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Instruction Manual
48
with other devices. If you wish to use this feature through a PBX system,
it may require some experimentation and additional support from your
telecom services provider, and is not supported by StarTech.com.
Connecting a Modem
The SV441DUSBI will work with virtually any Hayes-compatible modem
that recognizes the standard AT command set. Some modem manu-
facturers offer “enterprise” grade modem products (at a premium price)
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 SV441DUSBI.
It is important to note that modems that offer “56K” (or 57,000 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 57,000 bps do
not indicate a problem with the modem or the SV441DUSBI, 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 is con-
nected. It requires the use of a null modem serial cable.
Modem Connection