OPTICAL SYSTEMS DESIGN
DOC ID: 10100110
OSD136 OPERATOR MANUAL
Page 4 of 16
1.
TECHNICAL SUMMARY
1.1
BRIEF DESCRIPTION
1.1.1
OVERVIEW
The OSD136 is a small, self contained modem which can provide full duplex synchronous or
asynchronous RS232 communications over duplex optical fiber cable. It incorporates a single chip
multiplexer which handles clock and data signals and two handshake lines, all operating at a rate of up
to 20kbps. In synchronous mode the OSD136 operates with an external clock.
The unit may be used as an asynchronous modem for data rates between DC and 20kbps. It operates
with all commonly available multimode fibers over distances of up to at least 5km.
Applications include any RS232 communications link which requires synchronous operation and/or
handshake signals where distance, electrical noise and/or security considerations render conventional
twisted pair RS232 links impractical.
While normally used as an RS232 modem the OSD136 can also be employed as a four channel
multiplexer, with all channels operating from DC to 20kbps.
The OSD136 is optionally available to operate over singlemode fiber. This model is designated the
OSD136L.
1.1.2
APPLICATIONS
Secure communications.
Links requiring transfer of control lines.
Hazardous environments.
Long distance synchronous or
asynchronous RS232 links.
Terminal cluster to computer.
1.1.3
FEATURES AND BENEFITS
Full Duplex synchronous or asynchronous
data transmission at up to 20kbps.
May be used as a 4 channel RS232
multiplexer.
Safe transmission in hazardous
environments.
More secure than copper cables.
Small EMI/RFI resistant metal enclosure
that plugs onto the back of a computer or
terminal.
Small size, low cost, robust and reliable.
No user adjustments required.
