StarTech.com MATRIX SV3254DX4I - Manual (Page 53)

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Connecting a Modem
The SVxx54DX4I will work with virtually any Hayes-compatible
modem that recognizes the standard AT command set. Some modem
manufacturers 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
SVxx54DX4I.
It is important to note that modems that offer “56K” (or 56,000 bps)
connections 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 technology,
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 SVxx54DX4I, but simply