ALFTECH FDAT-EN2 User manual

FIBRE DIGITAL AUDIO TRANSCEIVER
User'sManual
Electrostatic Discharge: The product can be damaged by electrostatic
discharge, thus care must be taken when handling the product. Failure to
observe proper handling and installation procedures can cause damage.
Electrostatic Discharge damage can range from performance degradation to
complete product failure.
Important Safety Instructions
Please follow these precautions when using this product:
Read these instructions. Keep these instructions. Heed all warnings. Follow all
instructions.
WATER AND MOISTURE: Designed for indoor use only. The product is not
protected against liquids. It should not be exposed to dripping or splashing
and no objects filled with liquids, shall be placed on the product.
INSTALLATION: The product must always be installed by qualified service
personnel. Install in accordance with the manufacturer's instructions. Always
disconnect the supply power before installing the product. Do not install near
any heat sources such as radiators, heaters, or other apparatus that produce
heat.
POWER SOURCES: The product should be connected to a power supply only
of the type described in the operating instructions or as marked on the unit.
SERVICING: Contains no user serviceable parts. Do not attempt to repair the
product, as this will void the warranty.
FUSING: Never bypass or use any other type of fuse. Replace only with the
same type of fuse as found in the operating instructions. Fuses must only be
replaced by qualified service personnel. Always disconnect from power before
replacing fuses.

Product User’s Notice
No part of this manual, including the products and software described in it, may be reproduced,
transmitted, transcribed, stored in a retrieval system, or translated into any language in any form or
by any means, except documentation kept by the purchaser for archiving purposes, without the
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ALFTECH provides this manual "as is" without warranty of any kind, either expressed or
implied, including but not limited to the implied warranties or conditions of
merchantability or fitness for a particular application or purpose. In no event shall
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incidental, or consequential damages (including damages for loss of profits, loss of
business, loss of use, interruption of business and the like), even if ALFTECH has been
advised of the possibility of such damages arising from any defect or error in this manual
or product.
Limited Warranty
No warranty registration is necessary to obtain warranty on ALFTECH products. Please
save your proof of purchase receipt. If you do not provide proof of the initial purchase date
at the time warranty service is requested, the manufacturing date of the product will be
used to determine the warranty period.
1. ALFTECH will repair or replace free of charge, any part or parts of the Product that are defective, but subject to
the following conditions:
1.1 Transportation charges on equipment and/or parts submitted for repair or replacement under this warranty must by
borne by the Purchaser, Distributor, Re-seller and/or End user;
1.2 The warranty period begins on the date of purchase by the first retail consumer or commercial end user
and continues for the period of two (2) years from that date;
1.3 ALFTECH shall have the sole discretion whether to replace or repair the Product, and the replacement
Product shall be of equivalent or better specifications, relative to the defective product but need not be
identical.
2. The warranty does not extend to repairs required because of:
2.1Problems caused by parts or systems that do not form an integral part of the Products;
2.2 Equipment control, use, maintenance or installations that are not in accordance with instructions and
manuals provided by ALFTECH for the product;
2.3 the product is repaired, modified or altered, unless such repair, modification is authorized in writing by
ALFTECH; or
2.4 the product serial number is defaced or missing;
2.5 Normal use which has exhausted the life of the product.
3. ALFTECH makes no warranty that the operation of its software products will be uninterrupted or absolutely
error-free, and no warranty that all defects in the software product within or without the scope of ALFTECH's
applicable product documentation will be corrected.
4.This warranty does not extend to any Batteries if installed in the Product;
5.This warranty does not extend to any equipment, installation, assembly or system for which the supplier or
installer thereof provides a separate warranty, in which event the End user have to exercise his right and claim
against such a supplier or installer in accordance with such a warranty;
6.This warranty does not extent to the installation, setup and configuration of the Product, for which the supplier
and/or installer are liable in their respective capacities.
Products and Corporate names appearing in this manual may or may not be registered trademarks or
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This product/publication includes images from CorelDRAW®9 which are protected by the copyright
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Specifications and Information contained in this manual are furnished for information
only, and are subject to change at any time without notice, and should not be construed as
a commitment by ALFTECH. ALFTECH assumes no responsibility or liability for any errors
or inaccuracies that may appear in this manual, including the products and the software
described in it.
Copyright © 2005Alf Electro-Technical Services CC. All rights reserved.
Product Name: FDAT-EN2 FDAT-TX Transmitter
FDAT-RX Receiver
Printed:February, 2005 Product User's Manual
Contact Information
Alf Electro-Technical Services CC t/a ALFTECH
Corporate Headquarters
Address (Physical): 30 Irene Ave., Somerset West, 7130, CAPE, South Africa
Address (Postal): PO Box 1718, Somerset West, 7129, CAPE, South Africa
Telephone: [phone]
Fax: [phone]
E-Mail: [email protected]
Marketing, Sales & Technical Support
Telephone: [phone]
Fax: [phone]
E-Mail: [email protected]
www:www.alftech.com
UsersManual
FIBRE
DIGITAL A
UDIO
TRANSCEIVER
CONTENTS
Introduction 1
FDAT-TX EN2 the FDAT Transmitter 1
FDAT-RX EN2 the FDAT Receiver 1
Hardware Features 2
Functional Description 2
Transmitter Connections 2
Transmitter Indicators 2
Receiver Connections 2
Receiver Indicators 2
Hardware Ordering Options 2
FDAT-EN2 Transceivers Specifications 3
Recommended Operating Conditions 3
Absolute Maximum Ratings *3
Electrical Characteristics 3
Cautions 4
Physical Connection 4
PHOENIX Contact Connectors (Supplied with the DAPP-EN2) 4
Physical Layout and Dimensions 5
FDAT-EN2 5
FDAT-EN2 +A 6
Alf Electro-Technical Services C.C.
(Reg. No.: CK1999 05574/23)
PO Box 1718
Somerset West
7129, CAPE
South Africa
www.alftech.com

1
Introduction
Product Overview: Fibre Digital Audio Transceiver
FDAT-TX EN2 the FDAT Transmitter
The FDAT-TX transmits 2 audio (optionally 4), and 24 digital inputs to the
FDAT-RX Receiver via a fiber-optic cable. The Transmitter receives balanced
audio inputs and converts it to digital format. This digital signal is combined
with the 24 digital inputs, and then transmitted via fibre-optic cable to the
Receiver. The digital inputs are
active LOW. As an example,
the Inputs can be connected
to relay outputs or directly to
switches.
The LED level indicator can be
used to set the input audio to
the appropriate level to
prevent overdriving the
analog-to-digital converters.
The audio inputs has another
7 dB headroom from the time
when the RED 0 dB LED lights
up, before the audio output on
the FDAT-RX Receiver will clip.
The 0dB LED corresponds to
+4dBu.
FDAT-RX EN2 the FDAT Receiver
The FDAT-RX receives the data via the fibre-optic, and separates the audio
data from the digital data. The
2 audio signals (optionally 4)
are output via balanced line
outputs. The digital outputs
have a transistor pull down
output.
If a relay is used, it must be
connected between the output
and the 24 V supply. If the
fibre is not connected, or there
is a fault with the FDAT-TX
transmitter, the outputs will all
be off, and the SYNC LED will
be OFF. The fault output line
will be ON (pulled LOW) in a
fault condition.
2
Hardware Features
•2 channels balanced audio (optionally 4)
•24 inputs to transistor pull down outputs
•Line Fault transistor pull down output on FDAT-RX Receiver
•Audio level indicator for setup on FDAT-TX Transmitter
Functional Description
The FDAT-TX EN2 is an audio-data fibre optic transmitter, in a Frame Mount
form factor. Two audio channels and 24 digital inputs are transmitted to the
FDAT-RX Receiver. The FDAT-RX Receiver will indicate if a valid link is
maintained, and if not, a fault output will be activated. The audio will be
muted, and all outputs will be switched off.
Transmitter Connections
•24 V DC supply input
•24 inputs
•2 Balanced audio line-inputs (optionally 4)
•Optic-Fiber output
Transmitter Indicators
•Power LED
•5 Input level Indicator LED's
Receiver Connections
•24 V DC supply input
•24 pull down transistor outputs
•System fault pull down transistor output
•2 Balanced audio line-outputs (optionally 4)
•Optic-Fiber input
Receiver Indicators
•Power LED
•Data SYNC LED
Hardware Ordering Options
Part Number Description
Frame Mount form factor, including all features as described above;
Select: ST Fibre Connecter (Standard), or SMA Fibre Connector;
2 additional audio channels
FDAT–EN2 +ST +A

3
FDAT-EN2 Transceivers Specifications
Recommended Operating Conditions (0° C to + 55 °C)
PARAMETER CONDITION MIN TYP MAX UNITS NOTES
Supply Voltage 20 24 28 V
Signal Input Voltage 028 V
Absolute Maximum Ratings *
Voltage on V Supply, Relative to Ground 0 V to +34 V
Voltage on Signal input pins, Relative to Ground –60 V to +60 V
Operating Temperature 0 °C to +70 °C
Storage Temperature 5 °C to +55 °C
*Exposure to absolute maximum rating conditions for extended periods of time may
affect reliability.
Electrical Characteristics (Over the Operating Range)
PARAMETER CONDITION MIN TYP MAX UNITS NOTES
Supply Current 24V DC –TX Transmitter 75 mA 1
24V DC –RX Receiver 90 mA 2
Trigger input Current Input pulled to ground 5mA
Trigger input resistance From 24V to trigger ~4.7 kΩ
Trigger HIGH level Voltage 21 V3
Trigger LOW level Voltage 3V3
Trigger input to output delay 10 ms 4
Relay output Current Transistor output pull down 500 mA 5
Audio Input and Output Level 0 dB LED turns ON +4 dBu 6
Audio gain Input to output -0.25 0+0.25 dB
Audio headroom 7dB 7
Audio sample rate ±44.5 kHz
Audio resolution 24 Bits
Audio input impedance TX Transmitter(differential) 24 kΩ
Audio output impedance RX Receiver(differential) 44 Ω
Frequency response ± 0.3 dB 20 20k Hz
Inter channel gain difference ±0.25 dB
LED indicator accuracy ±0.5 dB
Crosstalk 1kHz >80 dB
Total Harmonic Distortion +10dBu (1kHz) <0.002 %
Notes
1. No audio input, and all triggers off. For every trigger another approx 5mA must be added.
2. The current is the supply current through the +24 V supply line. If all outputs are ON, the
supply current should increase by less than 10 mA. This is because the relay outputs are
pulled down, thus the relay current goes through the GND terminal.
3. The Signal input voltage should never be allowed to be between the maximum LOW-level,
and the minimum HIGH-level input voltage.
4. Delay from when the FDAT-TX Transmitter received a trigger input, to until the FDAT-RX
Receiver's output switches ON or OFF.
5. The relay outputs are in 3 banks of 8 outputs each. If all 8 outputs per bank are ON
permanently, they are each allowed to draw only 125 mA. Only use 24 V relays, with a
resistance of more than 200 ohm. Each relay output has a 22 k pull-up resistor and a
protection diode connected directly to the 24 V supply.
6. The input and output level are between the hot and cold terminals.
7. Extra output level available before the output clips after the input level has reached the 0
dB level. Thus the output will clip at +11 dBu.
4
Cautions
The output transistors do all have diode protection, but the outputs can still be
damaged if care is not taken. When a relay is disconnected while an output
transistor is on, and the relay has no diode directly connected to it, the relay will
generate a high voltage oscillation, arcing over the point where contact was
broken. This reverse voltage will flow back to the transistor and can damage it.
Audio Inputs
The audio receiver uses a differential line receiver IC for the balanced inputs. For
balanced inputs care must be taken to make sure the input impedance of the
driver and cable is balanced. Just a few ohms can degrade the common mode
rejection ratio considerably. If the inputs are driven by an unbalanced source, the
input must be connected to the HOT input, and the COLD input must be grounded
on the connector of the board.
The input must be balanced around the ground for best performance. If the board
and the source are both grounded, the audio cable ground can be disconnected
on the one end. Shielded twisted-pair cable is recommended for all applications.
The screen must still be connected on the other end. This will avoid ground loops.
All equipment must always be grounded to the safety ground of the building.
Follow industry practices for proper system grounding of the cables.
Input Levels
The LED display on the FDAT-TX Transmitter can be used to set the input levels.
At any moment, the input with the highest input level will be displayed. When the
0dB LED lit up, the input level is +4dBu. The input has another 7dB of headroom,
thus the signal will clip at +11dBu. For best audio performance the input level
must be kept as high as possible without clipping the signal. The lower the signal,
the lower the signal-to-noise ratio (SNR), and thus the higher the distortion. The
LED'S are for indication only, and must not be used for level measurement.
Outputs
The outputs are balanced, and impedance matched. The 2 outputs are both
driven out of phase. They are not floating like a transformer output. If an
unbalanced output is required, connect the ground to ground, and the signal to
the HOT output. Leave the COLD terminal open. This will however give half the
output level than a balanced output. The outputs can easily drive the large
capacitive loads associated with long audio cables.
Electrostatic Discharge
The inputs and outputs can be damaged by electrostatic discharge, thus care
must be taken when handling the boards. Failure to observe proper handling and
installation procedures can cause damage. Electrostatic Discharge damage can
range from performance degradation to complete hardware failure.
Physical Connection
PHOENIX Contact Connectors (Supplied with the DAPP-EN2)
The hardwired connections to the FDAT-EN2 are via sets of PHOENIX Contact
3.81 mm pitch connectors as shown in the following illustrations.

5
Physical Layout and Dimensions
FDAT-EN2
(All Dimensions in mm)
6
FDAT-EN2 +A
(All Dimensions in mm)

7
NOTES
Copyright © 2005Alf Electro-Technical Services CC. All rights reserved.