Introduction; Installing A Fiber Optic Expansion Module - Linksys EF4124 User Manual

Appendix A: Fiber Optic Modules
(models EF3116 & EF3124 ONLY)
Important: Fiber Optic Modules will only function with model
numbers: EF3116 and EF3124. If you are not sure of the Switch's
model number, make sure there is a fiber optic module port in the
front of the Switch. If it does not have a fiber optic module port, your
Switch will not function with Fiber Optic Modules.

Introduction

Some Ethernet Switches are equipped with an expansion port for adding
optional fiber optic expansion modules.
The 100BaseFX Fiber Modules allow you to connect the Ethernet Switch to
other switches, hubs, or routers in fiber optic network backbones. These mod-
ules use high-bandwidth, multimode fiber optic cabling with SC or ST type
connectors.
Fiber cabling can transmit your Switch's data up to 2000 meters (6560 feet) away
to another switch without requiring signal regeneration. The 100BaseFX SC
Fiber Module (model number EF31SC) and the 100BaseFX ST Fiber Module
(model number EF31ST) are both available through your Linksys dealer.

Installing a Fiber Optic Expansion Module

To install a fiber module into the Ethernet Switch's expansion port, follow
these instructions:
1. Before installing the fiber optic module, you must first power off the
Switch by removing the AC power cord. If the Switch is rack mounted, you
should remove the Switch from the rack temporarily until the fiber optic
module is installed.
2. Remove the faceplate from the unit by loosening the screws on either side
with a screwdriver. Remove the expansion module from its packaging.
Keep the screws for securing the fiber module to the Switch in step 4.
3. Slide your fiber expansion module into the Switch. The module should fit
snugly into the Switch's expansion port.
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Instant EtherFast Series
®
EtherFast 16-Port and 24-Port 10/100 Ethernet Switches
®
4. Secure the fiber module with the screws from the faceplate. You may now
remount the Switch into its rack if needed, then reconnect the AC power cable
to power on the Switch and resume normal operation.
5. Install your multimode fiber optic cabling from the module.
The two fiber optic modules designed for the Ethernet Switches' expansion port are
listed below. The only difference between the two modules are their connector types,
which are SC or ST-type.
100BaseFX SC Fiber Module
100BaseFX ST Fiber Module
Use the guidelines below to plan the layout of your network with other fiber-
equipped devices from your Switch's 100BaseFX fiber module.
100BaseFX Fiber Cabling Distance Limitations
To
Duplex
From
The Ethernet
Switch or
Switch Distance
Extender
Fiber Half only*
Transceive r
* A distance extender has an internal switch, whereas a transceiver does not.
Switches generally use distance extenders, and hubs utilize both types of modules.
N N o o t t e e : : The Switch's fiber module
will not run with Gigabit devices.
To simplify cabling and prevent cabling problems, you should only use one
type of connector throughout all of your fiber cabling, that is, either SC or ST.
Otherwise, you must attach a connector converter or a cable converter to the
fiber module in order to accommodate your connector type. For example, if
your fiber module has a SC connector and your cabling has a ST connector,
then you must attach an SC to ST converter to your fiber module, or vice versa.
EF31SC
EF31ST
Maximum Distance
Full 2000 meters (6560 feet)
Half
412 meters (1350 feet)
208 meters (682 feet)
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