JPH0824330B2 - ISDN terminal device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to ISDN (Integrated Services Digital Network).
k) It relates to a terminal device connected to a subscriber line, and particularly to a line connection method in the terminal device.

[Conventional technology]

Conventionally, terminal devices distributed over a wide area (for example, data terminals,
When connecting LANs (computers) to each other to form a LAN (local area network), dedicated lines for data lines are used or LANs are formed by using public lines dedicated to data such as DDX (digital data exchange).

[Problems to be Solved by the Invention] By the way, when a dedicated line is used, it is difficult to change the connection partner, and in general, the LAN form once decided is used semi-fixed, and is rarely changed. And
It is not possible for a single terminal device to repeatedly join and leave multiple LANs by dividing the time.

On the other hand, when a public line is used, an unspecified number of subscribers share the network and cannot reject incoming calls from unspecified parties, making it difficult to reliably form a line with the specified party at a specified time. . Therefore, a public line is not used for a loop type LAN in particular, and a one-to-one bowling type communication system is generally used, which is not suitable for a LAN composed of a plurality of users.

An object of the present invention is to provide a terminal device capable of repeating participation and withdrawal by dividing time into a plurality of LANs.

[Means for solving the problem]

The ISDN terminal of the present invention stores the connection source address and the connection destination address included in the incoming call code that arrives at the control channel (D-CH) of the ISDN subscriber line having a pair of connected call channels and one control channel. A recognition means for recognizing, a destination side address table and a source side address table with time as a parameter, a clock for notifying the time, and a comparison means for comparing the contents previously stored in the destination side address table with the connection source address, A calling party which makes a call according to an instruction (time) issued by the clock to a party having contents stored in the calling side address table, and a called party on one of the call channels on the subscriber line, Another feature is that the other communication channel maintains a communication line with the calling party.

〔Example〕

 The present invention will be described below with reference to examples.

A terminal device according to the present invention will be described with reference to FIG. The ISDN subscriber line (not shown) is connected to the terminal 1 and separated by the multiplexer / separator 2 into the call channels B1 and B2 defined by CCITT and the control channel D, and the call channel B1.
And B2 are connected to terminals 3 and 4, respectively, and the control channel D is connected to link controllers 5 and 8. A multi-link can be formed on the control channel D with the network, and the link control units 5 and 8 independently form a data link with the network. For example, a destination address table 7 and a source address table 10 are connected to the call connection control units 6 and 9 each composed of a microcomputer, and the destination address table 7 and the source address table 10 are CCITT-connected. Connection source address (Calling part) included in the call control code specified in Recommendation Q.930 / 931
y number / subaddress), connection destination address (Called part
The code corresponding to (y number / subaddress) is stored in advance.

Further, a clock 11 is connected to the call connection control units 6 and 9, and the call connection control units 6 and 9 can always obtain the current Greenwich standard time from the clock 11.

 The operation of the present invention will be described below with reference to FIG.

21,23 and 25 are ISDN terminal devices with the above-mentioned configuration.
Through the network, the terminal device 21 is the terminal devices 23 and 25, the terminal device 23 is the terminal devices 21 and 25, and the terminal device 25 is the terminal device 23.
And 21 to form a communication line at a predetermined time to construct a loop type LAN.

Here, the call start time and the call end time are defined in the originating side address table 10 corresponding to the respective connection destination addresses, and similarly, the destination side address table 7 corresponds to the respective connection source addresses. A call start time and a call end time are defined by the call.

When the clock 11 of the terminal device 21 reaches a predetermined time (that is, the call start time), the call connection control unit 9 includes the connection destination address stored in advance in the calling side address table 10 corresponding to this call time. Send the calling code (SETUP) to the ISDN network via the ISDN subscriber line. For example, a terminal device
The call connection control unit 9 of 21 compares the call start time of the calling side address table 10 with the current time notified from the clock 11, and if they match, the code described in the connection destination address item corresponding to the matched call start time. (For example, code (23): telephone number of terminal device 23) is read and a calling code (SETUP)
And send it to the ISDN network via the ISDN subscriber line.
For transmission, the link control unit 8 opens a call control link with the network on the control channel D on the subscriber line by the procedure defined in CCITT Recommendation I.431 or the like. The ISDN network sends the calling code to the terminal device 23 according to the connection destination address included in this code and prepares a communication line.
On the other hand, in the terminal device 23, when the clock 11 reaches a predetermined time (call start time), the call connection control unit 6 causes the connection source address reference number corresponding to the predetermined time stored in the incoming call address table. Read the incoming call code (SE
TUP), and compared with the connection source address included in the TUP) to form a call line with a matching response. If they do not match, no response is given. For example, when there is an incoming call to the ISDN subscriber line, make sure that the current time notified from the clock 11 is between the call start time and the call end time of the destination address table 7, and set the connection address item. The code described (for example, the code (25) the telephone number of the terminal device 25) is read and compared with the connection source address included in the incoming call code (SETUP). Then, only when they match, the call line is formed by responding. If they do not match, no response is given. Similarly to the terminal device 21, the terminal device 23 makes a call to form a communication channel with the terminal device 25 (two communication channels can be simultaneously used by one subscriber in the ISDN network.
As in the case of 21, the terminal devices 23 and 25 respectively control incoming / outgoing call connection, and the clock 11 of each terminal device simultaneously activates the control so that the loop shown in FIG. It is formed. Moreover, even if an unscheduled incoming call arrives at any of the terminal devices 21, 23, and 25 at the same time, the connection is rejected by checking the connection source address.
The certainty of loop formation is extremely high.

In addition, the address of the calling / receiving side can be stored with the address of the other party different at each time, and the terminal devices 21, 23, and 25 can join and leave the loop different at each time. it can. For example, the terminal device 21 forms a loop composed of the terminal devices 21, 23, and 25 from 8 o'clock to 10 o'clock, but from 14:00 to 16 o'clock, it loops with another terminal device not shown. Will be formed.

〔The invention's effect〕

As described above, according to the present invention, the source address reference number stored in the destination address table with the time as a parameter is compared with the source address included in the destination code coming from the ISDN network, and if they match, a response is returned. Then, a calling line is formed, and a calling code is sent to the ISDN network according to the connection destination address number stored in the calling address table with time as a parameter, and a calling line is formed with the other party of the same number. Therefore, the terminal device according to the present invention can form a reliable and unique communication loop regardless of the public line, can switch the form of the loop moment by moment, and can optimize the service according to the amount of communication and waste. It is possible to avoid the uneconomical situation of owning a private line.

[Brief description of drawings]

FIG. 1 is a functional block diagram of the ISDN terminal device of the present invention, and FIG.
The figure is a line connection model diagram using the terminal device of the present invention. 1 ... ISDN subscriber line terminal, 2 ... Multiplexing / separating unit, 3, 4 ... Call channel input / output terminal, 5, 8 ... Control channel (D) link control unit, 6, 9 ... Call connection control Part, 7 ... Destination address table, 10 ... Originating address table, 11 ... Clock, 21, 23, 2
5 …… ISDN terminal, 22, 24, 26 …… Call line.

Claims (1)

[Claims] 1. A communication means connected to an ISDN subscriber line to communicate with a network via the subscriber line, a clock means for notifying time, and connection source address information according to a call start time and a call end time. And a calling side address table storing a code corresponding to the connection destination address information according to the call start time and the call end time, and a calling side address table storing a code corresponding to When the predetermined time is a predetermined time, the connection source address information code corresponding to the time obtained from the clock means and the connection source address information coming from the network are compared, and the comparison means obtains from the clock means. When the predetermined time reaches a predetermined time, a call is made to the network by using the connection destination address information code corresponding to the time obtained from the clock means as the connection destination address. An ISDN terminal device, comprising: calling means, wherein the originating and terminating communication lines are formed in the network based on the time indicated by the clock means.