Dolby Laboratories DP503 User Manual

Model DP503

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Two Channel AC-2/AC-3/MPEG
Digital Audio Encoder and
Dolby Fax

Users' Manual

System

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Users' Manual

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For

Model DP503

Two Channel AC-2/AC-3/MPEG

Digital Audio Encoder

and

Dolby Fax System

Dolby Laboratories Incorporated

U.S.A. 100 Potrero Avenue, San Francisco, CA 94103

Tel: [phone]; Fax: [phone]

www.dolby.com

U.K. Wootton Bassett, Wiltshire SN4 8QJ

Tel: [phone]; Fax: [phone]

WARRANT Y INFORMATION, USA: warranty on the product covered by this manual is subject to the limitations and disclaimers
set forth in the warranty disclaimer originally shipped with the product and also printed on the back of the invoice.

All requests for repairs or information should include the unit serial number to assure rapid service.
Dolby, Dolby Fax, and the double-D symbol are registered trademarks of Dolby Laboratories Licensing Corporation.

Windows Windows NT and Window 95 are registered trademarks for Microsoft Corporation

©1997 Dolby Laboratories

ISSUE 1

S97/11336

Dolby Part No. 91451

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TABLE OF CONTENTS

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SECTION 1 INTRODUCTION

1.1 Introduction ...............................................................................................1-1

1.2 Features......................................................................................................1-2

1.3 Dolby AC-2 and Dolby Digital (AC-3).....................................................1-2

1.4 Available Algorithms, Data Rates and Sample Rates ...............................1-3

1.5 Regulatory Notices....................................................................................1-4

SECTION 2 APPLICATIONS

2.1 Telecommunications..................................................................................2-1

Dolby Fax............................................................................................2-1

2.2 Cable..........................................................................................................2-1

2.3 Satellite / Terrestrial Radio Communications ...........................................2-2

SECTION 2A DOLBY FAX - AN OVERVIEW

2A.1 Introduction ...............................................................................................2A-1

2A.2 Algorithms and Applications.....................................................................2A-1

2A.3 Quick Start for Equipment Installation......................................................2A-2

2A.4 Quick Start for ISDN Setup.......................................................................2A-3

2A.5 Quick Start for Developing a Phone Directory..........................................2A-3

2A.6 Quick Start for Placing Dolby Fax Calls...................................................2A-4

2A.7 Receiving Dolby Fax Calls........................................................................2A-4

2A.8 Some Specific Applications ......................................................................2A-5

SECTION 3 PRE-INSTALLATION

3.1 Unpacking..................................................................................................3-1

3.2 Inspection ..................................................................................................3-1

3.2.2 Claims for Shipping Damage ..................................................3-1

3.3 Fusing Information....................................................................................3-1

Main Fuse:...........................................................................................3-1

Internal Fuse........................................................................................3-2

3.4 Configuring Jumper Settings.....................................................................3-3

Removing the Top Cover ....................................................................3-3

3.4.1 Clock Termination Jumper J12 [terminated]...........................3-3

3.4.2 Analog Audio Input Termination J13/J14 [10k ohms] ...........3-3

3.4.3 Signal Ground-to-Chassis Link J15 [open].............................3-3

3.5 Configuring the Rear Panel DIP Switch S101...........................................3-4

3.5.1 Switch nos. 1-5 - Unit Address................................................3-4

3.5.2 Switch no. 6 - Mode of Operation: Normal/Download...........3-5

3.5.5 Switch nos. 7 & 8 - Baud Rate Set..........................................3-6

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SECTION 4 INSTALLATION and LEVEL CALIBRATION

4.1 Mounting...................................................................................................4-1

4.2 Audio Connections....................................................................................4-1

4.2.1 S/PDIF Input............................................................................4-1

4.2.2 AES/EBU Input.......................................................................4-1

4.2.3 Analog Input............................................................................4-1

4.3 Data / Status / Control Connections..........................................................4-2

4.3.1 Encoded Data Out and Timing................................................4-2

4.3.2 Auxiliary Data.........................................................................4-2

4.3.3 Terminal Adapter Control.......................................................4-3

4.3.4 Remote Control.......................................................................4-3

4.3.5 Status.......................................................................................4-3

4.4 Power.........................................................................................................4-3

4.5 Level Calibration (Analog Inputs).............................................................4-3

Calibration Procedure..........................................................................4-4

4.6 Dolby Fax Connections—Additional Procedures.....................................4-4

4.6.1 Mounting.................................................................................4-4

4.6.2 Audio Connections..................................................................4-4

4.6.3 Encoded Data Out and Timing................................................4-4

4.6.4 Auxiliary Data.........................................................................4-5

4.6.5 Terminal Adapter Control.......................................................4-5

4.6.6 Remote Control.......................................................................4-5

4.6.7 Status.......................................................................................4-5

4.6.8 Power.......................................................................................4-5

4.6.9 Level Calibration.....................................................................4-6

4.6.10 ISDN Connections...................................................................4-6

SECTION 5 OPERATION

5.1 Introduction to the User Interface..............................................................5-1

5.1.1 Push-button Key Description ..................................................5-1

5.1.2 Operational Modes..................................................................5-3

5.1.3 Operational Hierarchy.............................................................5-3

5.2 Encoder Configuration..............................................................................5-4

5.2.1 To change Algorithm Type .....................................................5-5

5.2.2 To change Data Rate ...............................................................5-5

5.2.3 To change Channel Mode........................................................5-6

5.2.4 To change Sample Rate...........................................................5-6

5.2.5 To change Aux Rate (auxiliary data rate)................................5-7

5.3 ISDN Setup (for Dolby Fax applications only).........................................5-8

5.3.1 Entering ISDN Setup Mode ....................................................5-8

5.3.2 To choose Switch Type...........................................................5-9

5.3.3 To configure Line 1 (L1).........................................................5-10

5.3.4 To configure Line 2 (L2), Line 3 (L3), Line 4 (L4) ................5-12

5.3.5 Concluding ISDN Setup..........................................................5-12

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5.4 Using the DIRectory: Dolby Fax Applications..........................................5-13

5.4.1 Entering DIRectory Mode .......................................................5-13

5.4.2 Creating New Directory Entries ..............................................5-14

5.4.2.1 Using the COPY ENTRY? Feature.............................5-18

5.4.3 Using Directory Entries...........................................................5-19

5.4.4 Editing Directory Entries.........................................................5-20

5.4.5 Deleting Directory Entries.......................................................5-20

5.5 Using the DIRectory: Encoder-only Applications.....................................5-20

5.5.1 Entering DIRectory Mode .......................................................5-21

5.5.2 Creating New Directory Entries ..............................................5-22

5.5.2.1 Using the COPY ENTRY? Feature.............................5-24

5.5.3 Using Directory Entries...........................................................5-25

5.5.4 Editing Directory Entries.........................................................5-25

5.5.5 Deleting Directory Entries.......................................................5-25

APPENDIX A INTERFACE SPECIFICATIONS AND DESCRIPTIONS

APPENDIX B SOFTWARE DOWNLOADING PROCEDURE

APPENDIX C DP503 USER INTERFACE STRUCTURE

APPENDIX D ISDN ORDERING GUIDE (North America)

APPENDIX E GLOSSARY OF ISDN TERMS

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1.1 Introduction

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The Dolby Model DP503 is a digital audio encoder supporting up to two channels
of Dolby AC-2, Dolby Digital (AC-3), and MPEG Layer-II digital audio coding
algorithms at data rates from 40 kbps to 448 kbps. Single channel, dual channel,
and joint stereo configurations are selectively available, depending on the chosen
data rate. A front panel menu and directory system provides convenient access to
the desired operating modes and to recall frequently used encoder settings.

This front panel user interface is also able to control an ISDN terminal
adapter/inverse multiplexer when combined with other equipment as part of a
Dolby Fax installation. The result is a flexible, multi-unit solution for real-time,
high-quality digital audio transmission on ISDN that does not require a computer,
terminal, or palmtop unit for its control. The built-in directory system, in Dolby
Fax applications, also stores ISDN settings and frequently dialed phone numbers.

SECTION 1

INTRODUCTION

For the ultimate in flexibility, the DP503 can be remotely controlled via a Windows
based PC for use as a stand-alone encoder or as part of a Dolby Fax system.

Both digital (AES/EBU and S/PDIF) and analog audio inputs are provided. Analog
to digital conversion is performed at 18 bit resolution. Digital inputs include a
built-in sample rate converter.

The encoder will operate in synchronization with an externally provided clock or
from its own internal time base reference. Once converted to a digital data stream
(at an internal sampling rate of 32, 44.1 or 48 kHz), the 18-bit PCM serial input
data representing both audio channels is processed using the selected algorithm and
formatted into a single serial output data stream at the selected bit rate. An
industry-standard RS-449/422 data connection simplifies incorporation into a
variety of digital communications systems, including the Dolby Fax system for real
time transmission over ISDN.

RS-232 ports are provided for remote control via a PC; software download
capability for field-upgrade of the algorithm software; auxiliary data input; and
ISDN terminal adapter/inverse multiplexer control.

The encoder provides front panel system status indicators as well as a rear-panel
connector with TTL logic levels for remote status monitoring. A digitally generated
test signal is provided for system alignment and troubleshooting and can be
activated from the front panel or via a remote control.





-

Rear panel analog input trimmers are provided, along with calibration LEDs on
both the front and rear panels. Front panel overload LEDs are also provided.

This manual includes installation procedures, descriptions of Model DP503

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operation, installation details, and interface specifications.

The complementary DP524 decoder unit features automatic algorithm detection to
provide foolproof operation in conjunction with the DP503. The DP524 is provided
with its own user manual.

1.2 Features

1-2

x

x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x

Dolby AC-2, Dolby Digital (AC-3), and MPEG Layer-II audio
coding algorithms from 40 kbps - 448 kbps
Mono, dual-mono, or joint stereo modes
Algorithm operation at 32, 44.1, 48 kHz sampling rates

*

*

*

Analog inputs with 18-bit A/D converters
Digital inputs (AES/EBU and S/PDIF)
Built-in sample rate converter and selectable internal sample rate
Selectable auxiliary data rates (0 - 9.6 kbps)

*

*

RS-449 data interface (EIA-530, V.35, and X.21 compatible)
Internal or external clock reference
RS-232 port for auxiliary data
RS-232 port for remote control via PC
RS-232 port for telco control (terminal adapter/inverse multiplexer)
Download capability for software upgrades
Front panel user interface with alphanumeric display
Ideal for use in a Dolby Fax system
Built-in test tone generator
Status indicators with rear-panel logic tallies

*

Certain restrictions apply. See product brochure.

1.3 Dolby AC-2 and Dolby Digital (AC-3)

Dolby AC-2 combines spectrum-efficient data compression with professional­quality audio performance. Two-channel modes excel at conveying different
material such as audio and time code or separate language programming.

Despite the low, spectrum-efficient data rate, Dolby Digital yields very high audio
quality and is suitable for the most demanding of professional and consumer
distribution applications. First demonstrated to the film industry in May of 1991,
Dolby Digital audio coding technology has evolved into a very sophisticated and
flexible system for the digital representation of high quality sound. Dual channel
implementations of the Dolby Digital algorithm can be user-configured to operate
in dual mono or joint stereo modes.

Both the Dolby AC-2 and Dolby Digital algorithms are compatible with Dolby
Matrix Surround decoding. A wide range of bit rates and audio coding modes are

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supported with this audio coding technique, and are summarized in the product
brochure.

1.4 Available Algorithms, Data Rates and Sample Rates

Please refer to the product brochure packed with the unit for the most current
information.

1.5 Regulatory Notices

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FCC

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 this
instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at his
or her own expense.

1-4

UL

Troubleshooting must be performed by trained technicians. Do not attempt to
service this equipment unless you are qualified to do so.

WARNING:

Check that the correct fuses have been installed. To reduce the risk

of fire, replace the fuses only with the same type and rating. See manual Section

3.3 for detailed fusing information.

Exposed portions of the power supply are electrically "hot". In order to reduce the
risk of electrical shock, the power cord MUST be disconnected when the cover of
this equipment is removed.

UK

Connections for the United Kingdom:

WARNING: THIS APPARATUS MUST BE EARTHED

As the colours of the cores in the mains lead may not correspond with the coloured
markings identifying the terminals in your plug, proceed as follows:

x

The core which is coloured green and yellow must be con nected t o the terminal in th e
plug which is marked with the letter E or by the earth symbol
green and yellow.

The core which is coloured b lue must be co nnected to th e terminal which is marked

x

with the letter N or coloured black.
The core which is coloured b rown must be con nected t o the t erminal which is marked

x

with the letter L or coloured red.

or coloured green o r

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IEC NOTICES

This unit complies with the EMC requirements of of EN55103-1 and EN 55103-2 when installed in an E2
environment in accordance with this manual.

IMPORTANT SAFETY NOTICE

This unit complies with the safety standard IEC65. To ensure safe operation and to guard
against potential shock hazard or risk of fire, the following
o Ensure the
o Ensure
o The unit
o The

Ce materiel est conforme à la norme IEC65. Pour vous assurer d'un fonctionnement sans danger et de prévenir
tout choc électrique ou tout risque d'incendie, veillez à observer les recommandations suivantes.
o Le selecteur de tension doit être placé sur la valeur correspondante à votre alimentation réseau.
o Les fusibles doivent correspondre à la valeur indiquée sur le materiel.
o Le materiel doit être correctement relié à la terre.
o Le cordon secteur livré avec le materiel doit être cablé de la manière suivante:

Dieses Gerät entspricht der Sicherheitsnorm IEC65. Für das sichere Funktionieren des Gerätes und zur
Unfallverhütung (elektrischer Schlag, Feuer) sind die folgenden Regeln unbedingt einzuhalten:
o Der Spannungswähler muß auf Ihre Netzspannung eingestellt sein.
o Die Sicherungen müssen in Type und Stromwert mit den Angaben auf dem Gerät übereinstimmen.
o Die Erdung des Gerätes muß über eine geerdete Steckdose gewährleistet sein.
o Das mitgelieferte Netzkabel muß wie folgt verdrahtet werden:

Questa apparecchiatura è stata costruita in accordo alle norme di sicurezza IEC 65. Per una perfetta
sicurezza ed al fine di evitare eventuali rischi di scossa êlettrica o d'incendio vanno osservate le
seguenti misure di sicurezza:
o Assicurarsi che il selettore di cambio tensione sia posizionato sul valore corretto.
o Assicurarsi che la portata ed il tipo di fusibili siano quelli prescritti dalla casa costruttrice.
o L'apparecchiatura deve avere un collegamento di messa a terra ben eseguito; anche la connessione rete deve

avere un collegamento a terra.

o Il cavo di alimentazione a corredo dell'apparecchiatura deve essere collegato come segue:

Esta unidad cumple con la norma de seguridad IEC65. Para asegurarse un funcionamiento
seguro y prevenir cualquier posible peligro de descarga o riesgo de incendio, se han de observar
las siguientes precauciones:
o Asegúrese que el selector de tensión esté ajustado a la tensión correcta para su alimentación.
o Asegúrese que los fusibles colocados son del tipo y valor correctos, tal como se marca en la unidad.
o La unidad debe ser puesta a tierra, conectándola a un conector de red correctamente cableado y puesto a tierra.
o El cable de red suministrado con esta unidad, debe ser cableado como sigue:

Denna enhet uppfyller säkerhetsstandard IEC65. För att garantera säkerheten och gardera mot
eventuell elchock eller brandrisk, måste följande observeras:
o Kontrollera att spänningsväljaren är inställd på korrekt nätspänning.
o Konrollera att säkringarna är av rätt typ och för rätt strömstyrka så som anvisningarna på enheten föreskriver.
o Enheten måste vara jordad genom anslutning till ett korrekt kopplat och jordat el-uttag.
o El-sladden som medföljer denna enhet måste kopplas enligt foljande:

Deze unit voldoet aan de IEC65 veiligheids-standaards. Voor een veilig gebruik en om het gevaar van electrische
schokken en het risico van brand te vermijden, dienen de volgende regels in acht te worden genomen:
o Controleer of de spanningscaroussel op het juiste Voltage staat.
o Gebruik alleen zekeringen van de aangegeven typen en waarden.
o Aansluiting van de unit alleen aan een geaarde wandcontactdoos.
o De netkabel die met de unit wordt geleverd, moet als volgt worden aangesloten:

voltage selector

fuses

fitted are the

must be earthed

power cord

is set to the correct mains voltage for your

correct rating and type

by connecting to a correctly wired and

supplied with this unit must be wired as follows:

Live—Brown Neutral—Blue Earth—Green/Yellow

IMPORTANT – NOTE DE SECURITE

Phase—Brun Neutre—Bleu Terre—Vert/Jaune

WICHTIGER SICHERHEITSHINWEIS

Phase—braun Nulleiter—blau Erde—grün/gelb

NORME DI SICUREZZA – IMPORTANTE

Filo tensione—Marrone Neutro—Blu Massa—Verde/Giallo

AVISO IMPORTANTE DE SEGURIDAD

Vivo—Marrón Neutro—Azul Tierra—Verde/Amarillo

VIKTIGA SÄKERHETSÅTGÄRDER!

Fas—Brun Neutral—Blå Jord—Grön/Gul

BELANGRIJK VEILIGHEIDS-VOORSCHRIFT:

Fase—Bruin Nul—Blauw Aarde—Groen/Geel

must

be observed:

as marked on the unit.

supply

earthed

.

power outlet.

GB

F

D

I

E

S

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The Dolby Model DP503 is suitable for a variety of point-to-point and point-to-

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multipoint digital transmission applications, including cable, telecommunications,
and satellite or terrestrial microwave links. The very high audio quality and low,
spectrum-efficient data rates of the Dolby AC-2 or Dolby Digital (AC-3) coding
processes make them particularly appropriate for these applications. The inclusion
of MPEG algorithms provides further flexibility and compatibility with MPEG
installations.

The complementary DP524 decoder unit features automatic algorithm detection to
provide foolproof operation in conjunction with the DP503.

2.1 Telecommunications

The Model DP503 can be used with T1 or ISDN lines for point-to-point
communications. Film and recording studios, as well as mastering facilities, can be
interconnected with audio and control data to enable multi-site, real-time
operations. Broadcast applications include STL, ICR, and backhaul operations.

SECTION 2

APPLICATIONS

On T1 networks, only a small portion of the T1 bit stream is used; the residual
capacity remains available for additional audio channels or other services (e.g.,
voice or computer data). Otherwise, fractional service can be ordered. In ISDN
applications, the number of "B" channels needed is determined by the chosen bit
rate.

Dolby Fax

The DP503 is particularly suited to the Dolby Fax system, which provides the
highest quality real time digital audio transmission over ISDN phone circuits.
Originally limited to the Dolby AC-2 audio coding algorithm, the additional
capabilities of the DP503 in incorporating Dolby Digital (AC-3) and MPEG Layer­II algorithms expands the applications possibilities, including operation at lower
data rates (hence, fewer ISDN lines) and interoperability with other ISDN
telecommunications hardware platforms.

Dolby Fax now permits contribution audio at the highest quality consistent with the
application and budget constraints. Voiceover work may be an application where
the ultimate in quality can be sacrificed for a savings in data rate; conversely,
playback for quality control purposes or mix approvals would dictate higher
quality. More information can be found in Section 2A and in the Appendices.

2.2 Cable

Whether for audio-only services or for an enhanced digital audio service
accompanying video, the DP503 is ideally suited to cable applications. The
availability of low data rates permits efficient use of cable bandwidth as either a
baseband signal or as a subcarrier above video.

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Decoder circuitry can be readily incorporated into set-top decoder hardware, or
integrated directly into consumer receiver equipment.

2.3 Satellite / Terrestrial Radio Communications

With suitable digital modulation equipment, the Model DP503 can be used for
various satellite broadcast/distribution applications including subcarrier, band­edge, and SCPC schemes. It can also provide the basis for a spectrum-efficient
terrestrial radio system (e.g., STL, backhaul, or inter-city relay), either as an audio
link or as part of a combined video/audio link. For these applications, a digital
modem that can accept an RS-449/422 data connection is required. The DP503 can
be used successfully with the BPSK or QPSK digital modulation techniques typical
in the satellite industry, and with any degree of forward error correction (FEC)
desired. Given the variety of available data rates, users are free to determine the
tradeoffs between audio quality, bandwidth, cost, spectrum-efficiency, power, and
robustness in determining their transmission parameters.

2A.1 Introduction

MAIN

The Dolby Fax system allows high quality audio to be sent over ISDN telephone
lines. With a complete encode/decode system, communication is full duplex; i.e.
two high quality audio channels can be sent in both directions at the same time.
Time code can also be sent down an audio channel. An additional auxiliary channel
can be used for signaling and data at 1200 baud. Where bi-directional two-channel
audio and synchronization is required, additional equipment can be used to send
and receive time code via the auxiliary data channel.

Audio inputs to the Dolby Fax are both analog and digital. The signal is converted
to PCM in the Dolby Model DP503 encoder. Three different audio coding
methods—Dolby AC-2 (the de facto standard in film and music) as well as the
Dolby Digital (AC-3) and MPEG Layer II— audio coding is used to reduce the bit
rate of the digital audio to a single bit stream of 56-384 kbps, incorporating 1 or 2
audio channels and the auxiliary data. This bit stream is sent to the ISDN terminal
adapter/inverse multiplexer unit, which interfaces with the public telephone
network, executes dialing, and handles differing call configurations between
countries. If needed, the digital data stream is divided up (inverse multiplexed) and
sent over several phone calls and is reassembled correctly at the destination. The
Dolby Model DP524 decoder converts the bit stream to audio and subsequently
feeds both analog and digital outputs.

SECTION 2A

DOLBY FAX - AN OVERVIEW

2A.2 Algorithms and Applications

The Dolby Fax system has built its reputation as being the de facto standard for
high quality audio using Dolby AC-2. With this reputation, a worldwide network
has been created which includes recording studios, film dubbing stages, record
labels, video post houses and home studios.

One of the most important new features of the Dolby Fax system is its ability to
connect to MPEG codecs, providing compatibility with users outside of the Dolby
Fax network of studios. Now with this addition, you have access to locations
whose work typically includes voice-over and jingle work.

To remain compatible with the existing network of Dolby Fax locations using
Dolby AC-2, two BRI lines—each with two 64 kb B channels—are needed for two
channels of "CD quality" 20 kHz audio. Dolby Fax with AC-2 can also operate at
384 kbps in situations where low coding delay is required. In this format, 3 BRI
lines are required at each location

MPEG locations, using codecs from companies such as Telos, Musicam USA
(formerly CCS) and RE typically operate at 56/112 kbps or 64/128 kbps for voice
over sessions and broadcast remotes. Switched 56 is used for 56/112 type calls,
while ISDN is used for 64/128 sessions. Calls at 56/64 kbps provide a 7-10 kHz

2A-2

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audio bandwidth while 112/128 kbps calls provide 15-20 kHz audio bandwidth.
The 112/128 calls combine or "inverse multiplex" the two switched 56 or 64 kbps
ISDN B channels together to provide a higher bandwidth transmission path. Sites
that conform to the international inverse multiplexing standard Bonding Mode 1
can be accessed with your Dolby Fax system. Refer to the glossary in Appendix E
for more information on inverse multiplexing.

The DP503 also offers Dolby Digital (Dolby AC-3) in mono, stereo and joint
stereo modes with data rates ranging from 56-384 kbps. With this range of data
rates and their associated audio bandwidths, you can determine the tradeoff you
would like to make in terms of audio quality and call cost; this flexibility is
available when connecting to other Dolby Fax users with the DP503/DP524 codec
equipment. Dolby Digital (Dolby AC-3) is the same technology used in the Dolby
Digital film format, the DVD, US Advanced Television, as well as cable radio and
satellite audio services.

2 Chnls
Audio +
Data

2 Chnls
Audio +
Data

Dolby Fax - Send and Receive system

DP503
Encoder

DP524
Decoder

256
kbit/s

256
kbit/s

ISDN TA/
Imux

ISDN

ISDN TA/
Imux

Dolby Fax - Send and Receive system

Fig 1. Dolby Fax Sample Block Diagram

2A.3 Quick Start for Equipment Installation

Note

:

Refer to Sections 4 and 5 for comprehensive information.

Pre-Installation involves:

x

Unpacking

x

Inspection for damage

x

Checking fusing

x

Configuring internal jumpers (DP503 & DP524)

x

Configuring rear panel switches (DP503 & DP524)

x

Mounting rack ears (ISDN unit)

256
kbit/s

256
kbit/s

DP524
Decoder

DP503
Encoder

2 Chnls
Audio +
Data

2 Chnls
Audio +
Data

2A-3

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Installation involves:

x

Equipment mounting

x

Audio connections

x

Data / Status / Control connections

Using the “Y” cable to interconnect the DP503, DP524 and ISDN unit

x

Applying power

x

Analog audio calibration

x

ISDN connections

2A.4 Quick Start for ISDN Setup

Note:

devoted to ISDN Setup. Refer also to Appendices D & E for ISDN background information.

Refer to Section 5 for a comprehensive procedure and details on user interface. Section 6.3 is

1. Select ISDN Setup by pressing SHIFT + DIR

2. Pick the appropriate switch type under the menu heading SW.

3. Enter your phone numbers (and SPIDs, if needed) under the menu headings

L1, L2, L3, L4 as needed (typical Dolby Fax installations use only 2 lines,
so only L1 and L2 will be used.). Leave unused lines disabled.

4. Store ISDN settings by pressing the ESC key and answering Y to the
UPDATE TA? inquiry.

5. Reset the ISDN unit by cycling mains power.

2A.5 Quick Start for Developing a Phone Directory

Notes:

Do

6.4.2)

Refer to Section 5.4 for a comprehensive procedure on entering directory items.

not

begin a Dolby Fax directory entry with an asterisk, as that signifies an encoder-only entry (See Section

1. Press DIR.

2. Select NEW. Use COPY ENTRY if modeling a new entry from an
existing one.

3. Enter required information. Be sure that encoder and ISDN unit parameters
match the capabilities of the site you will be calling. Default Dolby Fax
entries are:

2A-4

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Parameter Value

Algorithm Type AC-2
Data Rate 256
Channel Mode 2C
Sample Rate 48
Aux Rate 12
ISDN (Inverse Multiplexing type) BONDING-1 64

4. Save the directory entry.

2A.6 Quick Start for Placing Dolby Fax Calls

Note

Refer to Section 5.4.3 for a comprehensive procedure on making calls.

1. Press

2. Select

DIR.

USE

.

3. Find the desired directory listing by scrolling with the ÇÈ keys.

4. Press ENTER. The call will be initiated. Look for ÆÆLOCATION on

the display to confirm that the call is established.

Hint:

extinguish.

You will also see the

Lock

LED on the DP524 become green, and the

5. Remember to Hang Up by pressing Shift + È or ESC. Select Y to

confirm.

2A.7 Receiving Dolby Fax Calls

Call setup is automatic: The ISDN unit will automatically answer an incoming call,
and the DP524 decoder unit will automatically configure itself for the proper
algorithm.

Mute

LED on the DP524

But, your DP503 encoder must be manually set to match the incoming call:

1. With the DP503 in the default encoder parameters screen, make
adjustments to the encoder, if necessary, to match the incoming algorithm,
data rate, channel mode, sample rate, and aux rate.

Note:

Refer to Section 5.2 for a comprehensive procedure on changing encoder parameters.

2A-5

MAIN

2A.8 Some Specific Applications

Several applications are shown here. This is not an exhaustive list, neither is it the
only way to set up each application. They do however illustrate clearly the
principles and the issues that require consideration, particularly with regard to real
time audio synchronization.

Location X

Audio
Source

Applications

Music Recording:
Checking tracks/mixes
direct from the studio
Listening to demos

Post production:
Auditioning voices
Sending/receiving track
elements

Radio:
Sending/receiving jingles

Location Y

A

Dolby
Fax

B

Notes
2 Audio Channels from X to Y.
As both channels are independent, Dolby Stereo and

Dolby Surround Lt Rt tracks can be sent with the
Dolby Fax.

ISDN

A
Dolby
Fax

B

Key

Audio

Timecode

Stereo Playback

2A-6

MAIN

Location X

Picture
(optional)

Audio
Source

Applications

Post production:
Soundtrack approval
to picture

Location Y

Offset

A

A

Dolby
Fax

B

Notes
2 Audio Channels from X to Y,

(1 Audio Channel from Y to X for code/bi-phase).
Timecode Offset should be set to total path delay

from Y to X to Y. This can be measured by
sending timecode from Y and looping it back via
X, so the offset can be read.

Where the picture is on film, bi-phase can be used
for synchronisation instead of time code by using
an external bi-phase to timecode generator.

ISDN

AA
Dolby
Fax

B

Picture

Key

Audio

Timecode
or bi-phase

As both channels are independent, Dolby Stereo and
Dolby Surround Lt Rt tracks can be sent with the
Dolby Fax. In this case they can be decoded to LCRS
at Location Y.

Soundtrack Approval

2A-7

MAIN

Location X

Mic

Applications

Post production:
Dubbing to picture

AA

Dolby

B

Fax

A

Mic Amp/
Audio Mixer

Notes
2 Audio Channels from Y to X (1 used for code)

1 Audio Channel from X to Y.
Incoming audio at Y should be recorded on a

separate medium or one that will allow offset
synchronisation on relevant tracks.

ISDN

Dolby
Fax

A

+ Talkback

B

Location Y

PicturePicture

Existing
Audio Track

Audio
Mixer

Key

Audio

Timecode

This system allows off-line working: send
Existing Audio Track and code to location X,
record tracks to tape/film and send finished
audio back to Y by Dolby Fax or Courier.

Dubbing Sound to Picture

2A-8

MAIN

Mic
Mic

Applications

Location X

Multi-track
Recorder

Audio
Mixer

Notes

Dolby
Fax

B

A

Location Y

Timecode
Offset

A

ISDN

B

A
Dolby
Fax

A

B

B

Multi-track
Mix

Audio
Delay

Key

Multi-track
Recorder

Audio
Mixer

Music Recording:
Mono/Stereo multi-track
overdubbing

Radio:
Mono/two channel
voice/overs

2 Audio Channels from X to Y,
2 Audio Channels from Y to X (1 used for code).

Timecode Offset is only required if the session
is to run in sync at both X and Y.

Timecode Offset and Audio Delay should be set
to total path delay from X to Y to X. This can be
measured by sending timecode from Y and
looping it back via X, so the offset can be read.

Incoming audio at Y should be recorded on a
separate medium or one that will allow offset
synchronisation on relevant tracks.

Recording audio at location X is optional.
This system allows off-line working: send

foldback and code to location X, record tracks
to tape and send finished audio back to Y by
Dolby Fax or Courier.

Multi-track Recording

Audio

Timecode

3.1 Unpacking

MAIN

Before proceeding further, be sure to inspect the outer carton for shipping damage.
If there has been any penetration to the carton, be sure to inspect the unit for any
physical damage in those areas.

Several accessories have been provided in the packet provided with this manual.
Please compare them with the following list to ensure that there are no missing
items:

Rack screws and washers
Power cord
Spare fuse 1A
Spare fuse, 2A, used on the internal power supply
Warranty card
Registration card, Pro Products
Hex wrench (for access to inside of unit)
Alignment tool (“tweaker”)
Product brochure with specifications

(Part. No. 56016)

(Part No. 91292)

or variant

(Part No. 91155)

SECTION 3

PRE-INSTALLATION

(Part No. 56017)

or variant

3.2 Inspection

Carefully remove the unit from its carton. Remove the plastic wrapping and place
on a flat surface.

If there are no signs of physical damage, proceed to "Fusing Information" below.

3.2.2 Claims for Shipping Damage

If, in your inspection procedure, you should find physical damage, please notify the
carrier immediately. All claims for damage must be filed by the recipient. Dolby
Laboratories or your dealer/distributor will be happy to assist where possible.

3.3 Fusing Information

WARNING:

The DP503 utilizes a universal switching power supply that can accommodate the
full range of nominal voltages between 90 Vac and 264 Vac and any frequency
between 50 Hz and 60 Hz.

To reduce the risk of fire, replace fuses only with the same type and rating.

Main Fuse:

Use 1 Amp, 250V, 20 mm, Time-Lag fuse.

3-2

MAIN

With a small flat-blade screwdriver, open the fuse compartment door in the AC
power input housing (see figure below).

OPEN THE

DOOR

FUSE

ACTIVE

FUSE CARRIER

(LOWER)

Check that the fuse in the active (lower) fuse carrier is of the correct rating. A spare
fuse can be stored in the upper fuse carrier position.

Snap the fuse compartment door closed.

Internal Fuse

The switching power supply contains a separate fuse. Most fault conditions should
be protected by the main fuse. The internal fuse rating is:

2 Amp, 250V, 20 mm, fast-blow.

3-3

MAIN

3.4 Configuring Jumper Settings

The Model DP503 includes certain user-selectable options that are configured by
means of internal jumpers, as shown below. Their default settings (shipped with
the unit) are shown in the figure. Any jumpers not specifically mentioned are for
factory use only and should not be disturbed.

Removing the Top Cover

If you need to gain access to the interior of the DP503 to change these jumpers,
remove the top cover of the unit as follows:

WARNING:

not be connected.

Be sure that the unit is NOT powered up. As there is no power switch, the power cord must

Using the supplied hex wrench, remove the 12 screws securing the top
cover to the chassis; there are three screws on the upper front panel, upper
rear panel, and each of the sides. The three washerless screws should be
reserved for affixing at the top of the front panel when re-assembling the
unit.

Note:

front panel. These do

The front panel is attached to the chassis by means of 3 screws at the lower portion of the

not

need to be disturbed in order to remove the top cover.

Gently lift the top cover upward and towards the rear. Carefully set aside.

Reverse the above procedure when re-assembling the unit.

J13 J14

600

10K

ChB ChA

Audio input
termination

600

10K

S101

Signal ground to
chassis ground link

LINKED

OPEN

J14

J12

ST input clock
termination (150 ohm)

TERMINATED

NOT TERMINATED

DP503 MOTHERBOARD