Dolby Laboratories DP503 manuale d’uso

Model DP503 Two Channel AC-2/AC-3/MPEG Digital Audio Encoder and Dolby Fax System Users' Manual MAIN[...]

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Users' Manual 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: 415-558-0200; Fax: 415-863-1373 www.dolby.com U.K. Wootton Bassett, Wiltshire SN4 8QJ Tel: 01793-842100; Fax: 01793-842101 W ARRANTY INFORMATION, USA: warran[...]

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TABLE OF CONTENTS SECTION 1 INTRODUCTION 1.1 Introduction ...............................................................................................1-1 1.2 Features......................................................................................................1-2 1.3 Dolby AC-2 and Dolby Digital (AC-3) ...................................[...]

ii SECTION 4 INSTALLATION and LEVEL CALIBRATION 4.1 Mounting ................................................................................................... 4-1 4.2 Audio Connections .................................................................................... 4-1 4.2.1 S/PDIF Input........................................................[...]

iii 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.[...]

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SECTION 1 INTRODUCTION 1.1 Introduction 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 th[...]

1-2 This manual includes installation procedures, descriptions of Model DP503 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 Dolby AC-2[...]

1-3 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. MAIN[...]

1-4 1.5 Regulatory Notices 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 [...]

1-5 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 must be observe[...]

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SECTION 2 APPLICATIONS The Dolby Model DP503 is suitable for a variety of point-to-point and point-to- 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 pr[...]

2-2 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, band- edge,[...]

SECTION 2A DOLBY FAX - AN OVERVIEW 2A.1 Introduction 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 addit[...]

2A-2 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[...]

2A-3 Installation involves: Equipment mounting Audio connections Data / Status / Control connections Using the “Y” cable to interconnect the DP503, DP524 and ISDN unit Applying power Analog audio calibration ISDN connections 2A.4 Quick Start for ISDN Setup Note: Refer to Section 5 for a comprehensive procedure and details on user interface. Sec[...]

2A-4 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 DIR. 2. Select USE . 3. Find the desired directo[...]

2A-5 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. ISDN Dolby Fax Dolby Fax Location X[...]

2A-6 ISDN Dolby Fax Dolby Fax Picture Picture (optional) Offset Location X Audio Timecode or bi-phase 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[...]

2A-7 ISDN Dolby Fax Dolby Fax Picture Picture Existing Audio Track Audio Mixer Location X Audio Timecode 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. This system allows off-line working: [...]

2A-8 ISDN Dolby Fax Dolby Fax Location X Audio Timecode Notes 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 fr[...]

SECTION 3 PRE-INSTALLATION 3.1 Unpacking 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[...]

3-2 With a small flat-blade screwdriver, open the fuse compartment door in the AC power input housing (see figure below). OPEN THE DOOR ACTIVE FUSE CARRIER (LOWER) FUSE 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[...]

3-3 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 [...]

3-4 3.4.1 Clock Termination Jumper J12 [terminated] As would be appropriate for most applications, the default condition for the Send Timing inputs on the data and clock connector is terminated (by means of a 150 ohm resistor). Certain situations may require that these inputs be unterminated (e.g., multiple inputs driven from a single output). This[...]

3-5 S101 Switch No. Function Up (Off) Down (On) 1 Unit Address (Binary Code) [0] 1 2 [0] 1 3 [0] 1 4 [0] 1 5 [0] 1 6 Normal/Download (Baud rate set by switches 7 & 8) [Normal] Download 7 Baud Rate for Remote [up] down 8 Control or Download Operation (Mode set by switch 6) [up] down 3.5.1 Switch nos. 1-5 - Unit Address A unique address can be as[...]

3-6 3.5.2 Switch no. 6 - Mode of Operation: Normal/Download The RS-232 port J108 Rem/Download can be used for 2 functions: upgrading of the audio coding algorithm software whenever upgrades are introduced, and remote control of the unit via a PC; in the latter instance upgrades can also be performed via the remote control host. Note: When invoking [...]

SECTION 4 INSTALLATION AND LEVEL CALIBRATION Note For Dolby Fax connections, see Section 4.4 below for additional information. An overview of the Dolby Fax system is provided in Section 2A. 4.1 Mounting The DP503 is designed for 19 inch rack mounting, but may be mounted in any plane and with any orientation. It occupies 1U (1 3/4") of space. W[...]

4-2 AES and IEC convention calls for XLR pin 2 to be “high/hot” and pin 3 to be “low/cold.” In the interests of maintaining international standardization, we suggest that the AES and IEC recommendations be followed. In an installation where the source is unbalanced, avoid ground loops by using two conductor shielded cable exactly as for bal[...]

4-3 4.3.3 Terminal Adapter Control This connection is used only in a Dolby Fax installation. See Section 4.5 below. 4.3.4 Remote Control If you wish to use a PC for remote control of the DP503, connect a standard 9-pin RS-232 serial cable (not supplied) to J108 Rem/Download . Remote control operation permits access to the setting of bitstream param[...]

4-4 The operating level for analog signals in the Model DP503 is referenced to -18dB relative to digital full scale; in other words, the DP503 allows for 18 dB of headroom. Analog input levels in the DP503 are adjustable by means of the rear panel gain controls Gain from -18 dBu to +6 dBu, where 0 dBu is defined as 0.775 Vrms. These controls should[...]

4-5 At the DP503, connect the end of the “Y” cable labeled “encoder” to J105 Encoded Data Out & Timing . At the DP524 digital audio decoder, furnished as part of the Dolby Fax system, connect the end of the “Y” cable labeled “decoder” to J103 Encoded Data In & Timing . At the ISDN unit, connect the remaining end of the “Y?[...]

4-6 console (or next piece of equipment) for the desired operating level. Refer to the manual supplied with the DP524 as necessary. Note:: The test tone level in both the DP503 encoder and DP524 decoder is referenced to -18dB relative to digital full scale. 4.6.10 ISDN Connections Attach the RJ-11 connectors for each of the ISDN lines used (1-4, ty[...]

SECTION 5 OPERATION Notes: See the front and rear view figures located at the end of this section. Flow charts illustrating the user interface structure are located in Appendix C. An overview of Dolby Fax principles is described in Section 2A. An ISDN ordering guide (for North America) can be found in Appendix D. 5.1 Introduction to the User Interf[...]

5-2 The DIR ectory key is used to access the directory functions of the DP503, which enable the creation, editing, deletion, and access to entries of frequently used encoder parameters as well as, in Dolby Fax applications, frequently dialed phone numbers with their associated ISDN parameters. The SHIFT key is used to access secondary functions ass[...]

5-3 SHIFT + ENTER Insert/Contrast During editing modes, inserts a space directly above the cursor and moves remaining text to the right. Function self-cancels after being invoked. Otherwise , invokes mode to enable adjustment of LCD screen contrast. Use Ç and È keys to adjust. Cancel by pressing ESC , SHIFT + DIR ISDN Setup Places unit into ISDN [...]

5-4 1. Algorithm Type Data Rate Channel Mode Aux Data Rate 2. Algorithm Type Sample Rate 3. Algorithm Type Data Rate ISDN parameters (in Dolby Fax applications) The setting of a particular parameter may therefore preclude the use of certain selections in lower levels of the hierarchy; those selections are eliminated from the list of available choic[...]

5-5 ª Use the screen above to change algorithm type, data rate, channel mode, sample rate, and auxiliary data rate (if any). Use the Å and Æ arrow keys to move back and forth among these parameters. Use the Ç and È arrow keys to bring into view the available settings for each of the parameters. Once the ENTER key or Å and Æ arrow keys are us[...]

5-6 Æ arrow key to both select the entry and move to the next parameter. Units are kbps (kilobits per second). Note: Available rates are dependent on the selected algorithm. Data rates displayed represent the total data rate. Available data rates: Display Display Display 040 096 224 048 112 256 056 128 320 064 160 384 080 192 448 5.2.3 To change C[...]

5-7 AC2 256 2C 48 12 Algorithm Data Channel Sample Aux Type Rate Mode Rate Rate Available sample rates: Label Sample Rate (kHz) 32 32 44 44.1 48 48 5.2.5 To change Aux Rate (auxiliary data rate) AC2 256 2C 48 12 Algorithm Data Channel Sample Aux Type Rate Mode Rate Rate Use the Å and Æ arrow keys to place cursor the first character of settings in[...]

5-8 5.3 ISDN Setup (for Dolby Fax applications only ) Note: An overview of Dolby Fax principles is described in Section 2A. Detailed ISDN ordering information (for North America) is described in Appendix D. Important: Be sure you have installed the complete Dolby Fax system per the previous section, including connection of the ISDN lines to the ISD[...]

5-9 ª Use the screen above to select the switch type used by the phone company (or to select the country of use) and to conform the ISDN unit to the ISDN lines in use. Use the Å and Æ arrow keys to move back and forth among the five available parameters. Use the ENTER key to descend into subsequent menus to fully configure the multiple entries n[...]

5-10 Note: The list of available countries continues to grow as the ISDN unit continues to gain government approvals. If your country is not listed, please contact Dolby Laboratories. 5.3.3 To configure Line 1 (L1) SW L1 L2 L3 L4 Algorithm Data Channel Sample Aux Type Rate Mode Rate Rate If you are not situated at this menu position, review the pre[...]

5-11 Available characters: Label Label (space) 6 07 18 29 30 4# 5* PRI SPID1: _ Algorithm Data Channel Sample Aux Type Rate Mode Rate Rate If required by your phone company’s switch, you will be prompted to enter the SPID number associated with the primary number. Use the arrow keys as before to enter the required digits. When you have finished e[...]

5-12 5.3.4 To configure Line 2 (L2), Line 3 (L3), Line 4 (L4) SW L1 L2 L3 L4 Algorithm Data Channel Sample Aux Type Rate Mode Rate Rate Phone number entry for remaining ISDN lines is identical to that of the first line. Note, however, that the designations for number and SPID will increment by successive digits to indicate the “line number.” Fo[...]

5-13 Note: If the ISDN unit is not powered up, if the ISDN line(s) are not connected to the ISDN unit, or if the control cable between the DP503 and ISDN unit is not connected, an error message “ TA NOT READY ” will be displayed. Rectify the problem and repeat the update procedure. 5.4 Using the DIRectory: Dolby Fax Applications The DP503 can s[...]

5-14 ª Use the screen above to USE an existing directory entry; EDIT an existing directory entry; create a NEW directory entry, or DEL ete an existing directory entry. Use the Å and Æ arrow keys to move back and forth among the five available parameters. Use the ENTER key to descend into subsequent menus to fully configure the multiple entries n[...]

5-15 You will then be presented with a screen that allows you to enter a name for the directory entry. NAME: _ Algorithm Data Channel Sample Aux Type Rate Mode Rate Rate Enter the name of your choice up to 13 characters in length. Use the Ç and È arrow keys to scroll through available characters as shown in the table below. While the cursor is bl[...]

5-16 to place the cursor to the next position. When you have finished entering the number, press ENTER to store the name; you will then proceed to the next screen. Available characters: 06 17 28 39 4* 5# SPACE Note: Spaces can be used to make the phone number more readable. The next step allows you to edit the encoder parameters EDIT CODEC? Y N Alg[...]

5-17 EDIT ISDN? Y N Algorithm Data Channel Sample Aux Type Rate Mode Rate Rate As usual, use the Å and Æ arrow keys and the ENTER key to choose Y . You will then see a screen similar to the following: ÇÈ BONDING-1 64 Algorithm Data Channel Sample Aux Type Rate Mode Rate Rate Use the Ç and È arrow keys to scroll through available parameters as[...]

5-18 If you choose N , you will be presented with the following screen RE-EDIT? Y N Algorithm Data Channel Sample Aux Type Rate Mode Rate Rate If you choose Y , you will have the opportunity to check your data entry, starting at the top of the directory entry screens. If you choose N , you will exit the data entry process without saving the entry, [...]

5-19 Continue with the remaining screens, using the arrow keys as appropriate to change only the parameters that you wish to change. 5.4.3 Using Directory Entries USE EDIT NEW DEL Algorithm Data Channel Sample Aux Type Rate Mode Rate Rate To use an existing directory entry, use the arrow and ENTER keys to select USE from the above menu. Then use th[...]

5-20 5.4.4 Editing Directory Entries USE EDIT NEW DEL Algorithm Data Channel Sample Aux Type Rate Mode Rate Rate To edit an existing directory entry, use the arrow and ENTER keys to select EDIT from the above menu. Then use the Ç and È arrow keys to scroll through your existing directory entries. Select the desired entry with the ENTER key. You w[...]

5-21 values displayed will depend on the previously defined state, if you or someone else have already saved a different encoder configuration. Tip: If you encounter the UPDATE TA? Y N screen, enter No by pressing the Æ arrow key so that the cursor is below the character N and then pressing ENTER . 5.5.1 Entering DIRectory Mode Hint: Whether using[...]

5-22 USE EDIT NEW DEL Algorithm Data Channel Sample Aux Type Rate Mode Rate Rate Begin by using the Å and Æ arrow keys to place the cursor on the first character of the designation NEW . Then press ENTER . You will then see the following screen: COPY ENTRY? Y N Algorithm Data Channel Sample Aux Type Rate Mode Rate Rate The purpose of the above sc[...]

5-23 Available characters: AI QY6 BJ RZ 7 CK S 0 8 D LT1 9 E M U 2 * (begin name with asterisk) F N V 3 SPACE GOW 4 HP X5 The next step allows you to edit the encoder parameters EDIT CODEC? Y N Algorithm Data Channel Sample Aux Type Rate Mode Rate Rate As usual, use the Å and Æ arrow keys and the ENTER key to make your selection. If you choose Y [...]

5-24 RE-EDIT? Y N Algorithm Data Channel Sample Aux Type Rate Mode Rate Rate If you choose Y , you will have the opportunity to check your data entry, starting at the top of the directory entry screens. If you choose N , you will exit the data entry process without saving the entry, and you will return to the first screen in the Directory mode. 5.5[...]

5-25 5.5.3 Using Directory Entries USE EDIT NEW DEL Algorithm Data Channel Sample Aux Type Rate Mode Rate Rate To use an existing directory entry, use the arrow and ENTER keys to select USE from the above menu. Then use the Ç and È arrow keys to scroll through your existing directory entries. Select the desired entry with the ENTER key. The encod[...]

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APPENDIX A INTERFACE SPECIFICATIONS AND DESCRIPTIONS A. 1 DP503 Connector Pinouts A.1.1 Analog Audio Input, J101 & J102 XLR female connectors. Ch A Input, J101 Pin Connection 1 Analog signal ground 2 Analog audio + 3 Analog audio - Ch B Input, J102 Pin Connection 1 Analog signal ground 2 Analog audio + 3 Analog audio - A.1.2 AES/EBU Digital Aud[...]

A-2 A.1.4 Encoded Data Out and Timing, J105 DB-37 male connector. Pin Connection Pin Connection 1 Shield (chassis ground) 2N C 2 0 N C 3N C 2 1 N C 4 SD + (send data +) 22 SD - (send data -) 5 ST + (send timing +) 23 ST - (send timing -) 6N C 2 4 N C 7 RS + (ready to send +) 25 RS - (ready to send -) 8N C 2 6 N C 9N C 2 7 N C 10 NC 28 NC 11 NC 29 N[...]

A-3 A.1.6 TA Ctrl RS-232 Port, J107 DB-9 male connector. Pin Connection Comments 1 DCD direct connection to DTR 2 RX asynchronous data in 3 TX asynchronous data out 4 DTR direct connection to DCD 5 Ground 6 DSR direct connection to RTS 7 RTS direct connection to DSR 8N C 9N C A.1.7 Rem/Download RS-232 Port, J108 DB-9 female connector. Pin Connectio[...]

A-4 A. 2 RS-449 Interface Description A.2.1 Functional Description The Dolby DP503 provides a standard RS-449 interface in the type DT mode (data and timing signals only, no handshakes) through a 37-pin female D-connector. RS-449 is the mechanical specification for a balanced (differential) transmission system meeting RS-422 and RS-423 electrical s[...]

A-5 A.2.3 Back-to-Back Testing For purposes of testing the Model DP503 and Model DP524 in a back-to-back configuration, a special cable must be constructed. Note that a DTE to DTE connection is not supported by the RS-449 specification; a standard 37-wire cable cannot be used to connect the units together. The special cable connects the TT outputs [...]

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APPENDIX B SOFTWARE DOWNLOADING PROCEDURE B.1 Introduction In the event that a software upgrade is required, the J108 Rem/Download port may be used to download the appropriate files and reprogram the Flash EEPROMs residing in the DP503. When this method of upgrade is desired, the necessary files will be supplied in IBM PC compatible format. B.2 Sof[...]

B-2 5. Download the required files from the PC using one of two methods: a) Use the utility SERLOAD.EXE or SERLOADN.EXE (the latter for use with Windows NT or Windows95 ) which are supplied with the upgrade files, by typing the command line: SERLOAD COM# BAUD FILENAME where COM# is the number of the PC serial port; BAUD is the baud rate from table [...]

B-3 the problem continues after repeating the download process, contact Dolby Laboratories. After displaying the “ UPDATE COMPLETE ” message for a few seconds, or in the event of an error, after displaying the error message, the DP503 will reset and enter Download mode again. If another file is to be loaded, make sure that the “ READY TO LOAD[...]

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APPENDIX C DP503 USER INTERFACE STRUCTURE C.1 Setup Menu Operation From Codec or Di r Sc reen * I S DN S E TUP SCREEN Select Swi tch Ty pe ** En able Li ne1? Edi t P RI NUM 1 Edit PRI SPI D 1 Edi t S EC NU M 1 Edit SEC SPI D 1 ** En able Li ne 2? Edi t P RI NUM 2 Edit PRI SPI D 2 Edi t S EC NU M 2 Edit SEC SPI D 2 ** En able Li ne 3? Edi t P RI NUM[...]

C-2 C.2 Directory Menu Operation - USE * "CALL EDT NEW DEL" W it hi n shapes , t ex t in quot es appear s on t he LCD , ot her t ex t i des cr i bes f unct i onali t y . Out si de of shapes , tex t i n caps r epres ent s user sel ect i on of a di spl ay ed opt i on, ot her t ex t des ci bes progr am flow Ex cept as i ndi cat ed abov e or [...]

C-3 C.3 Directory Menu Operation - EDIT * "CAL L ED IT NEW DEL" ** Ed it Site Name Duplic at e o r In va l id nam e? "DUPLI CATE NAME" o r "I NVALI D ENTRY " Se l e ct Site ye s Flash di splay EDI T " DI RECTO RY EMPTY " Flash di splay Directory em pty ? Other s hapes = i nternal program funct i on s. = u ser[...]

C-4 C.4 Directory Menu Operation - NEW * "CALL EDT NEW D EL" ** Edi t Si te Nam e no NEW "DI R FULL" Is D ir f u l l ? Fl as h di spl ay Dupli cat e or in va l id s ite nam e? no "D UP LICA TE NAME " or " I N V A L I D NAME " Fl as h di spl ay 5 tim e s ye s ye s "C O P Y EN TR Y? Y N " Select Si te[...]

C-5 C.5 Directory Menu Operation - DEL * "CALL ED T NEW DEL" N Sel e ct Site "D ELET E ENT RY?" DEL De l ete e nt ry and reindex direc tory Y = user i n terface s creen Other s hapes = i nt ernal program fu ncti ons . Within s hapes , tex t i n quotes appears on the LCD, other tex t ides cri bes functi onality . Outs ide o f sha[...]

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APPENDIX D ISDN ORDERING GUIDE (NORTH AMERICA) D.1 Introduction The following ISDN ordering guide is for Dolby Fax users ordering ISDN service for the Ascend Multiband VSX ISDN terminal adapters/inverse multiplexer (hereinafter referred to as the “ISDN unit”) that is used with the Dolby Fax system, and is intended to provide answers to the basi[...]

D-2 The information the phone company needs to give you is: The switch type that the ISDN circuits are connecting to at the CO (Central Office) and the ISDN phone numbers for each line, and whether the B channels are 56 or 64 kbps. D.2.1 Switch Types Certain switch types (there are only two manufacturers typically encountered in North America: Nort[...]

D-3 If your switch type is a Northern Telecom DMS-100, provide the following information to your phone company regarding the ISDN unit: Parameter Value Notes Signaling Functional Protocol Version Control (PVER) 1 or 2 A value of 1 is NTI custom. A value of 2 is National ISDN-1 (NI-1) and also requires a TID to be assigned as a suffix to a SPID. TEI[...]

D-4 B CHANNEL REQUIREMENTS Dolby Fax locations that have and call locations with 64 kbps B channels : Two ISDN BRI Lines are required. Dolby Fax locations that have and call locations with 56 kbps B channels : Three ISDN BRI lines are required. Also, an IXC ( I nter E xchange C arrier) or long distance carrier is chosen at this point. If the phone [...]

APPENDIX E GLOSSARY OF ISDN TERMS Basic Rate Interface (BRI) An ISDN interface that provides two 64 kbps digital B (Bearer) channels for voice or data and one 16 kbps signaling D (Delta) channel. Bonding B andwidth ON D emand IN teroperability G roup, which is an industry inverse multiplexing standard for dialing, establishing, maintaining, and ter[...]

E-2 Inverse Multiplexing Inverse Multiplexing is the process of distributing a high bandwidth bitstream (like the default Dolby Fax format which operates at 256 kbps using Dolby AC-2) onto multiple ISDN BRI-channels. The default Dolby Fax format requires the ISDN unit to split up the 256 kbps bitstream into four separate calls, each at 64 kbps. Ano[...]

E-3 BONDING-1 56 This version of inverse multiplexing is identical to BONDING-1 64 but is used when connecting to either 56 kbps ISDN or Switched 56 lines. AIM DELTA 56 AIM Delta is a version of inverse multiplexing which provides compatibility between 56 kbps and 64 kbps ISDN or Switched 56 lines. In a situation where a 64 kbps site calls a 56 kbp[...]

E-4 R egional B ell O perating C ompany. There are seven RBOCs, or local phone companies, throughout the U.S. that provide local telephone service and exchange calls with the IXCs (long distance carriers). Terminal Adapter (TA) The T erminal A dapter is a device or modem which connects to the ISDN lines. The TA formats the data into the correct for[...]