[FedCom] OTAR in NYC

[Jeff Kenyon]

This sounds logical.  If we are talking about a trunked system there is a
data exchange when you first turn on your radios and when you transmit if
you listen to the input to whatever freq is the control channel you'll
hear a little blip as well.  How often is it that they are using OTAR to
 rekey units?





On Fri, 19 May 2006 MSDBM at aol.com wrote:

> In NYC, DEA, Customs (CBP), and ICE use OTAR.
>
> All of the OTAR is done over repeater frequencies. What you hear on  simplex
> is apparently the mobile radios being turned on. It seems to  me, that when a
> vehicle is started and the radio powers up, it  transmits a burst of data that
> ids the unit and apparently it's  encryption status. If the computer sees
> that the radio encryption needs to  be updated, the OTAR exchange takes place,
> usually in three or four  transmissions of data. When completed, you hear the
> mobile radio respond  with a data burst that apparently confirms the successful
> download. Can  anyone confirm if this is correct?
>
> Also, all of the OTAR occurs in ANALOG mode, although the radios may be
> utilized solely in P25 Digital. DEA does OTAR on an analog repeater with PL
> 156.7, Customs on an analog repeater with PL 100.0, and ICE on an analog  repeater
> with no PL.
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