Configuration 709
Port B pads Universal Trunk
Pads Port-to-port loss (dB)
Port B Transmit
DtoA Receive
AtoD Transmi
DtoA Receive
AtoD
Port B to
Universal
trunk
card
Universal
trunk
card to
Port B
PE CO/FX/WATS
(TRC) Out Out In In 11
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 factorslisted 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 TransmissionCompensated (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 fora 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.
Nortel Communication Server 1000
Circuit Card Reference
NN43001-311 01.04 Standard
Release 5.0 23 May 2008
Copyright© 2003-2008, Nor tel Networks
.