Nortel Networks 553-3001-211 manual 610 of 894 NT8D14 Universal Trunk card

Page 610 of 894 NT8D14 Universal Trunk card

Table 189

Cable loop resistance and loss

				Cable loop loss (dB)
	Cable loop resistance (ohms)			(nonloaded at 1kHz)
Cable length	22 AWG	24 AWG	26 AWG	22 AWG	24 AWG	26 AWG
915 m (3000 ft.)	97	155	251	0.9	1.2	1.5
1524 m (5000 ft.)	162	260	417	1.6	2.0	2.5
2225 m (7300 ft.)	236	378	609	2.3	3.0	3.7
3566 m (11700 ft.)	379	607	977	3.7	4.8	6.0
5639 m (18500 ft.)	600	960	1544	5.9	7.6	9.4

Port-to-port loss configuration

Loss parameters are selected on the NT8D14 Universal Trunk card by a switchable pad controlled by codec emulation software. For convenience, the pads settings are called “in” and “out.” Pad settings are determined by the two factors listed below (the first is under direct user control; the second is controlled indirectly):

•Class of Service is assigned in LD 14 (under direct user control).

•Port-to-port connection loss is automatically set by software on the basis of the port type selected in LD 16; only the port type is set by the user (controlled indirectly).

The transmission properties of each trunk are characterized by the class of service assigned in LD 14. Transmission properties can be Via Net Loss (VNL) or non-Via Net Loss (non-VNL).

The VNL class of service is assigned at the prompt CLS with the response VNL. The non-VNL class of service is assigned at prompt CLS by selecting either the Transmission Compensated (TRC) or Non-Transmission Compensated (NTC) response.

Non-VNL trunks are assigned a TRC or NTC class of service to ensure stability and minimize echo when connecting to long-haul trunks, such as Tie

553-3001-211 Standard 2.00 September 2004