
Configuring Dial Services
1-16
Using the Same Lines for Different Line Pools
You can use the same physical line for a demand, backup, and bandwidth-on-
demand pool. For example, if the router is not using a line for a dial-on-demand
connection, the router can use it for a dial backup connection.
You can tell if several pools use the same line because a combination of the letters
D (demand), B (backup), and W (bandwidth) appears next to the connector name
in the Configuration Manager window.
Network Access Methods and Services
There are three ways for the router to access a switched network:
• Integrated ISDN Interface — A Basic Rate Interface (BRI) or Primary Rate
Interface (PRI) that provides digital connectivity from the router to the
destination device, replacing standard analog phone lines. Using signals on an
ISDN line, the router instructs the network to set up a call to a particular
destination.
ISDN eliminates the need for dial devices such as modems, because you no
longer need to convert digital signals to analog. An ISDN network also allows
you to send data, voice, and video over the same digital line.
• Raise DTR — A signaling method that enables access to the network by
preprogramming the destination phone numbers into the dial device (modem,
DSU, or ISDN terminal adapter). Raise DTR signaling works with any of
these interfaces: X.21, V.35, RS-232, and RS-422.
• V.25bis — A signaling method that enables access to the network by passing
the destination phone numbers from the router to the dial device (modem,
DSU, or ISDN terminal adapter). This method lets the dial device support dial
connections to multiple destinations. V.25bis signaling works with any of
these interfaces: X.21, V.35, RS-232, and RS-422.
The method you choose depends on your application, your network resources, and
the type of network to which you are connecting. ISDN, a complex networking
technology, requires further explanation. Refer to Chapter 2 for more information.
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