Official Motorola Name for P-25 system

[INDY72]

OK the Official name Motorola is giving thier "true P-25" trunking systems is ASTRO 25 Digital Trunking,.. so it is included in the ASTRO family.

Here is the ASTRO Lineup-

ASTRO-VSELP which is a dedicated digital format, and is the antique if you will, and is being slowly phased out.

ASTRO-IMBE (3600 kbps) Which can be iether dedicated digital or mixed mode (Analog and Digital voice)- this is the most popular flavor.

ASTRO 25 (9600 kbps) This is a pure digital voice format, and is the newest in the line, also is still in the minority as far as nationwide implementation.

 

[N_Jay]

OK the Official name Motorola is giving thier "true P-25" trunking systems is ASTRO 25 Digital Trunking,.. so it is included in the ASTRO family.

Here is the ASTRO Lineup-

ASTRO-VSELP which is a dedicated digital format, and is the antique if you will, and is being slowly phased out.

ASTRO-IMBE (3600 kbps) Which can be iether dedicated digital or mixed mode (Analog and Digital voice)- this is the most popular flavor.

ASTRO 25 (9600 kbps) This is a pure digital voice format, and is the newest in the line, also is still in the minority as far as nationwide implementation.

Very Good,

Just to keep it clear, the first two are not "official names".

And Astro-25 also includes conventional systems.

And Astro-25 equipment is used on P25 systems with old 3600 (Smartnet) type control channels.

 

[srm9030]

VSELP is pretty much already gone. There is only one VSELP system left.

IMBE is a just a codec, developed by a company called Digital Voice Systems Inc. IMBE itself has nothing to do with trunking systems. Both 9600 and 3600 baud Motorola trunking systems use IMBE for digital voice, as do P25 compliant conventional systems.

 

[N_Jay]

VSELP is pretty much already gone. There is only one VSELP system left.

IMBE is a just a codec, developed by a company called Digital Voice Systems Inc. IMBE itself has nothing to do with trunking systems. Both 9600 and 3600 baud Motorola trunking systems use IMBE for digital voice, as do P25 compliant conventional systems.

Maybe if three or four more people bring up this FACT, then it will stop being used as shorthand for P25 CAI on this site.

 

[INDY72]

Ummm one left huh? Warren County, MS- ASTRO VSELP,... Memphis, TN-m ASTRO VSELP, sooo which of these is the ONE left?? :roll:

 

[suttles1972]

Ummm one left huh? Warren County, MS- ASTRO VSELP,... Memphis, TN-m ASTRO VSELP, sooo which of these is the ONE left?? :roll:

And don't forget Cleveland, Ohio, to add to the list.

 

[FPO703]

Cleveland is supposedly going to be upgrading (via Homeland Security grant $$$) to APCO-25 9600 baud within the next 2 years. They will become a sub-system of the Ohio MARCS project.

 

[bigreddawg76]

Trenton NJ PD is ASTRO VSELP too....maybe 1 in each state?

 

[N_Jay]

Trenton NJ PD is ASTRO VSELP too....maybe 1 in each state?

It's simply a matter of when the system went in and when it will be upgraded.

No magic, No conspiracy!

Remember upgrades;
1) Cost money
2) Can require subscriber upgrades (cost even more money)
3) Can take a long time

 

[srm9030]

I was under the impression that the only remaining VSELP system anywhere was Cleveland. My bad.

 

[SteveS]

From what I understand if a system only has a 3600 baud control channel than it is not really P25. A true P25 control channel only has the 9600 baud control channel.

Please correct me if that is wrong.

 

[N_Jay]

From what I understand if a system only has a 3600 baud control channel than it is not really P25. A true P25 control channel only has the 9600 baud control channel.

Please correct me if that is wrong.

This has been discussed a few times.

The issue is people oversimplify then try to draw conclusive answers.

P-25 is a suit of standards, not a single unified system design standard.

The three biggest parts (to risk oversimplifying) are;
1 the CAI (Common Air Interface) standard
2 the trunking control standard
3 the encryption standard

A trunking system which uses the P-25 CAI on voice channels and a non P-25 trunking control channel is certainly not as compliant as it could be, but saying it is "Not P25" is like saying because you use slang, you are not speaking "English"! :wink:

 

[mikewazowski]

You are simplifying things too much as well. You need to specify what type of trunking is used as well as the voice format.

A 3600baud control channel is not a P25 trunking system. It's a proprietary Motorola format.

The system may use P25 standard modulation though as well as analog voice.

It's best to leave them in the database as whatever Motorola flavor they are and indicate that the modulation used is a mix of analog and P25 CAI.

If the system is truely 100% P25 format, then show the trunking format as P25 and the modulation as P25 CAI.

Add Peel Region to the list of vselp systems still on the air. Whoever said there was only one system left was jumping to a big conclusion that he/she obviously had no solid information.

 

[wa8pyr]

Cleveland is supposedly going to be upgrading (via Homeland Security grant $$$) to APCO-25 9600 baud within the next 2 years. They will become a sub-system of the Ohio MARCS project.

Correction: there are no local systems being added to MARCS as "subsystems".

Local systems are, however, being added to MARCS radios for interoperability, so perhaps that's what you mean.