Application Diagrams
DTE Device (PC) To DCE Device (Modem)
This Fiber Optic System is always used in a pair. One of the media converters must always be set to DTE mode via
the dip switch and the other media converter must be set to DCE for proper operation. When connecting DCE and
DTE end devices over fiber, pair the DCE end device with the media converter set to DTE mode, and pair the DTE
end device with the media converter set to DCE mode. Then make the interconnections between each of the
media converters and the end devices with a straight through serial cable as illustrated below.
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Typical Application Diagram
DCE Device To DCE Device
This Fiber Optic System is always used in a pair. One of the media converters must always be set to DTE mode via
the dip switch and the other media converter must be set to DCE for proper operation. When connecting two DCE
end devices over fiber, where the DCE end device connects to the media converter set to DTE mode, use a straight
through serial cable. Where the other DCE end device connects to the media converter in DCE mode use a null
(crossover) serial cable. Below is an example of a system where both end devices are DCE devices and connected
with the appropriate straight through and null (crossover) cables.
"
(DCE to DCE / DTE to DTE)
Same Device Type Application Diagram
FIBER LINK
RS-232
SERIAL
DATA
FIBER LINK
RS-232
SERIAL
DATA
RLH Industries, Inc.
RS-232
TX
RX
POWER
RX
FIBER
TX
N/A
N/A
DTE
DCE
FIBER
FIBER LINK
RS-232
SERIAL
DA T
A
FIBER LINK
RS-232
SERIAL
DA T
A
RLH Industr
ies, Inc.
RS-232
TX
RX
POWER
RX
FIBER
TX
N/A
N/A
DTE
DCE
FIBER
Up to
74 mi./120km
Fiber Optic
Cable
FIBER LINK
RS-232
SERIAL
DATA
FIBER LINK
RS-232
SERIAL
DATA
RLH Industries, Inc.
RS-232
TX
RX
POWER
RX
FIBER
TX
N/A
N/A
DTE
DCE
FIBER
DTE Device
(Computer)
DCE Device
(Modem)
DTE Switch Detail
DCE Switch Detail
FIBER LINK
RS-232
SERIAL
DATA
FIBER LINK
RS-232
SERIAL
DATA
RLH Industries, Inc.
RS-232
TX
RX
POWER
RX
FIBER
TX
N/A
N/A
DTE
DCE
FIBER
DB-9
Serial Cable
Straight
Thru
RS-232
Media Converter
RS-232
Media Converter
DB-9
Serial Cable
Straight
Thru
FIBER LINK
RS-232
SERIAL
DATA
FIBER LINK
RS-232
SERIAL
DATA
RLH Industries, Inc.
RS-232
TX
RX
POWER
RX
FIBER
TX
N/A
N/A
DTE
DCE
FIBER
FIBER LINK
RS-232
SERIAL
DA T
A
FIBER LINK
RS-232
SERIAL
DA T
A
RLH Industr
ies, Inc.
RS-232
TX
RX
POWER
RX
FIBER
TX
N/A
N/A
DTE
DCE
FIBER
DCE Device
(Modem)
DCE Device
(Modem)
FIBER LINK
RS-232
SERIAL
DATA
FIBER LINK
RS-232
SERIAL
DATA
RLH Industries, Inc.
RS-232
TX
RX
POWER
RX
FIBER
TX
N/A
N/A
DTE
DCE
FIBER
FIBER LINK
RS-232
SERIAL
DA T
A
FIBER LINK
RS-232
SERIAL
DA T
A
RLH Industr
ies, Inc.
RS-232
TX
RX
POWER
RX
FIBER
TX
N/A
N/A
DTE
DCE
FIBER
FIBER LINK
RS-232
SERIAL
DATA
FIBER LINK
RS-232
SERIAL
DATA
RLH Industries, Inc.
RS-232
TX
RX
POWER
RX
FIBER
TX
N/A
N/A
DTE
DCE
FIBER
FIBER LINK
RS-232
SERIAL
DA T
A
FIBER LINK
RS-232
SERIAL
DA T
A
RLH Industr
ies, Inc.
RS-232
TX
RX
POWER
RX
FIBER
TX
N/A
N/A
DTE
DCE
FIBER
Up to
74 mi./120km
Fiber Optic
Cable
DB-9
Serial Cable
Null / Crossover
FIBER LINK
RS-232
SERIAL
DATA
FIBER LINK
RS-232
SERIAL
DATA
RLH Industries, Inc.
RS-232
TX
RX
POWER
RX
FIBER
TX
N/A
N/A
DTE
DCE
FIBER
DCE Switch Detail
DTE Switch Detail
FIBER LINK
RS-232
SERIAL
DATA
FIBER LINK
RS-232
SERIAL
DATA
RLH Industries, Inc.
RS-232
TX
RX
POWER
RX
FIBER
TX
N/A
N/A
DTE
DCE
FIBER
DB-9
Serial Cable
Straight Thru
RS-232
Media Converter
RS-232
Media Converter
RLH Industries, Inc. • Tel. 866-DO-FIBER • Fax 714 532-1885 • www.fiberopticlink.com
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