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DOCSIS employs a mixture of deterministic access methods for upstream transmissions, specifically time-division multiple access (TDMA) for DOCSIS 1.0/1.1 and both TDMA and S-CDMA for DOCSIS 2.0 and 3.0, with a limited use of contention for bandwidth reservation requests. In TDMA, a cable modem requests a time to transmit and the CMTS grants it ...
Wireless devices, BPL, and modems may produce a higher line rate or gross bit rate, due to error-correcting codes and other physical layer overhead. It is extremely common for throughput to be far less than half of theoretical maximum, though the more recent technologies (notably BPL) employ preemptive spectrum analysis to avoid this and so ...
IEEE 802.11ac-2013 or 802.11ac is a wireless networking standard in the IEEE 802.11 set of protocols (which is part of the Wi-Fi networking family), providing high-throughput wireless local area networks (WLANs) on the 5 GHz band. [d] The standard has been retroactively labelled as Wi-Fi 5 by Wi-Fi Alliance. [6] [7]
a/g/n/ac (Wi-Fi 3-5) 2.4, 5.0 1200 (ax), 2400 (ax) 2 USB 3.0 1 2 1 • VDSL2, [note 5] Ethernet 4 Gigabit ax , a/g/n/ac (Wi-Fi 3-5) 2.4, 5.0 1200 (ax), 2400 (ax) 2 USB 3.0 1 2 0 [note 6] • Model WAN type WAN port LAN ports Standard Standard [note 3] Band (GHz) Max. data rate (Mbit/s) Ports Standard 3G/4G modem support FXO ports FXS ports
1998: Magic WAND project demonstrates OFDM modems for wireless LAN; 1999: IEEE 802.11a wireless LAN standard (Wi-Fi) [65] 2000: Proprietary fixed wireless access (V-OFDM, FLASH-OFDM, etc.) May 2001: The FCC allows OFDM in the 2.4 GHz license exempt band. [66] 2002: IEEE 802.11g standard for wireless LAN [67]
Smaller modems exist like those offered by Thuraya but only connect at 444 kbit/s in a limited coverage area. At $5 to $7 per megabyte on average, portable satellite internet is typically more expensive than other modes of Internet access, with modems usually costing between $1,000 and $5,000. [53]
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