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3-4 © 2003 Foundry Networks, Inc. February 2003
Application Notes
1. Full-duplex operation only applies to point-to-point access
(such as when a switch is attached to a workstation, server or
another switch). When the switch is connected to a hub, both
devices must operate in half-duplex mode.
2. When a switch is connected to a hub or any kind of shared
media, you may want to turn off back pressure flow control to
prevent jamming packets from being propagated throughout
the hub.
3. As a general rule the length of fiber optic cable for a single
switched link should not exceed:
• 1000BASE-SX/LX: 550 m (1805 ft) for multimode fiber or
5 km (16404 ft) for single-mode fiber.
However, power budget constraints must also be considered
when calculating the maximum cable length for your specific
environment.