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Instruction Manual
50
Connecting a Modem
The SVxx53DXI will work with virtually any Hayes-compatible modem that
recognizes the standard AT command set. Some modem manufactur-
ers offer “enterprise” grade modem products that include technology to
improve the stability of connections; whether this type of product would
be beneficial to your application depends on whether you consider the
modem connection to be mission-critical, the quality of your telecom
infrastructure, and your budget for implementing this solution. The model
of modem attached is essentially transparent to the SVxx53DXI.
It is important to note that modems that offer “56K” (or 56,000 bps) con-
nections often achieve connection speeds that are far lower than their
maximum capabilities. Given the limitations of telecom infrastructure
(many locations have yet to implement fully digital switching technol-
ogy, and still rely on older analog technology for some segments), the
maximum “upstream” transfer rate is limited to a maximum of 33,600 bps
between two modems; the “downstream” rate is often within a similar
range for a typical connection. Therefore, speeds below 56,000 bps do
not indicate a problem with the modem or the SVxx53DXI, but simply
reflect the line conditions at the time the connection is made.
The serial port can be used for serial port configuration when the modem