determined by the three factors listed below (the first two are under direct user control; the third
is controlled indirectly):
• Class of Service is assigned in LD 14.
• Facility termination is selected (2-wire or 4-wire) in LD 14 (the 2-wire setting provides 0.5
dB more loss in each direction of transmission for echo control).
Note:
Facilities associated with the Nortel Electronic Switched Network (ESN) are
recommended to be 4-wire for optimum transmission; so, the 4-wire setting is generally
referred to as the ESN setting. However, the 4-wire setting is not restricted to networks
using the ESN feature. Conversely, the 2-wire setting, often called non-ESN, can be
used on certain trunks in an ESN environment.
• 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 CLS prompt by typing VNL. The non-VNL class of
service is assigned at the CLS prompt by typing TRC (Transmission Compensated) or NTC
(Non-Transmission Compensated).
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.
Table 194: Pad switching algorithm
on page 458 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.
on page 459 shows the pad switching orientation.
Table 194: Pad switching algorithm
Port B
Port B pads
E and M Trunk Pads
Port-to-port loss (dB)
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
NT8D15 E and M Trunk card
458 Circuit Card Reference
July 2011
Summary of Contents for 1000 Series
Page 1: ...Circuit Card Reference Nortel Communication Server 1000 7 0 NN43001 311 04 04 July 2011 ...
Page 20: ...20 Circuit Card Reference July 2011 ...
Page 30: ...Introduction 30 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 116: ...Option settings 116 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 143: ...Figure 25 CP PIV card front Physical description Circuit Card Reference July 2011 143 ...
Page 148: ...NT4N39AA CP Pentium IV Card 148 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 287: ...Figure 86 Clock Controller Option 3 Operation Circuit Card Reference July 2011 287 ...
Page 302: ...NT5K21 XMFC MFE card 302 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 346: ...NT6D80 MSDL card 346 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 353: ...Figure 96 NTDK16 DLC Functional description Circuit Card Reference July 2011 353 ...
Page 461: ...Figure 147 Paging trunk operation Applications Circuit Card Reference July 2011 461 ...
Page 462: ...NT8D15 E and M Trunk card 462 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 500: ...NTAK09 1 5 Mb DTI PRI card 500 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 512: ...NTAK10 2 0 Mb DTI card 512 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 534: ...NTAK79 2 0 Mb PRI card 534 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 550: ...NTBK22 MISP card 550 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 560: ...NTBK50 2 0 Mb PRI card 560 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 595: ...Figure 165 MGC block diagram Introduction Circuit Card Reference July 2011 595 ...
Page 662: ...NTRB21 DTI PRI DCH TMDI card 662 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 668: ...NTVQ01xx Media Card 668 Circuit Card Reference July 2011 Comments infodev avaya com ...
Page 700: ......