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5. DCP Mode 2 Networks — Modem Pooling
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AUDIX networks can be implemented using AT&T’s Digital Communications Protocol (DCP) Mode 2.
This type of network is only used when the AUDIX systems to be networked are not colocated and,
therefore, require some type of interlocation facility to pass data. This arrangement makes use of the
switch’s modem pool or can be implemented using stand-alone modem pools. This chapter presents
supported configurations. The examples show the AUDIX system using DCP at both ends. See Chapter 7,
Mixtures of RS-232 and DCP Networks, for RS-232/DCP combinations.
If a customer develops their own method, contact the Business Communications Systems Design Center
(BCSDC) to make sure it is feasible. Each of the examples presented here is accompanied by the
equipment required for the AUDIX systems and for the switches that the AUDIX systems serve.
CONSIDERATIONS
If a customer is considering using DCP Mode 2 connections in their AUDIX network, keep the following in
mind:
• Only remote networking configurations are supported.
• Two or more AUDIX systems can be networked via this method.
• AUDIX software must be R1V3 or later.
• The customer needs a TN366, TN366B, TN539, or TN539B networking board.
• Transmission in this type of network is full-duplex or half-duplex, synchronous or asynchronous, at
speeds up to 9600 bps.
• The customer will need rack-mounted or standalone modem pool.
NOTE
System 75 and DEFINITY Generic 1 and Generic 3 can be set up to access only two of the
four DCP channels. This is a limitation regardless of the AUDIX software used and the
networking circuit pack provided. See Chapter 3, Switched EIA RS-232 Networks, for
information on expanding this limitation to four channels.
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