Multiplexed Fiber Optic
Communications Fundamentals - CacheFly
Communications Fundamentals - CacheFly
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• Immune to electrical<br />
interference<br />
Direct <strong>Fiber</strong> <strong>Optic</strong><br />
• Fast (latency < 5 µs / km)<br />
• Initial costs proportional<br />
to distance<br />
• Low maintenance<br />
• Long distances (> about<br />
80 miles) need repeaters<br />
Works well for all protection and control schemes<br />
• Similar to direct<br />
fiber optic<br />
• Slight additional<br />
delay introduced<br />
<strong>Multiplexed</strong> <strong>Fiber</strong> <strong>Optic</strong><br />
OPX<br />
POTT<br />
DCB<br />
87L<br />
Data<br />
• Spreads costs over more users<br />
• Self-healing ring improves<br />
reliability – SONET is most deterministic<br />
• Increases complexity, cost<br />
MUX<br />
<strong>Optic</strong>al<br />
<strong>Fiber</strong><br />
Link<br />
MUX<br />
• Long distances (> about 80 miles) need repeaters<br />
Works well for all protection and control schemes<br />
OPX<br />
POTT<br />
DCB<br />
87L<br />
Data<br />
4
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