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Module 2: Data Link Layer & MAC Sublayer

20267m

Write a short note on Bluetooth.

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Bluetooth

Bluetooth (IEEE 802.15.1) is a short-range wireless technology for connecting devices to form a Personal Area Network (PAN).

Features

  • Operates in the 2.4 GHz ISM band
  • Uses FHSS (frequency hopping, 1600 hops/s) to avoid interference
  • Range about 10 m (Class 2), up to 100 m (Class 1)
  • Low power and low cost

Architecture

  • Piconet: one master and up to 7 active slaves
  • Scatternet: multiple interconnected piconets
  • Uses TDD with time slots of 625 microseconds

Applications

Wireless headsets, keyboards/mice, file transfer between phones, IoT devices and car hands-free systems.

Limitations

Short range, lower data rate than Wi-Fi, security concerns (pairing attacks).

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