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Transmit inhibit on XTS 1500/XTS2500

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zsauve

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Where I work we have a huge issue with radio users walking all over each other interrupting communications. Is there a feature you can select in the CPS that allows you to inhibit transmit while someone is talking on the radio. My agency uses the Milwaukee county trunked system so it would need to apply to trunking talkgroups
 

ecps92

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Generally trunked systems (Motorola) already have that enabled

Best to talk to the Dept Radio shop, as they will know what features are already
enabled at the Controller

Where I work we have a huge issue with radio users walking all over each other interrupting communications. Is there a feature you can select in the CPS that allows you to inhibit transmit while someone is talking on the radio. My agency uses the Milwaukee county trunked system so it would need to apply to trunking talkgroups
 

RKG

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Generally trunked systems (Motorola) already have that enabled

Best to talk to the Dept Radio shop, as they will know what features are already
enabled at the Controller
Bill has given you sound advice.

To simplify matters a bit, Motorola offers the system operator options for what happens if a non-initiating user keys while his radio is landed on a voice channel in response to a prior (and still pending) channel grant OSW, a situation that is known as a "barge in." One option would cause the barger's radio to send its own ISW over the inbound side of the control channel, which would then be rejected if a prior channel grant were still in effect. This option is often elected by non-public safety system operators. Another option enables the barger's radio to transmit audio over the assigned voice channel--that is to say, intentionally permitting the barge in. This option is usually elected by public safety system operators precisely to enable an officer or firefighter who may be in trouble to preempt the conversation.

If one user group is having a discipline problem with its members' use of the radio, this problem should be addressed by those in command of this user group.
 

hitechRadio

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Sounds Like they have you setup as Message Trunked. I am assuming this is a 3600 analog system.

You need PTT-ID Trunking.

It is never a good idea to barge in over someone, in some circumstances can cause the audio to be completly distorted. Both Analog and P25 will be effected by this. Such as in your case.

Most Public saftey systems should be set, to not allow simultaneous transmissions on the voice channel. All PTT's of subscribers will have to go through the Control Channel first.

These setting's would need to be set in the system as well as the subscribers radio's.
 

RKG

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There are three flavors of trunking protocol: Message, Transmission and PTT-ID.

In Message Trunking, the assigned voice channel remains up for the hang time once the initiator unkeys, and any unit sending valid freq and connect tone on the voice channel input can transmit over the voice channel, either during the initiator's (or anyone else's) transmission (a barge in) or during the hang time. Pressing the key on a subscriber that has made the initial switch to the voice channel will transmit on the voice channel input until expiration of the hang time.

In Transmission Trunking, the voice channel is disestablished as soon as the initiator's radio sends the disconnect signal. Any replies require a new channel grant. Pressing the key on a subscriber that has made the switch will not transmit on the voice channel input, but will send a fresh channel grant request ISW on the control channel input.

When these were the only two options, public safety almost universally opted for message trunking, since the capacity to barge in is considered potentially a life safety issue for police and fire use. However, message trunking does not allow the system controller to see the IDs of any units other than the initiating subscriber.

As a result, Motorola came up with a third flavor, PTT-ID trunking. This functions the same as Message Trunking, except that the non-initiating subscriber keyed after initial switching to the voice channel first sends its ID on the input side of the control channel, and then it switches back to the voice channel and accesses the voice channel via valid freq and connect tone. Barge in is permitted. Today, PTT-ID is universally employed in public safety applications.

For any given talkgroup, the conversation type set in subscribers' radios in the "personality" attached to that talkgroup must match the conversation type assigned to that talkgroup by the system controller.

The Motorola description of the foregoing is thus:

Message: The system assigns a traffic channel for the duration of a single transmission by one subscriber. When the subscriber dekeys, all subscribers remain on the traffic channel until the traffic channel hang time expires. Once the hang time expires the subscriber radios return to the control channel. Any radio involved in the call may PTT while it is on the traffic channel without returning to the control channel. Message trunking is available on 3600 baud control channel systems. It is not compatible with Motorola Astro 25 Systems

Transmission: The system assigns a traffic channel for the duration of a single transmission by one subscriber. When the subscriber dekeys, the traffic channel is deallocated and all subscribers involved in the call return to the control channel. Any subsequent traffic channel requests will be sent in on the control channel by the requesting radio.

PTT ID: Indicates the system assigns a traffic channel for the duration of the entire conversation as follows. After a subscriber dekeys, the voice channel stays active (hang time) during which time the subscribers stay idle on the voice channel. Any subscriber responding during this hang time will first key up on the control channel to send a message with its PTT-ID indicating it wants to send audio now for this call: the system then sends a grant message directing the subscriber back to the same voice channel acting as the new source.
 

slicerwizard

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Is there a feature you can select in the CPS that allows you to inhibit transmit while someone is talking on the radio.
Sounds like the radios are programmed for message trunking; this lets them walk over other users at will.

If the radios are reprogrammed with PTT-ID selected, they will always request channel access when the PTT button is depressed; that lets the site controller arbitrate channel access. Controllers can be programmed to allow or disallow "talk over".

If the radio programming is changed to transmission trunking, the radios will not attempt to transmit while the voice channel is in use. This will guarantee that, barring a controller firmware bug (they do exist), users will not walk over each other.


Pretty sure I've remembered those options correctly. Choose wisely.
 
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