-ohm loop with	2450-ohm loop with	600/900-ohm loop	600 ohm
length (max)	near-end battery of	near-end battery of		loop
	–42.75 V	–44 V
Far-end battery	–42 to –52.5 V	–42 to –52.5 V	–42 to –52 V	N/A
	(Note 4)
Minimum detected	20 mA	10 mA	10 mA	N/A
loop current
Ground potential	±3 V	±3 V	±1 V	±1 V
difference
Low DC loop	<300 ohms	N/A	N/A	N/A
resistance during
outpulsing
High DC loop	Ground start	N/A	N/A	N/A
resistance	Š 30k ohms;
	loop start
	Š 5M ohms

Circuit Card Description and Installation