Real-time system

What Is a Real-Time System? The term “real-time system” refers to any information processing system with hardware and software components that perform real-time application functions and can respond to events within predictable and specific time constraints. What Is a Real-Time System? The term “real-time system” refers to any information processing system with hardware and software components that perform real-time application functions and can respond to events within predictable and specific time constraints.BirWhat Is a Real-Time System? The term “real-time system” refers to any information processing system with hardware and software components that perform real-time application functions and can respond to events within predictable and specific time constraints. What Is a Real-Time System? The term “real-time system” refers to any information processing system with hardware and software components that perform real-time application functions and can respond to events within predictable and specific time constraints. What Is a Real-Time System? The term “real-time system” refers to any information processing system with hardware and software components that perform real-time application functions and can respond to events within predictable and specific time constraints. What Is a Real-Time System? The term “real-time system” refers to any information processing system with hardware and software components that perform real-time application functions and can respond to events within predictable and specific time constraints. What Is a Real-Time System? The term “real-time system” refers to any information processing system with hardware and software components that perform real-time application functions and can respond to events within predictable and specific time constraints. necha yil avval mobil telefon funksiyalari cheklangan edi. Qo‘ng‘iroqlar, SMS-xabarlar, budilnik va “Ilon” («Змейка») o‘yini. 8 megapikselli kamerada suratga olish, ularni Instagramga joylashtirish, o‘z telefoningizdan mikroblog yuritish va ijtimoiy tarmoqlardagi sahifalarni “like” qilish imkoniyati yo‘q edi.

U zamonlar ortda qoldi, dunyoda esa simsiz va yuqori tezlikda axborot uzatish tarmog‘ining yangi avlodlari paydo bo‘lmoqda. Bizga reklama va xabarlar ko‘rinishida yog‘ilib turgan terminlar ichida adashib qolish hech gapmas. Keling, 2G va 3G ning nima ekanligi, GPRS’ning EDGE’dan qanday farqlanishi va LTE’dan nima kutish kerakligini aniqlashtirib olamiz.

“G” – avlod demakdir (inglizcha “generation”). Men barcha “G” lar haqida tartib bilan aytib berishga, ularning farqlarini ajratib ko‘rsatishga harakat qilaman.
1G
1980-yillarda tarmoq texnologiyalari paydo bo‘lib, uyali aloqa taraqqiyotiga turtki berdi – AQShda AMPS, Yevropada NMT va TACS.
U vaqtda modemlar bo‘lsa-da, mobil aloqani axborot uzatish uchun qo‘llash haqida gap bo‘lmagan. Mobil aloqa qo‘ng‘iroqlarni amalga oshirish va ba’zi kamtarona funksiyalar uchun ishlatilgan. Dunyodagi sotuv uchun chiqarilgan ilk uyali telefon – DynaTAC 8000X mana bunday ko‘rinishda bo‘lgan. U 1 kilogrammdan sal og‘irroq bo‘lgan.

Motorola DynaTAC 8000X telefoni. Foto: wikipedia.org

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  Axborot uzatish tezligi – 1,9 kbit/sek
  
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  Bitta qo‘shiqni yuklab olish uchun ketadigan vaqt (4 MB) – deyarli 5 soat
  

2G
1990-yillar boshida D-AMPS va CDMA raqamli uyali tarmoqlar jadal rivojlandi. SMS-xabar jo‘natish, shuningdek, CSD – axborotni 1 soniyada 14,4 kbit tezlikda uzatish imkonini beruvchi texnologiyalar paydo bo‘ldi. Axborotni uzatish uchun maxsus qo‘ng‘iroqni amalga oshirish talab qilingan. Telefon suhbati kabi daqiqasiga pul olinib, bu qimmatga tushar edi.

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  Axborot uzatish tezligi – 14,4 kbit/sek
  
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  Bitta qo‘shiqni yuklab olish uchun ketadigan vaqt (4 MB) – 37 daqiqa