Apparently Motorola has digital voice capabilities on their old trunking systems, what kind of digital voice was it since DMR didn't come out until 2005 and these systems have existed since I think the 80s to early 90s? But I just want to know what digital voice was used on those systems.
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What was the digital voice mode on the Motorola Type Trunking Systems?
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MTS2000des
5B2_BEE00 Czar
The first Astro (circa 1991) used VSELP (Vector Sum Excited Linear Prediction) and debuted in late 1991/early 1992. When APCO began the P25 IMBE based codecs in 1996, the first Smartzone systems that used VSELP were phased out in favor of a traditional 3600 baud CC with IMBE capable voice but the system itself was not "P25 compliant". Astro 25 (true P25 compliant trunking) arrived in late 2001/early 2002 IIRC.
Motorola also was the father of iDEN which was used by Nextel, Southern LINC, AirINC and a few other operators worldwide. iDEN also used VSELP when it first hit the streets. The first iDEN systems were circuit switched, with the later versions being IP.
Prior to VSELP, DES and DVP were encrypted digital voice formats, available on both trunking and conventional. Used a 12 bit CVSD modulation. Many Smartnet systems supported Securenet and algorithms included DES and DVP. You can read more about Securenet here:
Motorola also was the father of iDEN which was used by Nextel, Southern LINC, AirINC and a few other operators worldwide. iDEN also used VSELP when it first hit the streets. The first iDEN systems were circuit switched, with the later versions being IP.
Prior to VSELP, DES and DVP were encrypted digital voice formats, available on both trunking and conventional. Used a 12 bit CVSD modulation. Many Smartnet systems supported Securenet and algorithms included DES and DVP. You can read more about Securenet here:
@MTS2000des gave the comprehensive answer, so I'll give the concise answer, which is that the majority of Motorola 3600 systems that are/were capable of digital modulation use the P25 CAI (Common Air Interface), which is the DVSI IMBE codec.
ElroyJetson
Getting tired of all the stupidity.
It'd be interesting if there were a document that describes the step by step progression of the various aspects of Motorola trunking from the very first basic 5 channel versions with only analog voice up to today's full P25 compliant systems. I know that the evolution has involved a fairly large number of steps, many of which could be implemented via upgrades, others requiring upgrade-via-forklift and expenditure of cubic dollars.
I was just telling a coworker about VSELP astro sabers the other day. I used to have two. Fun toys
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