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• The 450-1SR MDA is a 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.
• The 450-1SX MDA is a 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 meter) fiber optic
cable.
Table 5 describes the 1000BASE-SX components and
LEDs.
Table 5. 1000BASE-SX MDA Description
Item Label Description
1 Link Communication link LEDs (green):
On: Valid communications link.
Off: The communications link
connection is bad or there is no
connection to this port.
Blinking: The corresponding port is
management disabled.
(continued)
302403-C.mkr Page 15 Monday, May 24, 1999 4:30 PM