StarTech.com MATRIX SV3254DX4I - Manual (Page 52)

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Using the Modem feature
NOTE: Requires an RJ45 to DB9 adapter. Please see StarTech.com
part number(s): GC98FF (DB9 Female to RJ45 Female Adapter) or
GC98MF (DB9 Male to RJ45 Female) as applicable.
Background
The modem feature allows the SVxx54DX4I to act as an Internet
connection server for increased security and flexibility in connecting with
the host computer.
Unlike the TCP/IP connection used with the standard Web configuration
and VNC clients, the modem creates a one-to-one connection between
the SVxx54DX4I and the computer you are using to manage the host
computer that is essentially private, as it bypasses the public Internet
completely.
Please note that this feature requires both an external modem (most
standard connection protocols are supported) and a dedicated phone
line that can be connected to the modem for external access. While
it is possible to use the modem feature through some PBX systems,
this increases the complexity and reduces the performance of the
connection. For clarity, the instructions presented here assume that the
modem is connected to a typical POTS (plain old telephone system)
line that is not routed through a phone management system or shared
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.