P1246990945BYutj - PowerPoint PPT Presentation

Title: P1246990945BYutj


1
FOXCOMM User Technical
Committee Radio Technology Discussion
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Agenda

• Radio Terms/Definitions
• Multicast vs. Simulcast
• Analog vs. Digital
• Conventional vs. Trunking
• Frequency Considerations
• Interop / Mutual Aid / Migration
• Data
• Comments/Questions?

3
Multicast vs. Simulcast
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Multicast
Different frequencies at each site Good fit when
excess channels available Mobile coverage Low
number of talkpaths required at a site
f
f
f
f
f
f
1
2
3
4
5
6
5
Simulcast
Most frequency efficient architecture More
Coverage with overlap Enhanced In-Building
Coverage Site Expansion Without Additional
Frequencies Expansion Without Reprogramming Radios
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Simulcast Configurations Improves Shadowing
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Analog vs. Digital
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Analog vs. Digital Radios
Analog Radio
Conventional and Trunked VHF, UHF, 700 and 800Mhz
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Benefits of Digital Technologies
Improved Signaling Capabilities Excess
bandwidth used for signaling control Enhanced
features such as Unit IDs Identification,
Adaptive Power Control, etc. Forward Error
Correction
10
Benefits of Digital Technologies Improved Audio
Quality
Digital
Good
Audio Quality

Analog
Poor
Signal Strength
Weak
Strong
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Conventional vs. Trunking
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Conventional Radio
Channel 2 Not In Use
Channel 1 In Use
Call Blocked
EMS
Police
Fire
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Trunked System - Talkgrouping
EMS
Fire
Voice Communication
Idle
Idle
Idle
3
2
5
4
1
Police
Controller
Talkgroups rest on the control
channel Talkgroup receives voice channel grant
upon request When conversation complete all units
return to control channel
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Trunking Features

• Talkgrouping
• Push To Talk ID
• Emergency
• Private Call
• Call Alert
• Scan
• Priority
• Busy Queing

Police
15
Frequency Band Considerations
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Frequency Band Considerations Organized vs.
Unorganized
VHF
136MHz
172MHz
700/800 MHz
824MHz
851MHz
869MHz
764MHz
776MHz
794MHz
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Frequency Band Considerations Physical Space
700/800 MHz
VHF
19 RU
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Frequency Band Considerations Site Selection

• VHF
• Restricted
• Water Towers
• are not usable

• 700/800 MHz
• Not as Restricted
• Water Towers
• are usable

20ft (min)
40ft (min)
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Frequency Considerations In Building
Penetration Losses
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Operational Issues
Coverage (Specifically - In Building)
Potential Solutions Simulcast 700/800MHz
Congestion/Capacity Potential Solutions
Trunking 700/800MHz Interference
Potential Solutions 700/800MHz
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Interoperability / Mutual Aid / Migration
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Interoperability/Mutual Aid/Migration
Issue How do users operating on a 700/800MHz
system talk to neighbors who operate on VHF?
Scenario 1 Incident occurs within 700/800MHz
coverage area.
Possible Solution VHF mutual aid channel(s) are
integrated into the 700/800MHz system and patched
to mutual aid talkgroups for VHF mutual
aid/interoperability. The patch can be set up
on the fly or permanently through the console.
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Interop - Scenario 1
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Interop Scenario 1
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Interoperability/Mutual Aid Continued
Scenario 2 Incident occurs outside of the
700/800MHz coverage area.
NOTE Mobile and portable on the street coverage
will extend well beyond county borders

• Possible Solution(s)
• Portable Cross-Band DVRS
• 700/800MHz Mutual Aid Repeater to extend coverage
  into neighboring counties
• Portable Swap
• Carry Two Subscribers (VHF and 700/800MHz)

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Interop - Scenario 2 - Portable DVRS Solution
700MHz RADIO COVERAGE RANGE
VHF RADIO COVERAGE RANGE
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Why use DVRS?
DVRS Extends Portable Radio Communications in RF
Shielded Areas.
PORTABLE RADIO COVERAGE RANGE
DVRS Extends Portable Radio Communications in
Areas where only Mobile Radio Coverage is
available.
MOBILE RADIO COVERAGE RANGE
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Why use DVRS?
DVRS Provides a Migration Path for users
operating with VHF subscribers
MOBILE and Portable On the Street RADIO COVERAGE
RANGE
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How does it work? Outbound Calls
Local Portable
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How does it work?Inbound Calls
XTL Ant
DVR Ant
System Portable
In Car Monitor
Local Portable
Local Portable
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How does it work?Mobile Microphone PTT
XTL Ant
DVR Ant
System Portable
Local Portable
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Data
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Mission Critical Data Solutions
Tier 1 9.6/19.2 kbps
Tier 2 - 100 kbps

• Includes Tier 1
• Fingerprints (Tx)
• Mug Shots (Tx/Rx)
• Reports (Tx)
• Intranet (constrained)
• Internet (constrained)
• AVL

• Messaging
• Dispatch
• Text messaging
• Query Databases
• Drivers License
• License Plates
• Warrants

Text Based
Browser
34
Optimal Performance Enables New Applications
Push Enter to Begin
Loading
DONE..
Tier 2
Tier 1 (19.2kbs)
Tier 3
Tier 1 (9.6kbs)
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Motorolas Mission Critical Data Platform
Primary Voice System ( County, Region, State or
Nationwide)
9.6 kbps
96 kbps
230 kbps
Primary Data System (City Wide)
Hotspots up to 54 Mbps
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Questions? Comments?