Wireless Network Technologies

802.11 Networks Overview

  • 802.11 networks operate on different frequency ranges:

    • 2.4 GHz Range

    • 5 GHz Range

    • Some standards utilize both ranges for communication.

  • Understanding the frequency and channels in use is crucial for effective networking.

Frequency and Channels

  • Each frequency range has separate channels:

    • Channels are groups of frequencies assigned numbers by the IEEE for easier reference.

    • When utilizing multiple access points in a vicinity, it’s advisable for each point to operate on a different wireless channel to minimize interference.

Regulatory Agencies

  • Regulatory bodies govern the wireless spectrum for 802.11 networks, affecting:

    • Which frequencies can be used.

    • Maximum power limits for transmissions.

    • Interference regulations to ensure network reliability.

Comparison of 2.4 GHz and 5 GHz Networks

2.4 GHz Channels

  • Commonly used channels in the 2.4 GHz band include:

    • Channel 1: 2412 MHz

    • Channel 6: 2437 MHz

    • Channel 11: 2462 MHz

  • Limited to these three separate 20 MHz bandwidths, leading to potential congestion in densely populated areas like apartment complexes.

5 GHz Channels

  • 5 GHz spectrum offers:

    • More channels compared to 2.4 GHz.

    • Greater availability for communication, useful in environments with multiple access points.

    • Bandwidth options:

      • 20 MHz channels

      • 40 MHz bandwidth

      • 80 MHz bandwidth

      • 160 MHz bandwidth (with two separate non-contiguous areas for communication)

Bluetooth and Its Usage

  • Bluetooth networks offer wireless connections for peripherals such as:

    • Headsets

    • External speakers

    • Keyboards

  • Operates within the 2.4 GHz band, utilizing the unlicensed ISM (Industrial, Scientific, and Medical) frequencies.

Personal Area Network (PAN)

  • Bluetooth primarily facilitates connections within a short range:

    • Standard consumer devices cover distances of approximately 10 meters.

    • Industrial Bluetooth can extend beyond 100 meters.

  • Most consumer devices operate within the 10-meter limit due to their intended use and deployment.