Using WAVE PTX and DMR.

Q. I've just read your blog on WAVE PTX and DMR interop (https://cwh050.blogspot.com/2021/06/but-what-if-i-need-both.html). With regards to the talkpath licenses - if the gateway runs out of available talkpaths, would it stop a call from working on the DMR network? So, say we have a WRG with 10 talkpaths, and an 11th call is initiated - would this call still work on DMR, but not pass to WAVE, or would the call setup fail on DMR as well?

A. If the Capacity Max network has been configured to use fast start for talkgroups then yes, the call will go ahead on the radio system when there are no free talkpaths at that time. As soon as a talkpath becomes free, the WAVE users would join the call. This would only be true for talkgroups that are configured as . All other talkgroups, not routed through to WAVE would not be affected.

If the radio network uses all start, the calling radio will get a busy indication if all talkpaths are being used. Again, this would only be true for talkgroups that are configured as . All other talkgroups, not routed through to the WAVE cloud would not be affected.

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Q. Additionally, with the 50 talkpath multi-tenant gateway - my intention would be to ask MSI to configure all 300 groups on our Cap Max system in the gateway, and then in the WAVE portal only configure the groups I actually need at that time. Would this arrangement work?

A. Yes, that's the way I would do it.

The WAVE PTX Multitenant Gateway requires some upfront provisioning from Motorola Solutions' side. While this might be okay for most applications, it does become a worry if the fleetmap changes regularly.

The portal is a lot easier to use and allows you to select which radio talkgroups are routed onto WAVE.

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Q. How many talkpaths do I need for a Capacity Max system?

A. You would need to work this out. The number of talkpaths needed on the WAVE gateway depends on the maximum number of concurrent voice calls that include both WAVE and LMR users; the probability of this occuring and how the system should behave in this situation.

If the majority of talkgroup calls do not include WAVE users, then the number of talkpaths you need will be less.

If the users do not use prive calls that much then the number of talkpaths you need can be reduced further. In my experience, more than 95% of voice traffic on large systems is group based.

I would need more details to do the calculations.

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Q. I have a <<not-MOTOTRBO>> DMR system, can I use WAVE PTX?

A. Yes but it depends on what topology is being used. 

For example, on a DMR Tier 2 network, you can use a DM1400 with a Cubic Vocality to provide basic voice capabilities. The same is true for DMR Tier 3 networks but I'd need more details to provide a better answer - in this case you'd need to replace the DM1400 for a DM4600e.

WAVE also supports Dimetra (TETRA) but that's not my area of interest.

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Q. What is a Cubic Vocality?

A. Motorola Solutions has partnered with Cubic Corportation to provide a RoIP solution for WAVE. This device allows you to connect WAVE into any radio system not supported by their WAVE Gateway. 

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If there is anything else, please check the comments.