SMC Networks TIGERSWITCH SMC8648T - Manual (Page 36)

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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 550 m (1805 ft) for multimode fiber or 5 km
(16404 ft) for single-mode fiber. For longer connections, you can use a
1000BASE-ZX SFP transceiver, which supports runs of up to
100 kilometers.
However, power budget constraints must also be considered when
calculating the maximum cable length for your specific environment.