Nortel NT1R20 Description page 215

Figure 54
LEI in off-premise extension application
Figure 55
LEI connection to Norstar system
NT5D33 and NTRB34 Line-side E1 Interface Cards
The LEI can also be used to provide off-premise extensions to remote
locations (up to 500 miles from the Meridian 1 system). In this application,
analog telephone functionality is extended over E1 facilities, providing a
telephone at a remote site with access to 2500-type line functionality (see
Figure 54). Audible message waiting indicator can be provided as well.
Similarly, use the LEI to provide a connection between the Meridian 1 and a
remote Norstar system (see Figure 55). In this case, channel banks would not
be required if the Norstar system is equipped with an E1 interface.
Note: Consider LEI audio levels when determining the appropriateness
of an application.
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Line cards Description