NT5D33 and NT5D34 Lineside E1 Interface cards Page 299 of 894
Circuit Card Description and Installation
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.