Table 280 "pad – Nortel Networks 1000 User Manual
Page 709
Configuration
709
•
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 280 "Pad switching algorithm" (page 709)
for the pad switching
control for the various through connections and the actual port-to-port loss
introduced for connections between the E and M Trunk card and any other
IPE port designated as Port B.
Figure 240 "Pad orientation" (page 710)
shows the pad switching
orientation.
Table 280
Pad switching algorithm
Port B pads
E and M 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
E and M
E and M to
Port B
IPE line
N/A
N/A
Out
In
2.5
3.5
Universal
trunk (TRC)
Out
Out
In
In
0
0
IPE TIE
(VNL)
In
Out
In
Out
0
0
Note: 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 E and M Trunk card). Receive is to the system
from the external facility (analog-to-digital direction in the E and M Trunk card).
Loss parameters are selected on the E and M trunk card by a switchable
pad controlled by Codec emulation software. For convenience in this
discussion, the pads settings are called "in" and "out." Pad settings are
determined by the three factors listed below: the first two are under direct
user control; the third is controlled indirectly.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311
02.06
Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.