AT&T 585-300-903 manual DCP Mode 1 Networks 56 Kbps, Considerations

4. DCP Mode 1 Networks — 56 Kbps

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AUDIX networks can be implemented using AT&T’s Digital Communications Protocol (DCP) Mode 1. This type of network is only used when the AUDIX systems to be networked are not colocated and, therefore, they require some type of interlocation facility to pass data. (For local networking, see Chapter 6, DCP Mode 3 Networks — 64 Kbps.) This chapter presents supported 56 Kbps configurations; all other 56 Kbps configurations must be designed by Custom Development.

The examples show an AUDIX system using DCP at both ends. See Chapter 7, Mixtures of RS-232 and DCP Networks, for RS-232/DCP combinations. Each of the examples presented in this chapter is accompanied by the equipment required for the AUDIX systems and for the switches that the AUDIX systems serve.

NOTE

Customers who implemented 56 Kbps networking using TN539 ACCE boards may wish to upgrade to AUDIX R1V7 software and a TN539B ACCE in order to take advantage of the performance improvements and built-in loop-around testing capabilities.

CONSIDERATIONS

If a customer is considering using DCP Mode 1 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 R1V5 or later. However, R1V7 software is recommended because of the networking feature enhancements and 56 Kbps loopback testing capabilities included in that load when a TN539B ACCE board is used.

∙AUDIX systems running R1V5 or R1V6 software require an MPDM/M1* for loopback testing. AUDIX R1V7 systems only require an MPDM/M1* if the two RS-232 ports are to be converted for 56 Kbps use.

∙The customer needs a TN539 or TN539B ACCE networking board; the TN539B is recommended because of the 56 Kbps loopback testing capabilities included in that load when AUDIX R1V7 software is used.

∙Transmission in this type of network is full-duplex, synchronous, at 56 Kbps.

∙The customer will need access to 56 Kbps robbed-bit facilities to a static or dynamic serving office (SO).

∙The customer will also need a DCP interface on the switch to connect with the AUDIX and a DS1 interface on the switch to connect with the 56 Kbps network.

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