Chapter Two: Getting Started | 3. Choose a connection protocol 20 |
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3. Choose a connection protocol
The usage of the ISDN link is governed by the type of connection protocol you choose. The connection protocol defines the rules by which ISDN channels are enabled and disabled. The type of protocol you choose to use depends on the type of connections you plan to make.
Important ISDN concepts
Before you can decide on a connection protocol, you must become familiar with the following ISDN concepts.
ISDN channels
ISDN lines are defined in terms of channels, with each channel supporting a specific type of communication. The DIVA LAN ISDN Modem supports two ISDN channel types:
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ISDN access interfaces
An access interface is the physical connection between you and an ISDN network. It defines the number of D- and
Each ISDN
ISDN channel usage
The following diagram shows all the potential connections a DIVA LAN ISDN Modem could make, if it was configured to support an Internet connection, a corporate network connection, incoming data calls, and analog calls on both PHONE ports.
Internet Connection
Corporate Network Connection
Incoming Data Call Connection
PHONE port #1
PHONE port #2
ISDN BRI Line
1st
2nd
All connections, both data and voice, are carried on the
Connections are mapped as follows:
•PHONE port 1 always uses the first ISDN phone number (and SPID).
•PHONE port 2 always uses the second ISDN phone number (and SPID).
•To help avoid conflicts, the DIVA LAN ISDN Modem always tries to establish data connections using phone number 2 first, in an attempt to leave PHONE port 1 free. Of course, if phone number 2 is in use, the data connection is established using phone number 1.
•When an analog or data connection is established, the first available ISDN
