SmarTrunk Xpress Digital trunking systems are directed to the private carrier/customer licensee who is considering converting conventional VHF/UHF repeaters to trunked operation.  Perhaps you are an operator of shared community repeaters who would like to achieve higher customer loading (and greater profits) from your existing system.  Or perhaps you operate a private on-site system (example: Shop watch Schemes, Community broadcast repeaters) of two or more VHF or UHF conventional channels used for plant security or maintenance.  Either way, converting your conventional channels to trunked operation will significantly increase your system capacity while providing privacy, system security, and advanced features such as selective and emergency calling.

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a single channel SmarTrunk system for Shopwatch schemes

Things you always wanted to know about SmarTrunk

What is SmarTrunk?

The term "trunking" originated decades ago in the telephone industry to describe the process of selecting one clear communications path from many possibilities.  It is based on the premise that if 100 users are sharing a certain communications network, only 10 users will actually use the network at any one time. Therefore, it is not necessary to install 100 trunk lines to serve 100 telephone customers; only 10 lines will be sufficient to provide a high level of service.

The Trunking Advantage

¨ Efficiency
¨ Privacy
¨ Selective Calling

The primary advantages of any trunked radio system can be summarized as follows:

• Automatic selection of a clear channel:
  In a conventional radio system, the user may only have access to a single channel. If the user wishes to make a call, he must first monitor the channel to make sure it's clear. If the channel is busy, the user must continue to monitor the channel until the co-channel user has terminated the conversation. By contrast, in a trunked system the channel selection is automatic. When the user initiates a call, the trunking system electronically "monitors" each channel and selects one clear (unused) channel from many possible channels.

• Channel Privacy:
  In a conventional system, other co-channel users can easily eavesdrop on conversations. In a trunked system, other system users can not listen in on other conversations. A radio can only join a conversation when directed by the trunking controller.

• Channel Exclusivity:
  In a conventional system, discourteous co-channel users can "jump" on a channel in the middle of another conversation, thereby interrupting the call in progress. In a trunked system, once a channel is selected, it becomes exclusive for the duration of the transmission. Other users cannot interrupt or interfere with the call.

• Selective Calling:
  In most conventional radio systems, selective calling is an expensive add-on option or may not be available at all. On the other hand, some trunked radio systems provide extensive selective calling capabilities as a standard feature. This means that users can selectively call different groups or individuals in the system. Each user is typically assigned a unique individual ID code and one or more group ID codes. These codes can be dialed by other users in the system to select only the specific groups or individuals with whom they wish to communicate.
  
  An example, if you operate two community repeaters and each channel is busy 20% of the time, there is a 20% chance that the channel assigned to a given customer will be busy when one of his mobile groups wishes to make a call. But, if the two channels are trunked together, the trunking system will select an open channel when a mobile group wants to make a call.
  
  The odds that both channels are busy at the same time is only 4%. This means that:

  • Your existing customers will receive a much higher level of service; or,

  • You can add 2.5 times as many customers on the system with the same level of service.

Applications

• Small police and fire departments
• Shop watch Schemes
• CBS - Community Broadcast systems
• Government agencies
• Public telephone systems
• Mining operations
• Large industrial manufacturing facilities
• Oil & gas pipeline operations
• Colleges or university campuses
• Petro chemical operations/oil refineries
• Airports
• Forestry and fishing fleets
• Shopping Centres and Hotels

Download information: System Overview, Option 1, Option 2, Option 3, 4 channel example, 8 channel example

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