DMR (Digital Mobile Radio) yog tus qauv xov tooj cua digital tsim los ntawm European Telecommunications Standards Institute (ETSI), uas tau pom zoo thawj zaug hauv xyoo 2005.
Lub koom haum DMR yog ib lub koom haum suav nrog cov tuam txhab ua lag luam ntawm DMR khoom; Cov khoom siv tseem ceeb suav nrog Motorola, Hytera, Selex, thiab Tait. Lub koom haum cov tswv cuab tseem ceeb yog CML, Funkwerk Koelleda, Fylde, Hytera, ICOM, KENWOOD, MOTOROLA, Pab Pawg Simoco, SELEX, Tait, thiab Vertex.
Tus qauv DMR tau tsim los hais txog cov kev xav tau ntawm nruab nrab - mus rau -qis - kawg kev lag luam thiab kev lag luam, ua rau nws tsim nyog rau cov haujlwm xws li kev siv hluav taws xob, tsev kawm ntawv, tsev kho mob, tsev so, thiab kev tswj hwm vaj tse.
Tus qauv DMR siv TDMA (ob-lub sijhawm-slot) ntau- cov txheej txheem nkag, uas siv Lub Sijhawm Division Multiplexing (TDM) thev naus laus zis los faib ib qho 12.5 kHz channel rau hauv ob lub sijhawm ywj pheej. Qhov no ua rau lub kaw lus txhawb nqa ob lub suab hu ib txhij - lossis ib lub suab hu thiab ib qho kwj cov ntaub ntawv - ntawm ib zaus. Tus qauv nta 12.5 kHz channel sib nrug, 4FSK kev hloov pauv, thiab cov ntaub ntawv xa tawm ntawm 9.6 kbps. Nws txhais tau peb hom kev ua haujlwm: yam tsis muaj ntawv tso cai ncaj qha (Tier I), hom ntawv tso cai (Tier II), thiab cov ntawv tso cai trunked hom nrog kev txhawb nqa rau kev xa tawm hauv nruab nrab (Tier III).
