Eicon Networks DIVA T/A ISDN Modem manual Connecting to Isdn BRI and PRI, Basic Rate Access

Page 8

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 large capacity requirements.

There is no single transmission rate defined for primary rate access. In North America and Japan, for example, primary rate interface is based upon the T1 rate (defined in detail shortly) of 1.544 Mbps. In Europe, by comparison, the rate is 2.048 Mbps.

DIVA T/A ISDN Modem Reference Guide ◆ Page 8

Image 8

Contents Diva T/A Isdn Modem Reference Guide Eight Edition July 206-193-08 Contents What is ISDN? Diva T/A Isdn Modem Reference GuideWhat is ISDN? Isdn Communication Channels ChannelChannel Connecting to Isdn BRI and PRI Basic Rate AccessWhat is Multilink PPP? What is BACP/BOD? What is DBA? What is Always On / Dynamic Isdn AO/DI? What is Data Compression? Locating AT Commands Locating AT Commands AT Command Groups Alphabetical List of Supported AT Commands AT! Commands Alphabetical List of Supported AT CommandsAlphabetical List of Supported AT Commands AT% Commands AT& Commands AT* Commands AT Commands AT@ Commands Other AT Commands Registers AT$ Utility Commands Mini-monitor Commands General AT Commands General AT Commands Values for n Isdn Configuration CommandsDefaults Isdn Configuration Commands None default Default1INS-Net64, NI-1, or 5ESS, µ law will be used default AT!D3=nDefault null string this is an optional value AT!N2=nNumber. Numbers are separated by a semicolon AT!N3=nOn region 255 do not attempt 56k data call retry For more details, refer to the Rvscom documentationAT!X56=n COM Port Configuration Commands COM Port Configuration Commands RingFor example, Connect Upon connection, the Diva T/A reports the DCE speedCall Control Commands Call Control Commands ATAATH Configuration Commands Configuration Commands Use the default settings AT!V0=nProfile Commands Multilink PPP Commands Multilink PPP Commands Internet Protocol IP Endpoint Discriminator Class/AddressAT%M3=b3c665ac11 Always On / Dynamic Isdn AT Commands Always On / Dynamic Isdn AT Commands AT!X13=n when Bacp is disabled, see Will be opened after the delay specified by AT!X10Default 1000 bytes AT!X14=nDefault values for each setting, and is defined as follows Default AT!X22=nAT!X18 Defined as followsDefault CF PPP over AT!X25=nConnection numbers affects the range ofAT!X21. SeeAT!X21 AT!X26=nUtility Commands Utility Commands Internal TA access command reserved for VUStart or display the Result of a Lapd trace Start or Display the Result of a PPP traceStart an AO/DI X.25 Trace Enter the monitor on the next resetSoft reset the unit and enter the monitor Register Commands AT?Register Commands Analog Device Commands Analog Device Commands AT*FnTo be disabled Disable. Recommended for modem/fax callsEnable with default values default Enable using same terminal endpoint identifier as data portMini-monitor Commands AT Command Result Codes Carrier Connect AT Command Result CodesConnect Protocol Transparent Mode Connect 75T/1200RConnect 1200T/75R Protocol NoneIndex BACP/BOD