125 High Speed Mode

125 High Speed Mode

125 High Speed Mode (or 125HSM) is Broadcom's proprietary frame-bursting and compression technology to improve 802.11g wireless LAN performance. The throughput transmission speed limit when using 125HSM is claimed to be up to 35%-40% higher than standard 802.11g.

The "125" in "125 High Speed Mode" refers to performance at a theoretical signaling rate of 125 Mbit/s: a 125HSM device can actually achieve a maximum throughput of up to (or greater than) 34.1 Mbit/s, which is the equivalent throughput of a system strictly following all 802.11g protocols and operating at a signaling rate of 125 Mbit/s.

When 125HSM was originally announced in 2004, it was called Afterburner. It's currently marketed as a proprietary extension of Broadcom's Xpress technology, their standards-based frame-bursting approach that is supported by their 54g Wi-Fi chipsets. Other vendors have marketed 125HSM products under a variety of names:

* g+ SuperSpeed (ZyXEL)
* G Plus or HSM (Belkin)
* 125* High Speed or Turbo G ( Buffalo)
* SpeedBooster (Linksys)
* 125 Mbit/s 802.11g

(It is not the same as "Super-G" or "108 Mbit/s" technology.) [http://www.techworld.com/mobility/features/index.cfm?FeatureID=641]

Manufacturers that have licensed 125HSM technology from Broadcom include Belkin, Buffalo Technology, Dell, Gateway, Hewlett-Packard, Asus, Linksys (now part of Cisco Systems), Motorola, and U.S. Robotics. In general, 125HSM products from different vendors are all interoperable in 125HSM mode.

125HSM is one of several competing proprietary approaches that were developed to increase 802.11g performance of wireless devices, such as MIMO-based extensions from Airgo Networks, Nitro from Conexant, and Super G from Atheros. 125HSM can be more successful in radio-dense environments than non-standard channel bonding approaches to enhance 802.11g performance. Broadcom claims that in the real-world, 125HSM provides up to 17% better performance over channel bonding approaches such as Super G because other ISM band devices—such as neighboring wireless networks, cordless telephones, baby monitors, and Bluetooth devices—can interfere with channel bonding at distances of up to convert|150|ft|m.

External links

* Press release announcing 125HSM as [http://www.broadcom.com/press/release.php?id=507846 Afterburner]
* [http://www.54g.org/about_54g_speed.php 125 High Speed Mode] page within the [http://www.54g.org/ 54g Wi-Fi technology] site
* [http://www.usr.com/download/whitepapers/maxg-keylabs.pdf KeyLabs benchmark comparison] of 125 Mbit/s products by US Robotics, Linksys, Netgear, Belkin, and DLink. Also comparisons to some "Draft 802.11n" competitors.
* Article at SmallNetBuilder (formerly Tom's Hardware Guide) [http://www.smallnetbuilder.com/content/view/24649/96/1/9/ testing 125HSM performance]


Wikimedia Foundation. 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • High-speed rail in the United Kingdom — The United Kingdom has four classic main railway lines operating at convert|125|mph|km/h|sigfig=2, plus convert|108|km|mi|sigfig=1 of High Speed 1 high speed line.The fastest current UK domestic services operate at convert|125|mph|km/h|sigfig=2… …   Wikipedia

  • High-speed rail in the United States — Development of high speed rail in the United States can be traced back to the streamliners in the 1930s, 1940s, and 1950s. These systems, in turn, can be traced further back to the competing companies operating different routes between London and …   Wikipedia

  • High-speed rail by country — This article provides of a list of operating High speed rail networks, listed by country. High speed rail is public transport by rail at speeds in excess of 200 km/h (125 mph) [ [http://www.uic.asso.fr/gv/article.php3?id article=14 General… …   Wikipedia

  • High-speed, Anti-Radiation Missile — AGM 88 HARM Pour les articles homonymes, voir HARM. AGM 88 HARM …   Wikipédia en Français

  • High-definition television — Logo High definition television (HDTV) is video that has resolution substantially higher than that of traditional television systems (standard definition television). HDTV has one or two million pixels per frame, roughly five times that of SD… …   Wikipedia

  • Multi-mode optical fiber — A 1.25 Gbit/s multi mode fiber Multi mode optical fiber (multimode fiber or MM fiber or fibre) is a type of optical fiber mostly used for communication over short distances, such as within a building or on a campus. Typical multimode links… …   Wikipedia

  • Need for Speed: Hot Pursuit (2010 video game) — This article is about the 2010 video game. For other uses, see Need for Speed: Hot Pursuit (disambiguation). Need for Speed: Hot Pursuit European cover art Developer(s) Criterion Games …   Wikipedia

  • Film speed — is the measure of a photographic film s sensitivity to light, determined by sensitometry and measured on various numerical scales, the most recent being the ISO system. A closely related ISO system is used to measure the sensitivity of digital… …   Wikipedia

  • Current mode logic — (CML), or source coupled logic (SCL), is a differential digital logic family intended to transmit data at speeds between 312.5 Mbit/s and 3.125 Gbit/s over a standard printed circuit board.[1] CML termination scheme The transmission …   Wikipedia

  • Need for Speed: Shift — Developer(s) Slightly Mad Studios EA Bright Light (PSP) Publisher(s) Electronic Arts …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”