8-13
Configuring Demand Routing for Primary ISDN Modules
ProCurve Secure Router ISDN Modules
3. The receiver gets the SETUP. If the receiver is available and ready, it rings
the phone and sends an ALERTING message to the switch.
4. The switch forwards the ALERTING to the caller.
5. The receiving ISDN modem sends a CONNECT message to the switch.
6. The switch forwards the CONNECT message to the caller.
7. The caller sends a CONNECT_ACK to the switch.
8. The switch forwards the CONNECT_ACK to the receiver.
9. The call is now connected.
ProCurve Secure Router ISDN Modules
ProCurve Networking offers two types of ISDN modules:
■ narrow modules for primary WAN connections
■ backup modules for backup WAN connections
Like other narrow modules, the primary ISDN modules fit into the narrow
slots on the front of the ProCurve Secure Router. The backup ISDN modules,
on the other hand, snap onto the top of narrow modules before those modules
are installed into the ProCurve Secure Router. Each narrow module contains
a backup port that is enabled for use when a backup module is snapped into
place. In fact, the two-port ISDN primary modules contain a backup port,
which means you can install a backup module on top of the ISDN primary
module.
Both primary and backup ISDN modules provide ISDN BRI connections.
However, there are some differences between the modules that may deter-
mine which type of modules you purchase for your company’s WAN. Some of
these differences are listed in Table 8-2.
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