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Connecting a Modem
The
Digital KVM via IP
will work with virtually any Hayes-compatible modem that recognizes the
standard AT command set. Some modem manufacturers 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
Digital
KVM via IP
.
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 but simply reflect the line conditions at the time the connection is made. The SERIAL
port on the rear panel must be used for the modem connection. It requires the use of a null modem
serial cable.
Place the modem near the
Digital KVM via IP
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
Digital KVM via IP
.
Configuring a Modem Connection on the
Digital KVM via IP
Most connections will work appropriately with the default settings on the
Digital KVM via IP
once the
feature is enabled. When you entered the Unlock code to enable the feature, the
Digital KVM via IP
created a new menu option to enable configuration of this feature.
Login to the Web interface as
Admin
. Click
Admin/Setup
from the top of the page and choose
Modem (PPP) setup
.
You will then be presented with the Modem Option menu (see above). Make the following changes to
enable and configure the modem connection.
Enable modem connections (PPP) via serial port/modem: select Enabled.
Baud rate to use (affects connection between us and the modem only): select 115200.