Nortel BayStack 450-24T Using Manual page 323

There are two 1000BASE-SX (shortwave gigabit) MDA models (Figure C-3):
•
•
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/1,805 ft) fiber optic cable.
450-1SR MDA
(1-port redundant)
450-1SX MDA
(single port)
Figure C-3.
Table C-3 describes the 1000BASE-SX components and LEDs.
For installation instructions, see "Installing an MDA" on page C-17.
309978-D Rev 01
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.
1000BASE-SX 1000BASE-SX
TX RX TX
4
1000BASE-SX
TX
4
1000BASE-SX MDA Front Panels
1 2
Link
Phy Select
Activity
RX
450-1SR MDA
3
1 2
Link
Phy
Activity
RX
450-1SX MDA
3
BS45044A
Media Dependent Adapters
C-7