Page 558 of 906 NT8D09 Analog Message Waiting Line card553-3001-211 Standard 3.00 August 2005Overload levelSignal levels exceeding +7 dBm applied to the tip and ring cause distortion inspeech transmission.Environmental specificationsTable 181 lists the environmental specifications for the analog messagewaiting line card.Connector pin assignmentsThe analog message waiting line card brings the 16 phone lines to the IPEbackplane through a 160-pin connector shroud. The backplane is cabled to theI/O panel on the rear of the module, which is then connected to the MDF by25-pair cables.Telephone lines from station equipment cross connect to the analog messagewaiting line card at the MDF using a wiring plan similar to that used for trunkcards. A typical connection example is shown in Figure 111 on page 560 andTable 112 on page 563 shows the I/O pin designations at the backplaneconnector. This connector is arranged as an 80-row by 2-column array ofpins. Normally, these pin positions are cabled to 50-pin connectors at the I/Opanel in the rear of each module for connection with 25-pair cables to thecross-connect terminal.The information in Table 182 on page 559 is provided as a reference anddiagnostic aid at the backplane, since the cabling arrangement may vary at theI/O panel. See Communication Server 1000M and Meridian 1: Large SystemTable 181Analog message waiting line card – environmental specificationsParameter SpecificationsOperating temperature 0° to +60° C (+32 to +140° F), ambientOperating humidity 5 to 95% RH (non-condensing)Storage temperature –40° to +70° C (–40° to +158° F)
