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					                          F Y L D E
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    RADIO NETWORK TRUNKING
           Introduction




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              MPT 1327 - What is it?
    • MPT 1327 is one of many
      specifications relating to
      radio equipment for use in
      the United Kingdom. (MPT
      stands for Ministry of Post
      and Telecommunications)
    • The standard details the
      operation of an automatic
      trunked radio network using
      conventional narrow band
      FM radio channels.
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                    Radio Trunking
    • What is meant by trunking?

         • Trunking is the sharing of resources
         • All available channels are utilised to the best advantage.
         • Applied to radio systems, this means the sharing of available
           radio channels.




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    Conventional Radio System

                   Repeater Tf1 Rf2

                   Repeater Tf3 Rf4

                   Repeater Tf5 Rf6




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    Trunked Radio System

                             Repeater Tf1 Rf2
                Fylde TSC
                 FYLDE TSC


                             Repeater Tf3 Rf4
      SIO BUS
                Fylde TSC

                             Repeater Tf5 Rf6

                Fylde TSC




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              Conventional Vs
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            MPT Trunked Systems
    • Efficient utilisation of frequencies.
    • Automatic supervision of all calls
    • Greater immunity to system failures
    • Increased facilities
    • Larger range of compatible radio equipment
      (compared to selective calling systems)
    • Simplicity of Operation

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                   System Access
    – Conventional Radio
      • Channel must be monitored for activity. Co-Channel
        users must clear before the next call is made.
    – Trunked Radio
      • In the Fylde MPT trunked radio systems the required
        party identity is selected by the calling party and the call
        is initiated, with the system then taking control and
        connecting the call onto a free talk channel.



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                          Privacy
    – Conventional Radio
      • Privacy is not fully possible as all users can share the
        same RF channel. Privacy is not practical as the channel
        is monitored for access when free. Coded squelch can be
        used to reduce over talking.
    – Trunked Radio
      • Users in a call have exclusive use of the talk channel for
        the duration of the call. Only the call parties are tuned to
        the RF talk channel. It is also possible to provide speech
        encryption on the radio network.

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         Trunked Radio System Benefits
    •   Efficient use of the RF spectrum
    •   Privacy
    •   Advisory system status messages
    •   Automatic call connections
    •   Subscriber call authorisation
    •   Call limit timing and management
    •   Automatic system fail soft and standby
        mechanisms
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          Fylde MPT System Facilities
     • Local and Intersite speech and status calls.
     • Local and optionally Inter-site group speech
       and short data calls.
     • Inter-fleet and Inter-prefix calls.
     • Radio to PABX/PSTN and PABX/PSTN to
       radio unit speech calls.
     • Call diversion.
     • Non Prescribed Data messages.
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           Fylde System Management
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                   Facilities
     • Variable individual and user group facilities,
       coverage areas and priorities.
     • Dynamic call timers on a time and day of week
       programmable basis.
     • Call billing and traffic statistics.
     • Remote alarm and maintenance facilities.
     (all above facilities require SCI and SYSCON)

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               Supported Call Types
     • Speech Calls
       – Mobile to mobile
       – Mobile to PABX
       – Mobile to PSTN
     • Status calls (pre-defined status codes)
     • Short Data
       – Messages up to 23 chars (GPS Systems)
     • Long Data
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                         Plus....
     •   AVLS
     •   Call Diversion
     •   Group Calls
     •   Called in absence
     •   Pre-emptive Emergency Calls
     •   Priority Calls


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posted:8/1/2011
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