Nortel Networks 450 - Manual (Page 256)

Using the BayStack 450 10/100/1000 Series Switch
C-10 302401-D Rev 00
There are two 1000BASE-LX (longwave gigabit) MDA models ( Figure C-4 ):
• 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 conform to the IEEE 802.3z 1000BASE-LX standard and use
longwave 1300 nm fiber optic connectors to connect devices over single mode
(3 kilometer) or multimode (550 meters) fiber optic cable.
Figure C-4. 1000BASE-LX MDA Front Panels
Table C-4 describes the 1000BASE-LX MDA components and LEDs.
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 C-13 )
1000BASE-LX
TX RX
Phy
Link
Activity
450-1LX MDA
BS45045A
3 4
2 1
TX RX
1000BASE-LX
RX
1000BASE-LX
TX
Activity
Link
Phy Select
450-1LR MDA
3 4
2 1
450-1LR MDA
(1-port redundant)
450-1LX MDA
(single port)
kombk.book Page 10 Tuesday, June 29, 1999 3:25 PM