Does anyone know the specific name for the signaling used in MPT-1327 systems? Another thread mentions "MAP27"...
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MPT1327 Signalling Name
- Thread starter Gezelle007
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Comint
Member
Probably depends on what you are referring to, as signalling.
MAP27 is Mobile Access Protocol, and is the interface between a Mobile and a Data Terminal Equipment (DTE).
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Comint
Specifically the signaling used for unit identification. The burst at the end of most mobile and portable transmissions. But in the system I'm currently monitoring - the sound changes from being very short, to a bit longer seemingly depending on each site the voice channel is being transmitted from.
Comint
Member
The unit identification is sent in the normal data stream (using FFSK), and this can be decoded using programs such as TrunkView, or Unitrunker.
As an option, information, such as Maintenance messages, and PTT OFF can be sent at the end of most transmissions, but in seven years of monitoring MPT1327 systems, I don't recall ever hearing a 'burst at the end of most ... transmissions'. Mind you, the American implementation of MPT1327 seems to be different to the rest of the world.
A Clear message is sent over the Voice Channel (using FFSK) at the completion of a Call (after the last transmission), and some Sites seem to send more Clear messages than others.
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Comint
I've heard a lot of different sounds. The Mobiles, Tait TM8000's, or whatever version is UHF- emit either a shriek, or a very snappy blip. The newer portable used, the Tait TP8100 series, emits a shriek sound. The Tait Orca 5000 does not emit any noise other than that of the Otto Type speaker mics de-keying, and the other radios, used by the county agencies- the Kenwood TK-3180 and the Kenwood TK-8180, emit a shriek similar to the TP8100 series. There is one other radio, probably a Kenwood, that emits a very long 3 burst shriek. I think its the radio sending the unit ID at least 3 times over for insurance or something.
Yes, the channels do have the clear message at the end of the 15 second inactivity/hangtime, which is quite loud and annoying. I've managing to get one of my portable radios to mute that out. I haven't found an alternative muting solution for an older scanner. Ive used Trunkview, but I don't have a scanner that has Serial output, and Ive never seen Trunkview decode the unit ids. So maybe it is different from standard protocols.
Comint
Member
The early implementations of MPT1327 in America, used ACSSB (Amplitude Compandered Single-Sideband), but later installations are FM as used in the rest of the world, and your list of radios rules out an ACSSB system.
As for the shrieks, definitely haven't heard anything like that. It is possible that it is something like ANI (Automatic Number Identification).
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Just getting into the 'wild guess' department.
Do any of the radios have a display like the attached image?
Or a label on the case similar to the following lines
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Comint
As for the shrieks, definitely haven't heard anything like that. It is possible that it is something like ANI (Automatic Number Identification).
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Just getting into the 'wild guess' department.
Do any of the radios have a display like the attached image?
Or a label on the case similar to the following lines
Code:
xxxx
260 / 2401 / 266
7600Comint
Attachments
All of the radios they use have displays.
Anyways for example, the display you gave, instead of showing just numbers, it would say "Conference to "whatever channel". And when you open a channel, it would show the channel frequency number and then go away. And it shows the unit alias when an ANI is present.
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