Nortel Networks Circuit Card Manuale Utente

 NT5D33 and NT5D34 Lineside E1 Interface cards

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 63. Audible Message Waiting Indicator can be 
provided as well.

Similarly, use the LEI to provide a connection between the system and a 
remote Norstar system. See Figure 64 on 

. 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.