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This book covers the basics of private land mobile radio systems including traditional dispatch, analog trunked radio, logic trunked radio (LTR), and advanced digital land mobile radio systems.
Covered are the basics of LMR including simplex, half-duplex, and full duplex operation. The different types of squelch systems are covered including carrier controlled squelch, tone controlled squelch, and more.....
Sample Diagrams
There are 16 explanatory diagrams in this book
Trunked Radio
This figure shows a typical trunked SMR system. In this example, there are several available radio channels. Mobile radios that operate in this system that wish to communicate may search for an available radio channel by looking for identification tones. Optionally, some trunked radio systems use dedicated radio channels to coordinate access to radio channels.
Tone Controlled Squelch
This figure shows a tone controlled squelch system. In this diagram, the radio receiver only un-mutes (connects) the audio signal when an incoming RF signal level contains a particular squelch tone. This permits to receiver to block out conversations from other nearby users that do not have the same squelch tone.
Integrated Dispatch Enhanced Network
The figure shows a typical integrated dispatch enhanced network (iDEN) system. This diagram shows that the iDEN system communicates with mobile stations in two modes: dispatch and cellular-like. The repeater transmitters are called enhanced base transceiver system (EBTS). The EBTS contains the radio transceivers that link the radio channel to the network communication lines. The control of the EBTS is provided by base station controllers (BSCs). BSCs can control one or more EBTS units. The BSC connects communication paths to either a mobile switching center (MSC) or to a metro packet switch (MPS). The MSC can connect (switch) voice calls to the public telephone network. The MPS routes dispatch calls (called direct connect) to a dispatch applications processor.
Table of Contents
Land Mobile Radio (LMR)
Specialized Mobile Radio (SMR)
Enhanced Specialized Mobile Radio (ESMR)
Market Growth
Technologies
- Two-way Radio
- Squelch Systems
- Trunked Radio
- Digital Radio
Commercial Systems and Standards
- General Mobile Radio Service (GMRS)
- Logic Trunked Radio (LTR)
- LTR-Net™
- Ministry of Posts and Telegraph 1327 (MPT 1327)
- APCO Project 16 (APCO 16)
- ESAS
- SmartNet™
- SmartTrunk™
- SmartZone™
- Integrated Digital Enhanced Network (iDEN)®
- Enhanced Digital Access Communication System (EDACS)
- Passport
- APCO Project 25
- Terrestrial Trunked Mobile Radio (TETRA)
Services
- Voice
- Dispatch
- Paging and Messaging
- Data
Future Enhancements
- Packet Radio
- Dual Mode Radios
Index
About the Author
Mr. Lawrence Harte has over 29 years of experience in the electronics industry including company leadership, product management, development, marketing, design, and testing of telecommunications (cellular), radar, and microwave systems. He has been issued patents relating to cellular technology. He has authored over 75 articles on related subjects and has been a speaker and panel moderator at industry trade events. Mr. Harte earned executive MBA at Wake Forest University and received his Bachelors degree from University of the State of New York. During the TDMA digital cellular standard development process, Mr. Harte served as an editor and voting company representative for the Telecommunications Industries Association (TIA) TR45.3, digital cellular standards committee. As of 2003, Mr. Harte had authored and co-authored over 20 books relating to telecommunications technology. He has served as a consultant and expert witness for leading companies including Ericsson, Siemens, VLSI, AMD, Casio, Samsung, Sony, ATT, Nokia, Hughes and many others.
Description
This book covers the basics of private land mobile radio systems including traditional dispatch, analog trunked radio, logic trunked radio (LTR), and advanced digital land mobile radio systems.
Covered are the basics of LMR including simplex, half-duplex, and full duplex operation. The different types of squelch systems are covered including carrier controlled squelch, tone controlled squelch, and digital squelch. The basics of analog and digital trunked radio systems is provided along with how and why analog trunked radio systems are converting to digital trunked radio systems.
The leading LMR industry standards including APCO, EDACS, MPT1327, iDEN, and Tetra are described along with simple diagrams to explain their operation. You will learn the key types of services that LMR systems can offer and the key applications that are driving the growth of the LMR industry. Included is a how LMR systems are still changing to offer new services.
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