Endpoint Communications Features; Pri Applications - AT&T MERLIN LEGEND Release 2.0 Equipment And Operations Manual

Data Communications Support

Endpoint Communications Features

The communications system supports the use of data equipment or data
software. These features are provided by the data station hardware/software in
the personal computer, data terminal, or communicating device, such as the
7500B Data Module or modem.
Data transport mode selection (for example, 7500B Data Modules
support DMI modes 0, 1, 2, and 3)
Data metering (speed matching) of bit rates between digital data
endpoints
Data terminal dialing
Automatic answering of data calls

PRI Applications

The communications system provides an interface between PRI services and
the small business customer. Some advanced digital applications are already
supported by the communications system, which is unique because it is the first
Key system to allow customers to use PRI services. These applications include
high-speed fax transmissions and Video Conferencing.
This section provides the configurations supported for fax transmissions on the
Group IV (G4) Fax machine and a general description of video conferencing
connections.
Fax Transmissions Application
The Group IV (G4) Fax machine is a fax unit, offering 400x 100 dots per inch
(DPI) in fine mode. It can operate at any speed for communications with a
Group Ill (G3) Fax machine or another Group IV (G4) Fax machine. When
speed is essential, it can transmit at 64 kbps and achieve speeds as fast as 3
seconds per page.
Supported Configurations
There are three ways to connect a Group IV (G4) Fax machine to the
communications system for transmitting and receiving data:
A Direct RS-232 Interface
An RS-232 to V.35 Interface Conversion
A Direct V.35 Interface
These connections are only a guide, not an assurance that different fax
machines with other proprietary interface connections also operate properly.
The configurations are based on compatibility testing that used Canon and
5-18 PRI Applications