HP 200 Series Services And Applications page 217

Improving Network Availability
Sample Networks
Sample Networks
The following sections show some of the applications for switched circuits
and the methods for using circuit-switching networks on HP routers.
Low-Volume, Infrequent Transmissions
Figure 11 shows a network in which the traffic volumes are low and
transmissions are infrequent. End-of-business-day transmissions to update
databases is an application that may have only modest data transmission
requirements. In this scenario, several (or many) sites are networked to a
central site using switched services.
a
e
b
CIRCUIT
SWITCHING
NETWORK
d
c
Figure 11. Routing Using Switched Network Services
The switched circuits at the remote sites are configured as primary circuits.
The switched circuits at the central site are pool circuits. Note that there are
more remote circuits than there are central-site circuits. The balance
between remote-site dial-access circuits and central-site access circuits is
determined by the frequency of access and by users' tolerance for waiting
for an available access circuit. Switched circuits at the central site may be
configured (by the Telco/PTT) within a hunt group (also known as a rotary),
in which the remote sites dial a single number and obtain the first available
circuit.
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