For ease of installation and to promote the widest possible range of applications, all T-311 connectors are standard and modular. The T-311 offers 5 external interfaces for connections to:

	Audio source via 5-pin DIN connector
	Audio headset via 4-wire modular jack
	Telephone set via RJ-11 or RJ-14 modular jack
	Telephone line via RJ-11 or RJ-14 modular jack
	Computer via DB-9 serial interface

The T-311 includes five front-panel status LEDs to identify current activity.

Electronic Voice

By controlling an audio source such as a recorded tape player or speech synthesizer, the computer can use the T-311 to send messages to the called party, or record messages received over the phone line.

Audio Headset

When used with a headset, the T-311 becomes a powerful and efficient "computerized telephone" for telemarketing and similar applications, relieving the user of most of the mechanics of setting up, dialing, and disconnecting calls.

The headset should meet the following requirements:

	UL and CSA approval
	Electret-type microphone (typically battery or AC powered)
	external amplifier with volume control
	modular four-wire connector (plugs into front of T-311)

Note: Headsets with telephone-like features duplicate some of the functions of the T-311 and may require additional programming.

Telephone Interface

A telephone connected to the T-311 can be used two ways:

	As an auxiliary telephone sharing the line with the T-311. In this mode, outgoing calls are dialed from the telephone set directly over the telephone and do not go through the T-311 circuitry.
	Operating through the T-311. In this mode, outgoing calls are dialed from the computer. This mode is identical to operation with a headset.

Computer Interface

The industry-standard AT command set is used where applicable for communication between the computer and the T-311.

The T-311 offers a selectable baud rate from 300 to 9600 bps. This defines the speed with which ASCII data is transferred between the computer and T-311. It does not refer to the rate of data transmittal across the telephone lines.