GE S768DAV User manual

S768DAV – S7768DAV
Fiber O
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tic Transmission S
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© 2003 GE Interlogix, Video Systems Group
All Rights Reserved.
Any GE Interlogix, Video Systems Group, software
supplied with GE Interlogix, Video Systems Group,
products is proprietary and furnished under license
and can be used or copied only in accordance with
the terms of such license.
This equipment has been tested and
found to comply with the limits for a
Class A digital device, pursuant to part
15 of the FCC Rules. These limits are
designed to provide reasonable
protection against harmful interference
when the equipment is operated in a
commercial environment. This
equipment generates, uses, and can
radiate radio frequency energy and, if
not installed and used in accordance
with the instruction manual, may cause
harmful interference to radio
communications.
You are cautioned that any changes or
modifications not expressly approved by
the party responsible for compliance
could void the user's authority to
operate the equipment.
This document contains proprietary information that is
protected by copyright. No part of this document may
be reproduced or transmitted in any form or by any
means without the prior written permission of
GE Interlogix, Video Systems Group.
The information contained in this document is subject
to change without notice. GE Interlogix, Video
Systems Group, in keeping pace with technological
advances, is a company of product innovation.
Therefore, it is difficult to ensure that all information
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responsibility for inaccuracies or omissions and
specifically disclaims any liabilities, losses, or risks,
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For the latest product specifications, visit
GE Interlogix, Video Systems Group, online at
www.GE-Interlogix.com or contact your GE Interlogix,
Video Systems Group, sales representative.
For technical support before and after installation, call 800-469-1676.
Technical support is available 24 hours a day, 7 days a week.
Call: Tech Support 800-469-1676 (6 A.M. – 5 P.M. PST Monday through Friday)
Tech Support 541-740-3589 (all other times)
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S768DAV – S7768DAV User Manual Table of Contents
11-0768DAV-B/ December 2003 3
TABLE OF CONTENTS
BEFORE YOU BEGIN ..........................................................................................................5
1INTRODUCTION ............................................................................................................7
2MODULE SETUP ..........................................................................................................8
2.1 UNPACKING THE UNIT .......................................................................................... 8
2.2 DATA TRANSLATION ............................................................................................ 8
2.3 INPUT/OUTPUT DATA FORMAT.............................................................................. 8
2.3.1 MANUAL DATA SELECTION ......................................................................... 9
2.3.2 AUTO DATA CONFIGURATION.................................................................... 10
2.4 OPTICAL/VIDEO ALARMS.................................................................................... 10
2.5 VIDEO FORMAT/TEST PATTERN GENERATOR....................................................... 11
2.6 AUDIO LEVEL .................................................................................................... 11
2.7 INPUT IMPEDANCE ............................................................................................. 12
3INSTALLATION ...........................................................................................................13
3.1 RACK CARDS .................................................................................................... 13
3.2 502R RACK CARD ENCLOSURES ....................................................................... 13
3.3 CONNECTIONS .................................................................................................. 14
3.3.1 BACK PANEL CONNECTIONS ..................................................................... 15
3.3.2 INTERFACE BOARD CONNECTIONS ............................................................ 16
3.3.3 BUILT-IN TERMINATION ............................................................................ 19
3.3.4 VIDEO CABLE CONNECTIONS.................................................................... 20
3.3.5 AUDIO CONNECTIONS .............................................................................. 20
3.3.6 FIBER OPTIC CABLE CONNECTIONS .......................................................... 20
3.3.7 STANDALONE MODULE POWER CONNECTIONS........................................... 21
3.3.8 RACK MODULE POWER CONNECTIONS ...................................................... 21
4OPERATION...............................................................................................................22
4.1 NORMAL OPERATION ......................................................................................... 22
4.2 LED OPERATION .............................................................................................. 22
4.2.1 LASER INDICATOR ................................................................................. 22
4.2.2 LEVEL/LOSS INDICATOR ....................................................................... 23
4.2.3 VIDEO IN/OUT INDICATORS ................................................................... 23
4.2.4 AUDIO 1, 2 IN/OUT INDICATORS ............................................................ 23

Table of Contents S768DAV – S7768DAV User Manual
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4.2.5 DATA 1, 2 IN/OUT INDICATORS.............................................................. 23
4.2.6 CONTACT 1, 2 IN/OUT INDICATORS ...................................................... 24
4.2.7 ENABLED 1, 2 INDICATORS.................................................................... 24
4.3 VIDEO TEST PATTERNS ..................................................................................... 24
4.4 TEST MODE ...................................................................................................... 24
5TROUBLESHOOTING...................................................................................................26
APPENDIX A: RS485 APPLICATION NOTES.......................................................................27
A.1 INTRODUCTION ................................................................................................. 27
A.2 CONNECTION .................................................................................................... 27
A.3 CONFIGURATION ............................................................................................... 27
A.4 TERMINATION.................................................................................................... 27

S768DAV – S7768DAV User Manual Before You Begin
BEFORE YOU BEGIN
Read these instructions before installing or operating this product.
Note: This installation should be made by a qualified service person and should conform to local codes.
This manual provides installation and operation information. To use this document, you must have the
following minimum qualifications:
! A basic knowledge of CCTV systems and components
! A basic knowledge of electrical wiring and low-voltage electrical hookups
Intended use
Use this product only for the purpose for which it was designed; refer to the product specification and user
documentation.
Customer Support
For assistance in installing, operating, maintaining, and troubleshooting this product, refer to this
document and any other documentation provided. If you still have questions, please contact
Technical Support and Sales:
GE Interlogix, Video Systems Group
Call: 800-469-1676
Fax: [phone]
Note: You should be at the equipment and ready with details before calling Technical Support.
Conventions Used in this Manual
Boldface or button icons highlight command entries. The following WARNING, CAUTION, and Note
statements identify potential hazards that can occur if the equipment is handled improperly:
* WARNING:
Improper use of this equipment can cause severe bodily injury or equipment damage.
** CAUTION:
Improper use of this equipment can cause equipment damage.
Note: Notes contain important information about a product or procedure.
* This symbol indicates electrical warnings and cautions.
** This symbol indicates general warnings and cautions.
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Before You Begin S768DAV – S7768DAV User Manual
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S768DAV – S7768DAV User Manual Introduction
1 INTRODUCTION
This is a guide to the installation and operation of the S768DAV and S7768DAV series fiber optic video,
audio, data, and contact closure transmission system. Please read the entire manual before installing the
equipment.
NOTE: The series numbers S768DAVT and S768DAVR are used to describe all models of transmitters and receivers unless noted
otherwise.
The Series S768DAV and S7768DAV transmission systems offer simultaneous real-time transmission of:
! One channel of two-way 9-bit digital video
! Two channels of two-way high quality audio (HQA)
! Two channels of two-way multi-protocol data (MPD)
! Two channels of two-way relay/contact closures
The S768DAV system operates over one or two multimode fibers and the S7768DAV uses one or two
single-mode fibers. A complete system consists of an S768DAVT transmitter and an S768DAVR receiver.
Units are designed for installation in the 515R1 or 517R1 Card Cages or in the 502R rack card enclosure.
Figure 1 shows a basic system diagram.
Figure 1. S768DAV System Diagram
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Module Setup S768DAV – S7768DAV User Manual
2 MODULE SETUP
2.1 UNPACKING THE UNIT
In the event that anything is missing from the following list, contact your authorized dealer or
representative.
! S768DAVT (S7768DAVT) Transmitter or S7768DAVR (S7768DAVR) Receiver
! User Manual
Save the original packing materials in case it becomes necessary to return the unit.
CAUTION:
Take all necessary precautions to protect the unit from static electricity during the following procedures.
Equipment damage may result.
2.2 DATA TRANSLATION
The data translation capability of the S768DAV series is unique in the industry. It enables translation from
one data format to another and eliminates the need for external translation devices.
The translation is in the physical layer only; it cannot interpret specific protocols or translate commands.
Due to the encoding schemes utilized in Manchester and Biphase, these formats are exempt from
translation. Data translation examples are shown in Table 1.
Table 1. Data Translations
Translation TX Switch
Setting RX Switch Setting Comments
TTL to RS232 three-wire 3 1 Signal level conversion
RS232, three-wire to TTL 1 3 Signal level conversion
TTL to RS422 3 4 Single ended to differential conversion
RS422 to TTL 4 3 Differential to single ended conversion
RS232, three-wire to RS422 1 4 Single ended to differential conversion
RS422 to RS232, three -wire 4 1 Differential to single ended conversion
RS232, five-wire to RS485 2 7 - A RS232 handshaking bit is used to indicate tri-state
RS485 to RS232, five-wire 7 – A 2 Tri-State detection circuitry activates handshaking bit
2.3 INPUT/OUTPUT DATA FORMAT
Determine the data formats required for input and output for both data channels. The data formats may
be the same or different for each channel. The data format can also differ from input to output on the
same data channel.
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S768DAV – S7768DAV User Manual Module Setup
2.3.1 MANUAL DATA SELECTION
To set the data format for channels 1 and 2, see Figure 2, Figure 3, Table 2 and perform the following.
1) Select a data format for each Data channel on the transmitter using DATA SELECT switch SW1
(channel 1) and SW2 (channel 2).
2) Select a data format for each Data channel on the receiver using DATA SELECT switch SW1
(channel 1) and SW2 (channel 2).
NOTE: The DATA SELECT switches, SW1 and SW2 on the audio/data card, are shipped in the Auto Configure setting (position 0).
SW1 SW7 SW5 SW4 SW6
SW3 SW8 SW2
Figure 2. S768DAV Location of Switches
Figure 3. DATA SELECT Switches SW1 and SW2
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Module Setup S768DAV – S7768DAV User Manual
Table 2. DATA SELECT SW1/SW2 Settings
Setting Data Mode Setting Data Mode
0 Not Configured or Auto Configuration 8 RS485 two -wire, 2V offset
1 RS232 9 RS485 four-wire standard
2 RS232 with handshake A RS485 four-wire, 1V offset
3 TTL B RS485 four-wire, 2V offset
4 RS422 two-wire C Not used
5 Manchester/Biphase D Not used
6 RS485 two-wire Standard or SensorNet E Receiver Test mode
7 RS485 two -wire, 1V offset F Transmitter Test mode
2.3.2 AUTO DATA CONFIGURATION
The S768DAV modules can be set for Auto Data Configuration, where the format of the data on channel
1 or channel 2 is controlled from one unit, either the transmitter or the receiver. To use the Auto Data
Configuration feature, perform the following.
1) Set the DATA SELECT switches SW1 or SW2 on one unit to position 0 (default setting).
2) Set the DATA SELECT switches SW1 or SW2 on the other unit to the desired format.
3) If the data format needs to be changed for a particular channel, only the DATA SELECT switches
on one unit need to be changed. The other unit remains in position 0 and will auto-configure
according to the selected data format.
2.4 OPTICAL/VIDEO ALARMS
Rack cards are supplied with alarm functions that activate if the optical or video signal input to the module
fails. These alarms can be output to the rack power supply, where an audible alarm and alarm output
contact closure can be activated. The optical and video alarms are controlled using DIP switch SW3 on
the audio/data card. To set the optical and video alarms, see Figure 2 and Figure 4 and perform the
following.
Figure 4. ALARM Switch SW3
1) Set switch SW3-1 to ON to enable the FIBER (optical) alarm.
2) Set SW3-2 to ON to enable the VIDEO alarm.
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S768DAV – S7768DAV User Manual Module Setup
3) If the optical or video alarm output is not desired, set the corresponding DIP switch (SW3-1 or
SW3-2) to OFF.
NOTE: Setting ALARM switches SW3-1 and SW3-2 to OFF does not affect the operation of the LEVEL/LOSS or VIDEO LEDs. A
red LED always indicates signal loss.
2.5 VIDEO FORMAT/TEST PATTERN GENERATOR
The S768DAV links support both NTSC and PAL video standards without adjustment. DIP switch SW8 on
the S768DAVT transmitter and S768DAVR receiver audio/data cards enable the test pattern generator
and select the video format. To enable the test pattern generator and set the video format, see Figure 2
and Figure 5 and perform the following.
Figure 5. VIDEO FORMAT/TEST PATTERN GENERATOR Switch SW8
1) Set DIP switch SW8 on the transmitter and receiver to the desired position.
2) Ensure the switches on the transmitter and receiver are set to the same video format.
NOTE: In order for the test pattern generator to operate properly, both the transmitter and receiver must be set to the same format.
2.6 AUDIO LEVEL
The S768DAV system features dual audio level operation to meet the system requirements of -10 dBu
audio reference and 0 dBu/+4 dBu audio reference level. All units are shipped with the audio level
switches set to 18 dBu (0 dBu audio reference level). At this setting, the 18 dB of operating range will
support maximum audio levels of +18 dBu. Switches SW4, SW5, and SW7 on the audio/data card select
the input and output audio levels. To set the audio levels, see Figure 2 and Figure 6 and perform the
following.
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Module Setup S768DAV – S7768DAV User Manual
Figure 6. AUDIO LEVEL Switches SW4, SW5, and SW7
1) If a low audio input level causes the output audio signal to degrade, the input sensitivity of the
S768DAV can be increased by switching to the 8 dBu maximum scale.
2) For systems running at -10 dBu, typical for VCRs and DVD players, switches SW4, SW5, and SW7
should be set to 8 dB.
3) You can set the transmitter input to 8 dBu and the receiver output to 18 dBu to add 10 dB of gain to
the system, however, this also increases system signal-to-noise ratio (S/N).
2.7 INPUT IMPEDANCE
The S768DAV units are shipped with the input impedance set at high impedance (high-Z). To select a
600Ωinput impedance in place of the high-Z input, set switch SW6 on the audio/data card to 600. See
Figure 2 and Figure 7.
Figure 7. IMPEDANCE Switch SW6
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S768DAV – S7768DAV User Manual Installation
3 INSTALLATION
This fiber-optic link is supplied as a rack card. The rack cards can also be used in a standalone
configuration if placed in a 502R rack card enclosure.
Units should be installed in dry locations protected from extremes of temperature and humidity.
3.1 RACK CARDS
Rack cards are installed in a 19-inch (483-mm), EIA standard card-cage rack, either the 515R1 or the
517R1. Follow these guidelines to install rack cards.
CAUTION:
Although rack cards are hot-swappable and can be installed without turning off power to the rack, the
power switch on the rack power supply should be turned off and the rack power supply disconnected
from any power source before installing rack cards.
1) Make sure that the card is oriented right-side up, and slide it into the card guides in the rack until the
edge connector at the back of the card seats in the corresponding slot in the rack’s connector panel.
Seating may require thumb pressure on the top and bottom of the card’s front panel.
CAUTION:
Do not press on any of the LEDs when installing cards into the rack. Equipment damage may result.
2) Tighten the two thumbscrews on the card until the front panel of the card is seated against the front
of the rack.
3.2 502R RACK CARD ENCLOSURES
To install rack cards in the 502R rack card enclosure, see Figure 8 and perform the following.
CAUTION:
The rack card module can be powered only by 13.5 - 16 VDC. AC power must not be used. It is
recommended that the 613P power adapter be used to supply power to the module. Damage to the
equipment may result if AC power is used.
CAUTION:
Complete all instruction steps before supplying power to the unit.
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Installation S768DAV – S7768DAV User Manual
1) Look inside the enclosure to determine the location of the socket for the edge connector on the
card. Orient the card so that it will seat in the socket, and slide it into the card guides in the
enclosure until the edge connector at the back of the card seats in the socket. Seating may require
thumb pressure on the top and bottom of the card’s front panel.
CAUTION:
Do not to press on any of the LEDs when installing cards into the enclosure. Equipment damage may
result.
2) Tighten the two thumbscrews on the card until the front panel of the card is seated against the front
of the enclosure.
3) Determine where the module will be installed, and ensure that there is adequate space for making
the various cable connections and for reading the diagnostic LEDs.
NOTE: The type of screws chosen must be suitable for the surface on which the module is to be mounted.
4) Standalone modules can be attached to suitable flat surfaces with four No. 6 (3 mm) screws. After
the enclosure is securely attached to a flat surface, the cable connections can be made.
Figure 8. 502R Rack Card Enclosure Mounting Data
3.3 CONNECTIONS
All video, audio, data, contact, and fiber connections are made to the back panel of the S768DAV
module. When connecting audio, data, or contact signals, always wire the signal OUT pins on the
audio/data equipment to the signal IN pins on the fiber links, and the signal IN pins on the audio/data
equipment to the signal OUT pins on the fiber links. See Figure 9.
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S768DAV – S7768DAV User Manual Installation
Audio/Data Equipment S768DAV Link
Figure 9. S768DAV Fiber Link Audio – Data – Contact Connections
3.3.1 BACK PANEL CONNECTIONS
Audio, data, and contact signals can be connected directly to the unit by wiring a 26-pin male D-connector
(AMP plug part number 748474-1, pin part number 748333-4) and attaching it to audio/data connector J4
on the back panel of the unit. See Figure 10. Table 3 lists the signal and pin information.
Audio/Data
Video Out
Optical In
Optical Out
Video In
Note: Optical In connector is not present on 1-Fiber models.
Figure 10. S768DAV 2-Fiber Module Back Panel Connections
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Installation S768DAV – S7768DAV User Manual
Table 3. J4 Audio/Data Connections
Pin Signal Pin Signal
1 AUDIO CHANNEL 1 OUT + 14 AUDIO CHANNEL 1 IN -
2 GROUND 15 AUDIO CHANNEL 2 IN +
3 AUDIO CHANNEL 2 OUT - 16 GROUND
4 CONTACT CHANNEL 1 IN + 17 DATA CHANNEL 1 OUT -
5 AUDIO CHANNEL 1 IN + 18 DATA CHANNEL 1 IN -
6 AUDIO CHANNEL 2 IN - 19 CONTACT CHANNEL 2 OUT -
7 DATA CHANNEL 1 OUT + 20 CONTACT CHANNEL 1 OUT +
8 DATA CHANNEL 1 IN + 21 CONTACT CHANNEL 1 OUT -
9 DATA CHANNEL 2 IN - 22 +5 VDC BIAS
10 CONTACT CHANNEL 2 OUT + 23 GROUND
11 AUDIO CHANNEL 1 OUT - 24 DATA CHANNEL 2 OUT +
12 AUDIO CHANNEL 2 OUT + 25 DATA CHANNEL 2 OUT -
13 CONTACT CHANNEL 2 IN + 26 DATA CHANNEL 2 IN +
3.3.2 INTERFACE BOARD CONNECTIONS
The S768DAV units are also supplied with an interface board that attaches directly to the back of the
module. The interface board contains screw terminal connectors for the audio, data, and contact inputs
and outputs. Refer to Figure 11 and Table 4 through Table 14 for interface board wiring information.
J2 J4 J6
J1
Mates with J4
on S768DAV
Back Panel
J3 J5 J7
Figure 11. S768DAV Interface Board
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S768DAV – S7768DAV User Manual Installation
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Table 4. Interface Board Connections
Pin Signal Pin Signal
Connector J2 Connector J3
1 GROUND 1 GROUND
2 DATA CHANNEL 1 OUT + 2 DATA CHANNEL 2 OUT +
3 DATA CHANNEL 1 OUT - 3 DATA CHANNEL 2 OUT -
4 +5 VDC BIAS 4 +5 VDC BIAS
5 DATA CHANNEL 1 IN + 5 DATA CHANNEL 2 IN +
6 DATA CHANNEL 1 IN - 6 DATA CHANNEL 2 IN -
7 TERMINATION 7 TERMINATION
8 GROUND 8 GROUND
Connector J4 Connector J5
1 AUDIO CHANNEL 1 IN + 1 AUDIO CHANNEL 2 IN +
2 AUDIO CHANNEL 1 IN - 2 AUDIO CHANNEL 2 IN -
3 GROUND 3 GROUND
4 AUDIO CHANNEL 1 OUT + 4 AUDIO CHANNEL 2 OUT +
5 AUDIO CHANNEL 1 OUT - 5 AUDIO CHANNEL 2 OUT -
6 GROUND 6 GROUND
Connector J6 Connector J7
1 CONTACT CHANNEL 1 IN + 1 CONTACT CHANNEL 2 IN +
2 CONTACT CHANNEL 1 IN - 2 CONTACT CHANNEL 2 IN -
3 CONTACT CHANNEL 1 OUT + 3 CONTACT CHANNEL 2 OUT +
4 CONTACT CHANNEL 1 OUT - 4 CONTACT CHANNEL 2 OUT -
Table 5. J2/J3 Connections for RS232 Data
SW1 / SW2 – Position 1
Pin Signal
1 GROUND/SHIELD
2 RS232 OUT
3 NO CONNECTION
4 NO CONNECTION
5 RS232 IN
6 NO CONNECTION
7 NO CONNECTION
8 GROUND
Table 6. J2/J3 Connections for RS232 Data with
Handshaking
SW1 / SW2 – Position 2
Pin Signal
1 GROUND/SHIELD
2 RS232 OUT
3 RTS/CTS OUT
4 NO CONNECTION
5 RS232 IN
6 RTS/CTS IN
7 NO CONNECTION
8 GROUND

Installation S768DAV – S7768DAV User Manual
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Table 7. J2/J3 Connections for TTL Data
SW1 / SW2 – Position 3
Pin Signal
1 GROUND/SHIELD
2 NO CONNECTION
3 TTL OUT
4 NO CONNECTION
5 TIE TO PIN 1
6 TTL IN
7 NO CONNECTION
8 GROUND
December 2003
Table 8. J2/J3 Connections for RS422 Data
SW1 / SW2 – Position 4
Pin Signal
1 GROUND/SHIELD
2 RS422 OUT -
3 RS422 OUT +
4 NO CONNECTION
5 RS422 IN -
6 RS422 IN +
7 NO CONNECTION
8 GROUND
Table 9. J2/J3 Connections for Manchester/Biphase Data
SW1 / SW2 – Position 5
Pin Signal
1 MANCHESTER/BIPHASE OUT -
2 MANCHESTER/BIPHASE OUT +
3 NO CONNECTION
4 NO CONNECTION
5 MANCHESTER/BIPHASE IN -
6 MANCHESTER/BIPHASE IN +
7 NO CONNECTION
8 GROUND
Table 10. J2/J3 Connections for Manchester/Biphase
Termination Unit Data
SW1 / SW2 – Position 5
Pin Signal
1 MANCHESTER/BIPHASE OUT -
2 MANCHESTER/BIPHASE OUT +
3 NO CONNECTION
4 NO CONNECTION
5 MANCHESTER/BIPHASE IN -
6 MANCHESTER/BIPHASE IN +
7 TERMINIATION - TIE TO PIN 5
8 GROUND
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Manual title Table of Contents
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Table 11. J2/J3 Connections for RS485 2-Wire Data
SW1 / SW2 – Position 6 (standard offset)
Position 7 (1V offset)
Position 8 (2V offset)
Pin Signal
1 GROUND/SHIELD
2 NO CONNECTION
3 NO CONNECTION
4 +5 VDC BIAS OUT
5 RS485 -
6 RS485 +
7 TERMINATION – TIE TO PIN 5
8 GROUND
Table 12. J2/J3 Connections for RS485 4-Wire Data
SW1 / SW2 – Position 9 (standard offset)
Position A (1V offset)
Position B (2V offset)
Pin Signal
1 GROUND/SHIELD
2 RS485 OUT -
3 RS485 OUT +
4 +5 VDC BIAS OUT
5 RS485 IN -
6 RS485 IN +
7 TERMINATION – TIE TO PIN 5
8 GROUND
Table 13. J2/J3 Connections for SensorNet Data
SW1 / SW2 – Position 6
Pin Signal
1 GROUND/SHIELD
2 NO CONNECTION
3 NO CONNECTION
4 +5 VDC BIAS OUT
5 SENSORNET -
6 SENSORNET +
7 TERMINATION – TIE TO PIN 5
8 GROUND
Table 14. J2/J3 Connections for Test Mode Loopback
SW1 / SW2 – Position F
Pin Signal
1 NO CONNECTION
2 TIE TO PIN 5
3 TIE TO PIN 6
4 NO CONNECTION
5 TIE TO PIN 2
6 TIE TO PIN 3
7 NO CONNECTION
8 GROUND
3.3.3 BUILT-IN TERMINATION
The S768DAV features a built-in termination on the Interface Board for RS485, Manchester, Biphase, and
SensorNet installations. Refer to Table 4, and Table 10 through Table 13.

Installation S768DAV – S7768DAV User Manual
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3.3.4 VIDEO CABLE CONNECTIONS
CAUTION:
Make sure all peripheral equipment that will be connected to the fiber unit is turned OFF during
installation. Damage to equipment may result.
NOTE: Belden number 9259 or equivalent RG59/U coaxial cable should be used between the video equipment and the fiber units.
Do not exceed the maximum distance recommended by the manufacturer of the video equipment.
NOTE: Coaxial cable must be terminated with female BNC connectors to properly connect with the fiber links.
Connect the video equipment, such as a camera and monitor, to the input and output BNC jacks on the
S768DAV transmitter and receiver using terminated coaxial cable. See Figure 10.
3.3.5 AUDIO CONNECTIONS
Audio input and output signals are connected to the 26-pin connector located on the back of the module,
or to the screw terminal connectors on the Interface board supplied with the unit. See Figure 10 and
Figure 11. Refer to Table 3 and Table 4 for wiring information.
NOTE: Signal strength remains the same regardless of type of connection.
Audio connection options include:
! Balanced transmitter input to balanced receiver output
! Balanced transmitter input to unbalanced receiver output
! Unbalanced transmitter input to unbalanced receiver output
! Unbalanced transmitter input to balanced receiver output
1) For a balanced connection, connect the external equipment to the (+) and (-) pins of the desired
channel.
2) For an unbalanced connection, add a short jumper between the (-) pin and the ground pin.
3.3.6 FIBER OPTIC CABLE CONNECTIONS
Most cable manufacturers identify the individual fibers in the cable. Select appropriately terminated fiber
and mark both ends with a unique identification label (e.g. for cable no. 03, fiber no. 08) to ensure that the
fiber connected to the near end is the same as the one connected to the far end.
The proper optical connection will link the transmitter's TRANSMIT (OUT) port to the receiver's RECEIVE
(IN) port. See Figure 10.
1) Wipe the inside of the port’s sleeve with a lint-free pipe cleaner moistened with reagent-grade
isopropyl alcohol. Blow dry with dry air.
2) Clean the connector using a lint-free cloth dampened with reagent-grade isopropyl alcohol.
Thoroughly wipe the side and end of the ferrule. Blow the ferrule dry with dry air. Visually inspect
the ferrule for lint.
3) Fasten the fiber optic cable to the port.
20 December 2003