Optical Systems OSD840 SERIES User manual

OPERATOR MANUAL
OSD840 SERIES
DIGITAL VIDEO, ETHERNET, DATA AND
AUDIO
FIBER OPTIC TRANSMISSION SYSTEM

OPTICAL SYSTEMS DESIGN
DOC ID: 10104804.doc
OSD840 OPERATOR MANUAL
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INDEX 1
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..................................................................................................5
1.4 TECHNICAL SPECIFICATIONS...........................................................................................6
1.5 PRODUCT DESCRIPTION.....................................................................................................7
1.6 PIN ASSIGNMENTS...............................................................................................................8
2 INSTALLATION AND OPERATION.....................................................................................9
2.1 INTRODUCTION....................................................................................................................9
2.2 INSTALLATION.....................................................................................................................9
2.2.1 WARNING AND PRECAUTIONS.................................................................................9
2.2.2 PACKAGING.................................................................................................................10
2.2.3 POWER SUPPLY CONNECTIONS .............................................................................11
2.2.4 OTHER CONNECTIONS..............................................................................................11
2.2.5 LINK SETTINGS...........................................................................................................12
2.3 OPERATION .........................................................................................................................13
2.3.1 OSD840T OPERATION................................................................................................13
2.3.2 OSD840R OPERATION................................................................................................14
2.3.3 INTERCOM FUNCTION..............................................................................................15
2.3.4 CONTROLS...................................................................................................................15
2.3.5 ETHERNET CONNECTION.........................................................................................16
2.3.6 OSD840T AND OSD840R INDICATORS....................................................................16
3 MAINTENANCE .....................................................................................................................18
3.1 INTRODUCTION..................................................................................................................18
3.2 EXTERNAL INSPECTION...................................................................................................18
3.3 ROUTINE MAINTENANCE ................................................................................................18
4 WARRANTY............................................................................................................................19
4.1 WARRANTY PERIOD..........................................................................................................19
4.2 REPAIRS................................................................................................................................19
4.2.1 WARRANTY REPAIRS................................................................................................19
4.2.2 OUT-OF-WARRANTY REPAIRS................................................................................19
4.2.3 SITE REPAIRS ..............................................................................................................19
4.2.4 EXCLUSIONS ...............................................................................................................19

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INDEX OF TABLES AND FIGURES
TABLE 1: PRODUCTS AND OPTIONS................................................................................................5
TABLE 2: TECHNICAL SPECIFICATIONS.........................................................................................6
TABLE 3: PIN ASSIGNMENT...............................................................................................................8
TABLE 4: POWER CONNECTION .....................................................................................................11
TABLE 5: OSD840T AND OSD840R LINKS CONFIGURATION....................................................12
TABLE 6: OSD840T/R RS-485 TIMING DELAYS.............................................................................13
TABLE 7: OSD840T AND OSD840R INDICATOR FUNCTION.......................................................17
FIGURE 1: TYPICAL CONFIGURATION............................................................................................4
FIGURE 2: DB26 FEMALE HIGH DENSITY CONNECTOR..............................................................8
FIGURE 3: OSD840 CASE MOUNTING DIMENTIONS...................................................................10
FIGURE 4: OSD840TC AND OSD840RC POWER SUPPLY CONNECTIONS................................11
FIGURE 5: OSD840TC AND OSD840RC SIDE VIEW.......................................................................14
FIGURE 6: RJ11 PINOUT CONFIGURATION...................................................................................15
FIGURE 7: 10/100 BASE-T ETHERNET RJ45 CONNECTION.........................................................16
FIGURE 8: OSD840T AND OSD840R LED INDICATORS...............................................................16

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1TECHNICAL SUMMARY
1.1 BRIEF DESCRIPTION
1.1.1 OVERVIEW
The OSD840T modem consists of an optical transmitter section which transmits a video signal plus
data, two audio and Ethernet signals in digital format as well as an optical receiver section for similar
data, audio and Ethernet signals transmitted to the camera for control and communication purposes.
The OSD840T control signal receiver provides adjustment free operation over the full optical range.
The OSD840R incorporates a high performance optical digital receiver for incoming video, data, two
audio and Ethernet signals and a transmitter, which outputs a digital optical signal consisting of two
audio signals and four data channels. It is designed to be used with the OSD840T. The OSD840R
receiver provides a constant video output level, which is independent of link loss. The audio/data
section of the OSD840R is also adjustment free over all link lengths. Audio and data signal interface
levels and impedance’s are the same as those of the OSD840T.
1.1.2 APPLICATIONS
VHigh quality CCTV networks requiring
full duplex Ethernet, data and/or audio
transmission between cameras and either
control centre
VExtremely high quality video
conferencing
VBroadcast television systems
VTransportation communication system
1.1.3 FEATURES AND BENEFITS
VOne way optic transmission of PAL,
NTSC or SECAM video plus full duplex
transmission of
•One 10/100 Base-T Ethernet channel
•Two audio channels
•Three data channels
•One relay contact channel
VStudio quality 10 bit video and 24 bit
audio
VVideo bandwidth of 10MHz
VRemote control of Pan, Tilt and Zoom for
video surveillance
VTransmission of alarm and control signals
from the camera site
VFull duplex 2-wire audio intercom with
100Hz to 5kHz bandwidth and associated
on hook/off hook signaling with industry
standard RJ11 connector
VOperating range of at least 3km on
multimode fiber, depending on optical
devices
VVideo inputs have 3dB overload
capability and can be equalised for up to
300m of coaxial cable

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1.2 TYPICAL CONFIGURATION
FIGURE 1 below indicates a typical set-up for an OSD840T and OSD840R.
FIGURE 1: TYPICAL CONFIGURATION
POWER
SUPPY POWER SUPPLY
OSD840T OSD840R
DATA CH1-CH3
RELAY CH
VIDEO INPUT
Optical Fiber Link
DATA CH1-CH3
AUDIO CH1-CH2
RELAY CH
WDM version
ONLY
Twin Fiber
version
VIDEO OUTPUT
AUDIO CH1-CH2
ETHERNET ETHERNET

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1.3 PRODUCTS AND OPTIONS
There are various options available for the OSD840 as identified in Table 1 below:
TABLE 1: PRODUCTS AND OPTIONS
ITEM DESCRIPTION
OSD840AT VIDEO TRANSMITTER WITH 1 ETHERNET, 2 DUPLEX AUDIO AND 4*1
DUPLEX DATA CHANNELS
OSD840AR VIDEO RECEIVER WITH 1 ETHERNET, 2 DUPLEX AUDIO AND 4*1
DUPLEX DATA CHANNELS
ITEM DESCRIPTION
OPTION C MODULE VERSION
OPTION L SINGLEMODE OPTION
OPTION LDN 1300nm AND 1550nm LASER (where “N” indicates Laser type)
OPTION W SINGLE FIBER OPERATION
*1 The 4 Data channels consist of 3 Data channels capable of DC to >400kbps, and 1 Relay channel up
to 100bps.

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1.4 TECHNICAL SPECIFICATIONS
TABLE 2: TECHNICAL SPECIFICATIONS
SPECIFICATION PERFORMANCE
Video Input/Output Impedance 75Ωcomposite
Video Input/Output Levels 1Vpp nominal
Video Connectors BNC
Video Bandwidth 5Hz to 10MHz (±1dB)
Signal to Noise Ratio (Weighted) > 67dB at all receive levels over the unit’s full dynamic range
Video Distortion <0.5% Differential Phase (DP), <0.5°Differential Gain (DG)
Audio Input/Output Impedance >10kΩ/200ΩBalanced/Unbalanced
Audio Bandwidth 10Hz - 22kHz ± 1dB
Audio Input & Output Level 0dBu (0.775Vrms) nominal, balanced or unbalanced
Audio Headroom 20dB balanced, 15dB unbalanced
Audio Signal to Noise Ratio >100dB (weighted at max level)
Audio Distortion < 0.02% Total Harmonic Distortion (THD)
Data Interface TTL, RS232, RS422 and RS485
31kHz Manchester or Biphase possible in either direction
Data Rates DC to >400kbps on 3 data channels
DC to >100bps on relay channel
Ethernet IEEE Ethernet standards at 10/100Mbps
Ethernet Connector RJ45
Audio and Data Connectors 26 Pin female high density D connector, RJ11 for 2-wire intercom
Transmitter Wavelength 850nm (1310nm for OSD840TL or OSD840RL options)
OSD840T Transmitter Coupled
Power >-15 to -5dBm into multimode fiber
>-15 to -3dBm into singlemode fiber (OSD840TL only)
OSD840R Transmitter Coupled
Power >-20 to -14dBm into multimode fiber
>-20 to -10dBm into singlemode fiber (OSD840RL only)
OSD840R Receiver Sensitivity <-29dBm
OSD840R Sensitivity >-3dBm
OSD840T Receiver Sensitivity <-37dBm
OSD840T Sensitivity >-10dBm
Link Distances
>2km multimode for standard 850nm OSD840 link (fiber bandwidth limited)
>3km multimode for optional 1310nm OSD840L link (fiber bandwidth limited)
>30km singlemode for optional 1310nm OSD840L link (fiber loss limited)
Optical Connectors ST standard, others optional
Dimensions (mm) 104W x 144D x 44H module
50W x 208D x 100H card
Weight 400g (module), 200g (card)
Power Requirements 12V to 24VDC @ 300mA
Operating Temperature -20 to +75°C
Relative Humidity 0 to 95% non-condensing
Chassis Current Consumption 0.40 Amp
10284007

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1.5 PRODUCT DESCRIPTION
The OSD840 series is a high-quality digital video, Ethernet, audio and data optical fiber transmission
system. The system consists of the OSD840T and the OSD840R, which are designed to be used as a
pair. The system provides one-way transmission of PAL, NTSC or SECAM video, plus full-duplex
transmission of two audio, three data channels, one relay channel and a 10/100 Base-T Ethernet
connection via the RJ45 connector.
The OSD840T accepts one analogue composite video input signal and two analogue audio input signals
along with three digital data input signals, one relay contact signal and a 10/100 Base-T Ethernet
connection. The video signal is converted to digital with 10-bit resolution, while the audio signals are
converted using 24-bit resolution so as to preserve the quality of the input signals. The resulting digital
signals are multiplexed and transmitted as a digital bit-stream through the fiber. The OSD840T also
includes an optical receiver section that decodes the digital signal transmitted by the OSD840R, to
provide audio, data and relay output signals including Ethernet. The audio channels can be balanced or
unbalanced at 775mV nominal level and operate over a 22kHz bandwidth. The second audio channel
can also be configured as a front-panel-accessible 2-wire intercom suitable for commissioning and
servicing or for permanent use. The data channels can be RS232, TTL, RS422 or RS485 on one
channel and RS232 on the other channel and may operate from DC to 400kbps. User adjustable
turnaround times are provided for RS485. The fourth channel is a full duplex contact input/relay
output channel for control/alarm purposes. The OSD840T control signal receiver provides adjustment
free operation over the full optical range of the unit.
The OSD840R incorporates a high performance optical digital receiver for incoming video, audio, data
and Ethernet signals, and a transmitter that outputs a digital optical signal consisting of two audio
signal, three data channels, 1 relay channel and Ethernet. The unit provides a constant video output
level which is independent of link loss, and the audio and data section of the OSD840R is also
adjustment free over all link lengths. Audio and data signal interface levels and impedance’s are the
same as those of the OSD840T.
The OSD840T and OSD840R are available in two physical configurations: card or stand-alone case.
The card versions are designed to fit the 3RU-high 19” OSD370 chassis, which allows multiple OSD
card products to be conveniently powered from and located in the one chassis. The stand alone case
versions are intended for isolated use and require an external power source.
The OSD840 system can be used with any standard multi-mode optical fiber, and is available
optionally for single-mode fiber use. A Wavelength Division Multiplexing version is also available to
allow the use of a single fiber for transmission and reception.

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1.6 PIN ASSIGNMENTS
Pin assignments for the “Audio/Data Input/Output” DB26 high-density connector (Figure 2) is shown
in Table 3 below.
TABLE 3: PIN ASSIGNMENT
FUNCTION PIN FUNCTION PIN
Data ground 1,6 Relay input 22
Audio ground 15,18 Relay output n.o. 5
Data1 input + 10 Relay output n.c. 14
Data1 input - 19 Relay output common 23
Data1 output + 2 Audio1 input + 24
Data1 output - 11 Audio1 input - 7
Data2 input + 20 Audio1 output + 16
Data2 input - 3 Audio1 output - 25
Data2 output + 12 Audio2 input + 8
Data2 output - 21 Audio2 input - 17
RS232 input channel 3 4 Audio2 output + 26
RS232 output channel 3 13 Audio2 output - 9
NOTES:
•2-wire RS485 is available on pins 2 and 11
•Data channel 1 RS232 output is available on pin 2 when link LK6 has pins 1 and 2 connected
•Data channel 2 RS232 output is available on pin 12 when link LK4 has pins 1 and 2 connected
FIGURE 2: DB26 FEMALE HIGH DENSITY CONNECTOR
RS485 2-Wire half duplex is used to connect several devices to the same bus when only one unit
transmits data at a time. All units are normally in high impedance receive mode waiting for data. When
transmission of data is requested, the device waits for a protocol specific turn-around time delay before
transmitting after which it returns to receive mode.
RS485 4-Wire full duplex is used for master/slave arrangement. Devices are polled and respond faster
with no turn-around time delay required between request/response. The receiver is always enabled
allowing the devices to receive data even while responding to a request.
Note: If a link doesn't seem to be working correctly, try swapping the polarity of the data lines on both
ends. Some devices are marked opposite the RS485 standard.
1
910
19
18
26

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2INSTALLATION AND OPERATION
2.1 INTRODUCTION
This section outlines the methods required to install and operate the OSD840T and OSD840R
successfully. It 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 before operation. If
damage is evident, return the unit with the packaging to your supplier immediately.
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
Class 1 Class 3A
The multimode version of the OSD840 is a
Class 1 LED product. Wavelength of 850nm
and <-8dBm power output.
The singlemode and WDM versions of the
OSD840 are Class 3A laser products.
Wavelength of 1310nm and <+5dBm power
output or wavelength of 1550nm and <+7dBm
power output.
PRECAUTIONS
VAll 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
VAreas where laser products are installed should be restricted in access to trained service personnel
only and appropriate warning signs posted in the work area.
VAll laser apertures should be covered by protective covers when not connected to optical fibers.
Never leave outputs uncovered.
VLaser equipment should be positioned above or below eye level where possible. Apertures should
be positioned away from personnel.
VProtective eyewear should be worn in the vicinity of laser equipment

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2.2.2 PACKAGING
The OSD840TC and OSD840RC are designed to be mounted on an even surface and to be secured by
means of M4 or smaller screws.
The OSD840T and OSD840R card versions are designed to be inserted into a chassis and secured by
means of captivated screws.
FIGURE 3(a) provides an outer case drawing and mounting dimensions of the OSD840 case version.
FIGURE 3(b) provides a drawing and dimensions of the OSD840 card version
(a)
(b)
FIGURE 3: OSD840 CASE MOUNTING DIMENTIONS
50
100
210
4.2
8.5
DETAIL 'A'
6.6
141.3
128
15.3 109.2
DETAIL 'A'
116
43

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2.2.3 POWER SUPPLY CONNECTIONS
The OSD840 requires external DC power. The voltage range of the OSD840 is +12V to +24V. This is
connected to the power socket located at the back of the case. DC power should be connected as
indicated in Table 4.
DC power in the OSD840 card version is connected via a DB9 connector. Power is supplied by the
chassis and should be fixed into the OSD370 chassis using the captivated screws. The card can be
plugged in or out of the OSD370 chassis with power on or off.
TABLE 4: POWER CONNECTION
External Power Pin Specification
Pin 1 12V-24V DC
Pin 2 Ground
FIGURE 4: OSD840TC AND OSD840RC POWER SUPPLY CONNECTIONS
2.2.4 OTHER CONNECTIONS
The video-input signal (e.g. from camera) is connected to the video input BNC connector on the
OSD840T. The video output signal (e.g. to monitor) is connected from the video output BNC connector
on the OSD840R.
All Data, Audio and Relay signals are connected to the DB26 connector as set out in Table 3.
The 10/100 Base-T Ethernet signals are connected to the RJ45 connector on the rear of the unit. Figure
7 shows pin out configuration for the RJ45 connector.
The optical fiber cable must be terminated with the appropriate optical connector. Before connection,
inspect the ends 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 lint free tissue to remove
contamination.
Ethernet
(
RJ45
)
Data/Audio
(
DB26
)
Video
(
BNC
)
Power
2 1

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2.2.5 LINK SETTINGS
Link settings are shown in Table 5, and can be configured to suit user requirements. Link settings are
factory preset as per requirements. Only Optical Systems Design or its nominated authorized
representative should change internal link settings if required.
Both the OSD840T and the OSD840R have 7 user configurable links labeled as LK1-LK7 on the PCB.
Table 5 below lists the links and settings. Links labeled LK8-LK12 are factory set. Do not touch.
Permanent damage may occur and/or void warranty.
TABLE 5: OSD840T AND OSD840R LINKS CONFIGURATION
LK No. of
Pins FUNCTION SETTING
1 2 600R termination audio channel 1 ON/OFF
2 2 600R termination audio channel 2 ON/OFF
3 Sets RS232 at output1 to normal phasing 1,2
33 Sets RS232 at output1 to reversed phasing 2,3
3 Sets RS232 at output2 to normal phasing 1,2
43 Sets RS232 at output2 to reversed phasing 2,3
3 Sets RS232 at RS232 O/P to normal phasing 1,2
53 Sets RS232 at RS232 O/P to reversed phasing 2,3
3 Links RS232 channel 1 to output 1+ 1,2
63 Links RS422 channel 1 to output 1+ 2,3
3 Links RS232 channel 2 to output 2+ 1,2
73 Links RS422 channel 2 to output 2+ 2,3
NOTES:
•Audio Channel 2 is only active when there is no intercom phone connected to the RJ11
connector.
•“Normal phasing” refers to RS232 signal being passed through the link with the same
phase at the output as at the input.
•“Reverse phasing” refers to the output phase being opposite to that of the input. This is
useful in converting from RS422 at the input of the link to RS232 at the output.

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2.3 OPERATION
2.3.1 OSD840T OPERATION
When using the OSD840T for the first time, check that the unit is in good condition with no
visible damage.
If a card version is used, insert it in an appropriate slot on the OSD chassis and check that the indicators
illuminate accordingly on power up. If a module version (OSD840C) is used, connect the unit to an
appropriate power source and check that the indicators illuminate accordingly on power up.
In either case take special note of the “Laser OK” indicator, it should be green. If it is red there may be
a problem with the laser. Disconnect power and have the Laser checked as soon as possible.
If RS485 data is required set the RS422/485 Mode switch to the “On” position, i.e. down (which is the
1st switch of the 4way DIPswitch. It is located on the Front Panel of Card Version and on the front of
the box in Case Version). Then toggle switches 2, 3 and 4 to set the RS485 Turnaround Delay to the
value appropriate to your system. If you are not sure of the correct value, leave all Turnaround Delay
switches “Off”, i.e. up. Refer to Table 6 for delay selection. As described in Table 3, RS485 is
available on Pins 2 (RS485+) and 11 (RS485-). If RS485 is not required, keep all four switches in the
“Off” position, i.e. up.
All ‘two wire’ RS485 devices are by default in receive mode, and only change to transmit mode for
data transmission. All RS485 protocols use a transmit delay to ensure successful transmissions to the
ends of the network. The delay is data rate and protocol dependent.
If RS485 is not required, keep all four switches in the “Off” position, i.e. up.
To connect a video signal, connect a BNC terminated coaxial cable from the camera to the unit. If the
camera is operational, the "Video Present" indicator should change from Red to Green.
Finally, plug in the optical connectors of the optical cable. If the remote OSD840R is connected, the
"Data Link" LED will change from Red to Green.
Plug the digital signal source and/or audio signal into the 26-pin D connector (DB26) on the rear of the
module.
Ensure that the correct signals are connected to the correct pins of Audio/Data Input/Output connector
as specified in Table 3.
TABLE 6: OSD840T/R RS-485 TIMING DELAYS
SWITCH COMBINATIONS
1 2 3 4 FUNCTION DELAY
(±1%)
0 0 0 0 RS-422 N/A
1 1 1 1 RS-485 30us
1 0 1 1 RS-485 100us
1 1 0 1 RS-485 300us
1 0 0 1 RS-485 1ms
1 1 1 0 RS-485 3ms
1 0 1 0 RS-485 10ms
1 1 0 0 RS-485 30ms
1 0 0 0 RS-485 100ms
NOTE: Data Control Switch Settings for RS485 (0 = off, 1 = on)

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FIGURE 5: OSD840TC AND OSD840RC SIDE VIEW
2.3.2 OSD840R OPERATION
When using an OSD840R for the first time check that the unit is in good condition with no
visible damage.
If a card version (OSD840R) is used, insert it in an appropriate slot on the OSD chassis and check that
the indicators illuminate accordingly. If a module version (OSD840RC) is used, connect the unit to an
appropriate power source and check that the indicators illuminate accordingly.
The “Laser OK” indicator LED should be green in both Card and Case Versions, if the LED is red
there may be a problem with the laser. Disconnect power and have the Laser checked as soon as
possible.
If RS485 data is required set the RS422/485 Mode switch to the “On” position, i.e. down (which is the
1st switch of the 4way DIP switch. It is located on the Front Panel of Card Version and on the front of
the box in the Case Version). Then toggle switches 2, 3 and 4 to set the RS485 Turnaround Delay to the
value appropriate to your system. If you are not sure of the correct value, leave all Turnaround Delay
switches “Off”, i.e. up. Refer to Table 6 for delay selection. As described in Table 3, RS485 is
available on Pins 2 (RS485+) and 11 (RS485-). If RS485 is not required, keep all four switches in the
“Off” position, i.e. up.
All ‘two wire’ RS485 devices are by default in receive mode, and only change to transmit mode for
data transmission. All RS485 protocols use a transmit delay to ensure successful transmissions to the
ends of the network. The delay is data rate and protocol dependent.
Connect a BNC terminated coaxial cable between the BNC socket on the rear of the module and the
video monitor or switcher.
Connect the optical cable: if adequate optical power is received and signal is locked the “Data Link"
indicator will change from ‘red’ to ‘green’. If a video signal is being received the “Video Present”
indicator should be ‘green’; if no video signal is being received this indicator will be ‘red’.
Plug the digital signal source and/or audio signal into the 26-pin D connector (DB26) on the rear of the
module. Ensure that the correct signals are connected to the correct pins of Audio/Data Input/Output
connector as specified in Table 3.
4-Dip
Switch
Optical
Connecto
r
LED
Indicators Intercom
(
RJ11
)
Optical
Connecto
r

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2.3.3 INTERCOM FUNCTION
This section applies to both the OSD840T and OSD840R.
The Intercom makes use of Audio Channel 2. The Intercom is connected via the RJ11 6-pin socket on
the front panel or case. When a 2-wire phone handset is connected to the RJ11 connector, Audio
Channel 2 is automatically reconfigured to the Intercom function. The phones may be ‘hot plugged’.
While the Intercom is enabled Audio Channel 2 cannot be used for any other purpose. When a handset
is connected at one end of the link only, it may be used to page the opposite end of the link if an
appropriate amplifier and speaker are connected.
When a handset is connected to each of the OSD840T and OSD840R, a conventional Intercom circuit is
established. If one handset is in the "OFF HOOK" state, a tone is emitted from the ‘ON HOOK’ handset
at the opposite end of the link, provided they were both ‘ON HOOK’ to start with. When both handsets
are ‘OFF HOOK’, the phone link may be used. When one phone handset is returned to the ‘ON HOOK’
state, it does not cause a tone at the opposite end, and may again be taken ‘OFF HOOK’ to re-establish
the connection. Both phone handsets must be returned to the ‘ON HOOK’ state for tone signaling to be
re-enabled. Pin 5 of RJ11 is connected to an open collector NPN transistor that is turned on when
remote end is signaling. Pin 2 of RJ11 is connected to +9V via a 100Ωcurrent limiting resistor. The
RJ11 connections can be used to power an external sonalert.
FIGURE 6: RJ11 PINOUT CONFIGURATION
2.3.4 CONTROLS
The OSD840T and OSD420R each has a 4-way DIP switch (located at the front panel for Card Version
and front of box for Case Version – see Figure 6) which is used to select RS422 or RS485 mode, with
different RS485 Turnaround Delay settings from 30uSec to 80mSec. See Table 6.
There are 7 link settings available for setting up desired output configurations for AUDIO, RS232 &
RS422 outputs. Refer to section 2.2.5.
1 2 3 4 5 6 1 – N/C
2 – +9V
3 – Audio
4 – GND
5 – Sonalert
6 – N/C

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2.3.5 ETHERNET CONNECTION
The OSD840 also includes a 10/100 Base-T Ethernet connection via the RJ45 connector. Figure 7
shows the pin-out configuration for the RJ45 connector located on the rear of the OSD840 unit (see
Figure 4). The green LED indicates that an Ethernet link has been established. The amber LED
indicates the link speed. If the LED is not illuminated, the link speed is 10Mbps. If the amber LED is
illuminated, the link speed is 100Mbps.
FIGURE 7: 10/100 BASE-T ETHERNET RJ45 CONNECTION
2.3.6 OSD840T AND OSD840R INDICATORS
The LED indicators are located on the front of the OSD840 unit (see Figure 5). Figure 8 shows the
LED orientation, while Table 7 describes the function of each LED indicator.
FIGURE 8: OSD840T AND OSD840R LED INDICATORS
DI3
DI2
DI1
LINK/VPI
DO3
DO2
DO1
LASER
AO2
AI2
AO1
AI1
8 7 6 5 4 3 2 1
1: Tx+
2: Tx-
3: Rx+
4: +2.5V out
5: +2.5V out
6: Rx-
7: Ground
8: Ground
Green LED:
LINK
Amber LED:
SPEED
Amber Green

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TABLE 7: OSD840T AND OSD840R INDICATOR FUNCTION
INDICATOR PARAMETER COLOUR FUNCTION
Green Present
DI3 Data Input Ch 3 Red Not Present
Green Present
DI2 Data Input Ch 2 Red Not Present
Green Present
DI1 Data Input Ch 1 Red Not Present
Green OK
VIDEO/LINK Video Input/LINK Red Fail
Green Present
DO3 Data Output Ch3 Red Not Present
Green Present
DO2 Data Output Ch2 Red Not Present
Green Present
DO1 Data Output Ch1 Red Not Present
Green OK
LASER Optical Output Red Fail
Green Present
AO2 Audio Output Ch 2 Red Not Present
Green Present
AI2 Audio Input Ch 2 Red Not Present
Green Present
AO1 Audio Output Ch 1 Red Not Present
Green Fail Present
AI1 Audio Input Ch 1 Red Not Present
NOTE: “Link” Indicator refers to the received data stream. It is ‘green’ after the optical link is
established and the receiver is locked onto the incoming data stream and detected a low Bit Error Rate.
It will indicate ‘red’ after the Bit Error Rate reaches an unacceptable level and before the number of bit
errors has reduced to a low rate.

OPTICAL SYSTEMS DESIGN
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3MAINTENANCE
3.1 INTRODUCTION
The following section outlines the fault-finding procedure for the OSD840T and OSD840R modems.
Please take note of the following:
VPersonnel without appropriate training should not attempt any maintenance except that outlined
below.
VIf 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.
VSome components within the unit are ES sensitive and ESD precautions should be taken when
performing maintenance upon the unit.
3.2 EXTERNAL INSPECTION
Visually check for the following:
VCheck that the correct power source is connected to the power socket.
VCheck that the data signals are connected to the modem correctly and that the distant OSD840T or
OSD840R modem has been terminated correctly to any external equipment.
VInspect the optical connectors for any contamination and clean using isopropyl alcohol and a lint
free tissue if any contamination is detected.
VCheck that any external termination resistors are connected if the system configuration requires
them.
3.3 ROUTINE MAINTENANCE
VThere is no routine maintenance required with the OSD840T and OSD840R.