3-ma’ruza: Lokal kompyuter tarmog’iga kirish. Lokal tarmoq topologiyasi. Reja



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3-ma’ruza: Lokal kompyuter tarmog’iga kirish.

3-ma’ruza: Lokal kompyuter tarmog’iga kirish.

Lokal tarmoq topologiyasi.

Reja:

1. Lokal kompyuter tarmog’iga kirish.

2. Lokal tarmoq topologiyasi.

Kompyuterlarni bir-biri bilan bog’lash.

Kompyuterlar orasida ma’lumot almashish va umumiy masalalarni birgalikda echish uchun komyuterlarni bir-biri bilan bog’lash ehtiyoji paydo bo’ladi. Kompyuterlarni bir-biri bilan bog’lashda ikki xil usuldan foydalaniladi:

1. Kabel yordamida bog’lash. Bunda kompyuterlar bir-biri bilan koaksial, o’ralgan juftlik kabeli (UTP) yoki shisha tolali kabellar orqali maxsus tarmoq plata yordamida bog’lanadi.

Kabel yordamida bog’lash

2. Simsiz bog’lanish. Bunda kompyuterlar bir-biri bilan simsiz aloqa vositalar yordamida, ya’ni radio to’lqinlar, infraqizil nurlar, WiFi va Bluetooth texnologiyalari yordamida bog’lanadi.

What is Bluetooth, WiFi and WiMAX?

  • Bluetooth, WiFi and WiMAX are wireless technologies which allow devices to inter-connect and communicate with each other. Radio waves are electomagnetic waves and have different frequencies. These technologies are radio frequencies. Similar to the analogue radio, or FM radio. Bluetooth works on 2.45GHz frequency. WiFi works in two frequency bands 2.4GHz and 5GHz. WiMAX works in two frequency bands, 2 - 11GHz and 10 - 66GHz. See chart below for a comparison of these technologies.

Bluetooth

Named after the Danish king, Harold Bluetooth,was the first to emerge, several devices like mobile phones, pdas, headsets, keyboards, mice, medical equipment and even cars now come with this feature. Due to its low cost, manufacturers are willing to implement this technology in most devices. It is designed for short range communications with a range of about 10m. As a result, it consumes less power and are suited for very small battery powered devices and portable devices. Problems associated when devices communicate via infrared or cables are removed. Infrared requires a line of sight, bluetooth only needs to be in reasonable vicinity. As cables are not required, it would be less cumbersome carrying a personal bluetooth device and space would be less cluttered. As bluetooth devices automatically communicate with each other, it requires very little from the user. Bluetooth allows for a wireless Personal Area Network (PAN) with it's short range. See chart below for a comparison of these technologies. For more technical resources and information relating to Bluetooth see the official Bluetooth site.


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