SMC Networks 8028L2, Installation Manual

Page: 36 / 76

C
HAPTER
2
| Network Planning
Application Notes
– 38 –
A
PPLICATION
N
OTES
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.
Based on recommended standards, 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.
However, power budget constraints must also be considered when
calculating the maximum cable length for your specific environment.