HP 200 Series Services And Applications page 230

ISDN Wide Area Network Design: Dry Creek Joint Elem. School District
HP Routers
HP Routers
Initially, the district's network will be implemented as a bridged network
bridging IP. HP routers were selected for use in the Dry Creek design for the
following reasons.
1. HP routers can be supported on a standard contract with a guarantee
of 4-hour response time for repair.
2. HP routers support ISDN as of release 5.74.
3. The HP Router SR represents a lower-cost design when compared to
multiple bridges at the home site.
4. HP routers can support link speeds from 56 Kbit/s to T1, should
higher bandwidth be required in the future.
5. HP routers provide more complete troubleshooting capabilities—
NCL, statistics screens, and HP OpenView Network Management—
than do bridges.
With HP router operating system release 5.74 and later, ISDN can be
configured for manual or automatic operation. The automatic operation
provides for very sophisticated call control using the CCITT V.25 bis call-
connect protocol. The Dry Creek implementation uses point-to-point
connections that are semi-permanently established, requiring only simple
manual operation to be configured on the routers.
ISDN Configurations
ISDN is a switched/dialed technology and requires that one end point of a
point-to-point connection be configured to originate and that the other end
point be configured to answer. Each end point is assigned an ISDN
telephone number by Roseville Telephone Company. The configurations for
the routers and ISDN terminal adapters are shown here.
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