Installation guide

Network Planning
2-6
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 thoughout 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.
• 100BASE-FX: 2 km (1.24 miles) for multimode fiber or 20 km (2.43 miles) for
single-mode fiber.
However, power budget constraints must also be considered when calculating
the maximum cable length for your specific environment.