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Gigabit Ethernet Modules 41
Connecting the LX Transceiver to MMF
The LX transceiver supports a connection to
multimode fiber by means of 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 launches from typical
multimode light-emitting diodes (LEDs). 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 the GBIC module to multimode fiber using
an LX transceiver:
1 Read and follow the “Fiber and Laser Safety
Precautions” on page 35 for safe operation.
2 Insert the GBIC LX transceiver into the GBIC port until
it clicks into place, as shown in Figure 16.
3 If you have not already done so, remove the SC
connector cover from the transceiver, as shown in
Figure 17.
The SC Receive (RX) port is on the
left
, and the SC
Transmit (TX) port is on the
right
, as you face the
system. See Figure 19.
4 Insert the SC connectors on the conditioned launch
cable into the transceiver as shown in Figure 19,
ensuring that you:
■ Insert the SC connector on the
multimode
Receive
(RX) side of the conditioned launch cable into the
RX port on the transceiver.
■ Insert the SC connector on the
single-mode
Transmit (TX) side of the conditioned launch cable
into the TX port on the transceiver.
Think of the conditioned launch cable as an extension
to the multimode network cable.
5 Attach the other end of the conditioned launch cable
to the multimode network cable, verifying that you:
■ Connect the multimode RX side of the conditioned
launch cable to the RX side of the network cable.
■ Connect the multimode TX side of the conditioned
launch cable to the TX side of the network cable.
If necessary, use fiber-optic couplers to connect the
male SC connectors on the multimode end of the
conditioned launch cable to the multimode network
cable.
6 Attach the other end of the network fiber-optic cable
to the network device that you want to connect.