Nortel Networks 302403-B - Manual (Page 15)

13
1000BASE-LX MDAs
There are two 1000BASE-LX (longwave gigabit) MDA
models:
• The 450-1LR 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 450-1LX MDA is a single Phy MDA.
Both models ( Figure 4 ) use longwave 1300 nm fiber optic
connectors to connect devices over single mode
(3 kilometer) or multimode (550 meters) 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.
Note: The optical performance of this transceiver
cannot be guaranteed when connected to a multimode
fiber plant without the use of the special offset SMF/
MMF mode conditioning patch cord (see
“1000BASE-LX Multimode Applications ” on page
16 ).
302403-B.mkr Page 13 Friday, January 15, 1999 2:56 PM