An Ethernet standard that transmits at 1 Gbps. Used mostly to connect high-end workstations and servers as well as for network backbones, Gigabit Ethernet transmits full duplex from point to point using switches and half duplex in a shared environment (CSMA/CD) using a hub.
The first IEEE Gigabit Ethernet standard (802.3z) was defined in 1997 for use over multimode optical fiber and two years later for copper cables.
1000Base-T and 1000Base-TX
In 1999, the IEEE 802.3ab standard (1000Base-T) enabled Gigabit Ethernet to run over Category 5 copper cable and be readily used in 10/100 Ethernet networks without changing cables. The TIA/EIA later introduced 1000Base-TX, which did not catch on. It required Category 6 cabling, but greatly simplified the circuitry by using a different transmission method. In 1000Base-T, each of four wire pairs transmits 250 Mbps in both directions. In 1000Base-TX, two pairs transmit at 500 Mbps, and two receive at 500 Mbps.
The maximum distance between nodes is based on the type of transceiver and cable used as outlined below.
The first IEEE Gigabit Ethernet standard (802.3z) was defined in 1997 for use over multimode optical fiber and two years later for copper cables.
1000Base-T and 1000Base-TX
In 1999, the IEEE 802.3ab standard (1000Base-T) enabled Gigabit Ethernet to run over Category 5 copper cable and be readily used in 10/100 Ethernet networks without changing cables. The TIA/EIA later introduced 1000Base-TX, which did not catch on. It required Category 6 cabling, but greatly simplified the circuitry by using a different transmission method. In 1000Base-T, each of four wire pairs transmits 250 Mbps in both directions. In 1000Base-TX, two pairs transmit at 500 Mbps, and two receive at 500 Mbps.
The maximum distance between nodes is based on the type of transceiver and cable used as outlined below.
8B/10B Encoding
Fiber Modal
Diameter Bandwidth Range
(microns) (MHz-km) (meters)
1000Base-SX (802.3z)
62.5 multimode 160 220
62.5 multimode 200 275
50 multimode 400 500
50 multimode 500 550
1000Base-LX (802.3z)
62.5 multimode 500 550
50 multimode 400 500
50 multimode 500 550
9 singlemode --- 5000
1000Base-CX (802.3z)
Shielded twisted 25
pair copper
1000Base-T Encoding
1000Base-T (802.3ab)
Category 5 UTP 100
1000Base-TX (TIA/EIA-854)
Category 6 UTP 100
 | Reproduced with permission from Computer Desktop Encyclopedia. Copyright (c) 1981-2008 The Computer Language Company Inc. All rights reserved. |
Additional Resources
- Ten key differences between Linux and Windows
- Before debating the relative merits and shortcomings of Linux and Windows, it helps to understand the real distinctions between them. Before debating the relative merits and shortcomings of Linux and Windows, it helps to understand the real distinctions between them. Here are the key differences distilled into one list....
- News items 2008-09-04
- Sony Vaio JS190J (silver)
- Finally, a Windows-based all-in-one earns our admiration. We've seen new all-in-one PCs from Hewlett-Packard and Averatec this year, and Apple also refreshed its popular iMac. None of them deliver as much in the way of features and performance as Sony's new, $1,499 Vaio JS190J. A full-size desktop processor helps make...
- Product reviews 2008-09-03
- Canon, Epson add Wi-Fi to new multifunction printers
- Built-in wireless networking capability is slowly infiltrating the home printer market. At the end of last year, we highlighted a dirt-cheap monochrome laser, the Brother HL-2170W, and both Canon and Epson have recently announced a handful of new all-in-one inkjet printers that also feature built-in 802.11b/g Wi-Fi. These four multifunction...
- Blog posts 2008-09-03
- Acer Aspire X1200-U1520A
- The Acer Aspire X1200 line of minidesktops fits budget PC components inside a compact case and offers some features that let it act as a light home theater companion. Our $450 review model came with a dual-core AMD processor, 4GB of memory, and 64-bit Windows Vista, which make it...
- Product reviews 2008-09-02
- Fujitsu Lifebook T1010
- Combining a screen that's roomy enough to avoid eye strain and a weight that's still reasonable enough to carry to the coffee shop or on the occasional business trip, 13.3 inches may be the most perfect size for a laptop. How much better, then, that Fujitsu has issued the LifeBook...
- Product reviews 2008-08-29
- Fujitsu LifeBook A6120 (2.26GHz Intel Core 2 Duo P8400)
- The Fujitsu LifeBook A6210's $1,349 price tag may seem a bit high for a midsize laptop, especially considering that many similarly sized systems cost less than $1,000. But the Fujitsu has a number of features that help justify the higher price: namely, a built-in Blu-ray drive, ATI Mobility Radeon HD...
- Product reviews 2008-08-29
- Serial Control Center (exe)
- Control Center application has the ability to test several communication devices up to a maximum of 36 ports. Console is layout with many drop down menus making setup a breeze. Great application to test any serial device or use it as a tool to burn in several devices all at...
- Software downloads 2008-08-29
- Dell XPS M1330-126B
- Note: This review is part of our Back to School 2008 roundup, covering specific configurations of popular laptops that can be found in retail stores.While 13-inch laptops make up only a small part of the market, Apple's popular MacBook has made this form factor, which we call thin-and-light, a staple...
- Product reviews 2008-08-26
- Malware detected at the International Space Station
- Malware is reaching new heights, and going into Space through a removable media carrying the W32.Gammima.AG password stealing malware to the International Space Station. According to SpaceRef.com : "W32.Gammima.AG worm is a level 0 gaming virus intended to gather personal information. Virus was never a threat to any of...
- Blog posts 2008-08-26
- Go ahead...bring in your laptop
- Go ahead...bring in your laptopWe allow people to use their ownso long as they allow me to install security software and updates and inspect the machines at my discretion. Those who do use their own see this as me doing them a favor, not the other way around.I use my...
- Discussion threads 2008-08-26
- One Router to Connect Them All
- One Router to Connect Them AllWives and out of townI have the same problem. I usually get infuriating phone calls where I have to talk her through the whole device reboot process each time, and she forgets how to do it.God awful from where I liveRead my "Harsh reality of...
- Discussion threads 2008-08-26
- One Router to Connect Them All
- Sunday afternoons are the few times I actually get some peace and don't have to think about major IT problems. I fire up my Weber smoker, throw on a couple of racks of ribs, fire up a bucket of hardwood charcoal and fruit wood chunks, and I chill for a...
- Blog posts 2008-08-25
- Qwest CTO on FTTP, bandwidth caps and integrated services
- Qwest plans to roll out integrated home services where it ties its services in with those from its partners such as MSN and DirecTV in a move enabled by a thin layer of software, according to Qwest CTO Pieter Poll. Poll right talked about Qwest's broadband strategy...
- Blog posts 2008-08-25
- Maxtor Central Axis NAS server
- The Maxtor Central Axis carries a list price of $320, but can be found for as little as $270--a good deal for a network storage device with 1TB of storage. We liked the Central Axis' compact design, fast performance, and that its over-the-Internet access service was easy to set...
- Product reviews 2008-08-22
- Floodless in SEATTLE: A Scalable Ethernet Architecture for Large Enterprises
- IP networks require massive effort to configure and manage. Ethernet is vastly simpler to manage, but does not scale beyond small local area networks. This paper describes an alternative network architecture called SEATTLE that achieves the best of both worlds: The scalability of IP combined with the simplicity of Ethernet....
- White papers 2008-08-22
- Sprint Airave
- Since a cell phone is practically useless without good signal strength, a signal booster is sometimes required to boost it. We've seen plenty signal boosters here at CNET, from the Wi-Ex zBoost YX510-PCS-CEL to the ARC Freedom Antenna. However, Sprint has decided to release device to boost the signal of...
- Product reviews 2008-08-21
- Life without the Internet: Zapped off the grid
- In my last article I described what it feels like to have your house struck by lightning. Luckily there were no injuries or structural damage thanks for your kind words in the comments, but our gadgets and other electronics inside the house weren't so lucky. This is their tale. ...
- Blog posts 2008-08-20
- Insignia NS-BRDVD
- Pundits debate whether Blu-ray will be as successful as DVD, but they're relatively united on one issue: the prices of the players need to drop before the format takes off. The Insignia NS-BRDVD is part of a new breed of bargain players we've seen this year, and its $300 list...
- Product reviews 2008-08-18
- HP Pavilion Elite m9300t
- At its core, our $1,100 HP Pavilion Elite m9300t review unit is a reasonably priced example of HP's midrange desktop. It gives you about $900 worth of basic computer, and an extra $200 in home theater-style extras. The good news is that this system is configurable, so if, like us,...
- Product reviews 2008-08-18
- Surviving a lightning strike: Shock and awe
- Surviving a lightning strike: Shock and awe.....So what, you lost some electronics and doo dads. You and your's are alive, that's what is important. The electronics can be replaced, repaired and data recovered from back-ups I know you have them. The fact that you consider losing your electronics harmful is...
- Discussion threads 2008-08-18
Neighboring Terms
Premier Vendor Content Whitepapers, webcasts & resources from our Power Center Sponsors
- ZDNet News Videos
-
Tech news covering the latest in products, conferences and blog commentary, from ZDNet video.
- Watch the latest video >>
- Access the latest Intel and industry best practices
-
Designed specifically to address the concerns of senior IT managers at organizations with more than 100 employees, the Intel Premier IT Professional Program provides best practices via local and e-Seminars and a members-only Web site.
- View the Intel Premier IT Professional web-site tour >>
- Sports and Technology
-
Major League Baseball pitches new app to iPhone users
At Apple's Worldwide Developers Conference in San Francisco, Jeremy Schoenherr of MLB.com demos At-Bat, a new iPhone app from Major League Baseball.
View the ZDNet video to learn more -
The SF Giants' new hi-tech ballpark
SF Giants CIO Bill Schlough discusses new technology upgrades at AT&T Park and outlines his dual role- managing technology operations at the backend while using hi-tech to improve player performance on the field.
View the ZDNet CIO Vision Series video - From our Sponsors
- Fantasy Football
-
-
3 Great Ways To Play Fantasy Football
Play for free, play to win cash prizes- up to $3500, or customize your own league.
Learn More » -
