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Page 546 of 894 NT8D09 Analog Message Waiting Line card
553-3001-211 Standard 2.00 September 2004
service off-premise telephones, the NTAK92 Off-premise protection module
must be used. Check local regulations before providing such service.
Overload level
Signal levels exceeding +7 dBm applied to the tip and ring cause distortion in
speech transmission.
Environmental specifications
Table 176 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 108 on page 548 and
Table 109 on page 551 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.
Table 176
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)