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24 C
HAPTER
3: C
ABLING
C
ORE
B
UILDER
9400 P
ORTS
Figure 8
Cabling the GBIC Transceiver
6
Attach the other end of the network fiber-optic cable
to the network device that you want to connect.
7
Repeat steps 1 through 6 for additional GBIC ports.
Connecting the LX Transceiver to MMF
The LX transceiver supports a connection to
multimode fiber using a conditioned launch cable.
The conditioned launch cable consists of an offset
mechanism on the transmit side of the cable that
aligns the single-mode laser launch away from the
center of the multimode fiber core, creating a
transmission signal similar to typical multimode
light-emitting-diode (LED) launches. This offset allows
the transmission of LX signals over multimode fiber
cable.
You need a conditioned launch cable to complete the
following procedure. To ensure optimal compatibility,
performance, and regulatory compliance, use only
conditioned launch cables that 3Com supports. For a
list of currently supported launch cables, visit this
3Com Web site:
http://www.3Com.com/gigabit_ethernet/gbics
To cable a GBIC port to multimode fiber using an LX
transceiver:
1
Read and follow the “Fiber Safety Precautions” on
page 19 and the Caution at the beginning of
“Cabling Gigabit Ethernet Ports” earlier in this
chapter.
2
Insert a GBIC LX transceiver into a GBIC port until it
clicks into place, as shown in Figure 6.
3
If you haven’t already done so, remove the SC
connector cover from the transceiver, as shown in
Figure 7.
CONSOLE
0BASE TX
TUS PACKET
S TAT
PCKT
S TAT
PCKT
POWER
FAULT
1000BASE (GBIC)
1000BASE (GBIC)
14 15 16 17 18
20 21 22 23 24
STATUS
green = enabled, link OK
flashing green = disabled, link OK
off = link fail
GBIC
transceiver
Duplex
SC connector
Fiber optic
network cable