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3. Switched EIA RS-232 Networks
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AUDIX networks can be implemented using a switched Electronic Industries Association (EIA) RS-232
connection. Networks can also be implemented by converting the RS-232 channels into switched Digital
Communications Protocol (DCP) connections. This chapter presents supported configurations for both
methods. The examples show an AUDIX system using RS-232 at both ends. See Chapter 7, Mixtures of
RS-232 and DCP Networks, for RS-232/DCP combinations.
If your customer develops their own method, contact the Business Communications Systems Design Center
(BCSDC) to make sure the method is feasible. Each of the examples presented here is accompanied by the
equipment required for the AUDIX systems and for the switches the AUDIX systems serve.
CONSIDERATIONS
If a customer is considering using switched RS-232 connections in their AUDIX network, keep the
following in mind:
• Local or remote networking configurations are supported.
• Two or more AUDIX systems can be networked via this method.
• AUDIX software must be R1V5 or later.
• The customer needs a TN539 or TN539B networking board.
• In this type of network speeds can be up to 19.2 Kbps; speeds are limited by the modems or data
modules the customer chooses to use.
• The customer will need data modules or Hayes-compatible modems for each AUDIX channel to be
switched.
NOTE
System 75, DEFINITY Generic 1 and Generic 3, and MERLIN II can only access two of the
four AUDIX DCP channels. This is a limitation regardless of the AUDIX software used and
the networking circuit pack provided. Thus, conversion of the RS-232 channels to DCP
becomes of particular importance in these cases. When mixing the two DCP channels with
the two RS-232 channels, a maximum of four channels can be provided for these switches.
AUDIX installed with a System 85 or a DEFINITY Generic 2 can provide access to six
channels in this manner.
For a System 85 or Generic 2, AUDIX R1V3, R1V4, and R1V5 software limit the number of
simultaneously active channels to four. To use all six channels simultaneously with a System
85 or Generic 2, an AUDIX system must have R1V6 or later software and a TN539 vintage 7
or TN539B ACCE.
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