User`s manual

4. Possible connection topologies of your ISDN equipment
4.1. Point-to-Point (euroISDN with DDI)
To be able to configure your ISDN GSM GATEWAY Lite you have to know the
connections of your ISDN equipment. The first option is the Point-to-Point connection
(euroISDN with DDI) as shown in fig. 13. You can recognise a line in the Point-to-Point
configuration easily because there is no ISDN telephone, modem, etc. connected to it.
ISDN
Net
Public
phone net.
NT 1
Local
phone
lines
ISDN sets
PBX
Telephone
Fig.13: Point-to-Point connection
4.2. Point-to-Multipoint (euroISDN with MSN)
Another option how to connect your ISDN equipment is Point-to-Multipoint. ISDN
telephones, modems, etc. can be connected directly to this ISDN line.
ISDN
net
Public
phone net.
NT 1
Local
phone
lines
ISDN sets
PBX
Up to 8 ISDN equipments
Telephone
Fig.14: Point-to Multipoint connection
Note: For details on the ISDN line type see the registration sheet of your ISDN provider or
contact your telephone network administrator.
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