Nortel 450-24t 用户指南
Media Dependent Adapters
309978-D Rev 01
C-19
Replacing an MDA
When replacing an installed MDA:
1.
Power down the switch.
Remove the AC power cord from the power source.
2.
Remove the installed MDA.
Loosen the thumbscrews and remove the MDA.
3.
Install the replacement MDA.
Be sure to firmly tighten the two thumbscrews on the MDA front panel.
4.
Power up the switch.
Installing GBICs
This section describes how to install gigabit interface converters (GBICs) on your
450-1GBIC MDA’s Host port.
450-1GBIC MDA’s Host port.
Refer to Table C-7 for a list of supported GBIC models that you can order from
Nortel Networks.
Nortel Networks.
Note:
For more information about supported GBICs and for details about
cabling specifications, refer to the Gigabit Interface Converter (GBIC)
Installation Guide (part number 208723-A).
Installation Guide (part number 208723-A).
Table C-7.
Available GBIC Models
Model number
Description
Part number
1000BASE-SX
Uses shortwave 850 nm fiber optic connectors to connect devices
over multimode (550 m/1805 ft) fiber optic cable.
over multimode (550 m/1805 ft) fiber optic cable.
AA1419001
1000BASE-LX
Uses longwave 1300 nm fiber optic connectors to connect
devices over single mode (5 km/3.1 mi) or multimode (550 m/
1805 ft) fiber optic cable.
devices over single mode (5 km/3.1 mi) or multimode (550 m/
1805 ft) fiber optic cable.
AA1419002
1000BASE-XD
Uses single mode fiber to connect devices over distances up to
50 km (31 mi), depending on the quality of the cable.
50 km (31 mi), depending on the quality of the cable.
AA1419003
1000BASE-ZX
Uses single mode fiber to connect devices over distances up to
70 km (43 mi), depending on the quality of the cable. The ports
operate in full-duplex mode only.
70 km (43 mi), depending on the quality of the cable. The ports
operate in full-duplex mode only.
AA1419004