JPH02111133A - Terminal equipment for assigning automatic terminal terminating point identifier - Google Patents

Abstract

PURPOSE:To make a terminal equipment low in cost and to make the size small by providing a digital timer and a central controller, using the digital timer so as to generate a reference number Ri. CONSTITUTION:Upon the production of a communication request, a central controller 5 reads a timer value of a digital timer 6. Then an ID request message including the timer value set as Ri is sent to an ISDN communication control circuit 4. The said control circuit 4 sends an ID request message received by an ISDN 1. Then the IN allocation message including the value Ri is received from the ISDN 1 and the message is sent to the central controller 5. The central controller 5 compares the sent ID request message with the value Ri included in the received ID allocation message and a terminal termination point identifier TEI is decided from the ID allocation message when they are coincident and the communication is applied by using the TEI.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial application field The present invention is directed to an integrated digital service network (ISDN:
egrated 5service Digital
The present invention relates to an automatic TEI (Terminal Termination Point Identifier) assigned terminal used in the Internet.

<a> Conventional technology I A plurality of terminals used in SDN can be connected on the same line. Therefore, in order to identify each terminal, it is necessary to allocate a TEI (Terminal Termination Point Identifier) to each terminal at the time of the first call origination or incoming call after the power is turned on. Tl1fio
It can take values between 127 and 127.

The TEI from 0 to 63 is selected by the user of the terminal, and must be assigned at the user's responsibility so as not to take the same value as other terminals connected to the same line. 0～
A terminal that takes a TEI of 63 is called a non-automatic TEI assigned terminal.

Further, the TEIs from 64 to 126 are selected by the network and must be assigned under the network's responsibility so as not to take the same value as other terminals connected to the same line -L. 6↓〜12
A terminal that takes a TEI of 6 is called an automatic TEI assignment terminal, and needs to send an ID request message to the network in order to receive and receive a TEI from the network.

Note that TEI=127 is used as a group TEI that targets all terminals.

By the way, in the automatic TET assignment terminal, a reference number (Ri: Ri takes a value from 0 to 65535) is included in the ID request message so that multiple automatic TEI assignment terminals that can simultaneously send ID request messages requesting TEL assignment can be identified. ) must be configured (rIN3 Net Service Interface, published by Telecommunications Association of Japan, p. 145)
reference). Therefore, it has an internal 16-bit pseudo-random number generation circuit, and this circuit generates the reference number (Ri).
DNJtlLsI has been put into practical use.

(Details of network interface protocols and compatible products for rlsDN users, published by L. Rikeps Co., Ltd. P125~
(See page 134).

(...) The problem that the invention seeks to solve is that the LS for 15DN with a built-in random number generation circuit
I is only a small part of the ISDN LSI currently on the market, and it is an I5DN that does not use an LSI for automatic TEI assignment or a random number generation circuit.
When configured using a commercial LSI, some kind of random number generator is required. The random number generator has a complicated circuit configuration, and automatic T
This has the disadvantage that the EI allocated terminal becomes more expensive and larger.

The present invention has been devised in view of the above-mentioned circumstances and is an automatic TE capable of generating reference numbers by forming a simple circuit.
The aim is to provide I-assigned terminals.

(D) Means for Solving the Problems The present invention uses a digital timer that is activated when the power is turned on, reads the timer value of the digital timer when one communication request occurs, and uses this timer value as a reference license (Ri). An automatic TE characterized by comprising a central control unit and
This is an I-assigned terminal.

(1) Effect According to Akira, the timer value of the digital timer at the time of a communication request becomes the reference number (Ri).

(F) Embodiment FIG. 1 is a brochure diagram for explaining an embodiment of the present invention.

In the figure, (1) is l5DN, and this IsDN
(1) A line termination device (D51 (
2) is connected. A plurality of automatic TEI assignment terminals (3a) C3b) (3c)... are connected to this DSU (2). Automatic TEI assignment terminal (3a) (3b)
(3c) exists on the same line -J2.

In addition, the automatic TEI assignment terminal (3a) is connected to an ISDN communication control circuit (4) that sends and receives communication data and controls protocols, a central control circuit (5) that controls the entire system, and a tarot card from the central control circuit (5). It consists of a digital timer (for example, a 16-bit timer) (6) that captures the timer value and outputs the timer value to the central control circuit (5). In addition, automatic T
E I ;! The JIJ terminals (3b), (3c), etc. also have a similar configuration, although illustration is omitted.

FIG. 2 is a flowchart of one embodiment of the present invention, and the operation will be explained based on this flowchart.

When the automatic TEI allocation terminal is powered on, the central controller (5) is activated and the central controller (5) supplies a clock to the digital tie 7 (6) (i.e. activates the digital timer (6)). and initialize the system. When a communication request (call origination or incoming call) occurs here, the central control unit (5) reads the timer value of the digital timer (6). And the central control device (5)
This timer value is set as Ri, and an ID request message including the second R1 is sent to the 15I)N communication control circuit (4).

Is r)N communication control circuit (4) is D S U (2)
Sends the received ID request message to ISD\(1) via. Subsequently, the l5DN communication control circuit (4)
1) is received from l5DN(1) via 1)S(,'(2), and this received ID
Send the assignment message to the central control M station (5). The central control unit (5) compares R1 included in the sent ID request message and 1S1 included in the received ID assignment message, and if they match, sends a TEL from the ID assignment message.
is determined, and communication is performed using this TEI.

Note that the timer value is determined by the activation timing, reading timing, and tarok frequency.

Therefore, unless the timing of starting the timer, i.e., the timing of turning on the power of the terminal, and the timing of reading), i.e., the timing of the first call or arrival, are not intentionally set, the timer value will be determined by chance. , if a 16-bit tie 7 is used, values from 0 to 65535 can be covered, so even if ID request messages are sent simultaneously between multiple terminals, the probability of setting the same Ri is very low.

Furthermore, in this embodiment, the central control device (5) supplies a clock to start the digital timer (6), but it is also possible to supply a clock from a source other than the central control device (5) to start the digital timer (6). You may let them.

(G) Effects of the Invention As is clear from the above description, the present invention utilizes a simple circuit structure, that is, a digital timer, to achieve the reference number (Ri).
, it is possible to reduce the price and size of terminals.

[Brief explanation of the drawing]

FIG. 1 is a process diagram for explaining an embodiment of the present invention, and FIG. 2 is a flowchart of an embodiment of the present invention. (3a) (3b) (3c) - = automatic TEI assignment terminal, (
4) -15DN communication control circuit, (5)... central control circuit, (6) digital timer.

Claims (1)

[Claims] 1. A digital timer that is activated when the power is turned on; and a central control device that reads the timer value of the digital timer when a communication request occurs and uses this timer value as a reference number (Ri). Automatic terminal termination point identifier assignment for terminals.