Cisco Presentation Guide
Cisco Presentation Guide
Cisco Presentation Guide
You also want an ePaper? Increase the reach of your titles
YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.
1000BaseT (802.3ab)<br />
• uses TP Category 5e or higher<br />
• cat5e at5e allows 125Mbps<br />
• all four pairs, 125 Mbd each<br />
• 4D-PAM5 line encoding<br />
• pulse amplitude modulation, 5 states<br />
•2bits/symbol 2bits/symbol + Forward Error Correction (8-state ( 8-state Trellis<br />
code)<br />
• control and data symbols<br />
•250 250 Mbps/pair if 125 Mbd used<br />
• 4x in parallel (for each pair)<br />
• See http://www.reed<br />
electronics.com/tmworld/article/CA287078.html<br />
• Full ull duplex: duplex:<br />
echo cancellation, cancellation,<br />
on all pairs<br />
• 9 voltage levels in idle periods, 17 during data<br />
transmission<br />
• need to synchronize clocks (clock master elected)<br />
• probl roblems ems with reflections (danger of resonance)<br />
© 2005 Petr Grygarek, Advanced Computer Networks Technologies<br />
17
Change language