Optical Systems Design OSD138, Operator'S Manual, Page: 4 / 20

OPTICAL SYSTEMS DESIGN
DOC ID: 10105510
OSD138 OPERATOR MANUAL
PAGE 2
1 TECHNICAL SUMMARY
1.1 PRODUCT DESCRIPTION
1.1.1
OVERVIEW
The OSD138 is a high performance universal fiber optic modem capable of transmitting and receiving
RS422, RS232 or RS485 full duplex, asynchronous data over distances of several kilometres at the
speeds from DC to 1Mbps. The 6-way switch is used to configure the Data Mode and RS485
turnaround times.
The OSD138 is available in two physical configurations: card or module. The card versions are
designed to fit the 3RU-high 19” OSD370 chassis (or OSD350 chassis) which allows multiple OSD
card products to be conveniently powered from and located in the one chassis. The module case
versions are intended for isolated use and require an external power source.
The OSD138 operates over up to 5km of standard low cost multimode fiber optic cable and over up to
at least 50km of singlemode fiber.
The OSD138 can be used with any standard multimode optical fiber, and is available optionally for
singlemode fiber use. Wavelength Division Multiplexing (WDM) is available to allow the use of a
single fiber for transmission and reception. For 2-wire RS485 transmission, the OSD138 is also
available with Single Fiber Single Wavelength operation (SFSW) which will interoperate with the
OSD155 RS485 modem.
1.1.2
APPLICATIONS
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Long distance RS422, RS232 or RS485 links
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Links requiring a module at one end and a card at the other
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Secure, noise immune government and industrial communications
1.1.3
FEATURES AND BENEFITS
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Multi-protocol operation
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2 and 4-wire RS485, TTL, RS422, Manchester, Biphase or RS232 operation
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Extends link lengths to 5km on multimode and over 50km on singlemode fiber
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Full duplex, asynchronous, DC to 1Mbps
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Plugs directly into the OSD370 or OSD350 standard chassis (card version)
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ST optical connectors standard
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Safe transmission in hazardous environments
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More secure than copper cables
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Robust and reliable