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METHOD OF INTERCONNECTING COMMUNICATIONS RESOURCES

IP.com Disclosure Number: IPCOM000009766D
Original Publication Date: 2000-May-01
Included in the Prior Art Database: 2002-Sep-17
Document File: 2 page(s) / 82K

Publishing Venue

Motorola

Related People

William A. Thompson: AUTHOR

Abstract

The US Coast Guard in Juneau, Alaska, has eleven sites which each have two T12R12 base stations and a monitor receiver. All the base stations are on the same frequency and the monitor receiver is on one of the 12 frequencies. This results in a massive number of RF crossmute pairs, far too many for the built in RF crossmute in CENTRACOM.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 50% of the total text.

MOTOROLA

Technical Developments

METHOD OF INTERCONNECTING COMMUNICATIONS RESOURCES

by William A. Thompson

The US Coast Guard in Juneau, Alaska, has eleven sites which each have two T12R12 base stations and a monitor receiver. All the base stations are on the same frequency and the monitor receiver is on one of the 12 frequencies. This results in a massive number of RF crossmute pairs, far too many for the built in RF crossmute in CENTRACOM.

RF Crossmute Server for US Coast Guard, Juneau

T12R12 Base Station

CEB

Audio to Base Station

High Speed Mute

BIM1

Key Relay

COIM

COIM

Audio to Base Station

BIMn

Key Relay

COIM

PC

CIE

-

.=-..

Ethernet LAN

COM/ADM $er..er

PROBLEM

T12R12 Base Station

Mute

( :;;;:r"a~ \

V

W.

Thompson 5/31/98

Motorola Inc. 2000

26

May 2000

MOTOROLA

Technical Developments

The usual solution for this problem uses tone remote decoders and a large diode/relay matrix to activate the high speed mute inputs on the BIM cards. This results in a large amount of hardware which must be modified manually any time a change occurs in the crossmuting relationships.

SOLUTION

Use a hybrid of an Elite API client program with a software based RF crossmute matrix and the key relay/high speed mute interface of the old hardware solution. The Elite API will supply the information on the frequency settings of the many base stations. The client program will store the frequency information until such time as a BIM is keyed.

Keying the BIM will provide a relay closure to the client program via an input on the I/O card in the PC. The client program will check a matrix using the stored frequency for the keyed BIM...