Nortel Networks 553-3001-211 manual 640 of 894 NT8D15 E&M Trunk card

Page 640 of 894 NT8D15 E&M Trunk card

Note: * – CO ground start: the trunk is idled and the network taken down, but the incoming tie trunk is controlled by the originating end.

Electrical specifications

Table 197 lists the electrical characteristics of the trunk interface on the E&M trunk card.

Table 197

Electrical characteristics of E&M trunk cards

Characteristic	4-wire trunk	2-wire trunk
Signaling range	Type I 150 ohms	Type I 150 ohms
	Type II 300 ohms
	loop
Signaling type	Type I, Type II	Type I
Far-end battery	–42 to –52.5 V dc	–42 to –52.5 V dc
Near-end battery	–42.75 to –52.5 V dc	–42.75 to –52.5 V dc
Ground potential difference	+10 V dc	+10 V dc
Line leakage between E lead	Š20K¾	Š20K¾
and ground
Effective loss	See pad table (Table 204 on	See pad table (Table 204 on
	page 650)	page 650)
Terminating impedance	600 ohms	600 ohms
Balance impedance	N/A	600 ohms

Table 198

Electrical characteristics of trunk cards (Part 1 of 2)

Characteristic	DID Trunk	CO trunk
Nominal impedance	600 or 900 ohms, (selected	600 or 900 ohms, (selected
	by software)	by software)
Signaling range	2450 ohms	1700 ohms

553-3001-211 Standard 2.00 September 2004