SMC Networks SMC8124PL2 manual Application Notes, Making Vlan Connections

2 Network Planning

R&D

VLAN 1

Tagged

Ports

Finance

VLAN 2

Testing

VLAN 3

VLAN 4

Untagged Ports Tagged Port

VLAN

unaware

switch

Marketing

Finance

VLAN 3

VLAN aware switch

R&D

Testing

VLAN 1

VLAN 2

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.For network applications that require routing between dissimilar network types, you can attach these switches directly to a multi-protocol router.

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: 10 km (3.1 miles) for single-mode fiber

•1000BASE-ZX: 80 km (62.1 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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