Cisco Presentation Guide
Cisco Presentation Guide
Cisco Presentation Guide
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1000BaseX (802.3z ( 802.3z): : Fiber Optics<br />
•extends extends the original LAN technology to<br />
distances that make Ethernet a WAN/MAN<br />
standard<br />
•1000BASE-<br />
1000BASE-SX SX<br />
•850nm 850nm laser/LED, laser/LED,<br />
MM fiber, SC – low cost<br />
•distances distances 220-550m (better better for 50/125 than 62.5/50<br />
fiber) fiber)<br />
•1000BASE-<br />
1000BASE- LX<br />
•1310nm 1310nm laser SM fiber (5km) or MM fiber (500m), (500m) ,<br />
SC<br />
•8B10B+NRZ 8B10B+NRZ ("level-driven") encoding<br />
•Some Some bit combination have alternative 8B10B<br />
codewords<br />
•chosen chosen dynamically to reach balanced bit pattern<br />
•Because Because of high rate,1s rate, s and 0s 0 encoded with low and<br />
high power instead of presence/absence of light<br />
© 2005 Petr Grygarek, Advanced Computer Networks Technologies<br />
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