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Priority Receiver Operation Disclosure Number: IPCOM000004671D
Original Publication Date: 2001-Mar-29
Included in the Prior Art Database: 2001-Mar-29
Document File: 2 page(s) / 36K

Publishing Venue


Related People

James A. Bellizio: AUTHOR [+1]


Priority Receiver Operation

This text was extracted from a WORD97 document.
This is the abbreviated version, containing approximately 85% of the total text.

Priority Receiver Operation

By James A. Bellizio

and David L. Weiss

Problem To Be Solved

Currently we are unable to provide console priority operation for a Project 25 voting repeater system without a wireline interface. This invention provides a means of console priority via an RF link allowing for Type 1 and Type 3 crypto usage without a console interface. This will allow for many agencies to use the same repeater system without requiring wireline interface and still provide console priority and parallel audio to all agencies when desired and separation of crypto as required by agency mandate. If two different levels of crypto are to be used over the same infrastructure no method exists to provide priority for the higher level crypto.

How To Solve The Problem

Priority Receiver Operation requires modifications to the existing ASTRO TAC 3000 comparator to provide for one of the receiver inputs to be given priority over all other inputs to the comparator. The priority receiver would serve as a way to provide RF console type priority in systems where no wireline interface device is used. With the addition of a two level Priority Receiver Operation different priority levels can be established for different levels of crypto.

Utilizing existing deployable or fixed system equipment a Spectra control station, portable, or Spectra mobile could be used as a priority control point. Consider the following system (diagram 1) using a Spectra control station transmitting on T1 to the designated priority receiver receiving on R1. Upon receipt of activity on R1 the associated receiver assigned to the Priority Receive Operation port of the comparator, the comparator would terminate any existing input on any other input and process the input from the priority receiver port. The comparator would transmit on T3 (as shown in the below configuration) enabling the Spectra control station an RF console priority control over the system. This configuration can be used for both type 3 crypto and type 1 crypto as no DIU is being created for type 1 this would give us console priority mode of operation for type 1 systems.

Another configuration (Diagram 2) would use the same Priority Receiver Operation to allow for several agencies to have independent control points all talking into the system through the priority receiver. If each agency was programmed with both a common agency encryption key and a unique agency encryption key then when joint communications on the common agency key are required Agency A could transmit on T1 on the common key. Agency B-control station would hear the communication on R3. Parallel control points could be established eliminating contention issues by being able to monitor comparator output. Unique agency key operation could be used and each control point would have an indication of receive traffic to eliminate contention issues.

An alternate configuration...