AT&T 585-300-903 manual DCP Mode 3 Networks 64 Kbps, Considerations

6. DCP Mode 3 Networks — 64 Kbps

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AUDIX networks can be implemented using AT&T’s Digital Communications Protocol (DCP) Mode 3. This arrangement can be used when the AUDIX systems are colocated (serving the same switch) or when they are at separate customer sites. This chapter presents supported local and remote networking 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 your customer develops their own method, contact the Business Communications Systems Design Center (BCSDC) to make certain 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 3 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 R1V3 or later. For remote configurations, R1V7 software is recommended because of the 64 Kbps loopback testing capabilities included in that load.

∙The customer needs a TN366, TN366B, TN539, or TN539B networking board. For remote configurations, the TN539B is recommended because of the 64 Kbps loopback testing capabilities included in that board.

∙Transmission in this type of network is full-duplex, synchronous, at 64 Kbps.

∙For remote configurations, the customer will need access to 64 Kbps public or private telephone network facilities; these should normally be a T1 carrier with DS1 services.

NOTE

System 75, DEFINITY Generic 1 and Generic 3, and MERLIN II 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, on information for expanding this limitation to four channels.

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