Washington, DC June 1112, 2002 By Douglas Bigrigg, Marketing Manager Daniels Electronics Ltd.

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Washington, DCJune 11-12, 2002By Douglas
Bigrigg, Marketing ManagerDaniels Electronics
Ltd.
Current and Emerging Solutions to Public Safety
Communications Interoperability
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Daniels Electronics Ltd.

• Manufacture of Modular LMR Communications Systems
• Located in Victoria, B.C., Canada
• Founded in 1938
• Incorporated in 1950
• Synthesized and Crystal Controlled Analog Radio
  Modules
• 30-960 MHz
• P25 Digital Radio Modules
• 132-470 MHz

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Project 25 Digital Technology

• Is an Industry Wide Effort to Set Recommended
  Voluntary Standards for Public Safety
  Communications
• Public Safety Users Evaluate Basic Technologies
  in Advanced LMR and Provide Input to a User Needs
  Committee Within the TIA (Telecommunication
  Industry Association) Standards Setting Process

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Project 25 Digital Technology

• A series of 102 detailed technical specifications
  for digital land mobile radio (LMR)
  communications systems
• Resulting in a suite of ANSI/EIA/TIA Standards

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Project 25 Digital Technology

• Phase I (12.5 kHz Analog / 12.5 kHz Digital
  Compatible)
• Bandwidth 12.5 kHz.
• Modulation C4FM (Non Linear)
• Channel Access FDMA
• Channel Bit Rate 9.6 kbps.
• Vocoder IMBE
• Signaling Format - P25 CAI

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Project 25 Digital Technology

• Phase II (6.25 kHz Digital)
• Bandwidth 6.25 kHz.
• Modulation QPSK-C (Linear)
• Channel Access FDMA
• Channel Bit Rate 9.6 kbps.
• Vocoder IMBE
• Signaling Format - P25 CAI

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P25 Considerations

• System Types
• Unit to Unit Directly
• Basic Station and Field Units
• Multi-Site Simulcast
• Voter Receiver Systems
• Wide and Local Area Trunking
• Multiple Linked Systems - Repeaters
• System Implementations
• VHF, UHF, 700 MHz, 800 MHz (Target Bands)
• Low to Medium Density Economics
• Portable, 8 Hour Battery, Covert Size

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Project 25 Benefits

• Interoperability
• Compatibility with Existing Equipment
• Gradual "Migration-In-Place" Using Existing
  Spectrum
• Range Equal to Current Analog Systems
• Integrated Voice and Data Services

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P25 Major Systems Interfaces

• Common Air Interface
• Radio To Radio Protocol
• Inter-system Interface
• Gateway To All System Interconnections
• Fixed Station Interface
• Base Station To Gateway Definition (Analog And
  Digital)
• Console Interface
• Console To Gateway Definition
• Telephone Interface
• PSTN To Gateway Definition
• Data Interface
• Computer Aided Dispatch To Gateway Definition
• Network Management Interface
• Network To Gateway Definition

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General System Model
INTERFACES
FIELD RADIO
DATA TERMINAL
PSTN
CAI
RF SUB-SYSTEM
FIXED STATION RX / TX
NETWORK
DATA
CONSOLE
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P25 Encryption

• CAI (Common Air Interface) Designed to Support
  the Encryption of User Voice and Data Using
  Symmetric Key Algorithms.
• CAI Designed to Support use of any of the Four
  Types of Algorithms. (DES, Triple DES, AES)
• Type 1 Classified National Government
  Communications
• Type 2 Unclassified National Security-Related
  Communications
• Type 3 Unclassified Sensitive Government
  Communications
• Type 4 For Other Purposes (Exportable)
• CAI Designed to support Over the Air Rekeying
  (OTAR)

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P25 More Information

• http//www.project25.org/
• http//www.apcointl.org/

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Other Interoperable Options

• Cross banding to conventional LMR
• Satellite
• Cellular Phone
• Proprietary LMR Trunked Systems
• Wide band to Narrow band