Barrett 923 HF fax and data systems give new power to HF radio
providing HF network stations access to Internet email and fax
facilities either directly via the international telephone network or
through common email systems such as CCMail and MSmail.

Barrett 923 fax and data systems are ideal for the provision of full
telecommunications facilities within organisations that have many
remotely sited operations. After the initial capital equipment cost,
which is comparable with current satellite systems, there are no
ongoing time charged costs.

The 923 software package provides a simple interface between HF
network stations and the international telecommunications network. In
its simplest form the 923 software can be configured to only allow
the user access to a mail box. The 923 mail box operates in a similar
manner to those found in currently available email packages.
Configuring all its features the 923 system provides many other
facilities such as image capture, editing and transfer facilities,
real time "keyboard chat mode", voice communications and direct file
transfer facilities.

For ease of operation by non-technical staff the Barrett 923
operating system handles all operations involved in routing, linking
and transferring data between HF stations and the Internet or common
email packages. This makes the HF radio system transparent to the
user.

Barrett 923 HF data modems used with the 923 software package are
state of the art, employing the latest Digital Signal Processing
(DSP) techniques, specifically designed for HF operation. 923 systems
will simultaneously support Clover 2000 and Pactor II modems.

Modulation formats vary from simple robust FSK to multi-level
differential phase modulation and two level amplitude modulation
modes, producing actual uncompressed raw data transfer rates of up to
2000 bps. Note:- this raw data rate is actual data throughput with
all modem overheads removed. Sophisticated compression algorithms
within the Barrett 923 operating software produce compressed on-air
data rates of between 4,000 bps and 20,000 bps for text files and up
to 200,000 bps for image files. In real terms this means a typical
fax page can be transmitted, error free, in less than 3 minutes and a
text file, with up to seven pages full of text, in less than a
minute.

Fully integrated with Barrett Communications’ 500 and 900 series of
transceivers and accessories, the Barrett 923 fax and data system is
easy to install and set up however if assistance is required our
international network of sales and service agents are ready to serve.

Email mailbox

A complete email mailbox with automatic routing and forwarding allows
attachment of files, images and faxes to messages. Includes fully
unattended link establishment and forwarding with confirmation of
receipt. Data security is assured via multiple password levels and
on-air encryption.

File transfers

Efficient data compression with adaptive selection of the most
suitable algorithm significantly speeds up file transmission. In
addition, file transfers made as attachments within the email mailbox
system that are interrupted, are restarted automatically at the exact
position within the file that the transfer was stopped, thus
alleviating the need to re-transmit the whole file...another time
saver.

Image Transfer

The 923 system includes a comprehensive image editor that supports
most image file formats. Image compression is built in for high speed
image transfers. The system also includes a Twain interface for use
with most scanners and digitisers. Transferred images can be printed
in full colour, on inkjet, colour laser or video printers.

ALE Automatic Link Evaluation

The 923 software controls the 550 or 950 transceiver via the Barrett
923 modem. ALE channel information is sent to the transceiver on
startup or when a channel is changed. The 923 software also provides
channel scanning and channel change information to the transceiver,
providing fully automated linking between stations on the network
without any user intervention.

Automatic logging

All system activities are stored automatically in log files. These
can be referred to at any time to confirm links or information
transfer.

Voice

The 923 system can automatically set up voice communications between
two stations. Once the voice communications link is established, the
data connection is temporarily suspended, and voice communications
can take place. When completed, the data link is re-established.

Internet, CC mail and MS mail connectivity

Automatic mail forwarding to and from common landline mail systems
such as the Internet, MSmail and CCmail from any station on the
network via the HF hub station computer landline modem or directly
onto a LAN.

Fax-modem interface for fax transmission and reception.

Transmission and reception of faxes from any station via the HF
network to any fax on the international telephone network via the HF
hub station landline fax modem.

Duplex Chat mode

Both sides of a link can type simultaneously whilst file or mailbox
transfers are in progress.

923 Fax and Data System requirements:

HF SSB transceiver Barrett 550 or Barrett 950 with fan and RS-232
control option.

Desktop computer or Laptop computer, PC 586/Pentium or better with a
minimum of 16mB RAM and a mouse. Parallel printer port Serial
interface with 16550 chip Landline FAX/Data modem internal or
external (required only if onward transmission of fax or email
required)

Optional -

Scanner and cable - Twain compliant with parallel or SCSI operation
Printer with parallel interface

Cables

Modem to 550/950 transceiver cable BCA90021