The differences appear buried in technical details that have considerable bearing on the systems' long-term prospects (see sidebar “ Tetra and Tetrapol share origin“).Īt the highest level, Tetra and Tetrapol have functionally identical system architectures ( Figure 1). From the user's perspective, both of these all-digital systems offer nearly identical capabilities. While next-generation GSM stalls, professional-mobile-radio users see Tetra and Tetrapol as digital replacement technologies for the widely used MPT-1327 analogue system ( Reference 2). Many of these features appeal to commercial users, too.
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PMR users also expect their systems to connect gracefully with all other network services, including GSM, integrated-services digital networks, LAN/wide-area networks, private circuits, and the public switched telephone network (PSTN). Other features that differentiate PMR from today's GSM include the ability to make pre-emptive priority (emergency) calls and group calls and efficient data-transmission modes-even from a fast-moving vehicle. This method is called “direct mode operation” (DMO). For example, if an officer is out of a base station's range, he must be able to communicate directly with another officer's handset. These users, regardless of their locations, demand unequivocal access to communications, fast call setup, and unquestionable security.
TETRAPOL FDMA TRANSMISSION PLUS
PMR users include members of ambulance, fire, police, and other public-safety organisations, plus military personnel.
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![tetrapol fdma transmission tetrapol fdma transmission](https://i.gr-assets.com/images/S/compressed.photo.goodreads.com/books/1618290194l/13394495.jpg)
Yes, there are some politics here, but if the two systems must differ, users demand that they interoperate seamlessly.Īlthough today's GSM is ideal for personal users and most business users, PMR users demand far more from the system than current GSM networks provide. According to Tetra advocates, MatraCom became Tetrapol to take advantage of Tetra's high profile within the European Telecommunications Standards Institute's (ETSI's) standardisation efforts ( Reference 1). The similar-sounding Tetrapol started life as Matra's proprietary MatraCom MC9600 system. Tetra is an open system from the start the acronym plays on the Greek word for “four” and refers to the fact that there are four transmission channels per carrier. The major competitors for European PMR/PAMR acceptance are terrestrial-trunked radio (Tetra) and Tetrapol, both of which have worldwide ambitions.
TETRAPOL FDMA TRANSMISSION PROFESSIONAL
Now, professional users can enjoy cellularlike telephony and private radio dispatcher services with the same mobile handset.
![tetrapol fdma transmission tetrapol fdma transmission](https://www.bretschneidernet.de/publications/bos-paper/images/TETRAMobil.jpg)
With dedicated professional-mobile-radio backgrounds, alternative systems compete for private-mobile-radio (PMR) and public-access mobile-radio (PAMR) deployments. Consumer models have a lot in common with professional user needs, but there are still compelling reasons why GSM can't deliver in the professional user market. Now, anyone with $100 to spend can roam most of Europe and enjoy direct access to international communications networks. Not long ago, you'd need to be a member of the emergency services or a top executive to make calls from a mobile phone. Global System for Mobile Communications (GSM) phones raise expectations among professional-mobile-radio users to levels that system makers are only now beginning to address.