AT&T System 85 manual Power

8400B Plus Data Module

voice call origination from your PC using the ATDP command (however, these calls must be terminated manually).

Data metering which allows the data module and associated terminal to operate at higher speeds than the far-end data point.

Supports the semicolon modifier which enables an automatic return to the command mode after dialing a data call.

Speakerphone Activation before Dialing

For terminal dialed voice calls, you can delay speakerphone activation until after a call is dialed. You would not hear touch tones or dial tone in this case.

Power-up self-test

Local and remote loopback tests with test duration timer

Voice terminal powered by the PBX is not affected if AC power is removed from the 8400B Plus data module.

Data features for host or terminal applications include:

EIA/RS-232-D DCE interface

Hayes SMARTMODEM 2400 user interface emulation

Power

An AT&T power supply unit is shipped with each 8400B Plus data module. This unit connects to a grounded AC outlet, and provides a connection between the PBX wall jack and the 8400B Plus data module. The power supply unit provides the necessary operating voltages for the 8400B Plus data module.

Setting Options

There are 28 S-registers in the 8400B Plus data module. Twenty-two S-registers are used to store configuration parameters; one is used to store installation options, and the remaining five are unused. Eleven registers can be stored in nonvolatile memory, which will be restored when the unit is powered up. There are two sets of stored registers, or profiles. When the 8400B Plus is first powered on, the values that were last stored in the S-registers are the values in effect until AT commands are issued to change them.

You can check the current value stored in all S-registers with the &V command. To look at the contents of just one register, use the command Smm? where ‘‘mm’’ is the number of the S-register. The data module will return 3-digits, representing the decimal value of the specified S-register.

To change the value in any one S-register directly, use the command Smm=nnn where ‘‘mm’’ is the number of the S-register and ‘‘nnn’’ is the number you wish to place in the register.

For a full description of all 28 S-registers, see Appendix C in the 8400B Plus Data Module User’s

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