2.3 Available ISDN BRI Extension Configurations

You have to know the way of connection of your ISDN devices in order to configure your 2N^® BRI Enterprise / BRI Lite GSM gateway correctly. For information on your ISDN type, check your ISDN extension provider's registration form or contact your telephone network administrator.

Point-to-Point Configuration

The Point-to-Point (EuroISDN with DDI) configuration interconnects directly one ISDN terminal (TE) and a network terminal (NT) (see the figure below). This type is applied mainly where PBXs are connected to the ISDN.

Point-to-Multipoint Configuration

Point-to-Multipoint (EuroISDN with MSN) is another type of ISDN terminal interconnection. Here the network terminal (NT) is interconnected with up to eight ISDN terminals through a 4-wire passive bus as shown in the figure below.