Model FMC-ST RS stock no. 288-5847
Model FMC-SC RS stock no. 288-5853
Issued March 1998 10774
Fast Ethernet
Media Converters
Instruction Leaflet
Table of contents
1.0 Introduction ____________________________________________________1
1.1 Inspecting the package and product ________________________________________1
1.2 Product description ______________________________________________________1
1.3 Features and benefits ____________________________________________________2
1.4 Applications ____________________________________________________________2
2.0 Installation ____________________________________________________3
2.1 Locating the media converter unit __________________________________________3
2.2 Calculating segment distance ______________________________________________3
2.2.1 Segment distance, full-duplex ______________________________________3
2.2.2 Segment distance, half-duplex ____________________________________4
2.3 Connecting fast ethernet media ____________________________________________6
2.3.1 Connecting twisted pair (RJ-45) ____________________________________6
2.3.2 Connecting fibre optic (SC and ST) ________________________________6
3.0 Operation ______________________________________________________7
3.1 Power requirements, power supply types ____________________________________7
3.2 Front panel LEDs ________________________________________________________7
3.3 Up-link switch on TX port__________________________________________________7
4.0 Troubleshooting ________________________________________________7
5.0 Technical specification __________________________________________7
1.0 Introduction
This section describes the RS Fast Ethernet Media Converters, including features and possible
applications.
1.1 Inspecting the package and the product
Inspect the contents of the package for any signs of damage and ensure that the items listed
below are included.
This package should contain:
1 RS Media Converter Unit
1 External Power Supply, 230Vac 50Hz
1 Set of two metal mounting clips with screws
1 Velcro® tape section, approximately 3 inches in length
1 User guide
1.2 Product description
RS Fast Ethernet Media Converters offer a compact, cost-effective way to convert and transmit data
among twisted pair, and fibre network cabling environments. They allow the use of fibre media with
full-duplex devices such as Fast Ethernet switching hubs, and may sometimes be used with shared
(half-duplex) fast ethernet segments as well.
10774
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Alternatively, a server with full-duplex NIC needs to be connected via a fibre to a 100Mbps
switching hub with RJ-45 ports. In these and similar situations,the RS Fast Ethernet Media Converters
conveniently converts the twisted pair cable to fibre, allowing use of any available RJ-45 Fast
Ethernet switched port with a new or existing fibre cable.
Where shared Fast Ethernet segments are used, such as with Fast Ethernet hubs with RJ-45 ports, it
may be desirable to connect one or more servers or users via fibre cable. It is necessary to calculate
the PDV of overall collision domain for proper operation when the Media Converter is used in
shared half-duplex applications.
2.0 Installation
This section describes the installation of the Media Converters, including location, segment
distance calculation and media connection.
2.1 Locating the Media Converter unit
The compact and lightweight design of the Media Converter allows it to be easily installed in
most location. A velcro strip and a set of two metal clips and screws are included for
mounting the unit on a vertical surface such as a wall or cabinet, or for securing the unit on a
table-top or shelf. Installation location is dependent upon physical layout of the Ethernet
network. Make sure the unit is installed in a location that will be easily accessible to an AC
power outlet and where convection cooling is not inhibited.
Note: Special consideration must be given to maximum segment lengths on each side of the
Media Converter. It is recommended that IEEE 802.3 specification for overall maximum
segment distances be adhered to in order to maintain optimum network performance.
2.2 Calculating segment distances
The media distance considerations are quite different for full-duplex and for half-duplex (standard
Fast Ethernet) installations.
2.2.1 Segment distance, full-duplex
Full-duplex ports, as found in switching hubs and some NICs, can receive and transmit signals
simultaneously and do not experience collisions accordingly.
There may be only two nodes present on a full-duplex segment. Media distance rules are not the
same as for standard (half-duplex) Fast Ethernet because collision distance limitations are not a
factor. Specially, fibre segments can be up to 2Km for multi-mode and up to 15Km for single mode.
100 Mbps
LINK PWR LINK
100 Mbps
LINK PWR LINK
100 Mbps
LINK PWR LINK
10BASE-TX
wiring segment
100BASE-TX
wiring segment
100BASE-FX
wiring segment
Two fast Ethernet media converters provide connectivity for switched 100Mbps hubs via fibre
Fast Ethernet media converters provides connectivity to servers or users via fibre
100BASE-FX
wiring segment
100BASE-TX
wiring segment
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