SMC Networks 48-Port - Manual (Page 22)

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Figure 1-6. Single-Port 1000BASE-SX Module (SMC6900G)
Using fiber optic cable, the 1000BASE-SX port can be connected to
a remote site up to 550 m (1805 ft) away. The 1000BASE-SX
Gigabit module operates at 1 Gbps, with support for
auto-negotiation of duplex mode and flow control. This module is
fitted with an SC connector, but you can attach an ST plug to the
switch using the SC-ST Converter (Part Number: 99-012034-091)..
Optional Redundant Power Unit (SMCRPU150W)
SMC provides an optional Redundant Power Unit (RPU),
SMCRPU150W, that can supply power to the switch in the event of
failure of the internal power supply.
Power Supply Receptacles
There are two power receptacles on the rear panel of the switch.
The standard power receptacle is for the AC power cord. The
receptacle labeled “DC Input” is for the optional Redundant Power
Unit (RPU).