![]() In some countries, wide channels won’t be legal in 5 GHz.Īpple suggests in “Designing AirPort Extreme 802.11n Networks” that you can easily set up a combination network by using older and newer AirPort equipment. According to chipmakers I’ve spoken with, Apple has chosen to not offer wide channels at this point in 2.4 GHz, but could upgrade firmware later the 802.11n specification doesn’t require equipment makers to offer wide channels in either band. This could be limiting, because your real-world throughput might not exceed 50 Mbps, only about twice the real-world throughput of the original 802.11g-based AirPort Extreme and not nearly as much of a speed improvement as promised. ![]() Now Apple’s “ Designing AirPort Extreme 802.11n Networks” manual notes that wide channels can be used only in 5 GHz, not in the 2.4 GHz range. ![]() However, even the occasional capability to use wide channels can boost overall throughput to 100 Mbps. The latest draft of the protocol, still in progress, forces 802.11n equipment to drop from wide to normal channels if the device detects any other network using the same channels. In ideal circumstances, 802.11n can reach up to 300 Mbps of throughput by using a special wide channel mode in which 40 MHz of spectrum (two channels) are used simultaneously. The 802.11n spec ups the bandwidth ante to 65 Mbps of raw data per channel, and uses two radios and other techniques to more than double that to 150 Mbps of raw throughput. The wireless data protocols that use 2.4 GHz and 5 GHz bands divvy up spectrum into channels, each of which is about 20 megahertz (MHz) wide no spec previously allowed more than 54 megabits per second (Mbps) of raw data in a channel. The new AirPort Extreme Base Station can use either of two frequency ranges for wireless networking – 2.4 gigahertz (GHz), which is the range used for the original AirPort (802.11b), and for the original AirPort Extreme (802.11g) and 5 GHz, used for 802.11a, a standard Apple never previously supported. ) Most tellingly, one of the manuals shows that 802.11n’s highest bandwidth modes may not be available in most people’s preferred network configuration. The configuration manuals for the new 802.11n-based AirPort Extreme Base Station were posted last week on Apple’s support Web site, and they offer some insight into whether you should immediately purchase the new equipment or not. #1658: Rapid Security Responses, NYPD and industry standard AirTag news, Apple's Q2 2023 financialsĪirPort Extreme 802.11n Throughput Limits.#1659: Exposure notifications shut down, cookbook subscription service, alarm notification type proposal, Explain XKCD.#1660: OS updates for sports and security, Drobo in bankruptcy, why TidBITS doesn't cover rumors.#1661: Mimestream app for Gmail, auto-post WordPress headlines to Twitter and Mastodon, My Photo Stream shutting down.#1662: New Macs, 12 top OS features for 2023, vertical tabs in Web browsers, watchOS 9.5.1.
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