Avaya Nortel Communication Server 1000 Reference page 428

NT8D14 Universal Trunk card
"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 (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 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:
• 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 180: Pad switching algorithm
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 180: Pad switching algorithm
Port B
IPE line
Universal trunk
(TRC)
IPE TIE (VNL)
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 Universal trunk card).
Receive is to the system from the external facility (analog-to-digital direction in the
Universal trunk card).
428 Circuit Card Reference
on page 428 for the pad switching control for the
Port B pads
Transmit Receive
D to A A to D
N/A N/A
In Out
In In
Comments? infodev@avaya.com
Universal Trunk
Pads
Transmit Receive
D to A A to D
Out Out
In Out
Out Out
Port-to-port loss (dB)
Port B to Universal
Universal trunk
trunk card to
card Port B
0.5 0.5
1 1
0 0
July 2011