Where the Technology is today!
MPT1327 - there are no enhancements planned. The real "strength" in MPT1327 is that it is stable and static standard. Manufacturers and users alike can be assured MPT is stable and will not change thereby protecting investments.

• TWO CHANNEL FDMA SYSTEM - DIAGRAM

 

MPT1327 Analogue Trunking

MPT 1327 is a industry standard for trunked radio communications networks. It was developed in 1988 by the British Department of Trade and Industry (DTI), Although a British standard it is widely used around the world and the most used trunked radio protocol.

• Analogue voice quality
• Fast emergency call set-up
• Comprehensive support to group and individual voice and data communications
• Digital control channnel for fast call setup supports + data services
• Subsriber units support encryption levels (Option Boards)
• Data transmission via MAP27 - AVL, Message Handling Dispatcher and Email gateway.
• Fylde MPT1327 is capabable of 500+ sites over multi-regions and Countries

Data messages between mobiles and the network are exchanged on the control channel at 1200 bits per second. Each subscriber in an MPT-1327 trunked radio network has a unique call number.
For the duration of a call a subscriber is exclusively allocated a traffic channel from the available trunk.

Narrow Band Communications
MPT1327 already fits in to the 12.5 Khz transmission mask so conforms to US narrow banding legislation.

Take a closer look at Fylde's MPT 1327 Solutions>>

Where the Technology is today!
DMR - exists in Tier 1 and Tier 2 today. Tier 3 (trunking) has been published and at least 4 manufacturers are working on equipment. Due to the greater complexity of TDMA solutions, we expect equipment to appear 2011.

There are three tiers in the DMR standard.

DMR Tier III: Trunked

DMR Tier III covers trunking operation in frequency bands 66-960MHz. The Tier III standard specifies two-slot TDMA in 12.5kHz channels. Tier III supports voice and short messaging handling similar to MPT-1327 with built-in 128 character status messaging and short messaging with up to 288 bits of data in a variety of formats. It also supports packet data service in a variety of formats, including support for IPv4 and IPv6.

DMR Tier II: Conventional

DMR Tier II covers licensed conventional radio systems, mobiles and hand portables operating in PMR frequency bands from 66-960MHz. The ETSI DMR Tier II standard is targeted at users who need spectral efficiency, advanced voice features and integrated IP data services in licensed bands for high-power communications. ETSI DMR Tier II specifies two-slot TDMA in 12.5kHz channels.
DMR Tier II products are commercially available today.

DMR Tier I products are for license-free use in the 446MHz band.

Tier I provides for consumer applications and low-power commercial applications, using a maximum of 0.5Watt RF power. With a limited number of channels and no use of repeaters, no use of telephone interconnects, and fixed/integrated antennas, Tier I DMR devices are best suited for personal use, recreation, small retail and other settings that do not require wide area coverage or advanced features.

More About Fylde's DMR Digital Migration >>

Information source - www.dmrassociation.org

Where the Technology is today!
dPMR - exists in Tier 1 today. Tier 2/3 (trunking) has now being published .
Equipment is likely to appear early 2011

dPMR Mode 3

dPMR Mode 3 is the final step where all the possible functionality of the protocol is available. Mode 3 can offer multichannel, multisite radio networks that are fully managed by specific beacon channels at each radio site. This ensures optimum use of spectrum and optimum density of radio traffic.

Management of the radio network starts from the authentication of radios that wish to connect. Calls are set-up by the infrastructure when both parties have responded to the call request ensuring optimum use of the radio resource. Calls may be diverted to other radios, landline numbers or even IP addresses. The infrastructure managing these beacon channels would be capable to placing a call to another radio whether that radio is using the same site or another site within the network.

As the allocation of communication channels is made dynamically, the system can further optimise traffic by dynamically modifying permitted call times. Radios that fail authentication can be blocked, either temporarily or permanently. The system will allow radios with the authority to make priority or emergency calls to pre-empt the use of channels from users making non-priority calls. Where call requests exceed capacity, these calls can be queued by the system until resources become available.

All the services and functions available in Mode 1 and 2 are possible with a few exceptions as well as several extra functions implemented by the beacon channel infrastructure.

dPMR Mode 2

In the dPMR Mode 2 level of functionality, repeaters and infrastructure are added. This brings extra functionality such as network interfaces which can be IP based or simply analogue. Coverage areas are greatly increased, even more so when multiple repeaters are used. Such multiple repeaters can be managed by dynamic channel selection or they can be co-channel wide area using that specific function from the dPMR Mode 2 protocol.

Again, dPMR Mode 2 can offer all the basic functions of the Mode 1 protocol with the extra benefit of being able to interface beyond the wireless part of the network. IP connectivity will permit user groups to include PC based terminals from other offices, areas or even countries. The same interface could provide remote control of a base station or repeater from a fixed connection.

dPMR Mode 1

This is the peer to peer mode of dPMR (without repeaters or infrastructure) but without the limitations of the licence-free counterpart. It can operate all typical licenced PMR frequency bands and without the RF power limits of dPMR446.
As well as offering voice and data, dPMR446 Mode 1 also supports combined voice+data so it is possible to embed data into a voice call or automatically append it at the end of a call.

dPMR Mode 1 can be considered as an advanced version of dPMR446. Certainly by programming a dPMR Mode 1 radio with the same frequencies and colour codes and address mode as a dPMR446 radio it would be possible for the two radios to communicate.

Just as for dPMR446, the dPMR Mode 1 protocol also supports combined voice+data so it is possible to embed data into a voice call or automatically append it at the end of a call. This means that dPMR446 can offer all the usual voice services plus text messaging (SMS), status information texts, embedded data such as GPS position etc.

The removal of licence-free limitations means that dPMR Mode 1 can also offer such functions as priority and emergency calls and break-in.

dPMR446

This is dPMR in its simplest form, a peer to peer only operation without base stations or repeaters. As this equipment operates under licence-free status it has to follow similar limitations as for the analogue equivalent PMR446.
These limitations are that RF power is limited to 0,5 watt and only handheld equipment is permitted. The frequency allocation is just above that used by PMR446 and operates on 446,100 to 446,200 MHz. Naturally, because of the 6,25 kHz channeling, dPMR446 offers double the number or channels as PMR446.

dPMR446 equipment is capable of both voice and data modes of operation using a simplified addressing system that can be considered analogous with CTCSS use in PMR446 or with an extended addressing system as used by the fully functional TS102 658 type dPMR radios.

As well as offering voice and data, dPMR446 protocol also supports combined voice+data so it is possible to embed data into a voice call or automatically append it at the end of a call. This means that dPMR446 can offer all the usual voice services plus text messaging (SMS), status information texts, embedded data such as GPS position etc.

More About Fylde's dPMR Digital Migration >>

Information source - www.dpmr-mou.org

	TS 102 361-1: the DMR air interface protocol
	TS 102 361-2: the DMR voice and generic services and facilities
	TS 102 361-3: the DMR data protocol
	TS 102 361-4: the DMR Trunking protocol

There is also a designer’s guide encompassing elements from all standards parts that is an easier read:

TR 102 398: DMR General System Design