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If the Small Business Server system has a UPS connected up
to the server via serial interface, this means you probably only have one
serial port left to serve all of the modems you've identified for the
Small Business Server system.
To get around this, you'll need to look at multiport
serial adapters.
Multiport serial adapters usually add at least four
additional serial ports, and in many cases eight, to an Small Business
Server system.
Because an Small Business Server system very often needs
multiple modems, you should find a multiport serial adapter that you're
comfortable with and add this to your standard Small Business Server
system hardware configuration for nearly all of your clients.
In addition to mitigating the scarcity of serial ports,
most multiport serial adapters have built in processors that offload
processing overhead to the multiport serial adapter harware. This frees up
the Pentium class CPU to focus on processor intensive tasks, like running
a Microsoft Exchange Server or Microsoft SQL Server database on the Small
Business Server system.
Many vendors who've traditionally offered multiport serial
adapters are now also offering multiport modems. These boards actually
integrate multiple internal modems on a single PCI (or in some cases ISA)
expansion card. While these products with built-in modems can be useful,
bear in mind that you lose many of the advantages of external modems; in
particular, the ability to easily reset a "hung" modem without
rebooting the Small Business Server system.
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