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==Comparison between P25 and TETRA== P25 and TETRA are used in more than 53 countries worldwide for both public safety and private sector radio networks. There are some differences in features and capacities:<ref>{{Cite web| title=Pros and Cons of TETRA vs. P25 and the Benefits of a Multi-technology Platform for TETRA, P25 Phase I / Phase II, and Mobile WiMax | url=https://www.powertrunk.com/docs/Pros_and_Cons_of_P25_vs_TETRA.pdf | archive-url=https://web.archive.org/web/20120904073108/http://powertrunk.com/docs/Pros_and_Cons_of_P25_vs_TETRA.pdf | archive-date=2012-09-04}}</ref><ref>{{Cite web|url=https://psc.apcointl.org/2012/05/03/p25-and-tetra-technology-roundtable/|title=P25 and TETRA Technology Roundtable|date=May 3, 2012}}</ref><ref>https://tandcca.com/fm_file/dubai06swancomparison-pdf/ {{Dead link|date=February 2022}}</ref> * TETRA is optimized for high population density areas, and has spectral efficiency of 4 time slots in 25 kHz. (Four communications channels per 25 kHz channel, an efficient use of spectrum). It supports full-duplex voice communication, data, and messaging. It does not provide simulcast. * P25 is optimized for wider area coverage with low population density, and also supports simulcast. It is, however, limited with respect to data support. There is a major subdivision within P25 radio systems: Phase I P25 operates analogue, digital, or mixed mode in a single 12.5 kHz channel. Phase II uses a 2-timeslot TDMA structure in each 12.5 kHz channel.
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