Nortel Networks Circuit Card - Manual (Page 558)

Page 558 of 906 NT8D09 Analog Message Waiting Line card
553-3001-211 Standard 3.00 August 2005
Overload level
Signal levels exceeding +7 dBm applied to the tip and ring cause distortion in
speech transmission.
Environmental specifications
Table 181 lists the environmental specifications for the analog message
waiting line card.
Connector pin assignments
The analog message waiting line card brings the 16 phone lines to the IPE
backplane through a 160-pin connector shroud. The backplane is cabled to the
I/O panel on the rear of the module, which is then connected to the MDF by
25-pair cables.
Telephone lines from station equipment cross connect to the analog message
waiting line card at the MDF using a wiring plan similar to that used for trunk
cards. A typical connection example is shown in Figure 111 on
page 560 and
Table 112 on page 563 shows the I/O pin designations at the backplane
connector. This connector is arranged as an 80-row by 2-column array of
pins. Normally, these pin positions are cabled to 50-pin connectors at the I/O
panel in the rear of each module for connection with 25-pair cables to the
cross-connect terminal.
The information in Table 182 on page 559 is provided as a reference and
diagnostic aid at the backplane, since the cabling arrangement may vary at the
I/O panel. See Communication Server 1000M and Meridian 1: Large System
Table 181
Analog message waiting line card – environmental specifications
Parameter Specifications
Operating temperature 0° to +60° C (+32 to +140° F), ambient
Operating humidity 5 to 95% RH (non-condensing)
Storage temperature –40° to +70° C (–40° to +158° F)