OPTICAL SYSTEMS DESIGN
DOC ID: 10100306
OSD151 OPERATOR MANUAL
PAGE 3 OF 12
1.
TECHNICAL SUMMARY
1.1
BRIEF DESCRIPTION
1.1.1
OVERVIEW
The OSD151 is a small high performance fiber optic modem capable of linking equipment employing
RS422 communications over two kilometres of commonly available fiber optic cable.
A pair of OSD151 short haul RS422 modems and a duplex fiber optic cable form a link that is a direct
replacement for twisted pair extension cables. This link provides an effective way of extending cables
from building to building while providing EMI/RFI protection, data security, reduced data error rates,
and elimination of ground loops.
The OSD151 supports full duplex synchronous data rates of between 1kbps and 2.5Mbps. The OSD151
can also operate asynchronously (ie data only, no clock) from DC to 200kbps. A user accessible toggle
switch selects asynchronous or synchronous mode. In either case, no controls are transmitted through
the link.
The OSD151 is also available for singlemode fiber. This version is designated the OSD151L and
operates at a wavelength of 1300nm.
1.1.2
APPLICATIONS
Long distance synchronous RS422 links.
Secure communications.
Hazardous environment.
Factory automation.
1.1.3
FEATURES AND BENEFITS
TTL or RS422 operation.
Extends link lengths to 3km.
Small size, low cost, robust and reliable.
Full duplex, asynchronous operation from
DC to 200kbps or synchronous operation
to 2.5Mbps.
EMI/RFI resistant metal enclosure.
More secure than copper cables.
Power provided via a D connector or by
an external source.
Complete end to end isolation.
