Dolby Laboratories DP503 User Manual
  1. Manuals
  2. Brands
  3. Dolby Laboratories Manuals
  4. Media Converter
  5. DP503
  6. User manual
Dolby Laboratories DP503 User Manual

Dolby Laboratories DP503 User Manual

Two channel ac-2/ac-3/mpeg digital audio encoder and dolby faxsystem
Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
Model DP503
Two Channel AC-2/AC-3/MPEG
Digital Audio Encoder and
Dolby Fax System
Users' Manual
MAIN

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the DP503 and is the answer not in the manual?

Questions and answers

Subscribe to Our Youtube Channel

Related Manuals for Dolby Laboratories DP503

Summary of Contents for Dolby Laboratories DP503

  • Page 1 Model DP503 Two Channel AC-2/AC-3/MPEG Digital Audio Encoder and Dolby Fax System Users' Manual MAIN...
  • Page 2 MAIN...
  • Page 3 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...
  • Page 4 MAIN...

  • Page 5: 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) ...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...
  • Page 6 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...
  • Page 7 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 MAIN...
  • Page 8 MAIN...

  • Page 9: Section 1 Introduction

    INTRODUCTION 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 the chosen data rate.

  • Page 10: Features

    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. Features...

  • Page 11: Available Algorithms, Data Rates And Sample Rates

    supported with this audio coding technique, and are summarized in the product brochure. Available Algorithms, Data Rates and Sample Rates Please refer to the product brochure packed with the unit for the most current information. MAIN...

  • Page 12: Regulatory Notices

    Regulatory Notices 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.
  • Page 13 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 observed: Ensure the voltage selector is set to the correct mains voltage for your supply.
  • Page 14 MAIN...

  • Page 15: 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 processes make them particularly appropriate for these applications.

  • Page 16: Satellite / Terrestrial Radio Communications

    (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.

  • Page 17: Section 2A Dolby Fax - An Overview

    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—...

  • Page 18: Quick Start For Equipment Installation

    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;...

  • Page 19: Quick Start For Isdn Setup

    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. Section 6.3 is devoted to ISDN Setup.

  • Page 20: Quick Start For Placing Dolby Fax Calls

    DP524 decoder unit will automatically configure itself for the proper algorithm. 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.

  • Page 21: Some Specific Applications

    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.
  • Page 22 Location X Picture (optional) Dolby Audio Source Applications Notes 2 Audio Channels from X to Y, Post production: (1 Audio Channel from Y to X for code/bi-phase). Soundtrack approval to picture Timecode Offset should be set to total path delay from Y to X to Y.
  • Page 23 Location X Picture Dolby Mic Amp/ Audio Mixer Applications Notes Post production: 2 Audio Channels from Y to X (1 used for code) 1 Audio Channel from X to Y. Dubbing to picture Incoming audio at Y should be recorded on a separate medium or one that will allow offset synchronisation on relevant tracks.

  • Page 24: Multi-Track Recording

    Location X Multi-track Recorder Dolby Audio Mixer Applications Notes 2 Audio Channels from X to Y, Music Recording: 2 Audio Channels from Y to X (1 used for code). Mono/Stereo multi-track overdubbing Timecode Offset is only required if the session is to run in sync at both X and Y.

  • Page 25: Section 3 Pre-Installation

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

  • Page 26: Internal Fuse

    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.

  • Page 27: Configuring Jumper Settings

    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: Be sure that the unit is NOT powered up.

  • Page 28: Clock Termination Jumper J12 [Terminated]

    Before installing the unit, be sure to verify that the switch positions are in their desired positions. Explanations follow below. Note: Unlike the DP524 decoder unit, on the DP503, the “off” position of the switch is in the UP position. [terminated] [open]...

  • Page 29: Switch Nos. 1-5 - Unit Address

    (Mode set by switch 6) 3.5.1 Switch nos. 1-5 - Unit Address A unique address can be assigned to each DP503 in a multi-unit installation for remote control applications using the RS-232 connector J108 Rem/Download. Individual units can be uniquely controlled using this feature.

  • Page 30: Switch No. 6 - Mode Of Operation: Normal/Download

    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.

  • Page 31: Section 4 Installation And Level Calibration

    32 kHz and 48 kHz. Note: To maintain better mechanical and electrical integrity, the rear panel connector on the DP503 is a BNC female connector rather than the typical phono jack normally encountered in S/PDIF installations.

  • Page 32: Data / Status / Control Connections

    4.3.1 Encoded Data Out and Timing Note If you are using the DP503 as part of a Dolby Fax system, substitute the information provided in Section 4.4 below. The data output connection occurs at the 37-pin D-connector J105 Encoded Data Out and Timing.

  • Page 33: Terminal Adapter Control

    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 parameters in Dolby Digital (AC-3).

  • Page 34: Calibration Procedure

    -3 dB reference tone, and adjust input levels for equal brightness of the LEDs. For 21 dB of headroom, supply a +3 dB reference tone. Dolby Fax Connections—Additional Procedures If you are using the DP503 as part of a Dolby Fax installation, please follow the additional procedures below. 4.6.1...

  • Page 35: Auxiliary Data

    ISDN unit is a unique cable with a 9-pin female connector on one end and telephone-style RJ-11 jack on the other. At the DP503, connect the 9-pin female end of the cable to J107 TA Ctrl. For the ISDN unit, connect the RJ-11 end of the cable to the RJ-11 connector labeled CONTROL..

  • Page 36: Isdn Connections

    (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...

  • Page 37: Section 5 Operation

    Appendix D. Introduction to the User Interface The DP503 interface provides the user with all the necessary functions for controlling the unit, and, in Dolby Fax applications, the ISDN unit. It consists of a front panel 16- character alphanumeric display with accompanying momentary push-button keys.
  • Page 38 The DIRectory 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.

  • Page 39: Operational Modes

    ESC, Places unit into ISDN Setup mode for Dolby Fax applications. See Section 5.3. When using the DP503 as part of a Dolby Fax system, invokes the ISDN terminal adapter Loopback function. If there is no call established, loopback is local.

  • Page 40: Encoder Configuration

    Algorithm Type = AC-2 Encoder Configuration Upon power-up, the DP503 will go through a self-test sequence. Two screens showing software revision levels will appear. Then, the default encoder configuration screen will be displayed; their corresponding labels are printed below the display. It will look...

  • Page 41: To Change Algorithm Type

    Use the screen above to change algorithm type, data rate, channel mode, sample rate, and auxiliary data rate (if any). Use the arrow keys to move back and forth among these parameters. Use the arrow keys to bring into view the available settings for each of the parameters.

  • Page 42: To Change Channel Mode

    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 5.2.3 To change Channel Mode...

  • Page 43: To Change Aux Rate (Auxiliary Data Rate)

    AC2 256 2C 48 12 Algorithm Data Channel Type Rate Mode Available sample rates: Label Sample Rate (kHz) 44.1 5.2.5 To change Aux Rate (auxiliary data rate) AC2 256 2C 48 12 Algorithm Data Channel Type Rate Mode Use the arrow keys to place cursor the first character of settings in the Aux Rate column.

  • Page 44: Isdn Setup (For Dolby Fax Applications Only)

    Before using a Dolby Fax system for the first time, it is necessary to go through the ISDN Setup procedure on the DP503 to correctly interface the ISDN unit to the phone company switch and to have the unit recognize the ISDN line(s). Since not all telephone companies have the same requirements for phone number entry, verify the proper method with the installer or sales person.

  • Page 45: To Choose Switch Type

    Once the ENTER key is depressed used, settings are stored in the DP503. However, they are not transmitted to the ISDN unit until the Update TA screen has been encountered (See Section 5.3.4 below).

  • Page 46: To Configure Line 1 (L1)

    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...
  • Page 47 Available characters: Label Label (space) PRI SPID1: _ Algorithm Data Type 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.

  • Page 48: To Configure Line 2 (L2), Line 3 (L3), Line 4 (L4)

    Type Rate If you select N, your settings will be stored in the DP503, but will not be communicated to the ISDN unit. You must resume the setup to completion at some later time in order to have a functioning Dolby Fax system.

  • Page 49: Using The Directory: Dolby Fax Applications

    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.

  • Page 50: Creating New Directory Entries

    EDITS? inquiry. Use the arrow and ENTER keys to make your choice. Choosing Y will return you to the default encoder parameters screen. Once the ENTER key is depressed, settings are stored in the DP503. 5.4.2 Creating New Directory Entries...
  • Page 51 You will then be presented with a screen that allows you to enter a name for the directory entry. NAME: _ Algorithm Data Channel Type Rate Mode Enter the name of your choice up to 13 characters in length. Use the arrow keys to scroll through available characters as shown in the table below.
  • Page 52 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: 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? Algorithm...
  • Page 53 EDIT ISDN? Algorithm Data Type Rate As usual, use the arrow keys and the ENTER key to choose Y. You will then see a screen similar to the following: BONDING-1 64 Algorithm Data Type Rate Use the arrow keys to scroll through available parameters as shown in the table below.

  • Page 54: Using The Copy Entry? Feature

    If you choose N, you will be presented with the following screen RE-EDIT? Algorithm Data Channel Type Rate Mode 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.

  • Page 55: Using Directory Entries

    To use an existing directory entry, use the arrow and ENTER keys to select USE from the above menu. Then use the directory entries. Select the desired entry with the ENTER key. The DP503 will then control the ISDN unit to initiate a call. You will initially see the following screen:...

  • Page 56: Editing Directory Entries

    Encoder-only parameters are designated with an asterisk (*) as the first character of the directory entry. Upon power-up, the DP503 will go through a self-test sequence. Two screens showing software revision levels will appear; then the default encoder configuration screen will be displayed.

  • Page 57: Entering Directory Mode

    Hence, to simplify operation, the DP503 directory system permits the directory entry to “inherit” the encoder parameters in effect prior to creating or editing entries. You may find it convenient, therefore, to choose encoder parameters before entering the directory menus.
  • Page 58 USE EDIT NEW DEL Algorithm Data Channel Type Rate Mode Begin by using the 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? Algorithm Data Channel...
  • Page 59 Available characters: The next step allows you to edit the encoder parameters EDIT CODEC? Algorithm Data Channel Type Rate Mode As usual, use the arrow keys and the ENTER key to make your selection. If you choose Y, you will be shown a facsimile of the default encoder screen, except that the space between parameters is in reverse video.

  • Page 60: Using The Copy Entry? Feature

    RE-EDIT? Algorithm Data Channel Type Rate Mode 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.

  • Page 61: Using Directory Entries

    5.5.3 Using Directory Entries USE EDIT NEW DEL Algorithm Data Channel Type Rate Mode To use an existing directory entry, use the arrow and ENTER keys to select USE from the above menu. Then use the existing directory entries. Select the desired entry with the ENTER key. The encoder parameters associated with the selected entry will take effect immediately.
  • Page 62 5-26 MAIN...
  • Page 63 5-27 MAIN...
  • Page 64 MAIN...
  • Page 65 INTERFACE SPECIFICATIONS AND DESCRIPTIONS DP503 Connector Pinouts A.1.1 Analog Audio Input, J101 & J102 XLR female connectors. Ch A Input, J101 Ch B Input, J102 A.1.2 AES/EBU Digital Audio Input, J103 XLR female connector. A.1.3 S/PDIF Digital Audio Input, J104 BNC female connector.
  • Page 66 A.1.4 Encoded Data Out and Timing, J105 DB-37 male connector. Connection Shield (chassis ground) SD + (send data +) ST + (send timing +) RS + (ready to send +) TR + (terminal ready +) TT + (terminal timing +) SG (signal ground) A.1.5 Aux/Acc RS-232 Port, J106...
  • Page 67 A.1.6 TA Ctrl RS-232 Port, J107 DB-9 male connector. Connection Ground A.1.7 Rem/Download RS-232 Port, J108 DB-9 female connector. Connection Ground A.1.8 Status, J109 DB-9 male connector. 5 V CMOS levels. Connection Fault Test Digital Input Lock Overload Ch A Overload Ch B Remote Ground...

  • Page 68: Rs-449 Interface Description

    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 specifications.

  • Page 69: Back-To-Back Testing

    The special cable connects the TT outputs of the DP503 directly to the ST inputs of the DP503, and to the RT inputs of the DP524. This cable also connects the SD outputs of the DP503 to the RD inputs of the DP524, and connects the signal grounds (SG) of the two units.
  • Page 70 MAIN...
  • Page 71 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.
  • Page 72 Regardless of the method used, while a file is being transferred to the DP503, messages will be displayed on the front panel display as well as on the PC. The messages will indicate that a module is loading, that the internal Flash EEPROM is being programmed, etc.
  • Page 73 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…” message is displayed before sending the next file.
  • Page 74 MAIN...

  • Page 75: Setup Menu Operation

    SETUP, DIR, and ESC lead to Confirm Update TA screen, and then, if confirmed, DIR leads to Dir Menu screen, SETUP and ESC return to Codec screen. If changes are pending, ESC leads to Confirm Esc screen, and then if "Y" to previous screen. DP503 USER INTERFACE STRUCTURE From Codec or...
  • Page 76 Directory Menu Operation - USE C A LL "C ALL ED T N E W D E L" G o to C odec screen = u se r interface screen O ther shape s = in ternal p ro gram fun ctions. W ithin shapes, text in quote s app ears on the LC D , other text idescribes fun ctionality.
  • Page 77 Directory Menu Operation - EDIT "CALL EDIT NEW DEL" = user interface screen Other shapes = internal program functions. W ithin shapes, text in quotes appears on the LCD, other text idescribes functionality. Outside of shapes, text in caps represents user selection of a displayed option, other text descibes program flow Except as indicated above or noted below:: ENTER completes operation and leads to next screen.
  • Page 78 Directory Menu Operation - NEW N E W "C A L L ED T N E W D EL " Sto re e n try a n d re in d e x d ire cto ry = u se r in te rfa ce scre e n O th e r sh a p e s = in te rn a l p ro g ra m fu n ctio n s.
  • Page 79 Directory Menu Operation - DEL "CALL EDT NEW DEL" = user interface screen Other shapes = internal program functions. Within shapes, text in quotes appears on the LCD, other text idescribes functionality. Outside of shapes, text in caps represents user selection of a displayed option, other text descibes program flow Except as indicated above or noted below:: ENTER completes operation and leads to next screen.
  • Page 80 MAIN...

  • Page 81: Ordering Isdn Service

    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 basic questions that arise when ordering ISDN service.

  • Page 82: Switch Types

    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...
  • Page 83 If your switch type is a Northern Telecom DMS-100, provide the following information to your phone company regarding the ISDN unit: Parameter Value Signaling Functional Protocol Version 1 or 2 Control (PVER) TEI Assignment Dynamic Maximum Number of Keys Release Key is N or a Key Number Ringing Indicator is Y/N...
  • Page 84 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 (Inter Exchange Carrier) or long distance carrier is chosen at this point.
  • Page 85 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 Bandwidth ON Demand INteroperability Group, which is an industry inverse multiplexing standard for dialing, establishing, maintaining, and terminating n x 56 and n x 64 kbps calls.
  • Page 86 256 kbps bitstream. Several different inverse multiplexing methods are available in the DP503, as shown in the following list, and are discussed individually below. AIM STATIC 64...

  • Page 87: Basic Rate Interface (Bri)

    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.
  • Page 88 Regional Bell Operating Company. 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 Terminal Adapter is a device or modem which connects to the ISDN lines.

Table of Contents

Save PDF