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- 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
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