Nortel Networks Circuit Card 311 - Manual (Page 707)

Configuration 707
• TRC for a 2-wire non-VNL trunk facility with a loss of greater than 2
dB, or for which impedance compensation is provided, or for a 4-wire
non-VNL facility.
• NTC for a 2-wire, non-VNL trunk facility with a loss of less than 2 dB, or
when impedance compensation is not provided.
See Table 263 "Pad switching algorithm" (page 707) for the pad switching
control for the various through connections and the actual port-to-port loss
introduced for connections between the NT8D14 Universal Trunk card and
any other port designated as Port B.
Table 263
Pad switching algorithm
Port B pads
Universal Trunk
Pads
Port-to-port loss (dB)
Port B
Transmit
D to A Receive
A to D Transmit
D to A Receive
A to D
Port B to
Universal
trunk
card Universal
trunk
card to
Port B
IPE line N/A N/A Out Out 0.5 0.5
Universal trunk
(TRC) In Out In Out 1 1
IPE TIE (VNL) In In Out Out 0 0
Note 1: Transmit and receive designations are from and to the system. Transmit is from the system
to the external facility (digital-to-analog direction in the Universal trunk card). Receive is to the
system from the external facility (analog-to-digital direction in the Universal trunk card).
Note 2: When Port B is the call originating port. If the Universal trunk card is the originating port, the
UTC pads are out, the Port B (PE CO/FX/WATS) pads are in.
Loss parameters are selected on the 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:
• Class of Service (CLS) 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 not Via Net Loss (non VNL).
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright © 2003-2008, Nortel Networks
.