Nortel Networks 302403-B - Manual (Page 12)

10
1000BASE-SX MDAs
There are two 1000BASE-SX (shortwave gigabit) MDA
models:
• 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 ( Figure 3 ) use shortwave 850 nm fiber optic
connectors to connect devices over multimode (550 meter)
fiber optic cable.
Warning: This is a Class 1 Laser/LED product. It
contains a laser light source that can injure your eyes.
Never look into an optical fiber or connector port.
Always assume that the fiber optic cable or connector
is connected to a laser light source.
302403-B.mkr Page 10 Friday, January 15, 1999 2:56 PM