3Com Switch 4500 Family, Руководство по началу работы, Страница: 37 / 134

The Power-up Sequence 37
Choosing the Correct
Cables for the
1000BASE-X SFP Ports
The 1000BASE-SX SFP transceiver supports a direct connection to a
multi-mode fiber-optic cable. The 1000BASE-LX SFP transceiver supports
a direct connection to single-mode and multi-mode fiber-optic cables.
The 1000BASE-LH70 SFP transceiver supports a direct connection to a
single-mode fiber-optic cable and the 1000BASE-T SFP transceiver uses
Category 5 copper cabling with RJ-45 connectors and supports segment
lengths of up to 100 m (328 ft). Table 14 shows the range for each
connection:
Table 14 1000BASE-X SFP Port Cable Range
Fiber Type Diameter
(microns) Modal
Bandwidth
(MHz . km)
Transmission Range in meters
(in feet)
1000BASE-SX
Multi-mode 62.5 160 2m - 220m (6.6 ft - 721.8 ft)
Multi-mode 62.5 200 2m - 275m (6.6 ft - 902.3 ft)
Multi-mode 50 400 2m - 500m (6.6 ft - 1640.5 ft)
Multi-mode 50 500 2m - 550m (6.6 ft - 1804.6 ft)
1000BASE-LX
Multi-mode 62.5 500 2m - 550m (6.6 ft - 1804.6 ft)
Multi-mode 50 400 2m - 550m (6.6 ft - 1804.6 ft)
Multi-mode 50 500 2m - 550m (6.6 ft - 1804.6 ft)
Single-mode 9 - 2m - 10,000m (6.6 ft - 32, 810 ft)
1000BASE-LH70
Single-mode 9 core - 2m - 70 km (6.6 ft - 43 miles)