AT&T 585-300-903 manual Dedicated EIA RS-232 Networks, Considerations, General Information

2. Dedicated EIA RS-232 Networks

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AUDIX networking can be implemented using a dedicated Electronic Industries Association (EIA) RS-232 interface. This chapter presents dedicated RS-232 configurations supported by AT&T. These examples show AUDIX using RS-232 at both ends. For networks with RS-232 and DCP mixed, see Chapter 7, Mixtures of RS-232 and DCP Networks.

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 configurations presented here is accompanied by the equipment required for the AUDIX systems.

NOTE

System 75, DEFINITY Generic 1, Generic 3, and MERLIN II can access only two of the four DCP channels. This is a limitation regardless of the AUDIX software used and the networking circuit pack provided. When mixing the two DCP channels with the two RS-232 channels, a maximum of four channels can be provided for these switches. An AUDIX system installed with a System 85 or a DEFINITY Generic 2 can provide access to six channels in this manner.

AUDIX R1V3, R1V4, and R1V5 software limit the number of simultaneously active channels to four. To use all six channels simultaneously, an AUDIX system must have R1V6 or later software and a TN539 vintage 7 or TN539B ACCE.

CONSIDERATIONS

If a customer is considering using dedicated RS-232 connections in their AUDIX network, keep the following in mind:

∙Only local networking configurations are supported.

∙A maximum of three AUDIX systems can be networked via this method.

∙AUDIX software must be R1V5 or later.

∙The customer needs a TN539 or TN539B networking board.

∙This type of network can operate at speeds up to 64 Kbps (depending on distance).

GENERAL INFORMATION

Figure 2-1, Dedicated RS-232 Network of Two AUDIX Systems, shows two AUDIX systems networked using dedicated RS-232 connections. The transmission schedules (that is, the times set up for one system to connect to another for the purpose of transmitting messages) can be set so the systems will not attempt to use the channel at the same time. If they do attempt simultaneous transmissions, the system denied access

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