Optical Systems Design OSD151 User manual

OPTICAL SYSTEMS DESIGN
DOC ID: 10100306
OSD151 OPERATOR MANUAL
PAGE 1 OF 12
OSD151
SYNCHRONOUS/ASYNCHRONOUS FIBER
OPTIC RS422/TTL MODEM

OPTICAL SYSTEMS DESIGN
DOC ID: 10100306
OSD151 OPERATOR MANUAL
PAGE 2 OF 12
INDEX
1. TECHNICAL SUMMARY............................................................................................................ 3
1.1 BRIEF DESCRIPTION ............................................................................................................3
1.1.1 OVERVIEW ...................................................................................................................... 3
1.1.2 APPLICATIONS ............................................................................................................... 3
1.1.3 FEATURES AND BENEFITS ........................................................................................... 3
1.2 TYPICAL CONFIGURATION................................................................................................4
1.3 PRODUCTS AND OPTIONS .................................................................................................. 4
1.4 TECHNICAL SPECIFICATION.............................................................................................. 5
1.5 PIN ASSIGNMENTS ............................................................................................................... 6
2. INSTALLATION AND OPERATION .........................................................................................7
2.1 INTRODUCTION .................................................................................................................... 7
2.2 INSTALLATION .....................................................................................................................7
2.2.1 WARNING AND PRECAUTIONS .................................................................................... 7
2.2.2 PACKAGING.................................................................................................................... 8
2.2.3 POWER SUPPLY CONNECTIONS.................................................................................. 8
2.2.4 OTHER CONNECTIONS.................................................................................................. 9
2.3 OPERATION..........................................................................................................................10
2.3.1 BLOCK DIAGRAM......................................................................................................... 10
2.3.2 CONTROLS .................................................................................................................... 10
3. MAINTENANCE..........................................................................................................................11
3.1 INTRODUCTION .................................................................................................................. 11
3.2 EXTERNAL INSPECTION ................................................................................................... 11
3.3 ROUTINE MAINTENANCE.................................................................................................11
4. WARRANTY ................................................................................................................................12
4.1 WARRANTY PERIOD .......................................................................................................... 12
4.2 ALL REPAIRS .......................................................................................................................12
4.2.1 WARRANTY REPAIRS.................................................................................................... 12
4.2.2 OUT-OF-WARRANTY REPAIRS.................................................................................... 12
4.2.3 SITE REPAIRS................................................................................................................ 12
4.3 EXCLUSIONS .......................................................................................................................12
FIGURE 1: TYPICAL CONFIGURATION ............................................................................................ 4
FIGURE 2: D CONNECTOR PINOUT CONFIGURATION ................................................................. 6
FIGURE 3: DIMENSIONS ...................................................................................................................... 8
FIGURE 4: POWER SOCKET CONNECTION DIAGRAM.................................................................. 8
FIGURE 5: TIMING DIAGRAM ............................................................................................................ 9
FIGURE 6: BLOCK DIAGRAM ........................................................................................................... 10
TABLE 1: PRODUCTS AND OPTIONS ................................................................................................ 4
TABLE 2: TECHNICAL SPECIFICATIONS ......................................................................................... 5
TABLE 3: PIN ASSIGNMENTS............................................................................................................. 6

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.

OPTICAL SYSTEMS DESIGN
DOC ID: 10100306
OSD151 OPERATOR MANUAL
PAGE 4 OF 12
1.2 TYPICAL CONFIGURATION
Below in FIGURE 1 is a typical set-up for two OSD151’s that may be used together.
FIGURE 1: TYPICAL CONFIGURATION
It should be noted that the unit can operate in either synchronous or asynchronous mode and that the
mode is user selected via a switch on the OSD151.
1.3 PRODUCTS AND OPTIONS
There are various options available for the OSD151. These options are identified in TABLE 1 below:
TABLE 1: PRODUCTS AND OPTIONS
ITEM DESCRIPTION
OSD151 SYNCHRONOUS/ASYNCHRONOUS RS422/TTL MODEM
OPTION L SINGLEMODE OPTION FOR THE ABOVE
OSD151PP PLUG PACK FOR THE OSD151
OSD151
Tx
Rx
OSD151
Rx
Tx
Data
Ch1
Data
Ch1
Fiber Optic Cable
Data
Ch2
Data
Ch2

OPTICAL SYSTEMS DESIGN
DOC ID: 10100306
OSD151 OPERATOR MANUAL
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1.4 TECHNICAL SPECIFICATION
TABLE 2 below lists the Technical Specifications for the OSD151.
TABLE 2: TECHNICAL SPECIFICATIONS
SPECIFICATION PERFORMANCE
Data rate DC to 200kbps in asynchronous mode
1kbps to 2.5Mbps in synchronous mode
Pulse Distortion and Jitter < ± 100ns over the full dynamic range for synchronous transmission
< ± 500ns over the full dynamic range for asynchronous transmission
Input RS422 Levels
Output RS422 Levels
Controls Synchronous/Asynchronous selection
Optical Wavelength 850nm nominal (1310nm for OSD151L)
Optical Transmit Power
> –18 to 16dBm into 62.5/125multimode fiber
> –20 to -16dBm into singlemode fiber (OSD151L only)
Receiver Sensitivity
(for a BER of 1 x 10
–9
) >– 35dBm
Optical Loss Budget > 17dB at 850nm (>5km of multimode fiber)
> 15dB at 1310nm (>25km of singlemode fiber)
Receiver Saturation >- 16dBm
Electrical Connector 25 Pin D connector (female) for power and data
Optical Connector ST
Power Connector 1.3mm socket on side of case
Operating Temperature -20 to + 75°C
Relative Humidity 0 to 95% non-condensing
Power 8V to 14V DC at less than 200mA via D connector or power socket
Weight 120g
Dimensions(mm) 15H X 54W X 93D
10215103

OPTICAL SYSTEMS DESIGN
DOC ID: 10100306
OSD151 OPERATOR MANUAL
PAGE 6 OF 12
1.5 PIN ASSIGNMENTS
TABLE 3 identifies the pin assignments of the 25 Pin D Connector on the OSD151.
TABLE 3: PIN ASSIGNMENTS
PIN NAME FUNCTION
1 Protective ground pin Connected to case.
2 Transmit data + Modem accepts data.
3 Transmit data - Modem accepts data.
4 Receive data + Modem outputs data.
5 Receive data - Modem outputs data.
6 Not used
7 Signal ground 0V ground.
8 Not used
9 Power +12V DC Power input.
10 Transmit clock - Modem accepts clock.
11 Transmit clock + Modem accepts clock.
12 Receive clock + Modem outputs clock.
13 Receive clock - Modem outputs clock.
FIGURE 2: D CONNECTOR PINOUT CONFIGURATION
1
13
1425

OPTICAL SYSTEMS DESIGN
DOC ID: 10100306
OSD151 OPERATOR MANUAL
PAGE 7 OF 12
2. INSTALLATION AND OPERATION
2.1 INTRODUCTION
This section outlines the methods required to install and operate the OSD151 successfully. This
information should be studied carefully if damage to the equipment or poor results are to be avoided.
This equipment has been fully tested prior to dispatch and is ready for immediate operation. However,
it is advisable to check for external transportation damage prior to operation. If damage is detectable,
return the unit and the packaging to the supplier.
2.2 INSTALLATION
2.2.1 WARNING AND PRECAUTIONS
ELECTROMAGNETIC COMPATIBILITY
WARNING: This is a Class A product. In a domestic environment this product may cause radio
interference in which case the user may be required to take adequate measures.
OPTICAL OUTPUT OPERATION
WARNING: Laser Safety: Class 1 Laser Product per IEC 60825-1:2014 standard.
Class 1
The OSD151 is a Class 1 laser product.
▲ All service personnel should be provided training as to the hazards of direct viewing of laser
radiation and of the precautionary measures during servicing of equipment
▲ Areas where laser products are installed should be restricted in access to trained service
personnel only and appropriate warning signs posted in the work area.
▲ All laser apertures should be covered by protective covers when not connected to optical
fibers. Never leave outputs uncovered.
▲ Laser equipment should be positioned above or below eye level where possible. Apertures
should be positioned away from personnel.
▲ Protective eyewear should be worn in the vicinity of laser equipment.

OPTICAL SYSTEMS DESIGN
DOC ID: 10100306
OSD151 OPERATOR MANUAL
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2.2.2 PACKAGING
The case of the OSD151 is made from metal, and is designed to be placed on a bench or to be mounted
directly on the host equipment’s 25 Pin D Connector. FIGURE 3 below, provides the outside
dimensions of the OSD151.
FIGURE 3: DIMENSIONS
2.2.3 POWER SUPPLY CONNECTIONS
The OSD151 is powered by +8 to 14V
DC
which may be supplied to the unit via Pin 9 of the 25 Pin D
connector or via the included 1.3mm power socket mounted on the side of the unit. The internal pin is
the positive connection and the outer connection is Ground (see Figure 4).
FIGURE 4: POWER SOCKET CONNECTION DIAGRAM
44
55
15
80
13
All Dimensions
are in mm
Gnd +VGnd +V
Gnd +V

OPTICAL SYSTEMS DESIGN
DOC ID: 10100306
OSD151 OPERATOR MANUAL
PAGE 9 OF 12
2.2.4 OTHER CONNECTIONS
The RS422 signal is connected to or from external equipment by the 25 pin D connector. Ensure that
the incoming clock and data signals are correctly phased. The clock should go logically low at the
halfway point of the data bit.
Likewise ensure that the receiving equipment can accept the phasing of the clock and data signals
output from the OSD151 which has the clock going logically high about 15ns to 20ns before the data
bit. Refer to Figure 5 for more details.
+12V DC power is fed to the unit via pin 9 of this connector or via the power socket.
Each optical fiber must be terminated by an ST type optical connector. Before connection, inspect the
end of the connectors to ensure that no dust or dirt is present as it could contaminate the modem
connector and result in poor performance.
If it is necessary to clean the cable connectors use isopropyl alcohol and a lint free tissue to remove
contamination.
FIGURE 5: TIMING DIAGRAM
CLOCK
INPUT
DATA
INPUT
CLOCK
OUTPUT
DATA
OUTPUT
MUST BE
<50nS
TYPICALLY
15nS TO 20nS

OPTICAL SYSTEMS DESIGN
DOC ID: 10100306
OSD151 OPERATOR MANUAL
PAGE 10 OF 12
2.3 OPERATION
2.3.1 BLOCK DIAGRAM
Below in Figure 6 is a simple block diagram of the OSD151.
FIGURE 6: BLOCK DIAGRAM
2.3.2 CONTROLS
The OSD151 has just one control: a toggle switch located between the optical connectors which selects
either synchronous or asynchronous operation.
D CONNECTOR
ENCODER
POWER
REGULATION
Tx Data
Rx Data
Tx Clk
Rx Clk
Tx Data
Rx Data
2MHz OSC
Tx Clk
Rx Clk
Sync/Async Sw
Optical Output
Optical Input
Driver
AMP
Ext Power
DECODER
RS422/TTL
CONVERTER

OPTICAL SYSTEMS DESIGN
DOC ID: 10100306
OSD151 OPERATOR MANUAL
PAGE 11 OF 12
3. MAINTENANCE
3.1 INTRODUCTION
The following section outlines the fault-finding procedure for the OSD151 modem. Please take note of
the following:
Personnel without appropriate training should not attempt any maintenance except that outlined
below.
If further maintenance is attempted you are warned that every care should be taken to ensure that
internal measurements made while the equipment is operational are taken carefully as some
components within the unit are expensive and may be damaged by failure of any portion of their
support circuitry.
Some components within the unit are electrostatic sensitive and ESD precautions should be taken
when performing maintenance upon the unit.
3.2 EXTERNAL INSPECTION
Visually check for the following:
Ensure that the correct power source (ie +12V DC) is connected to pin 9 of the D connector or to
the power socket.
Ensure that the RS422 signal is connected to the modem correctly and that the distant OSD151
modem has been terminated correctly to any external equipment.
Inspect the optical connectors for any contamination and clean using isopropyl alcohol and a lint
free tissue if any contamination is detected.
Ensure that the toggle switch is set for the correct mode of operation.
If synchronous operation is selected check that the system is generating correctly phased clock
signals and that it accepts the phasing of received clock signals with respect to the received data
signal. Refer to FIGURE 5 for the correct phasing.
Check that any external termination resistors are connected if the system configuration requires
them in.
3.3 ROUTINE MAINTENANCE
There is no routine maintenance required with the OSD151.

OPTICAL SYSTEMS DESIGN
DOC ID: 10100306
OSD151 OPERATOR MANUAL
PAGE 12 OF 12
4. WARRANTY
Thank you for purchasing equipment designed, manufactured and serviced by Optical Systems Design
(OSD). OSD warrants that at the time of shipment, its products are free from defects in material and
workmanship and conforms to specifications. Our Warranty conditions are outlined below:
4.1 WARRANTY PERIOD
For warranty period, please call your local OSD distributor.
4.2 ALL REPAIRS
Optical Systems Design reserves the right to repair or replace faulty modules/units. Please obtain a
“Return Material Authorisation” number form and number before returning goods.
Goods must be returned to Optical Systems Design, Warriewood or its nominated authorised
representative, for all repairs in adequate packing material.
4.2.1 WARRANTY REPAIRS
Return shipments to OSD shall be at customer's expense and freight back to the customer will be at
OSD expense.
4.2.2 OUT-OF-WARRANTY REPAIRS
OSD reserves the right to repair or replace any faulty goods. Freight costs and insurance for both
journeys are met by the user. All equipment repaired by OSD will have a 3 Month Warranty from the
date of dispatch.
4.2.3 SITE REPAIRS
By agreement site repairs may be undertaken for which out of pocket, hotel and travel expenses will be
charged.
4.3 EXCLUSIONS
This warranty does not apply to defects caused by unauthorised modifications, misuse, abuse or
transport damage to the equipment. All modifications to OSD’s standard product will need written
authorisation and will be charged at normal repair rates. All modifications are to be carried out by OSD
Technicians. Warranty will lapse if unauthorised removal and/or tampering with serial number and/or
repair labels occurs.