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Shortwave Gigabit Models
The two 1000BASE-SX (shortwave gigabit) MDA models
are:
• 450-1SR MDA -- single MAC MDA with a separate
redundant Phy (backup Phy port). Only one Phy port
can be active at any time. If the active Phy port fails,
the redundant Phy port automatically becomes the
active port.
• 450-1SX MDA -- single PHY MDA.
Both models conform to the IEEE 802.3z 1000BASE-SX
standard and use shortwave 850 nm fiber optic connectors
to connect devices over multimode (550 m/1805 ft) fiber
optic cable.
Figure 7 shows the 450-1SR MDA and the 450-1SX
MDA.