3Com SuperStack 4900 Series User Manual

®
SuperStack 3 Switch 4900 Series 1000BASE-LX Module (3C17712)
User Guide
DUA1771-2AAA01
I
NTRODUCTION
The 1000BASE-LX Module (3C17712) provides your
®
SuperStack 3 Switch 4900 series with four Gigabit
Ethernet fiber optic ports, each operating at full wire
speed and set to full duplex. This allows you to provide
connectivity between the Switch and remote workgroups
or to create a high capacity aggregated link backbone
connection.
The module requires management software version 1.2
or later to be installed on the Switch. For instructions on
upgrading management software, refer to the
documentation supplied with your Switch.
The Module conforms to the full duplex implementation
of the Gigabit Ethernet standard, IEEE 802.3z. Each port
provides a 1000 Mbps connections to another
1000BASE-LX device. Each port uses 62.5 µm or 50 µm
multimode or 8-10 µm single mode fiber optic cable
with MT-RJ duplex connectors and supports the segment
lengths specified in IEEE 802.3z, as shown below:
Fiber Size Fiber Bandwidth
at 1300 nm
62.5 µm
500 MHz*km
50 µm
400 MHz*km
500 MHz*km
8-10 µm
N/A
1
Segment Lengths Supported
2–550 m (7–1805 ft)
2–550 m (7–1805 ft)
2–550 m (7–1805 ft)
IEEE minimum:
2 m–5 km (7-16405 ft)
3Com qualification:
2 m–10 km (7-32810 ft)