AT&T System 85 manual General Information

GENERAL INFORMATION

The following data equipment is available with DEFINITY G1, G2, G3, System 75, and System 85:

7400A Data Module—In DTE mode, works with asynchronous DCE in the modem pool at data rates of 0.3-19.2 kbps, full-duplex. Supports both Hayes-compatible and D-lead modems. In DCE mode, the 7400A has Hayes®, Keyboard Dial or Answer-Only interface. Also works with asynchronous DTE where rack mounting is needed. Takes the place of MTDM or MPDM in asynchronous applications.

7400B and 7400B Plus Data Modules—Works with asynchronous DTE at data rates of 0.3-19.2 kbps, full-duplex. Can be used with most 7400-series DCP voice terminals for simultaneous voice/data or standalone. Emulates a Hayes-compatible modem, there- fore, can be used with standard PC communications packages. Takes the place of previ- ous DCP asynchronous data stands.

Modular Processor Data Module (MPDM)—Works with synchronous DTE at data rates of 0.3-64 kbps. Also works at full- or half-duplex with internal or external timing at the appropriate data rates. Supports V.35, RS-232, and RS-449 interfaces and RS-366 Automatic Calling Unit interface at the previously mentioned rates. Video codes are an example of 56 or 64 kbps endpoints where calls are set up via the RS-366 interface. The MPDM also supports asynchronous applications, but the 7400B Plus supersedes it for applications requiring Hayes emulation and the 7400A supersedes it for remaining asyn- chronous applications.

Modular Trunk Data Module (MTDM)—Works with a synchronous DCE in modem pool applications at data rates of 0.3-19.2 kbps. Also works at full- or half-duplex with internal or external timing at the appropriate synchronous data rates. The 7400A supersedes it for asynchronous applications.

7500B Data Module—Works with asynchronous or synchronous DCE or DTE on BRI switch interface (DEFINITY G2 or 5ESS® switch only). Supports RS-232 and V.35 inter- faces and RS-366 Automatic Calling Unit interface (for the RS-232 interface only).

ISDN Asynchronous Data Module (ADM)—Works with asynchronous DTE as a data stand for 7500-series BRI phones (DEFINITY G2 and 5ESS switch only). Supports Hayes command set for compatibility with PC communications packages.

Definity High Speed Link—Works with synchronous V.35 DTE at data rates of 56 kbps half or full duplex or 64 Kbps full duplex. Supports Permanent (private line type) calls and switched calls. Switched calls can be set up using either the RS-366 or RS-232 (Hayes ATD command) interface; via DTR or Hotline dialing; or manually using the front panel call control feature. Replaces the ACCUNET® MPDM for video, LAN, CC/FEP and other high speed applications.

Asynchronous Data Unit (ADU)—Works with asynchronous DTE at data rates of 0.3-

19.2kbps. Used where the user has an analog voice phone and needs basic capabilities for asynchronous terminals as opposed to PCs. Connects to SN 238 (System 85 and DEFINITY G2 traditional modules) or TN726 (System 75 and DEFINITY G1 and G2 universal modules).

Multiple Asynchronous Data Unit (MADU)—Works with asynchronous DTE at data rates of 0.3-19.2 kbps in host applications. The MADU is rack-mounted and supports busy-out. It connects to the same switch ports as the ADU.

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