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DIVA T/A ISDN Modem
Reference Guide
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Eight Edition (July 1999) 206-193-08 DIVA T/A ISDN Modem is a trademark of Eicon Technology Corporation. Microsoft, Windows, and Windows NT are registered trademarks of Microsoft Corporation. CompuServe is a registered trademark of CompuServe Incorporated. Hayes is a registered trademark of Hayes Microcomputer Products, Inc. Changes are periodically made to the information herein; these changes will be incorporated into new editions of the publication. Eicon Technology may ma
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Contents What is ISDN? ......................................................................................................................... 4 ISDN Communication Channels ............................................................................................................... 6 Connecting to ISDN - BRI and PRI ............................................................................................................ 8 What is Multilink PPP? ............................................
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What is ISDN? While you've heard of ISDN, there's a good chance you're unsure whether you need it - or even what, exactly, it is. Even though ISDN is globally available, it's so new that understanding it may require a little investigation. In simple terms, ISDN is a replacement for plain old telephone service, which was never designed to meet the needs of the information age. ISDN uses the same wiring that currently serves homes and businesses. You get ISDN service from the same companies w
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What is ISDN? Telecommuters, for example, benefit immensely from ISDN. Whether you access the corporate LAN in the evenings or maintain a full-time, remote home office, ISDN is the next best thing to being there. E-mail, database access, and file transfers improve dramatically, making it seem like you're locally attached to the LAN. Internet access is another great application for ISDN. Compared with even the fastest modem access, ISDN makes Web graphics appear almost immediately, and can r
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What is ISDN? ISDN Communication Channels In the ISDN interface, a number of communication channels are carried over a digital line. These communication channels can vary by the type of information they transmit and by the transmission speed they support. The number and type of channels used may vary. The communication channels can be of the following types: • B-Channel - 64 Kbps D-Channel - 16 or 64 Kbps H-Channel - 384, 1536, or 1920 Kbps (not yet commercially available) Different combi
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What is ISDN? H-Channel The H-channel is used for high-speed user data traffic at bit rates higher than 64Kbps. Examples of services which require these higher rates are fast facsimile, teleconferencing, and video. An H-channel user can subdivide the channel using TDM to meet specific requirements. DIVA T/A ISDN Modem Reference Guide Page 7
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What is ISDN? Connecting to ISDN - BRI and PRI There are two types of access interfaces to the ISDN: Basic Rate Access (also referred to as Basic Rate Interface (BRI)) and Primary Rate Access (also referred to as Primary Rate Interface (PRI)). Basic Rate Access Basic Rate Interface or Access consists of two B-channels operating at 64 Kbps and one D-channel operating at 16 Kbps. It is also commonly referred to as 2B+D. Primary Rate Access The primary rate interface is designed for users with l
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What is ISDN? What is Multilink PPP? Multilink PPP combines two 64 Kbps ISDN channels to provide a maximum transmission speed of 128 Kbps. The DIVA T/A serves as an intermediary between its host workstation and the remote device to which data is being transmitted. All the protocol processing required for the negotiation of a Multilink PPP connection is performed on the DIVA T/A itself. The PC forwards asynchronous PPP packets to the DIVA T/A which, in turn, converts the packets for synchron
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What is ISDN? What is BACP/BOD? DIVA T/A supports the Bandwidth Allocation Control Protocol (BACP) and Bandwidth on Demand (BOD). BACP/BOD refers to the ability of a system to allocate and remove links in a multilink connection in order to lower or increase its bandwidth. BACP/BOD monitors the flow of traffic across your ISDN connection. When the traffic on the first B-channel reaches a threshold level for a defined period of time (either because of deteriorating line conditions or increased
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What is ISDN? What is DBA? DIVA T/A also supports Dynamic Bandwidth Allocation (DBA), known also as Call Bumping. DBA automatically drops one B-channel to allow an incoming or outgoing telephone, fax or modem call. When the voice call is over, DBA automatically re-establishes the multilink session by reconnecting the second B-channel, if the throughput requires it. It is recommended that you use DBA with BACP/BOD so that you can have greater flexibility when using the DIVA T/A. Note: If an
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What is ISDN? What is Always On / Dynamic ISDN (AO/DI)? AO/DI is only available if you have subscribed to it, your ISDN service provider supports it, and you are using Multilink PPP. AO/DI uses the ISDN D-channel X-25 packet service to maintain an “always on” connection between you and your Service Provider. Low bandwidth requirements can be met using this constant connection, such as sending and receiving e-mail, credit card verification, etc. If additional bandwidth is required (to downloa
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What is ISDN? What is Data Compression? To establish communications over a PPP link, each end of the connection must first send packets to configure and test the data link. After the link has been established, optional facilities may be negotiated as needed. One such facility is data compression. A wide variety of compression methods may be negotiated, although typically only one method is used for both directions of the link. Data compression is a process where the effective throughput is i
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Locating AT Commands To make it easier for you to locate a command, this guide has organized commands in two ways. A list of AT Commands grouped into categories can be found on page 16. An alphabetical list of commands is available on page 17. AT Command Syntax Conventions When issuing AT commands, you must abide by the following syntax conventions: A command line consists of a prefix, body, and terminator. Each command line must begin with “AT” (except A/). AT commands must be termin
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Locating AT Commands The next command will only be accepted by the DIVA T/A once the previous command has been fully executed. DIVA T/A ISDN Modem Reference Guide Page 15
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AT Command Groups The AT commands in this guide are grouped according to their functions. For an alphabetical list of all commands, see page 17. General AT Commands ................................................... 29 ISDN Configuration Commands .................................. 31 COM Port Configuration Commands......................... 36 Call Control Commands.................................................. 39 V.120 Configuration Commands ................................. 42 V.110 Config
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Alphabetical List of Supported AT Commands The following tables summarize, in alphabetical order, the AT Commands supported by the DIVA T/A. Go to the specified page number for more information on a particular command. AT! Commands ................................................................... 18 AT% Commands ................................................................ 20 AT& Commands ................................................................. 21 AT* Commands ...................
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Alphabetical List of Supported AT Commands AT! Commands AT!An Directory Number/Port Assignment (static) 31 AT!C1=n ISDN Switch Type (static) 32 AT!C4=n Enable/Disable Non-initializing mode for primary B-channel (North America 32 only) (static) AT!C5=n Enable/Disable Non-initializing mode for second B-channel (North America 32 only) (static) AT!C6=n ISDN SPID Number for primary B-channel (North America only) (static) 32 AT!C7=n ISDN SPID Number for second B-channel (North America only) (static) 3
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Alphabetical List of Supported AT Commands AT!V3=n V.110 Parity (International version only) 44 AT!V4=n V.110 Stop Bits (International version only) 44 AT!V5=n V.110 Flow Control (International version only) 44 AT!X1=n Specifies the X.25 version you are using. 49 AT!X2=n Specifies the X.25 DTE address. 49 AT!X3=n Specifies the X.25 facilities that are to be included each time a call is made. 49 AT!X4=n Specifies the local ISDN prefixes to be used. 49 AT!X5=n Specifies the X.25 default window siz
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Alphabetical List of Supported AT Commands AT% Commands AT%A2=n Protocol Control (static) 40 AT%A4=n ISDN Communication Speed 40 AT%A95=c Incoming Data Call Answer 40 AT%M1=n Local Endpoint Discriminator Class 46 AT%M2=n Remote Endpoint Discriminator Class 46 AT%M3=n Local Endpoint Discriminator Address 46 AT%M4=n Remote Endpoint Discriminator Address 46 AT%P5=n Enable Bandwidth Allocation Control Protocol / Bandwidth on Demand 46 AT%P6=n Set Initial Billing Interval Timer 46 AT%P7=n Set Billing
