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device, such as a computer, is not active. Second, it detects cable length and adjusts the power used for transmission accordingly. Standard switches provide enough power to send a signal up to 100 meters (330 ft). However, this is often unnecessary in the SOHO environment, where 5 to 10 meters (16 to 33 ft) of cabling are typical between rooms. Moreover, small data centers can also benefit from this approach since the majority of cabling is confined to a single room with a few meters of cabling among servers and switches. In addition to the pure power-saving benefits of Green
Ethernet, backing off the transmit power on shorter cable runs reduces alien crosstalk and improves the overall performance of the cabling system.
151:. The PHY will then send LPI symbols for a specified time onto the link, and then disable its transmitter. Refresh signals are sent periodically to maintain link signaling integrity. When there is data to transmit, a normal IDLE signal is sent for a predetermined period of time. The data link is considered to be always operational, as the receive signal circuit remains active even when the transmit path is in sleep mode.
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Green
Ethernet technology was a superset of the 802.3az standard. In addition to the link load power savings of Energy-Efficient Ethernet, Green Ethernet works in one of two ways. First, it detects link status, allowing each port on the switch to power down into a standby mode when a connected
146:
as transmitters are active regardless of whether data is being sent. If they could be put into sleep mode when no data is being sent, that energy could be saved. When the controlling software or firmware decides that no data needs to be sent, it can issue a low-power idle (LPI) request to the
80:
task force, developed the standard. The first study group had its call for interest in
November 2006, and the official standards task force was authorized in May 2007. The IEEE ratified the final standard in September 2010. Some companies introduced technology to reduce the power required for
530:
For example, when connected and subsequently powered down, the DGS-2208 multi-port desktop switch can realize up to 80 percent savings in power usage*, and the other D-Link 'Green
Ethernet' switches can save up to 45 percent in power
281:
167:
on
Ethernet interface cards intended for network servers. In April 2008, the term was used for switches, and, in July 2008, used with wireless routers that featured user-selectable off periods for
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that reduce power consumption during periods of low data activity. The intention is to reduce power consumption by at least half, while retaining full compatibility with existing equipment.
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31:
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Projected power savings of up to 80 percent were predicted using Green
Ethernet switches, translating into a longer product life due to reduced heat.
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in the United States (in computers, switches, and routers) used an estimated 5.3 terawatt-hours of electricity. According to a researcher at the
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514:"D-Link First Company to Offer 'Green Ethernet™' Technology for Network Connectivity, Embrace Energy-Saving Initiatives"
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230:"Energy Efficient Ethernet hits standards milestone — InternetNews:The Blog — Sean Michael Kerner"
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Green
Ethernet also encompasses the use of more efficient circuitry in Ethernet chips, and the use of
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IEEE SpectrumEnergy-Efficient
Ethernet: Ethernet connections waste lots of watts. It need not be so
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464:. Cisco Systems. August 1, 2006. Specifications and Connection Limits for 100-Mbps Transmission
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118: million a year in energy costs in the US. Most of the savings would come from homes (
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were developed before the IEEE 802.3az Energy-Efficient
Ethernet standard was finalized.
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Blog for Energy-Efficient
Ethernet techniques and news analyses, circa 2009.
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458:"Ethernet 100BaseTX and 10BaseT Cables: Guidelines and specifications"
282:"IEEE ratifies new 8023az standard to reduce network energy footprint"
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and faster links, constant and significant energy is used by the
1003:
382:
607:
587:
148:
114:, Energy-Efficient Ethernet can potentially save an estimated
312:"Top OEMs 'Go Green' With Broadcom's 65nm SMB Switch Family"
484:"D-Link First Company to Offer Green Wi-Fi Home Networking"
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Ethernet before the standard was ratified, using the name
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The power reduction is accomplished in a few ways. In
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408:"Energy-efficient Ethernet standard gains traction"
314:(Press release). Broadcom Corporation. June 3, 2009
578:IEEE P802.3az Energy Efficient Ethernet Task Force
260:"IEEE 802.3 Energy Efficient Ethernet Study Group"
74:Institute of Electrical and Electronics Engineers
27:Power-saving option for Ethernet network devices
34:Logo of the study group and standard task force
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8:
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604:
516:. D-Link. October 24, 2007. Archived from
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329:
401:
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338:"Broadcom Energy Efficiency Initiatives"
490:. D-Link. July 28, 2008. Archived from
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171:to further reduce energy consumption.
228:Sean Michael Kerner (July 17, 2009).
7:
1029:
147:Ethernet controller physical layer
689:200, 400, 800 and 1600 Gbit/s
336:Nicholas Ilyadis (April 1, 2010).
126: million), and the remaining
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288:. October 5, 2010. Archived from
130: million from data centers.
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1017:
1016:
67:Ethernet physical-layer variants
543:Kenney, Brad (April 11, 2008).
373:Prachi Patel-Predd (May 2008).
184:Autonomous peripheral operation
436:. O'Reilly. pp. 119–120.
434:Ethernet: The Definitive Guide
50:) is a set of enhancements to
1:
1072:Computers and the environment
406:Merritt, Rick (May 8, 2008).
108:network interface controllers
88:Some energy-efficient switch
122: million) and offices (
112:Lawrence Berkeley Laboratory
375:"Energy-Efficient Ethernet"
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462:Cisco 10000 Series Routers
432:Spurgeon, Charles (2014).
99:
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44:Energy-Efficient Ethernet
939:SFP/SFP+/QSFP/QSFP+/OSFP
684:40 and 100 Gbit/s
35:
679:25 and 50 Gbit/s
669:2.5 and 5 Gbit/s
33:
262:. September 21, 2007
218:IEEE 802.3 Clause 78
102:IT energy management
76:(IEEE), through the
1067:Energy conservation
286:Lightwaveonline.com
199:Power over Ethernet
194:One Watt Initiative
90:integrated circuits
40:computer networking
639:local area network
292:on October 9, 2011
36:
1044:
1043:
896:Energy Efficiency
751:Ethernet Alliance
234:Internetnews blog
106:In 2005, all the
96:Potential savings
16:(Redirected from
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586:. Archived from
584:"Green Ethernet"
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551:. Archived from
545:"Green Ethernet"
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664:1 Gbit/s
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140:Fast Ethernet
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64:optical fiber
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32:
19:
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926:Transceivers
895:
869:Applications
772:Twisted pair
720:Flow control
641:technologies
592:. Retrieved
588:the original
557:. Retrieved
553:the original
549:IndustryWeek
548:
538:
529:
522:. Retrieved
518:the original
508:
496:. Retrieved
492:the original
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466:. Retrieved
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415:. Retrieved
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386:. Retrieved
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349:the original
316:. Retrieved
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290:the original
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264:. Retrieved
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242:. Retrieved
238:the original
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78:IEEE 802.3az
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71:
52:twisted-pair
47:
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37:
916:Synchronous
891:Data center
1051:Categories
967:Interfaces
901:Industrial
881:Automotive
860:Long Reach
782:First mile
746:IEEE 802.3
637:family of
468:August 29,
206:References
100:See also:
855:LattisNet
850:100BaseVG
825:10BASE-FL
820:10BASE-FB
815:10BROAD36
715:EtherType
60:backplane
56:twinaxial
1062:Ethernet
1057:IEEE 802
1023:Category
798:Historic
787:10G-EPON
635:Ethernet
412:EE Times
345:Broadcom
178:See also
134:Concepts
1035:Commons
886:Carrier
835:10BASE2
830:10BASE5
810:StarLAN
805:CSMA/CD
777:Coaxial
698:General
594:July 5,
559:July 5,
524:July 5,
498:July 5,
417:July 5,
388:July 5,
358:July 5,
318:July 5,
296:July 5,
266:July 5,
244:July 5,
124:US$ 170
120:US$ 200
116:US$ 450
18:802.3az
944:XENPAK
730:Jumbos
725:Frames
647:Speeds
531:usage.
440:
128:US$ 80
62:, and
999:XGMII
911:Power
906:Metro
876:Audio
845:FOIRL
767:Fiber
760:Media
352:(PDF)
341:(PDF)
201:(PoE)
169:Wi-Fi
72:The
1004:XAUI
994:GMII
934:GBIC
596:2011
561:2011
526:2011
500:2011
470:2010
438:ISBN
419:2011
390:2011
383:IEEE
360:2011
320:2011
298:2011
268:2011
246:2011
989:MII
984:MDI
979:EAD
974:AUI
958:CFP
953:XFP
840:MAU
149:PHY
48:EEE
38:In
1053::
948:X2
547:.
528:.
486:.
460:.
410:.
398:^
381:.
377:.
343:.
328:^
284:.
232:.
85:.
58:,
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42:,
946:/
627:e
620:t
613:v
598:.
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322:.
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46:(
20:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
