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Instruction Manual
44
Connecting a Modem
The CABCONS1716I will work with virtually any Hayes-compatible modem capable
of recognizing the standard AT command set. Some modem manufacturers oer
“enterprise” grade modem products that include technology to improve the stability
of connections; whether this type of product would be benecial 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 CAB
CONS1716I
It is important to note that modems that oer “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 CABCONS1716I, but simply reect the line conditions at the time the
connection is made.
The Serial port can be used for serial port conguration when the modem is connected.
It requires the use of a null modem serial cable.
Place the modem near the CABCONS1716I and an available telephone jack. Connect
the modem to the telephone jack, data cable, and power source according to the
instructions in its documentation. The opposite end of the modem’s data cable should
be a DB9 female serial connection. Connect that end of the cable to the Serial connection
on the rear panel of the CABCONS1716I.
Modem
Connection