SMC Networks SMC8950EM, SMC8926EM manual Application Notes

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.

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