Nortel Networks 553-3001-211 manual LEI in off-premise extension application

NT5D33 and NT5D34 Lineside E1 Interface cards Page 299 of 894

Meridian 1 can send a call to the VRU, and, because the LEI supports analog (500/2500-type) telephone functionality, the VRU is able to send the call back to the system for further handling.

The LEI can also be used to provide off-premise extensions to remote locations, up to 500 miles from the system. In this application, analog telephone functionality is extended over E1 facilities, providing a telephone at a remote site with access to analog (500/2500-type) telephone line functionality. See Figure 60. Audible Message Waiting Indicator can be provided as well.

Figure 60

LEI in off-premise extension application

Similarly, use the LEI to provide a connection between the system and a remote Norstar system. See Figure 61 on page 300. In this case, channel banks are not required if the Norstar system is equipped with an E1 interface.

Note: Consider LEI audio levels when determining the appropriateness of an application.

Circuit Card Description and Installation