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racesbul.192
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1994-11-13
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3KB
From : W6HIR @ WA6NWE.#NOCAL.CA.USA
To : RACES @ ALLUS
Msgid : $RACESBUL.192
TO: ALL EMERGENCY MANAGEMENT AGENCIES/OFFICES VIA THE ARS
INFO: ALL RACES OPERATORS IN CA (ALLCA: OFFICIAL)
ALL AMATEURS U.S. (@ USA: INFORMATION)
FROM: CA STATE OFFICE OF EMERGENCY SERVICES (W6HIR @ WA6NWE.CA)
2800 Meadowview Rd., Sacramento, CA 95832 (916)427-4281
RACESBUL.192 DATE: Oct. 21, 1991
SUBJECT: Technical - ALE
The following was submitted by Nathaniel McMillian, NTIA/ITS.
Federal Standard 1045 (FS 1045) defines Automatic Link
Establishment or ALE as the capability of an HF radio to initiate
a circuit between itself and another radio without operator
assistance and usually under processor control. As the Federal
community moves more toward ALE, not only will HF radio operations
become more efficient, but the capability of shared HF radio
resources (or SHARES) will be enhanced. A review of some of the
basic features of ALE will demonstrate its potential.
An ALE radio is designed to continuously monitor an HF network
or networks on up to 100 predesignated channels. Upon detecting
an incoming call, ALE tunes the transmitter, sends a reply to the
caller, and waits for an acknowledgement. Once the
acknowledgement is received, the ALE sounds an alarm
announcing the incoming call, activates the speaker, displays who
is calling, on what frequency, in what mode, and waits for
operator intervention. After the transmission is completed, the
ALE units returns to monitoring the predesignated channels. If
the incoming call is for data traffic, the controller
automatically routes the call to a data terminal without operator
intervention. For outgoing calls, the operator tells the
controller the destination station or stations and the desired
mode of operation. The controller picks the best available
preprogrammed channel, completes all the tuning and handshake
work and, when the link is established, waits for operator
intervention. Besides simple network monitoring and linking, ALE
also provides for linking all stations in a network with a single
call; or automatically responds to a net, or multiple net,
collective call.
With ALE, most of the work is efficiently done by the
processor, leaving the operator free to do other things. As
impressive as ALE is today, additional features are under
development. These features include automatic networking,
automatic message store and forward, anti-interference, privacy,
automatic relaying, and automatic networking with other media.
EOF