[Trunkcom] MultiNet

Fri, 04 Jan 2002 17:14:36 -0600

each user is assigned a 5 digit id.  HHUUU  HH is home channel UUU is
user 1 to 250. that means there can be 250 unique user groups with the
same home channel and each hears only his units. Not the others with the
same home channel he has.  For a five channel system (maximum of 20
channels per system) there can be 1250 unique groups of people. With a
full system, theoretically, you could have 5000 unique talk groups per
system. Unlike the motorola and ge systems, no control channel is needed
so if you lose  a channel, the whole system is not in danger. Only that
channel and its users. You can usually busy out a channel from the site,
provided at least the transmitter and controller are working,  and all
users homed on that channel will trunk to another and thus, no one is
out of service.

SJ wrote:
> 
>  Hmm, LTR seems kinda silly the way I understand it, if each agaency is
> assigned a "base" freq. Suppose you have five freqs. assigned to an LTR
> system and more that 5 on the system, wouldn't this cause problems? I
> realize that they don't always stay on the same channel.
>  I may be blind, but I don't see any real advantages of LTR over a standard
> freq. assignment.
> 
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of Brian J Cathcart
> Sent: Friday, January 04, 2002 10:56 AM
> To: [email protected]
> Cc: [email protected]
> Subject: Re: [Trunkcom] MultiNet
> 
> On Fri, 04 Jan 2002 08:39:29 -0500 "Jerry Kacprzycki"
> <[email protected]> writes:
> > So what is the difference between LTR and Multi-Net?
> 
> Multi-Net adds several features designed for Public Safety, such as
> emergency functions, priority access, and wide-area coverage.  Although
> both LTR and Multi-Net use sub-audible data signalling on the voice
> channels, Multi-Net's signalling is different than LTR, and in a sense is
> a different trunking type altogether.  Multi-Net also uses a control
> channel (LTR does not), which is basically one of the voice channels
> continuously transmitting sub-audible data (and unlike other trunking
> formats, the control channel can simultaneously be used as a voice
> channel).  Scanners that track LTR cannot track Multi-Net as it is a
> different format.
> 
> > I thought that they were both made by the same company?
> 
> They are made by the same company, EF Johnson (now owned by Transcrypt).
> But, the LTR format is licensed to several companies who make LTR
> equipment (Motorola, Kenwood, Uniden, etc).  Mutli-Net is only provided
> by EF Johnson.
> 
> --
> 
> The Scanner Dude
> Brian J. Cathcart - KE4PMJ
> South Florida Trunking Guide - 5th Edition (On CD-ROM too!)
> Palm Beach County Frequency Directory - 4th Edition (On CD-ROM too!)
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