Nortel BayStack 450-24T Using Manual page 326

Using the BayStack 450 10/100/1000 Series Switch
There are two 1000BASE-LX (longwave gigabit) MDA models (Figure C-4):
•
•
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
(5 kilometer/3.1 mi) or multimode (550 meter/1,805 ft) fiber optic cable.
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 C-22).
450-1LR MDA
(1-port redundant)
450-1LX MDA
(single port)
Figure C-4.
Table C-4 describes the 1000BASE-LX MDA components and LEDs.
C-10
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.
1000BASE-LX 1000BASE-LX
TX RX TX
4
1000BASE-LX
TX
4
1000BASE-LX MDA Front Panels
1 2
Link
Phy Select
Activity
RX
450-1LR MDA
3
1 2
Link
Phy
Activity
RX
450-1LX MDA
3
BS45045A
309978-D Rev 01