JPS6285526A - Address deciding system for communication station - Google Patents

Abstract

PURPOSE:To prevent the designating mistakes and also to decide automatically the address of an exchange circuit with which the discrimination is impossible between the originating and incoming sides, by informing the numerical value produced in a random number and deciding automatically the addresses of both communicating stations. CONSTITUTION:Plural communication stations have the same constitution. At a station B, a random number generating part 1 is started by an address deciding signal 100 for generation of a random number (b). This number (b) is stored in a register 2 and at the same time an XID command is produced in response to the number (b) and sent to a circuit. Then the XID command reaches a station A at the remote side and is decoded by an XID command receiving part 6. Here the number (b) added to the XID command is supplied to a comparison part 5. While the part 6 starts an MUX 9 as well as an XID response transmitting part 4 to supply a random number (a) stored in the register 2 or produced from the part 1 to the part 5. Then '1' and '3' are selected as the own station addresses with a<b and a>b obtained as the results of comparison from the part 5. These addresses '1' and '3' are also sent to the station B.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Applications] The present invention relates to an address determination method for communication stations connected by communication lines, and in particular to high-level data link control (high-level data link control) recommended by the International Organization for Standardization (rSO). HD below
(Not abbreviated as LC) Procedure for determining the address of a station that communicates using the procedure [Prior art] Connected to a computer or terminal device via a communication line,
When communicating using the DLC procedure, the addresses of both communicating stations must be different. Conventionally,
The addresses of both stations were given as system generation information, or in the case of switched lines, a method was used in which the addresses were uniquely determined by the calling and called parties.

[Problem that the invention seeks to solve]

Among the conventional address assignment methods described above, in the former system generation method, both stations must specify two addresses for themselves and the other station independently, and if the specifications conflict, communication cannot be performed. There is a drawback that there is no In addition, the latter method, in which the address is determined by both the calling and called parties on a switched line, has the disadvantage that it cannot be applied in cases where it is not possible to automatically identify whether a call is a call or a call, such as manual connection by Iruma. .

[Means for solving problems]

The system of the present invention provides random number generation means, a numerical comparison stage, and an address selection means for each of a plurality of other J1α stations, and any one of the plurality of communication stations connected via a communication line. In one of the two stations, the Ei7f random number article number generating means generates a first random number 3 and transmits it to the other station among the two stations. In response to the supply of the random number, the random number generating means of the own station generates a second random number, the numerical comparison means of the other station compares the first random number and the second random number, and Selecting the address of the own station by the address selection means according to a predetermined rule corresponding to the comparison result of the numerical comparison means in the other station, and transmitting the second random number to the =H station;
1) In the one station, the first random number and the second random number are compared by the f-numerical value comparing means, and the above-mentioned random number is The method may include selecting the address of the own station by the address selection means.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 2 is a diagram illustrating a procedure in which one station starts the address determination procedure. Station B, which wishes to communicate, first generates a random number (sets the value to 1) and assigns the value 1) to its own station 1.
The XID command is stored in 3 and sent to the other station A by adding it to the XID command. Exchange identification (
Exchange Identity
a1. i + l II >, and is used to identify the local station or complex station specified in the address field.

It has a function to report characteristics etc. and to report from one's own station (1 Information Processing Handbook, P, +051, edited by Information Processing Society of Japan, published by Ohmsha, January 1985). In this case, both stations A,
Since the B-tora address has not yet been determined, the all-station address is used for the XID command.

In the other station A that received the XID command, the random τk
(the value is set as a). Compare the numerical value 1] notified by the XID command with the numerical value a generated at your own station, and if the numerical value of your own station A is smaller, that is, a4b, then the address of your own station A is °゛1.゛、If it's big, it's Zuna ν
If g+a)b, the address of own station A is determined to be 3°', and an X[D response having the determined address and with a random number a generated by own JA added thereto is transmitted to the other station. Random number 1.1 generated at the XID command receiving station.
If the received random number is equal to the received random number, a random number is generated again. FIG. 3 is a procedure diagram when the address determination procedure is started from both stations at the same time. Both stations individually generate random numbers and store the values in their own stations, and the result is 5.
I) Add it to the command and send it to the partner station. This place &
Since the addresses of both stations are undetermined, the station' address is automatically used for the XID command. XI from the other station
When receiving the D command, compare the value stored in your own station with the value of the other station notified in , if it is larger, the address of the current station is determined to be 3, and an XID response having the determined address and to which a random number previously generated by the own station and sent using the XID command is added is transmitted to the other station. If the random numbers generated at both poles are equal, repeat this procedure from the beginning.

FIG. 1 is a block diagram showing an embodiment of a communication station used in the present invention.

The communication station address determination method shown in FIG. 1 includes a random number generator 1,
The register 2, the XID command transmitter 3, the XID response transmitter 4, the comparator 5, the XID command receiver 6, the XID response receiver 3, and the multiplexer (
8 to 13 (hereinafter abbreviated as Mvx).

Address determination between communication stations A and B having the configuration shown in FIG. 1 will be explained.

Hereinafter, reference numerals in FIG. 1 with a suffixed will refer to station A, and numbers suffixed with b will refer to station B. For example, when referring to the random number generating section 1b, it refers to the random number generating section of 13 stations.

At station 13, address determination request 100b from outside
The random number generator 1b is activated and generates a random number. Once the random number is stored in the register 21) via the MUX 8b, it is supplied to the XID command transmitter 31-). X
The ID command transmitter 31) is! In response to the supply of IL number 1), an X[1,) command is generated, which is sent to MUX1
2b to the line. The destination address of this XII) command is an all-station address, and a random number is also added to this command I~.

The XID command reaches the partner station A and is decoded by the XID command receiving unit 6a via the MUX 13a, and the XID command (=random number 1 added with f) is MLJ X 11
a': The 4X [D command receiving unit 6a starts the XID response transmitting unit 4a and also starts the MuX 9a.

MLIX9a responds to said activation by register 2
Address determination request 100 ; When a random number is stored in L, this value is sent via MLI 8a. Supplied to the comparator 5a via 9a. When the random number is already stored in the register 2a, the A station B station power t corresponds to the case in FIG. 3 where the 7' address determination request is made almost simultaneously. This will be described later.When the comparison result by the comparison unit 5a is a(b), M U
0 a selects °″1゛′ as his own base and a>b
When MU
a is activated to generate a new random number and operate the comparison unit 5a.

If the own address is selected by MUXloa, this own address and the random number a generated by the random number generator 1a are XI
It is supplied to the D response transmitter 1a. The XID response transmitting unit 4a creates an XID response, sets its destination address to the aforementioned all-station address, adds a random number a and the address of station A, and sends it to station B via MUX 1 and 2a. The XID response supplied to station B is MU
It is supplied to the XID response receiving section 7b via X13b. The XID response receiving unit 7b receives the random number a via the MUX 11b in response to the supply of the XII) response.
When this is supplied to the comparator 5b, the M LJ Xb is activated. MUXQb supplies the random number 1) stored in the register 2b to the comparator 51). Comparison part 5)) and M
LI
The movement with Xloa is the same as ・'' and thus M LI
Addresses 1 to B of station B are selected by X 10 b.

If the address determination requests from stations A and B are almost simultaneous in FIG. is a random number, and the ratio 12 r &
The operation is the same as the operation in the non-simultaneous case described in -1-.

In this embodiment, the address of the communication station can be automatically determined as described above.

[Effect of the invention I U, as explained above, the present invention converts the randomly generated numerical value into
By notifying and automatically determining the addresses of both stations to communicate using ID commands, there is no need for a system geostation for address specification, preventing specification errors, and also allowing one call to be sent and one incoming call to be made. This has the advantage that an address can be automatically determined on an exchange line that cannot be identified on the other side.

[Brief explanation of drawings]

FIG. 1 is a program diagram showing one embodiment of the present invention, FIG. 2 is a diagram showing the case where operation 1'=illα of the embodiment of FIG. 1 is started from one station, and FIG. FIG. 3 is a diagram showing a procedure for determining when stations start at the same time. 1...Random number generator, 2...Register, 3...XI
D command transmitter, 4...XID response transmitter,
5. Comparison section, 6... XID command receiving section, 7...
XID response receiving unit, 8.9.10.11.12゜13...Multiflexor (MUX). Agent: Patent attorney Uchihara Sho.

Claims (2)

[Claims] (1) Each of a plurality of communication stations is provided with a random number generation means, a numerical comparison means, and an address selection means, and one of any two stations among the plurality of communication stations connected via a communication line is provided. The station generates a first random number by the random number generating means and transmits it to the other station of the two stations, and the other station generates the random number of its own station in response to the supply of the first random number. generating a second random number by the generating means; comparing the first random number and the second random number by the numerical comparing means of the other station; and comparing the comparison result of the numerical comparing means of the other station. Correspondingly, the address selection means selects the address of the own station according to a predetermined rule, the second random number is transmitted to the one station, and the one station uses the numerical comparison means to select the address of the first station.
and the second random number, and selects the address of the own station by the address selection means according to the rules in accordance with the comparison result of the numerical comparison means in the one station. communication station address determination method. (2) Claim (1) characterized in that the exchange identification command and response code of the high-level data link control procedure are used when transmitting the random number and responding thereto.
Communication station address determination method described in Section 2.