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AUDIO PATCH HANDLING DURING INTERZONE LINK FAILURE AND RECOVERY IN AN OMNILINK SYSTEM

IP.com Disclosure Number: IPCOM000008671D
Original Publication Date: 1998-Jun-01
Included in the Prior Art Database: 2002-Jul-02
Document File: 4 page(s) / 195K

Publishing Venue

Motorola

Related People

John Wolfe: AUTHOR [+2]

Abstract

OmniLink (OL) is a wide-area, two-way trunked communications system that is comprised of multi- ple trunking subsystems (referred to as zones) that are networked together. Dispatch console operator positions (consoles) may reside within any zone in an OL system, and access the system via the Zone Controller (ZC) in the given zone.

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G& MOTOROLA Techrkd Developments

AUDIO PATCH HANDLING DURING INTERZONE LINK FAILURE AND RECOVERY IN AN OMNILINK SYSTEM

by John Wolfe and Lee Kilayko-Domingo

BACKGROUND

  OmniLink (OL) is a wide-area, two-way trunked communications system that is comprised of multi- ple trunking subsystems (referred to as zones) that are networked together. Dispatch console operator positions (consoles) may reside within any zone in an OL system, and access the system via the Zone Controller (ZC) in the given zone.

  Audio Patch is a dispatch console operation which allows communication between different trunking talkgroups. The setup of an audio patch between talkgroups involves a console operator requesting the system for permission to audio patch each talkgroup. Once an audio patch is established between two or more talkgroups, the console is allowed to route audio between the talkgroups. This console is referred to as the controlling console for the given audio patch.

  Each talkgroup in an OL system is assigned a particular ZC that coordinates and controls all OL interzone activity involving the talkgroup. This ZC

is the Controlling Zone Controller (CZC) for the talkgroup, and its zone is referred to as the Controlling Zone (CZ). When a zone has connectivity with the CZC, a console's audio patch request is forwarded to the talkgroup's CZC which acts as the centralized point of arbitration for audio patches to ensure that the talkgroup's interzone audio patch is granted to no more than one console in the system. When an audio patch request is granted, the CZC returns a grant back to the controlling console's ZC and to all other ZCs which may have consoles monitoring the talkgroup. The ZCs then inform all consoles monitoring the talkgroup and these consoles provide a visual indication to the operator that the talkgroups are audio patched together.

  When processing an audio patch request, if the CZC determines that another console operator already has the requested talkgroup audio patched, the CZC will return an audio patch grant with the current controlling console operator information, thereby denying the secondary audio patch request. See Figure 1 for an example of an interzone audio patch setup and conflict~resolution.

'0 Motorola, 1°C. 1998 Jme 1998

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MOTOROLA Technical Developments

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Fig. 1 OmniLink Audio Patch Setup

THE PROBLEM

  An OmniLink system is comprised of distributed trunking subsystems (zones) which are networked together to form a homogenous wide area system. During failure conditions, zones may lose commu- nication with each other. A methodology is needed to properly take care of audio patches that existed prior to the loss of communication. This methodology should preserve the audio patches at all zones where it is still applicable, and should tear down audio patches at zones where audio cannot be patched together, thereby allowing ot...