Nortel 2000, Using Manual

Page: 349 / 405

Appendix C Media dependent adapters 349
Using the Business Policy Switch 2000 Version 1.2
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 132 ) conform to the IEEE 802.3z 1000BASE-SX standard
and use shortwave 850 nm fiber optic connectors to connect devices over
multimode (550 meter) fiber optic cable.
Figure 132 1000BASE-SX MDA front panels
Table 67 describes the 1000BASE-SX components and LEDs.
1000BASE-SX
TX RX
Phy
Link
Activity
450-1SX MDA
TX RX
1000BASE-SX
RX
1000BASE-SX
TX
Activity
Link
Phy Select
450-1SR MDA
3
BS45044A
4
3 4
450-1SR MDA
(1-port redundant)
450-1SX MDA
(single port)
2 1
2 1