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The AirPort Time Capsule (originally named Time Capsule) is a wireless router which was sold by Apple Inc., featuring network-attached storage (NAS) and a residential gateway router, and is one of Apple's AirPort products. It is essentially a version of the AirPort Extreme with an internal hard drive.
The 6th generation AirPort Extreme (and 5th generation AirPort Time Capsule) featured three-stream 802.11ac Wi-Fi technology with a maximum data rate of 1.3 Gbit/s, which is nearly three times faster than 802.11n. Time Machine was now supported using an external USB hard drive connected to AirPort Extreme (802.11ac model only). [15]
IEEE 802.11n is an amendment to IEEE 802.11-2007 as amended by IEEE 802.11k-2008, IEEE 802.11r-2008, IEEE 802.11y-2008, and IEEE 802.11w-2009, and builds on previous 802.11 standards by adding a multiple-input multiple-output (MIMO) system and 40 MHz channels to the PHY (physical layer) and frame aggregation to the MAC layer.
The AirPort Express is a discontinued Wi-Fi base station product from Apple Inc., part of the AirPort product line. While more compact and in some ways simpler than another Apple Wi-Fi base station, the AirPort Extreme , the Express offers audio output capability the Extreme lacks.
This time period is called a beacon period (BP). At the beginning of each BP, there is a beacon generation window consisting of w + 1 {\displaystyle w+1} slots each of length aSlotTime . Each station calculates a random delay uniformly distributed in [ 0 , w ] {\displaystyle [0,w]} and is scheduled to transmit a beacon when the delay timer expires.
Wireless LAN (WLAN) channels are frequently accessed using IEEE 802.11 protocols. The 802.11 standard provides several radio frequency bands for use in Wi-Fi communications, each divided into a multitude of channels numbered at 5 MHz spacing (except in the 45/60 GHz band, where they are 0.54/1.08/2.16 GHz apart) between the centre frequency of the channel.
Wi-Fi (/ ˈ w aɪ f aɪ /) [1] [a] is a family of wireless network protocols based on the IEEE 802.11 family of standards, which are commonly used for local area networking of devices and Internet access, allowing nearby digital devices to exchange data by radio waves.
AirPort Base Station (1999) – Pogo; AirPort Express 802.11n (5th generation) – K31 [6] Apple IIe Card for the Macintosh LC – Double Exposure; Apple II 3.5" Disk Controller Card – NuMustang; Apple Color OneScanner 600/27 – Rio; Apple Color OneScanner 1200/30 – New Orleans; Beats Flex – B372; HomePod – B238; HomePod Mini – B520