JPH07240744A - Terminal adapter - Google Patents

Abstract

PURPOSE:To enable efficient data communication for which an ISDN network is used when a line is connected by plural calls through plural routes. CONSTITUTION:After a propagation delay time difference detection part 25 decomposes the reception data received from an ISDN network 5 by a line interface part 22 into a time slot, the part 25 determines the propagation delay time difference of each time slot from the detection timing of the detection pattern inserted into each time slot and delivers these time differences to a synchronizing control part 24. After the synchronizing control part 22 decomposes the reception data inputted from the line interface 22 for every time slot, corrects the reception timing of each obtained time slot according to the time difference of each of the time slot and eliminates the propagation time difference of all the time slots, the part 24 outputs data to a user terminal 1 via a terminal interface 26. Thus, the propagation time difference of data passing different routes is eliminated and data communication passing plural routes can be performed without hindrance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ISDN terminal adapter, and in particular, even when a call is connected through a plurality of line routes, synchronization of received data that appropriately arrives through a plurality of line routes. A terminal adapter for matching.

[0002]

2. Description of the Related Art A conventional communication system using an ISDN network has a configuration as shown in FIG. 4, and as the ISDN network 5, an INS net 64, an INS net 1500 or the like is used. The user terminal 1-1 includes a terminal adapter (TA) 2-1 and a digital service unit (DS).
U) 3-1 is connected to the ISDN network 5.
Also, the user terminal 1-2 is a terminal adapter (TA) 2
-2 and a digital service unit (DSU) 3-2, it is connected to the ISDN network 5. The minimum unit of speed (bandwidth) for data communication of this communication system is 6
It is 4 Kbps.

A user terminal 1 of the communication system as described above.
-1 connects two calls (B channel × 2) through the user terminal 1-2 and the ISDN network 5, the station A in the figure,
Since the call connection route is different between a call (B channel) connected via route 2 via C and a call (B channel) connected via route 1 via stations A, B, and C, the data propagation delay time is different. Since they are different, the synchronization of the data communication of the B channel through each route is not guaranteed, and the problem that the route of B channel × 2 cannot be used for the data communication of 128 kbps occurs.

Such a problem occurs not only between the B channels but also between the H ₀ channels in the INS net 1500, and also between the B channels and the H ₀ channels.

[0005] Moreover, the number of calls being connected between opposing set of user terminals may not only two routes, in INS-Net 1500, a maximum _{H 0 × m + B × n} (m, n are 0 or more integers , 6 × m + n ≦ 23), the number of calls is in the range, and when a pair of user terminals facing each other are connected by such a plurality of calls, the same problem as described above occurs.

Therefore, in order to solve the above problems, 128 (64 kbps × 2) to 320 (64 kb)
At the time of data communication of ps × 5) kbps, the H ₀ channel is used and 448 (64 kbps × 7) to 1472 (6
4 kbps × 23) kbps for data communication, H ₁
You will be using the channel.

[0007]

However, since the H ₀ channel has a capacity of 384 kbps, when data communication of 128 kbps is performed, as shown in FIG.
When a vacancy of 56 kbps occurs and data communication of 192 kbps is performed, a vacancy of 192 kbps occurs. In other cases, a vacancy similarly occurs. H ₁ channel is 153
Since it has a capacity of 6 kbps, as shown in FIG. 6, when data communication of 448 kbps is performed, 108
When a free space of 8 kbps occurs and data communication of 512 kbps is performed, a free space of 1024 kbps occurs. In other cases, a vacancy similarly occurs. There is a problem that a band that is not used for data communication is generated and efficient data communication cannot be performed.

Therefore, the present invention eliminates the above-mentioned drawbacks, and when a line is connected by a plurality of calls through a plurality of routes,
It is an object of the present invention to provide an ISDN terminal adapter capable of realizing efficient data communication using an ISDN network by synchronizing data received through each route and performing data communication.

[0009]

According to a first aspect of the present invention, there is provided a terminal adapter which decomposes data received from an ISDN network into time slots and inserts the time slots decomposed by the decomposition means into each time slot. Detecting means for detecting the propagation time difference information of each time slot from the time difference detection pattern, and the propagation time difference of the reception data of each time slot decomposed by the decomposing means based on the propagation time difference information detected by this detecting means And a synchronization means for correcting the timing of the data of each time slot so as to eliminate the above.

In the terminal adapter according to the second aspect of the present invention, the detecting means includes a measuring means for measuring the detection timing of the time difference detecting pattern inserted in each received time slot, and the measuring means And a calculating means for calculating the time difference of the detection timings of the time difference detection patterns of the remaining time slots, with reference to the detection timing of the time difference detection pattern of the time slots detected in step 1.

In the terminal adapter according to the third aspect of the present invention, the synchronization means includes a storage means for temporarily storing the received data of each time slot, and a reading speed corresponding to the propagation time difference information from the storage means. And a control means for reading the data.

A terminal adapter according to a fourth aspect of the present invention includes transmitting means for inserting a time difference detection pattern into each time slot to be transmitted to the ISDN network and transmitting the pattern.

In the terminal adapter according to the fourth aspect of the present invention, the INS net 64 or I is used as the ISDN network.
It is characterized by using NS Net 1500.

[0014]

In the terminal adapter according to the first aspect of the invention, the decomposing means decomposes the data received from the ISDN network into time slots. The detection means detects the propagation time difference information of each time slot from the time difference detection pattern inserted in each time slot decomposed by the decomposition means. The synchronizing means corrects the timing based on the propagation time difference information detected by the detecting means so as to eliminate the propagation time difference of the reception data of each time slot decomposed by the decomposing means. As a result, even if the propagation times differ by passing through a plurality of routes, it is possible to correct these propagation time differences by the synchronization means and perform data communication.

In the terminal adapter according to the second aspect of the present invention, the time difference between the detection timings of the time difference detection patterns of the remaining time slots is set on the basis of the detection timing of the time difference detection pattern of the first detected time slot. Can be calculated, and based on this, data communication can be performed in synchronization so as to eliminate the propagation time difference of the reception data of each time slot.

In the terminal adapter according to the invention described in claim 3, the data of each time slot is temporarily stored,
This can be read at a read speed corresponding to the propagation time difference information, and data communication can be performed in synchronization so as to eliminate the propagation time difference of the reception data of each time slot.

In the terminal adapter according to the invention described in claim 4, by inserting the time difference detection pattern into each time slot to be transmitted to the ISDN network and transmitting the same, the receiving side can receive the reception data of each time slot. The timing can be corrected so as to eliminate the propagation time difference. As a result, even if the propagation times differ by passing through a plurality of routes, it is possible to correct the differences in the propagation times and perform data communication.

In the terminal adapter according to the invention described in claim 5, the ISDN network is the INS net 64 or I.
Through the existing ISDN network called NS Net 1500,
When communication is performed through a plurality of routes, even if the propagation times of the respective routes are different, it is possible to correct these propagation times and perform data communication.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of a communication system using a terminal adapter for ISDN of the present invention. 1 is a user terminal that generates transmission data or receives reception data, 2 is data that is transmitted from the user terminal 1 to the ISDN network, or is data that is transmitted via the ISDN network 5. The user terminal 1
A digital service unit 3 is provided between the terminal adapter 2 and the ISDN network 5 for adjusting the data transmission speed and the like.
It is a DN network. The terminal adapter 2 includes a CPU 21 for controlling the entire terminal adapter, a line interface unit 22 for connecting the digital service unit 3, and I.
A call control unit 23 that performs call control with the SDN network 5 and adds a delay time detection pattern to transmission data, and synchronization control that corrects and synchronizes variations in delay time between received data in each time slot. Unit 24, a propagation delay time difference detecting unit 25 for obtaining a propagation delay time of received data for each time slot, a terminal interface unit 26 for connecting the user terminal 1, and a user data bus 27 for connecting the respective units constituting the terminal adapter 2. have. It is assumed that the illustrated device communicates with the same device oppositely connected via the ISDN network 5. In the above description, the propagation delay time difference detecting unit 25 corresponds to the disassembling unit and the detecting unit, and the synchronization control unit 24 corresponds to the synchronizing unit.

Next, the operation of this embodiment will be described. When the CPU 21 of the terminal adapter 2 recognizes the connection request issued from the user terminal 1, it issues a call instruction to the call control unit 23. For this reason, the call control unit 23 performs call control to the user terminal of the other party designated through the ISDN network 5, and secures a communication path with the user terminal of the other party designated. In this case, it is assumed that a channel for a predetermined number of calls of 2 or more is requested, and a channel for a predetermined number of calls of 2 or more is secured according to the request. After that, when the transmission data is input from the user terminal 1, the call control unit 23 adds a predetermined delay time detection pattern for each time slot corresponding to the above channel, and adds the data to the line interface unit 22. From Digital Service Unit 3
To the ISDN network 5 via. Of course, also in the terminal adapter connected to the user terminal on the partner side, when returning data, the delay time detection pattern is added to each time slot of the channel and transmitted.

Next, the terminal adapter 2 shown in FIG.
The operation when is the receiving side will be described. ISD
The data received from the N network 5 to the line interface unit 22 via the digital service unit 3 is detected by the propagation delay time difference detection unit 25 for each received time slot. That is, the propagation delay time difference detection unit 25 detects the delay time detection pattern added to the data of each time slot, and determines the propagation delay time between each time slot based on the detection timing of this delay time detection pattern. Ask. The synchronization control unit 24 corrects the variation in delay time between the data of the received time slots based on the propagation delay time obtained by the propagation delay time difference detection unit 25 for each time slot, and then the terminal interface unit. The received data is sent to the user terminal 1 through 26.

FIG. 2 is a block diagram showing a detailed example of the propagation delay time difference detecting section 25 shown in FIG. The propagation delay time difference detection unit 25 includes a time slot decomposition unit 11, a pattern detection unit (measurement means) 17, and a delay time control unit (calculation means).
It consists of eighteen. The data transmitted from the user terminal on the communication partner side connected via the ISDN network 5 is received by the line interface unit 22 and then input to the time slot decomposition unit 11 through the user data bus 27. The time slot decomposition unit 11 decomposes the received data into time slots, and sends the decomposed data of each time slot to the allocation pattern detection unit 17. Here, in the case of a 1.5M line, since there are 24 time slots, 24 sets of pattern detection units 17 are provided in parallel. Of course, the received data exists in the time slot only in the time slot corresponding to the channel secured by the above call control.

When the pattern detection section 17 detects a delay time detection pattern from the input time slot data, it immediately notifies the delay time control section 18 of this. In the delay time control unit 18, the pattern detection unit 17 to which the remaining time slots are assigned is based on the time slot assigned to the pattern detection unit 17 that first notifies the detection of the delay time detection pattern. To the notification of the detection of the delay time detection pattern is measured, for example, in units of frames. That is,
In view of the fact that data transmission via the ISDN network 5 is performed by frame synchronization, the delay time control unit 18 determines the time slot from the first notification to the next time slot based on the reproduced or generated frame clock. I will get the time lag until one after another as long as there is a notification. In this way, the delay time control unit 18 obtains the time difference from the time slot related to the first notification to the next time slot based on the notification from each pattern detection unit 17, and further, according to the secured channel, the second And the third, third and fourth time slots are obtained.
The delay time control unit 18 includes all the corresponding pattern detection units 1
7, the time difference is obtained, and then the time difference detection signal 100 for each time slot is notified to the synchronization control unit 24 shown in FIG.

FIG. 3 is a block diagram showing a detailed example of the synchronization control unit 24 shown in FIG. The synchronization control unit 24 includes a time slot decomposition unit 10, a data delay unit (storage means) 12,
The delay controller 13 and the data concentrator 15 are included.
The received data decomposed into each time slot by the time slot decomposition unit 10 is input to the data delay unit 12 to which the corresponding time slot is allocated. On the other hand, the delay control unit 1 assigned to each time slot
The corresponding time delay detection signal 100 is input from the corresponding propagation delay time difference detection unit 25 shown in FIG.

Therefore, each delay control section 13 corresponding to each time slot controls the delay of the input data in the data delay section 12 according to the input time difference detection signal 100. The data delay unit 12 is, for example, a memory (R
AM). The delay control unit 13 cancels the time difference indicated by the time difference detection signal 100, that is, as if the data of the time slot corresponding to the secured channel arrives continuously at a predetermined clock. Address generation is performed so that the data is read from the delay unit 12), and the data once stored in the data delay unit 12 is read using this read address. As a result, the output timing of the data read from the data delay unit 12 assigned to each time slot is as if the output of the data was continuously reached at a predetermined clock. Variations in the amount of data delay are corrected and synchronization is secured. In this way, the synchronization-corrected data is concentrated by the data concentrator 15 and then output from the terminal interface 26 of FIG. 1 to the user terminal 1.

According to this embodiment, the propagation time difference detecting section 25
The delay time of the received data for each time slot is calculated by the synchronization control unit 24 based on these delay times to correct the variation in the delay time of the received data for each time slot to achieve synchronization, and the synchronization corrected data is It is output to the user terminal 1. Therefore, even when a pair of opposing user terminals connected via the ISDN network 5 are connected by a plurality of communication line paths, data can be synchronously transmitted through these communication paths without any trouble.

Therefore, synchronization can be guaranteed by the terminal adapter 2 of the present example for data transmission / reception of a required data amount between a plurality of B channels or a plurality of Ho channels which is not guaranteed in the ISDN network 5. it can. Moreover, the INS net 64 can provide communication up to a maximum of B channels × 2 to terminals using the ISDN network 5.
In the NS net 1500, the maximum Ho × m + B × n (m, n
Is an integer greater than or equal to 0 and can provide data communication up to 6 × m + n ≦ 23), and when transmitting / receiving data that requires an intermediate band, specify the number of channels required for call control. By appropriately setting, the unused band can be minimized and efficient communication can be performed.

As described above, the terminal adapter of this example sends out the delay time detection pattern. However, the reason for stopping the sending of this pattern is the D between the terminal adapters connected via the ISDN network 5. It shall be controlled by control information communication using channel packet communication or the like.

[0029]

As described above, according to the terminal adapter of the present invention as set forth in claim 1, even when a plurality of calls are connected through a plurality of routes, there is a difference in the propagation time of the data received through the respective routes. It is possible to correct and synchronize, and it is possible to secure a plurality of channels of the ISDN network and perform data communication in a required band. In this case, since data communication is performed by securing a band at an integral multiple of the channel of the ISDN network, it is possible to ensure efficient band data transmission without securing a useless band as compared with the conventional case.

According to the terminal adapter of the present invention, the detection of the time difference detection pattern of each of the remaining time slots is detected based on the detection timing of the time difference detection pattern of the first detected time slot. Since the time difference of the timing is calculated, it is possible to correct the deviation of the propagation time between the secured channels and synchronize.
It is possible to secure a plurality of channels of the ISDN network and perform data communication in a required band.

Further, according to the terminal adapter of the invention described in claim 3, since the data of each time slot is temporarily stored and read at a read speed corresponding to the propagation time difference information, it is ensured by the read time. It is possible to correct the deviation of the propagation time between channels and achieve synchronization.

Further, according to the terminal adapter of the present invention as defined in claim 4, the time difference detection pattern is inserted and transmitted in each time slot to be transmitted to the ISDN network, so that the reception side can detect the time difference detection pattern. Based on the detection timing of, the time difference of the detection timing of the time difference detection pattern of each remaining time slot is calculated, and the operation of synchronizing by correcting the deviation of the propagation time between the secured channels is guaranteed. It is possible to correct the deviation of the propagation time of the data received through the route and synchronize.
It is possible to secure a plurality of channels of the ISDN network and perform data communication in a required band.

According to the terminal adapter of the invention described in claim 5, the ISDN network is the INS net 64.
Alternatively, when communication is performed through a plurality of routes via the existing ISDN network called the INS net 1500, even if the propagation times of the routes are different, it is possible to correct these propagation times and perform data communication.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a communication system using an ISDN terminal adapter of the present invention.

2 is a block diagram showing a detailed example of a propagation delay time difference detection unit shown in FIG.

FIG. 3 is a block diagram showing a detailed example of a synchronization control unit shown in FIG.

FIG. 4 is a block diagram showing an example of a communication system via a conventional ISDN network.

FIG. 5 is a diagram showing an example of a free band in data communication using the H ₀ channel.

FIG. 6 is a diagram showing an example of a free band in data communication using the H ₁ channel.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... User terminal 2 ... Terminal adapter 3 ... Data service unit 5 ... ISDN network 21 ... CPU 22 ... Line interface part 23 ... Call control part 24 ... Synchronization control part 25 ... Propagation time difference detection part 26 ... Terminal interface part

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[Procedure amendment]

[Submission date] March 3, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

In the terminal adapter according to the invention described in claim 5 , the INS net 64 or I is used as the ISDN network.
It is characterized by using NS Net 1500.

Claims (5)

[Claims] 1. A terminal adapter for connecting a communication terminal to an ISDN network, the decomposing means for decomposing data received from said ISDN network into time slots, and the time difference inserted in each time slot decomposed by this decomposing means. Detection means for detecting the propagation time difference information of each time slot from the detection pattern, and to eliminate the propagation time difference of the reception data of each time slot decomposed by the decomposition means based on the propagation time difference information detected by this detecting means. A terminal adapter, comprising: a synchronization means for correcting the timing of the data of each time slot. 2. The detecting means comprises a measuring means for measuring the detection timing of the time difference detecting pattern inserted in each received time slot, and a time difference detecting pattern for the time slot first detected by the measuring means. 2. The terminal adapter according to claim 1, further comprising a calculating unit that calculates a time difference between detection timings of the time difference detection patterns of the remaining time slots based on the detection timing. 3. The synchronization means comprises storage means for temporarily storing the received data of each time slot, and control means for reading the data from the storage means at a read speed corresponding to the propagation time difference information. Claim 1
Or the terminal adapter described in 2. 4. The terminal adapter according to claim 1, further comprising a transmitting means for inserting a time difference detection pattern into each time slot to be transmitted to the ISDN network and transmitting the pattern. . 5. The terminal adapter according to claim 1, wherein an INS net 64 or an INS net 1500 is used as the ISDN network.