SMC Networks 8926EM, Installation Manual

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Application Notes
2
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. For network applications that require routing between dissimilar network types,
you can attach these switches directly to a multi-protocol router. However, if you
have to interconnect distinct VLANs or IP subnets, you can take advantage of
the wire-speed Layer 3 routing provided by these switches.
3. As a general rule, the length of fiber optic cable for a single switched link should
not exceed:
• 1000BASE-SX: 550 m (1805 ft) for multimode fiber
• 1000BASE-LX: 5 km (3.1 miles) for single-mode fiber
• 1000BASE-LH: 70 km (43.5 miles) for single-mode fiber
• 10GBASE-SR: 300 m (984 ft) for multimode fiber
• 10GBASE-LR: 10 km (6.2 miles) for single-mode fiber
• 10GBASE-ER: 40 km (24.8 miles) for single-mode fiber
However, power budget constraints must also be considered when calculating
the maximum cable length for your specific environment.