AT&T 585-300-903 manual Data Rates for Switched RS-232 Using Data Modules For DCP

3-8Switched EIA RS-232 Networks

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AUDIX System Requirements for Switched RS-232 Using Data Modules For DCP

Each AUDIX system must be running R1V5 or later software and must be equipped with a TN539 or TN539B ACCE circuit pack and the AUDIX Networking Breakout cable (H600-331 Group 1 or 2).

Switch (or Customer) Requirements for Switched RS-232 Using Data Modules for DCP

Each AUDIX RS-232 channel to be converted to DCP requires a data module. The data module must be connected to a DCP port at the switch and should be located within 5 feet (1.524 meters) of the AUDIX system, so an M25A RS-232 extender cable is not needed. The distance from the data module to the switch should be no more than 5000 feet (1524 meters). The following is required:

∙One of the following data modules:

—For DCP mode 1 (56 Kbps, synchronous) or DCP mode 3 (64 Kbps, synchronous) use an MPDM/M1*. The MPDM/M1* operates in synchronous mode. An older MPDM can be upgraded to support 56 Kbps with D-kit D-181509. Install the D-kit by following the instructions included with the kit. These channels can only be used for incoming calls.

—For DCP mode 2, use a 7400A or 7400B DSU. The 7400A and 7400B operate in only asynchronous mode. These channels can be used for incoming or outgoing calls.

∙One D8W-87 modular cord (provided with the data module) is required for each module.

∙Switch DCP interface:

—System 75, Generic 1, and Generic 3: TN754 Digital Line Circuit

—System 85 and Generic 2 traditional module: SN270B General Purpose Port

—System 85 and Generic 2 universal module: TN754

If the converted channels are to be used for DCP Mode 2 operation, two modem pool pairs are also required. See Chapter 5, DCP Mode 2 Networks — Modem Pooling. Access to two additional channels on the interlocation facilities might also be required.

Data Rates for Switched RS-232 Using Data Modules For DCP

Data rates are limited to the capabilities of the data modules. MPDM/M1* data modules operate at 56 or 64 Kbps (synchronous), but they do not support dialing out at these speeds, so the converted channels would be limited to receiving calls only. In some cases this limitation would not create a problem. In cases where it would, the 7400A data module, which supports incoming and outgoing calls, can be used. However, with the 7400A, communication is performed at low speeds (up to and including 19.2 Kbps, asynchronous).