Gigabit Ethernet

(redirected from 802.3ab)

Gigabit Ethernet

An Ethernet standard that transmits at 1 gigabit per second. Gigabit Ethernet (GbE, GE) connects PCs and servers in local networks and is commonly employed along with a mix of 10/100 Mbps devices. For example, a 10/100/1000 switch supports all three rates and adjusts to the highest speed between sender and receiver. All new computers and most network devices support Gigabit Ethernet.

GbE transmits full duplex from point to point using Ethernet switches and half duplex in a shared Ethernet hub environment (see CSMA/CD).

IEEE 1000Base-T (802.3ab)
The 1997 standard (IEEE 802.3z) required multimode fiber or shielded copper cables, but two years later, 1000Base-T enabled GbE to run on ordinary Cat 5 copper and be readily used in existing networks. Four wire pairs each transmit 250 Mbps in both directions.

TIA 1000Base-TX
A competing standard created by the TIA that never caught on used simpler electronics but required Cat 6 cabling. However, 1000Base-T is often erroneously labeled 1000Base-TX. See Ethernet and 10 Gigabit Ethernet.

COPPER CABLEEncoding   Cable  RangeStandard     Method     Type  (meters)1000Base-T802.3ab      4D-PAM5  Cat5-UTP  100

   1000Base-TXTIA/EIA-854  4D-PAM5  Cat6-UTP  100

   1000Base-CX802.3z       8B/10B   Cat1-STP   25

   OPTICAL CABLE (8B/10B Encoding)Fiber            ModalDiameter       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

   62.5 multimode   500        550
   50 multimode     400        500
   50 multimode     500        550
    9 singlemode    ---       5000
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References in periodicals archive ?
For instance, IEEE 802.3ab test standards are now confirmed on the report to give customers reassurance that the transmission tests comply.
Completed in 18 months, IEEE 802.3bz-2016 supports the growing need for Ethernet connectivity over structured twisted pair wiring beyond the 1 Gb/s capability provided by the IEEE 802.3ab standard (1000BASE-T), which is considered by many to be the most successful Ethernet physical layer standard.
IEEE compliance: 802.3, 802.3u, 802.3x, 802.1Q, 802.3ad, 802.3ab
They meet or exceed IEEE 802.3ab and ANSI X3.263 standards.
From a speed perspective, Ethernet and the new 802.3z, 802.3ab Gigabyte Ethernet standard will far surpass the speed capabilities of IEEE 488.
National's DP83016 interfaces directly to the National's PHY solutions (the DP83864 Quad GigPHYTER) layer through the IEEE 802.3 Standard Media Independent Interface (MII), the IEEE 802.3ab Gigabit Media Independent Interface (GMII), reduced Gigabit GMII (RGMII) interface, ten bit interface (TBI) as well as Reduced Ten Bit Interface (RTBI).
* Be free from Bit Errors as defined by the IEEE 802.3ab Standard.
Designed for compliance with the Institute of Electrical and Electronic Engineers 802.3ab and 802.3z specifications, Intel's single-chip controller provides support for copper- or fiber-based connections at speeds of 10, 100 or 1000 Mbps.