Nortel Networks 1000 - Manual (Page 626)

626 NT8D14 Universal Trunk card
Table 238
Pad switching algorithm (cont’d.)
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
PE CO/FX/WATS
(TRC) Out Out In In 1 1
PE TIE Out Out In In 0.5 0.5
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.
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.
•
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.
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 trunks. The class of service determines the operation of the switchable
pads contained in each unit. They are assigned as follows:
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 02.06 Standard
27 August 2008
Copyright © 2003-2008 Nortel Networks
.