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3-2 Switched EIA RS-232 Networks
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SWITCHED RS-232 USING MODEMS
When a dedicated RS-232 network requires more than three AUDIX systems, or any time two systems are
separated by a distance greater than two data sets can support, a switched RS-232 network must be formed.
Modems convert the RS-232 signal into an analog signal for transmission through the switch to a colocated
AUDIX system, or out of the switch across the public/private facilities to another switch.
Figure 3-1, Dedicated and Switched RS-232 Network for a Single Switch, shows four AUDIX systems
serving the same switch. Notice that in this example there is a mixture of dedicated and switched
connections. Incorporating two dedicated connections into this setup saves the customer the price of four
modems. Whether this is a viable setup depends on the network usage between all systems.
If the network requires switched access to all RS-232 channels, the network would look like Figure 3-2,
Switched RS-232 Network for a Single Switch.
Figure 3-3, Switched RS-232 Network for Separate Locations, shows three AUDIX systems serving
switches at different locations. This setup also presents a mixture of dedicated and switched connections.
The assumption is that the two systems serving the same switch will have much more use for a network
connection, so a dedicated connection is provided. For the occasional connection to/from the other site, a
switched connection is used.
If Call Detail Recording is required, a PC can be included in a switched RS-232 network using a spare
dedicated RS-232 connection or through a switched RS-232 connection. Figure 3-4, Switched RS-232
Network for Separate Locations and a PC, shows a switched connection. The PC has dial-up access to any
AUDIX system in the network.