Nortel Networks 553-3001-211 manual Overload level, Environmental specifications

Page 546 of 894 NT8D09 Analog Message Waiting Line card

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.

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)

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.

553-3001-211 Standard 2.00 September 2004