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Figure 2-4. Making VLAN Connections
Note: When connecting to a switch that does not support IEEE 802.1Q VLAN
tags, Use untagged ports.
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. Avoid using flow control on a port connected to a hub unless it is actually
required to solve a problem. Otherwise back pressure jamming signals may
degrade overall performance for the segment attached to the hub.
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 singlemode fiber.
• 1000BASE-LH: 70 km (43.5 miles) for singlemode fiber.
However, power budget constraints must also be considered when calculating the
maximum cable length for your specific environment.