802.11g Channels ====================== .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What are channels in 802.11g?** Channels in 802.11g refer to specific frequency ranges in the 2.4 GHz band on which wireless devices communicate. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How many channels are available in 802.11g?** 802.11g supports up to 14 channels globally, though availability depends on regional regulations. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What is a frequency band in wireless communication?** A frequency band is a specific range of frequencies within the radio spectrum used for communication. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Which frequency band does 802.11g operate in?** 802.11g operates in the 2.4 GHz frequency band, specifically between 2.4 GHz and 2.4835 GHz. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What are ISM bands in 802.11g?** ISM (Industrial, Scientific, Medical) bands are unlicensed frequency ranges, including the 2.4 GHz band used by 802.11g. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What is channel width in 802.11g?** Channel width refers to the size of the frequency band used to transmit data. In 802.11g, it is 20 MHz. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Why does 802.11g use 20 MHz channels?** 20 MHz channels balance throughput and interference, standardizing device operation in the crowded 2.4 GHz band. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Are 802.11g channels overlapping?** Yes, adjacent 20 MHz channels in 2.4 GHz overlap, causing interference if not carefully planned. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What determines the number of usable channels?** Regional regulations and interference considerations limit usable channels, commonly to 3 non-overlapping channels (1, 6, 11). .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What is Dynamic Frequency Selection (DFS)?** DFS is generally not required in 2.4 GHz for 802.11g due to the band’s regulatory status. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What is Transmit Power Control (TPC)?** TPC adjusts transmit power to optimize link quality and minimize interference in 802.11g networks. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Can 802.11g use 40 MHz or 80 MHz channels?** No, 802.11g only supports 20 MHz channels; wider channels were introduced in 802.11n and later. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Why is channel planning important in 802.11g?** It reduces interference from overlapping channels and other 2.4 GHz devices, improving network reliability. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Are all 2.4 GHz channels available globally?** No, channel availability varies slightly by country due to different regulations. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Can devices auto-select 802.11g channels?** Yes, many devices scan and choose the least congested channel automatically. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How do clients know which channel to use?** Clients scan for access points broadcasting beacons and connect on their advertised channels. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What is the channel center frequency?** The midpoint frequency of a channel. For example, Channel 1 centers at 2.412 GHz. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How are 802.11g channels numbered?** Channels are numbered 1 through 14 depending on regional allowance, spaced by 5 MHz increments. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What are the typical channel numbers for 802.11g?** Commonly used channels are 1, 6, and 11 to avoid overlap. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How far apart are 802.11g channels spaced?** Channels are spaced 5 MHz apart but use 20 MHz width causing overlap. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What is co-channel interference?** When multiple APs use the same channel, causing contention and degraded throughput. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **How can co-channel interference be avoided in 802.11g?** By carefully selecting channels 1, 6, and 11 and spacing access points appropriately. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Does weather affect 2.4 GHz channel performance?** Generally minimal indoors; 2.4 GHz penetrates walls better than 5 GHz. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Why is 2.4 GHz considered more congested than 5 GHz?** Many devices (Bluetooth, microwaves, cordless phones) use 2.4 GHz, causing interference. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What is the typical range of 802.11g channels?** 2.4 GHz offers longer range than 5 GHz, typically up to 70 meters indoors. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **Can 802.11g channels be used outdoors?** Yes, subject to local regulations and power limits. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What happens if two APs use the same channel?** They share the medium and compete, which can lower throughput. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow **What tools help with 802.11g channel planning?** Wi-Fi analyzers, spectrum scanners, and site survey tools assist planning. .. panels:: :container: container pb-4 :column: col-lg-12 p-2 :card: shadow Topics in this section, * :ref:`List of channels ` * :ref:`List of channel widths ` * :ref:`List of Bands ` * :ref:`Reference links ` .. _channels_g_step4: .. tab-set:: .. tab-item:: List of channels (802.11g) ===================== ======================= ========================= Channel Number (MHz) Center Frequency (MHz) Frequency Range (MHz) ===================== ======================= ========================= 1 2412 2401 – 2423 2 2417 2406 – 2428 3 2422 2411 – 2433 4 2427 2416 – 2438 5 2432 2421 – 2443 6 2437 2426 – 2448 7 2442 2431 – 2453 8 2447 2436 – 2458 9 2452 2441 – 2463 10 2457 2446 – 2468 11 2462 2451 – 2473 12 2467 2456 – 2478 13 2472 2461 – 2483 14 2484 2473 – 2495 (Japan only) ===================== ======================= ========================= .. _channels_g_step5: .. tab-set:: .. tab-item:: List of channel widths * channel widths .. _channels_g_step6: .. tab-set:: .. tab-item:: List of Bands (802.11g) ======================= ====================== ====================== =========================== Band Name Frequency Range (GHz) Frequency Range (MHz) Channels ======================= ====================== ====================== =========================== 2.4 GHz ISM Band 2.400 – 2.4835 2400 – 2483.5 1 – 14 (region-dependent) ======================= ====================== ====================== =========================== .. _channels_g_step17: .. tab-set:: .. tab-item:: Reference links * Reference links