US 5,309,442 AGranted

ISDN terminal system

AssigneeKabushiki Kaisha Toshiba

InventorTakashi Saeki

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Abstract

Disclosed is an ISDN terminal system which can automatically select one exchange method according to terminal equipments to communicate with. The ISDN terminal system 1 which can selectively adopt the line exchange or packet exchange comprises an analyzing section 203 for analyzing a call setup message received from the ISDN 3 to recognize the exchange mode designated by the calling terminal equipment, and exchange mode selecting sections 213, 103, 107 and 109 for selectively adopt either one of the line exchange or the packet exchange according to the exchange mode recognized by the analyzing section. The system further comprises an input section 11 for inputting compacted telephone numbers, a memory section 15 for registering telephone numbers previously determined according to the compacted telephone numbers and the previously determined exchange modes, reading sections 209 and 207 for reading the previously registered telephone number and exchange mode from the storing section in response to the inputted compacted number, transmitting sections 201 and 105 for forming a call setup message including information indicative of the read telephone number and exchange mode and transmitting the formed message to the ISDN 3, and exchange mode selecting sections 213, 103, 107, and 109 for selectively adopt either one of the line exchange or the packet exchange according to the read exchange mode.

Claims13

Dependent claims

An ISDN terminal system connected between a data terminal, having a data processing device for processing data received from an ISDN, and an integrated service digital network (ISDN) to which various other ISDN terminal systems having line exchange and packet exchange communication modes are connected, in which said line exchange communication mode exchanges data by connecting data terminals upon a communication request and exclusively using a communication line between the connected data terminals until a connection therebetween is released, and said packet exchange communication mode exchanges data by dividing data to be transmitted into a plurality of packets, each having a destination and a predetermined length, such that data terminals on transmission and reception sides only occupy channels when transmitting or receiving one of said packets without exclusive possession of any communication line, said ISDN terminal system comprising:

analyzing means for analyzing a call setup message attached to data received from said ISDN, said call setup message including a telephone number and exchange mode information indicating whether the received data is processed using said line exchange communication mode or said packet exchange communication mode;
line exchange communication means for, when said data received from said ISDN has been transmitted from one of said other ISDN data terminal systems using the line exchange communication mode, establishing a communication using said line exchange communication mode by matching a data transfer speed of said data terminal to a data transfer speed of the transmitting ISDN data terminal system;
packet exchange communication means for, when said data received from said ISDN has been transmitted from one of said other ISDN data terminal systems using the packet exchange communication mode on a particular time-division channel, establishing a communication using the packet exchange communication mode by setting a time-division channel of said data terminal to the particular channel used by the transmitting ISDN data terminal system;
and
control means for controlling a communication between said ISDN and said receiving data terminal by generating a changeover control signal indicating whether said receiving data terminal should be connected with said line exchange communication means or said packet exchange communication means based on said exchange mode information obtained by said analyzing means, and by selecting a communication path connected between said receiving data terminal and said ISDN to include either said line exchange communication means or said packet exchange communication means in response to said changeover control signal.

2 more elements

line exchange communications means for establishing a communication using said line exchange communication mode by matching a data transfer speed of data transmitted from said data terminal with a desired data transfer speed for transmission through said ISDN;
packet exchange communication means for establishing a communication using said packet exchange communication mode by setting a time-division channel on which data is transmitted from said data terminal to a desired time-division channel for transmitting said data through said ISDN;
storing means for storing said data transfer speed set by said line exchange communications means and said time-division channel set by said packet exchange communication means as predetermined exchange mode information;
transmitting means for transmitting a call setup message to said ISDN using one of said packet exchange communication mode or said line exchange communication mode, said call setup message being formed from at least a telephone number and said exchange mode information read out from said storing means;
and
control means for controlling a communication path of data transmitted from said data terminal in accordance with said exchange mode information included in said call setup message, by selecting either said line exchange communication means or said packet exchange communication means for transmission of data to said ISDN.

3 more elements

Dependencies are inferred from the claim text.