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Seminar - An Overview of Communications Technologies


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Module 7 - LAN, WAN, VPN, WLAN, MAN, FDDI and Optical MANS                                                      Slide 11 of 45 _________________                                                                                  __________

                                                Ethernet LAN Evolution

Ethernet Type Speed Cable Type Maximum Length of Individual Cable Run
10Base-5 10 M bps Thick Coax 500 m
10Base-2 10 M bps Thin Coax 185 m
10Base-T 10 M bps UTP 100 m
10Base-FL 10 M bps Fiber 2000 m 
100Base-TX 100 M bps 2-Pair UTP 100 m
100Base-T4 100 M bps 4-Pair UTP 100 m
100Base-FX 100 M bps Fiber   412 m
2000 m
1000Base-SX 1000 Mbps Fiber; @ 850 nm wavelength 260 m HDX (62.5 m MMF)
260 m FDX (62.5 m MMF)
1000Base-LX 1000 Mbps Fiber; @ 1300 nm wavelength 320 m HDX
440 m FDX
1000Base-CX 1000 M bps Shielded Balanced Copper 25 m

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Ethernet is the most used networking architecture. Ethernet typically transmits at 10 or 100 M bps. A newer technology Gigabit Ethernet transmits at 1 G bps. Ethernet uses a Bus topology, Carrier Sense Multiple Access and Collision Detect CSMA/CD, and transmits a baseband signal across twisted pair, fiber-optic, thicknet and thinnet cabling. A 100 M bps form of Ethernet was developed as result of new applications such as Video Conferencing. A 1 G bps form of Ethernet was developed to connect two servers.

Thick cable: Original Ethernet cable, 1/2 inch thick

Thin Cable: Most popular type of Coax; 1/4 inch thick.