Dispatch Operations and Interoperability-Integration

[Gigs]

I have found this system for Nextel Direct Connect. Does anyone have any additional information or experience with hooking this system up and about how much it costs. I do not want to hook it up to a "system". Only to a stand-alone Mobile set up as a base station with power supply. Thanks (CDM1250)

[Tom in D.C.]

You probably won't get much of a response here unless you post more specific information on exactly what it is you're trying to do, which (maybe both) direction(s) you want the signal to go, etc. etc. etc.

[Bill_G]

You didn't provide a link. I think you are talking about this -

http://www.nextel.com/assets/pdfs/en/so ... bility.pdf

It is based on the Raytheon ACU, part of their interoperability solutions.

http://raytheon.com/capabilities/produc ... index.html

I've set up a few of them, but never with a Nextel attached. It was always used to tie multiple conventional and trunking radios together. They work just fine. The biggest problem is the users never remember how to operate the package, and I have to conduct another training class for the ERT's. It is not intuitive.

On the other hand I have used the Telex IP223 and Nexus CSoft to integrate Nextel, trunking, and conventional radios into a unified roip dispatch, and that works pretty good too.

[Jim202]

As Bill has mentioned, there are a number of gateways on the market that can intergrate a number of
different types of radios. Sytech Corp has a circuit card they developed that will take the place of
a Nextel phone and provide both a PTT type operation or a normal cell call with their RIOS gateway.

The RIOS gateway has found a good foothold in the interoperability COMLINK project in Virginia. They
have tied some 37 different 911 dispatch centers together using a simple IP connection between the
different gateway locations. The same gateway has the ability to interconnect the different types
of trunking systems being used in Virginia. These cover the spread from the state police STARS system
to the Motorola and MA-COMM (Harris) trunking systems. Both local radio control and tone remote
control of the radios being used by the different counties are currently interfaced into the system.
Additional locations are in the works of being installed in Virginia.

Jim

You didn't provide a link. I think you are talking about this -

http://www.nextel.com/assets/pdfs/en/so ... bility.pdf

It is based on the Raytheon ACU, part of their interoperability solutions.

http://raytheon.com/capabilities/produc ... index.html

I've set up a few of them, but never with a Nextel attached. It was always used to tie multiple conventional and trunking radios together. They work just fine. The biggest problem is the users never remember how to operate the package, and I have to conduct another training class for the ERT's. It is not intuitive.

On the other hand I have used the Telex IP223 and Nexus CSoft to integrate Nextel, trunking, and conventional radios into a unified roip dispatch, and that works pretty good too.

[Pj]

I only skimmed...but when Motorola had their mega demo trailer floating around, they had a Nextel link intergrated in with a digital smartzone and IIRC P25 Phase 1, AND conventional links.

Somewhere there is a pic on my computer with some of the setup.

Basically you can PTT in on direct connect to a talkgroup on both mobile systems and to a conventional channel. I think this was pre ACU1000 days. All Moto equipment IIRC.

Again...it was their mobile demo trailer for prospective major accounts.

Expect mega $$$, but an ACU or similar device would be more suited if you really needed the intergration.

[Jim202]

One thing that I forgot to mention was the Sytech Corp gateway system also has a card they have developed
that will allow cellular type calls and the direct connect for individual or group calls to be made over the nextel
network. I have seen it in use and on incoming connections it will display the user ID both on cell calls and the
direct connect mode. Their system even has a phone book type recall for numbers already used. This way
you don't have to keep entering in the number you want to connect to.

It has proved to be a very useful tool to extend the normal public safety radio channel into the Nextel / Sprint
network.

Jim

I only skimmed...but when Motorola had their mega demo trailer floating around, they had a Nextel link intergrated in with a digital smartzone and IIRC P25 Phase 1, AND conventional links.

Somewhere there is a pic on my computer with some of the setup.

Basically you can PTT in on direct connect to a talkgroup on both mobile systems and to a conventional channel. I think this was pre ACU1000 days. All Moto equipment IIRC.

Again...it was their mobile demo trailer for prospective major accounts.

Expect mega $$$, but an ACU or similar device would be more suited if you really needed the intergration.

[Gigs]

I am working on this project again and hoping to develop something to use it. I appreciate all of the responses so far; however, these all are "superior" methods and very costly. I'm looking for something "very low key" and minimal expense, like a "home-made" contraption that I made using pieces and parts with a cable that plugs into the nextel phone and somehow connects to the mobile radio. OR as an alternate, I would like to have it connected as a 2nd solution to a scanner at the house for example that anytime the scanner (or mobile as the 1st preferred option) receives a signal, it automatically keys the nextel phone (like an i880 or whatever i could use on my personal account) and activate my remote nextel to hear the message (and if the 1st option above, key up the remote nextel and send transmit audio and keyup to transmit my voice back over the mobile). Thanks

[Bill_G]

You can look at how Telex did it for their NI-223 Nextel to IP-223 interface. It may give you some insight.

http://www.telex.com/UserFiles/Download ... 150000.pdf

[Jim202]

The problem with how your asking for this to be done is not going to fit the context of what
your asking for as being able to interface with a "Nextel" phone and be cheap. What you
don't know is that the phone uses a bunch of AT commands to make it function. You
would have to have some way to control the string of commands it takes to make the
phone do what you want. You would also have to interface the connections.

Cheap and simple won't work here.

The PDF file that Bill-G provided is a level converter and all the work is done by the
IP223. Those run about $1800 per unit plus the software to make it run smoothly.

Jim

I am working on this project again and hoping to develop something to use it. I appreciate all of the responses so far; however, these all are "superior" methods and very costly. I'm looking for something "very low key" and minimal expense, like a "home-made" contraption that I made using pieces and parts with a cable that plugs into the nextel phone and somehow connects to the mobile radio. OR as an alternate, I would like to have it connected as a 2nd solution to a scanner at the house for example that anytime the scanner (or mobile as the 1st preferred option) receives a signal, it automatically keys the nextel phone (like an i880 or whatever i could use on my personal account) and activate my remote nextel to hear the message (and if the 1st option above, key up the remote nextel and send transmit audio and keyup to transmit my voice back over the mobile). Thanks

[Bill_G]

No kidding? AT commands like a modem? I thought it was done with dtmf. Well, that explains the serial interface. I thought that was for exchanging display info. Not easy to McGuiver, but not impossible. Certainly not as simple as the ric Gigs had hoped. Thanks for pointing that out Jim. Probably saved him some time and frustration.

[Bigred]

Maybe one of these could be hacked up to work:

http://www.advancetec.com/producto.php? ... =5&lang=US