Handling the Module
The Module can be easily damaged by electrostatic
discharge. To prevent damage, observe the following:
Always wear an anti-static wristband connected to a
suitable earth point.
Do not remove the Module from its packaging until
you are ready to install it into a Switch.
Do not touch any of the pins, connections or
components on the Module.
Handle the Module only by its edges and front panel.
Always store or transport the Module in anti-static
packaging.
Installing the Module into a Switch
CAUTION:
This Module is not hot-insertable or
hot-swappable. Always make sure that the Switch is
powered down and disconnected from the mains before
installing or removing a Module. Use the following
instructions when installing or removing a Module.
CAUTION:
This Module is only designed to work with
the 3Com SuperStack 3 Switch 4900 Family and the
3Com Switch 40x0 Family.
To install the Module:
1
Ensure that the Switch is disconnected from the mains
power supply and RPS connector (if applicable) and that
you are wearing an anti-static wristband connected to a
suitable earth point.
2
Undo the three screws securing the blanking plate at the
rear of the Switch using a suitable screwdriver. Do not
remove any other screws from the rear of the Switch.
3
Remove the blanking plate.
4
Keep the blanking plate and screws in a safe place. If
you remove the Module at any time, you must replace
the blanking plate to prevent dust and debris entering
the Switch and to help the circulation of cooling air.
5
Hold the Module so that the text on the front panel is
upright. Insert it into the Switch, pushing firmly to
ensure the Module is seated correctly so that the
backpanel is flush with the back of the Switch. Tighten
the three captive thumbscrews securing the Module with
a suitable tool.
Activating the Module
1
Ensure that the Switch is powered-up.
2
Insert one of the following transceivers into a GBIC
expansion port on the Module:
1000BASE-SX GBIC transceiver
Use this transceiver to connect the Module directly to
multimode fiber-optic cable.
1000BASE-LX GBIC transceiver
Use this transceiver to connect the Module directly to
a single-mode fiber-optic cable or to multimode fiber
using a conditioned launch cable.
1000BASE-LH70 GBIC transceiver
Use this transceiver to connect the Module directly to
a single-mode fiber-optic cable or to multimode fiber
using a conditioned launch cable.
To ensure optimal performance, compatibility, and
regulatory compliance, use only GBIC transceivers that
3Com supports. See “Approved GBIC Transceivers” on
page 4.
a
Hold the transceiver so that the fiber-optic duplex
subscriber connector (SC) is toward you.
b
Gently slide the transceiver into the GBIC port until it
clicks into place.
CAUTION:
GBIC transceivers are keyed and can be
properly inserted only one way. If the transceiver does
not click when you insert it, remove it, turn it over, and
reinsert it.
GBIC transceivers are hot-insertable and hot-swappable.
You can remove them from and insert them into any
port on the Module without having to power down the
Switch.
3
The transceiver connects to the network using the
duplex SC connector. Attach the male duplex SC
connector on the network cable into the duplex SC
connector on the transceiver.
4
Connect the other end of the fiber-optic cable to a
device fitted with an appropriate Gigabit Ethernet
connection.
5
Check the LEDs on the front of the Switch and the rear
of the Module to ensure that the Module is operating
correctly. Refer to “LEDs” on page 1 for more
information.
Removing a Transceiver from the Module
To replace an existing GBIC transceiver, compress the
side tabs and gently pull the transceiver out of the port.
GBIC transceivers are hot-insertable and hot-swappable.
You can remove them from and insert them into any
port on the Module without having to power down the
Switch.
Removing the Module from a Switch
1
Ensure that the power supply and the backbone
connection cables are disconnected from the Switch.
2
Undo the three captive thumbscrews securing the
Module into the Switch using a suitable tool. Do not
remove any other screws from the Switch.
3
Remove the Module.
4
If you are not fitting another Module immediately,
replace the blanking plate to ensure that dust and debris
do not enter the Switch and to help the circulation of
cooling air.
I
NSTALLATION
A
ND
R
EMOVAL
!
!
!
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