Gigabit Ethernet

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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 ?
The ATt-EX1001SC/GM1 extends the transmission distance for 1000Base-SX multimode fiber cable, delivering Gigabit Ethernet connectivity in compliance with IEEE 802.3z for connections up to 2 km with multimode fiber.
The Explorer uses hot-swappable snap-on GBIC connectors with duplex SC connectors for either 1000Base-SX or 1000Base-HX multimode media.
The 8-slot, 64-port stackable backbone or workgroup switch accepts three different modules, an 8-port 10Base-FL module, an 8-port 100Base-FX module, and a 1-port gigabit module for 1000Base-SX multimode fiber.
The StellarSwitch SGX8216 features 16 10/100 Mbps autosensing ports, two Gigabit Ethernet ports supporting 1000Base-SX or 100Base-LX connections, and a modular slot for an optional WAN port for T1/E 1 connections.
Two fiber-optic standards are approved: 1000Base-SX for short-wave-length lasers over multimode fiber and 1000Base-LX for long-wavelength lasers over multimode or single-mode fiber.
The 802.3z standard defines two basic modes: the 1000Base-LX uses long-wavelength laser transceivers to support links of up to 550 meters with multi-mode fiber and 5 km with single-mode fiber; 1000Base-SX employs short-wavelength laser transceivers to support links of 220 to 550 meters with multimode fiber, depending on its bandwidth.
Using a Gigabit Ethernet media converter enables converting one or more 1000BASE-SX ports on a Gigabit Ethernet switch to 1000BASE-LX for use in campus area networks or other applications requiring the distance advantages of singlemode fiber.
* Gigabit Ethernet will travel up to 260 meters over 62.5 micron multimode fiber when the 802.3z standard is finally approved for 1000Base-SX (62.5 micron fiber is common to the vast majority of installations in North America).
* 1000Base-SX employs short-wavelength laser transceivers to support links of 300 to 500 meters with multimode fiber;