Table 264 pad switching algorithm – Nortel Networks Circuit Card 311 User Manual
Page 708
708
NT8D14 Universal Trunk card
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 trunks. The class of service determines the operation of the switchable
pads contained in each unit. They are assigned as follows:
•
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 264 "Pad switching algorithm" (page 708)
for the pad switching
control for the various through connections and the actual port-to-port loss
introduced for connections between the Universal trunk card and any other
IPE or PE port designated as Port B.
Table 264
Pad switching algorithm
Port B pads
Universal Trunk
Pads
Port-to-port loss (dB)
Port B
Transmit
D to A
Receive
A to D
Transmi
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
PE line
N/A
N/A
Out
Out
1
1
Note 1: Transmit and receive designations are from and to the Meridian 1. Transmit is from the
Meridian 1 to the external facility (digital-to-analog direction in the Universal trunk card). Receive is
to the Meridian 1 from the external facility (analog-to-digital direction in the Universal
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.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
01.04
Standard
Release 5.0
23 May 2008
Copyright © 2003-2008, Nortel Networks
.