Statewide Interoperability Gateways

8.5Statewide Interoperability Gateways

Consider terrain and other agencies affected and potential interference before patching.

Whenever possible, position gateways and mobile command posts on the highest terrain available to achieve maximum antenna height.

Accomplish patching on tactical or command channels. The following Oklahoma common channels — STATE LAW (OKLAW1), STATE FIRE (OKFIRE1), STATE LG MA (OKLGMA1), EMA, and HEARS [EMS] (VMED28) — are heavily used throughout the state and subject to interference. These channels should NOT be patched with the OKWIN system or to any operational repeater for on-scene incident operations under normal circumstances.

Always indicate patched channels on the ICS-205 form.

Because of co-channel and co-band interference, it is recommended that patching from a vehicle be limited to one channel on VHF Low Band, VHF High Band, UHF, and 800 MHz radio systems due to rooftop antenna separation issues.

Generally, patch channels using low RF power to reduce interference.

The person responsible for on-scene communications should continually monitor all patched channels for interference and other technical problems.

Only patch channels as long as necessary.

Always broadcast on the affected channels when the patch is brought up, brought down and when channels are added or removed from the patch.

9OKWIN Regional Interoperability Procedures

The OKWIN 800 MHz radio system has statewide mutual aid talkgroups, designated as SMAs, and regional mutual aid talkgroups, designated as RMAs. There are five regions in the OKWIN system. The Channel IDs for RMA talkgroups have the two letter regional designator as part of the Channel ID. For example, RMA NW is a regional mutual aid talkgroup in the Northwest Region; RMAs in the Central Region have RMA CN as Channel IDs, etc. The first channel in each set of RMAs is the calling channel for that region.
A regional map of Oklahoma is provided on the following page as a reference.

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OKWIN System Regional Mutual Aid Talkgroups

9.1Central Region

The OKWIN Central Region consists of the following counties:

Canadian	Lincoln	McClain	Pottawatomie
Cleveland	Logan	Oklahoma

OKWIN Interoperability Talkgroups
Talkgroup Name	Talkgroup ID
Central Oklahoma Regional Mutual Aid – Calling	RMA CN 2A
Central Oklahoma Regional Mutual Aid	RMA CN 2B
Central Oklahoma Regional Mutual Aid	RMA CN 2C
Central Oklahoma Regional Mutual Aid	RMA CN 2D
Central Oklahoma Regional Mutual Aid	RMA CN 2E
Central Oklahoma Regional Mutual Aid	RMA CN 2F
Central Oklahoma Regional Mutual Aid	RMA CN 2G
Central Oklahoma Regional Mutual Aid	RMA CN 2H
Central Oklahoma Regional Mutual Aid	RMA CN 2i
Central Oklahoma Regional Mutual Aid	RMA CN 2J
Central Oklahoma Regional Mutual Aid	RMA CN 2K
Central Oklahoma Regional Mutual Aid	RMA CN 2L
Central Oklahoma Regional Mutual Aid	RMA CN 2M
Central Oklahoma Regional Mutual Aid	RMA CN 2N
Central Oklahoma Regional Mutual Aid	RMA CN 2o

Five talkgroups on the Oklahoma City EDACS trunked radio system are interconnected to the first five OKWIN Central Region RMAs.

Oklahoma City Mutual Aid Talkgroups (EDACS)
Talkgroup Name	Talkgroup ID
Central Oklahoma Regional Mutual Aid – Calling	RMA CN 2A
Central Oklahoma Regional Mutual Aid	RMA CN 2B
Central Oklahoma Regional Mutual Aid	RMA CN 2C
Central Oklahoma Regional Mutual Aid	RMA CN 2D
Central Oklahoma Regional Mutual Aid	RMA CN 2E
These Oklahoma City radio system talkgroups are mapped to the identically named talkgroups on the OKWIN using an interoperable gateway. Within the coverage area of the Oklahoma City radio system, these channels may be used for interoperable communications with the corresponding OKWIN regional mutual aid channels.

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