JPH11284594A - Multiplexing transmitter in multiplexing data communication - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change a transmission rate, in accordance with respective signal quantity multiplexed communication without disconnecting the communication. SOLUTION: A CPU 11 indicates a multiplex and separation circuit 12 the sizes (i.e., switching timing) of areas for 1st and 2nd protocols. A multiplexing part of the circuit 12 multiplexes the data supplied from a communication protocol 4, data supplied from a communication protocol 5 and area information which is indicated from the CPU 11 and shows a timing, in which each area is switched in a prescribed timing and transmits them to a transmission line 3. A separating part of the circuit 12 discriminates a data break from the area information and extracts respective data from the areas for the protocols 4 and 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a variable transmission rate method in data transfer in which data for a plurality of protocols is multiplexed and transmitted on one transmission line.

[0002]

2. Description of the Related Art Hitherto, when multiplexing data for a plurality of protocols on one transmission line and performing communication, the transmission side and the receiving side have performed according to a multiplexing format determined in advance. By the way, in the conventional technology, since the area allocated to each protocol is fixed, the communication rate is constant, and if there is a communication data amount exceeding that, data may be lost or delayed. When the signal amount is small, an extra signal such as an idle signal is generated to maintain the protocol.

[0003]

For this reason, when the amount of data to be transmitted increases or decreases, the transmission rate (multiplex format) must be changed in order to increase the transmission efficiency. It was necessary to temporarily disconnect the communication and reset the multiplex format. However,
If the data amount frequently changes between protocols, communication must be temporarily disconnected, resulting in a problem that transmission efficiency is deteriorated. Also, when the signal to be multiplexed is an uplink signal and a downlink signal between terminals, the data amount may greatly change between uplink and downlink, but in the related art, the transmission rate is changed in real time. Therefore, it is necessary to disconnect the communication once or to transmit and receive data at the same transmission rate, which results in a problem that transmission efficiency is deteriorated.

[0004] The present invention has been made in view of the above-mentioned circumstances, and it is possible to change a transmission rate according to the amount of communication signals without disconnecting communication, and to perform data communication with high efficiency. It is an object to provide a variable transmission rate method for transfer.

[0005]

In order to solve the above-mentioned problem, according to the first aspect of the present invention, in a data transfer for multiplexing a plurality of signals on one transmission line and transmitting the multiplexed signal, a transmitting side requires a plurality of signals. Configuring a large frame having a predetermined size consisting of time-series frames, and determining the size of a transmission area for each of the plurality of signals in the large frame, in units of the large frame, Generating area identification information for identifying the transmission area based on the size of the transmission area; and transmitting the plurality of signals together with the corresponding area identification information in a time-series frame of the transmission area. The receiving side identifies area identification information for identifying the transmission area, and determines which transmission area the transmission area is. A step of determining, on the basis of the discriminated transmission area, characterized by a step of extracting a signal from the time-series frames.

Further, according to the invention described in claim 2, according to claim 1,
In the variable transmission rate method for data transfer described above, the area identification information is inserted into respective first bits of the plurality of time-series frames.

[0007] According to the third aspect of the present invention, the first aspect of the present invention.
In the variable transmission rate method in the data transfer described above, the large frame is composed of a plurality of blocks in which the plurality of time-series frames are grouped by a predetermined number, and the area identification information is a head in each of the plurality of blocks. Is inserted in the time series frame of

Further, according to the invention described in claim 4, according to claim 1,
4. The variable transmission rate method in data transfer according to any one of claims 3 to 3, wherein the plurality of signals are at least transmission / reception signals transmitted / received between a transmission side and a reception side.

According to the present invention, the size of the transmission area for each of a plurality of signals in a large frame is determined on a large frame basis on the transmission side, and the area identification information for identifying the transmission area is determined on the reception side. By identifying, it is determined which signal transmission area it is, and based on the determination result, a signal is extracted from the time-series frame. Therefore,
The transmission rate can be changed according to the communication signal amount without disconnecting the communication, and efficient communication can be performed.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. A. Configuration of Embodiment FIG. 1 is a block diagram showing the configuration of a mobile communication base station apparatus to which a variable transmission rate method in data transfer according to the present invention is applied and a higher-level apparatus thereof. In the figure, one transmission line 3 is provided between a mobile communication base station device 1 and its higher-level device 2.
Communication is performed using two protocols. The mobile communication base station device 1 and the host device 2 each include a protocol 4 corresponding to a first protocol, a protocol 5 corresponding to a second protocol, and a multiplexing / demultiplexing unit 6. Communication protocol 4 corresponds to the first protocol,
Communication protocol 5 corresponds to the second protocol. The multiplexing / demultiplexing unit 6 multiplexes the data for the first protocol and the data for the second protocol and sends the multiplexed data to the transmission path 3 (transmission side). And data for the second protocol are separated and extracted (reception side).

FIG. 2 is a block diagram showing a schematic configuration of the multiplexing / demultiplexing unit 6 including a protocol. Note that parts corresponding to those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted. In the figure, the multiplexing / demultiplexing unit 6 includes a synchronization detection circuit 10, a CP
U11 and a multiplexing / demultiplexing circuit 12. The synchronization detection circuit 10 detects a synchronization signal (synchronization pattern) from the multiplexed signal on the transmission path 3 and supplies it to the multiplexing / demultiplexing circuit 12. The CPU 11 controls the multiplexing / demultiplexing circuit 12
The size of the area for the first protocol and the size of the area for the second protocol (that is, switching timing) are instructed.

The multiplexing / demultiplexing circuit 12 includes a multiplexing unit and a demultiplexing unit. The multiplexing unit multiplexes the data supplied from the communication protocol 4 and the data supplied from the communication protocol 5 at a predetermined timing, and indicates the synchronization signal and the timing at which each area is instructed by the CPU 11. The information is transmitted to the transmission path 3 with the area information added. Further, the separation unit identifies a super frame based on the synchronization signal detected by the synchronization detection circuit 10, determines a data delimiter from the area information, and determines the area for the first protocol from the multiplexed signal on the transmission path 3. Then, an area for the second protocol is separated to extract respective data, data for the first protocol is supplied to the communication protocol 4, and data for the second protocol is supplied to the communication protocol 5.

FIG. 3 is a conceptual diagram showing a signal format of a multiplexed signal on the transmission line 3. As shown in FIG. In the figure, when the transmission rate of the transmission line 3 is 64 kbps, 1 byte is 1 byte.
Frames, and all 320 frames are superframes. In addition, each frame number is set to 0 to 319, and an area for the first protocol and an area for the second protocol are configured in one superframe. In the 0th frame, data “3Fh” is used as a synchronization pattern.
And

The most significant bit of each 1-byte frame is used as a protocol area identification. That is, 0
Immediately after the frame, the place where the most significant bit is “1” is the area for the first protocol, and the place where “0” is the area for the second protocol. The signal data uses 7 bits excluding the most significant bit of each frame, and sequentially connects 7 bits in a continuous frame to form a data string.

In the multiplexing section of the multiplexing / demultiplexing circuit 12 shown in FIG. 2, in order to transmit communication data to the transmission line 3, 320 frames (super frames) of 0 to 319 are first formed, and then the 0th frame is formed. Insert the synchronization pattern into Next, the data string for the first protocol is divided in units of 7 bits, and “1” is added to the most significant bit to obtain 1
One frame is formed and transmitted continuously to the end of the area for the first protocol. Then, when the transmission of the area for the first protocol is completed, the data string for the second protocol is converted to a data string of 7 in the same manner as in the first protocol.
Each frame is divided into bits, and “0” is added to the most significant bit to form one frame, which is continuously transmitted up to 319 frames. For example, in the example shown in FIG. 3, the area for the first protocol is the first to 100th frames, and the area for the first protocol is the 101st to 319th frames.

The demultiplexer in the multiplexing / demultiplexing circuit 12 shown in FIG. 2 recognizes the position of the super frame based on the position of the 0th frame detected by the synchronization detecting circuit 10. Further, the most significant bit is monitored from the first frame, and the 7 bits of the frame whose most significant bit is “1” are extracted to form a data string for the first protocol. If the most significant bit is “0”, seven bits are continuously extracted from one frame to form a data string for the second protocol.

In each of the mobile communication base station 1 and the high-level equipment 2, the CPU 11 controls the multiplexing section of the multiplexing / demultiplexing circuit 12 to separate a first protocol area from a second protocol area. Is indicated in what frame. For example, the CPU 1 of the mobile communication base station 1
1 indicates to the multiplexing / demultiplexing circuit 12 that the area up to the 200th frame is the area for the first protocol,
The area up to the 00th frame is the area for the first protocol, and the area up to the 201st to 319th frames is the area for the second protocol. This area switching can be performed from any super frame during communication. That is, the transmission rate can be changed without disconnecting the protocol link. The details will be described later.

FIG. 4 is a block diagram showing an example of the configuration of the multiplexing section (multiplexing function) of the multiplexing / demultiplexing circuit 22.
The same reference numerals are given to the portions corresponding to FIG. The clock oscillator 71 generates a 64 kbps clock. The counter 72 counts the clock and outputs the count value S1 to the synchronization pattern insertion circuit 73.
It is supplied to the most significant bit insertion circuit 74 and the comparator 78. The synchronization pattern insertion circuit 73 inserts a synchronization pattern in the 0th frame according to the count value S1 from the counter 72 and supplies the same to the multiplexing circuit 77. The most significant insertion bit circuit 74 inserts an area identification bit into the most significant bit of each frame and supplies it to the multiplexing circuit 77 according to the count value S1 from the counter 72 and an insertion signal S3 from a comparator 78 described later. The first protocol insertion circuit 75 inserts the data for the first protocol into the lower 7 bits of each frame for the first protocol and supplies the data to the multiplexing circuit 77. Second protocol insertion circuit 76
Inserts the data for the second protocol into the lower 7 bits of each frame for the second protocol and supplies it to the multiplexing circuit 77.

The CPU 11 supplies to the comparator 78 a frame switching value S2 for designating a position (frame) for switching between the area for the first protocol and the area for the second protocol. The comparator 78 is provided with a counter value S1 of the above-described counter 72 for switching the area.
Is compared with the frame switching value S2 instructed by the CPU 11, and when the count value S1 reaches the frame switching value S2, the insertion signal S is sent to the most significant bit insertion circuit 74.
Supply 3. The multiplexing circuit 77 multiplexes data supplied from the synchronization pattern inserting circuit 73, the most significant bit inserting circuit 74, the first protocol inserting circuit 75, and the second protocol inserting circuit 76 according to the clock from the oscillator 71, It is transmitted to the transmission path 3.

FIG. 5 is a block diagram showing an example of the configuration of the demultiplexing section (demultiplexing function) of the multiplexing / demultiplexing circuit 22. In the figure, a synchronization pattern detection circuit 81 detects a synchronization pattern from a multiplexed signal on the transmission line 3 and recognizes a position of the superframe configuration (the position of the 0th frame). The method of detecting a synchronization pattern by the synchronization pattern detection circuit 81 is based on synchronization protection (6 forward) to prevent erroneous recognition of the pattern.
Stage, 3 stages behind) detection. In the following three stages, after detecting the synchronization pattern “3Fh”, it is checked whether or not the synchronization pattern exists even after 320 frames. If the synchronization pattern “3Fh” is detected three times consecutively, the synchronization position is detected. Become. On the other hand, in the front six stages, when the synchronization pattern “3Fh” does not exist at the position of every 320 frames continuously from the state where the synchronization position is detected (the state where the synchronization pattern is recognized every 320 frames), It will be off.

The separation circuit 82 includes a synchronous pattern detection circuit 8
According to the position detection by 1, the most significant bit of each frame is monitored, and if it is “1”, it is extracted as data for the first protocol and transmitted to the first protocol 83.
Similarly, if the most significant bit is “0”, it is extracted as data for the second protocol and transmitted to the second protocol.

B. Next, the operation according to the above-described embodiment will be described. First, in each of the mobile communication base station 1 and the host device 2,
The CPU 11 instructs the multiplexing section of the multiplexing / demultiplexing circuit 12 in what frame the division between the area for the first protocol and the area for the second protocol is to be performed.
Here, it is assumed that, at the time of the first communication, it is instructed to set the area for the first protocol to the first to 100th frames and the area for the second protocol to the 101st to 319th frames.

The multiplexing unit in the multiplexing / demultiplexing circuit 12 on the transmitting side forms 320 frames from 0 to 319,
A synchronization pattern is inserted in the frame. Next, the data string for the first protocol is divided in units of 7 bits, and “1” is added to the most significant bit to constitute one frame.
The data is continuously transmitted from the first frame to the 100th frame in the area for the first protocol. When the transmission of the data for the first protocol is completed, the data sequence for the second protocol is divided into 7-bit units in the same manner as in the first protocol described above, and "0" is added to the most significant bit. Thus, one frame is formed and continuously transmitted from the 101st frame to the 319th frame.

On the other hand, the demultiplexing section of the multiplexing / demultiplexing circuit 12 on the receiving side recognizes the position of the super frame based on the position of the 0th frame detected by the synchronization detecting circuit 10. Furthermore, the most significant bit is monitored from the first frame, and the most significant bit of the frame whose bit is “1” is 7
The bits are extracted to form a data sequence for the first protocol. If the most significant bit is “0”, 7 bits are continuously extracted from one frame to generate a data sequence for the second protocol. Constitute.

Here, the operation of the multiplexing unit will be described in more detail with reference to FIG. In the multiplexing section, the counter 72
Then, the clock from the clock oscillator 71 is counted, and the count value S1 is supplied to the synchronization pattern insertion circuit 73, the most significant bit insertion circuit 74, and the comparator 78. As described above, the CPU 11 supplies the comparator 78 with the frame switching value S2 for instructing the position (frame) at which the area for the first protocol and the area for the second protocol are switched. . In this case, the 101st frame is a switching position from the area for the first protocol to the area for the second protocol. In the comparator 78, in order to switch the area,
The count value S1 of the counter 72 described above is compared with the frame switching value S2 specified by the CPU 11, and when the count value S1 reaches the frame switching value S2 (the 101st frame), it is inserted into the most significant bit insertion circuit 74. A signal S3 is provided.

First, in the 0th frame, a synchronization pattern is inserted by the synchronization pattern insertion circuit 73 and transmitted from the multiplexing circuit 77 to the transmission line 3. Next, since the insertion signal S3 from the comparator 78 is not supplied from the first frame to the 100th frame, the most significant bit of each frame is provided by the most significant insertion bit circuit 74 in the area for the first protocol. Area identification bit "1" indicating that there is
Is inserted. The lower 7 bits of each frame include
The first protocol insertion circuit 75 inserts data for the first protocol. The data for the first protocol for one frame consisting of the area identification bits and the lower 7 bits is sequentially transmitted to the transmission line 3 by the multiplexing circuit 77.

When the count value S1 of the counter 71 becomes "101", that is, at the 101st frame, the insertion signal S3 is supplied from the comparator 78 to the most significant bit insertion circuit 74. As a result, from the 101st frame to the 319th frame, the area identification bit “0” indicating the area for the second protocol is added to the most significant bit of each frame by the most significant insertion bit circuit 74.
Is inserted. The lower 7 bits of each frame include
The second protocol insertion circuit 76 inserts data for the second protocol. The data for the second protocol for one frame composed of the area identification bits and the lower 7 bits is sequentially transmitted to the transmission line 3 by the multiplexing circuit 77.

Here, the operation of the separation unit will be described in more detail with reference to FIG. In the separation unit of the multiplexing / demultiplexing circuit 12, a synchronization pattern is detected from the multiplexed signal on the transmission path 3 by the synchronization pattern detection circuit 81, and the separation circuit 82
Supplied to The separation circuit 82 monitors the most significant bit of each frame. If the most significant bit is “1”, the lower 7 bits are extracted as data for the first protocol and supplied to the communication protocol 4. On the other hand, if the most significant bit is “0”, it is extracted as data for the second protocol and supplied to the communication protocol 5.

FIG. 6 is a conceptual diagram showing the relationship with a clock for extracting data from a signal having the above-mentioned signal format. In the figure, T0 to T1 are synchronization patterns, which are "3Fh". T1
T2 is an area for the first protocol, which allows data to be sampled at the rising edge of the clock. Therefore, the clock remains at the LOW level in the synchronization pattern (T0 to T1) where there is no data for the first protocol and in the area for the second protocol (T2 to T3). In the first protocol insertion circuit 75,
The data is transmitted at the timing shown in FIG. Similarly, T2 to T3 are areas for the second protocol, the synchronization pattern (T0 to T1) having no data for the second protocol, and the area for the first protocol (T1 to T1).
At T2), it remains at the LOW level. In other words, in the separation circuit 82 of the multiplexing / demultiplexing circuit 12, the data for the first protocol is transmitted to the communication protocol 4 at the clock and data timing shown in FIG. Sent to

Next, the case where the area for the first protocol and the area for the second protocol are separated from the 100th frame to the 200th frame during the communication will be described. First, in each of the mobile communication base station 1 and the host device 2, the CPU 11 sets a delimiter between the first protocol area and the second protocol area for the multiplexing unit of the multiplexing / demultiplexing circuit 12. Instruct to set to the 200th frame. Here, FIG. 7 is a conceptual diagram showing a configuration of a superframe before and after switching. In the multiplexing section of the multiplexing / demultiplexing circuit 12, the area from 1 to 1 that is the area for the first
The 100th frame is changed to the 1st to 200th frames.
That is, in the multiplexing unit of the multiplexing / demultiplexing circuit 12, since the insertion signal S3 from the comparator 78 is not supplied from the first frame to the 200th frame, the most significant bit of each frame is , An area identification bit “1” indicating an area for the first protocol is inserted, and the first protocol insertion circuit 75 inserts data for the first protocol into the lower 7 bits of each frame. The signals are sequentially transmitted to the transmission line 3 by the multiplexing circuit 77.

When the count value S1 of the counter 71 becomes "201", that is, at the 201st frame, the insertion signal S3 is supplied from the comparator 78 to the most significant bit insertion circuit 74. As a result, from the 201st frame to the 319th frame, the most significant bit of each frame is assigned by the most significant insertion bit circuit 74 to the area identification bit “0” indicating the area for the second protocol.
Is inserted. The lower 7 bits of each frame include
The second protocol insertion circuit 76 inserts data for the second protocol, and the multiplexing circuit 77
Are sent out sequentially. On the other hand, in the demultiplexing section of the multiplexing / demultiplexing circuit 12, since the demultiplexing circuit 82 constantly monitors the most significant bit, the superframe is switched to 1 to 200.
Extract data for the first protocol in the frame,
What is necessary is just to extract the data for the second protocol in the 01-319 frames.

Here, FIG. 8 shows the first state when the area is switched.
FIG. 4 is a conceptual diagram showing clock densities of the first protocol and the second protocol. In the first two superframes, the relationship is such that the data amount for the first protocol <the data amount for the second protocol, but from the next superframe, the area for the first protocol and the second By changing the size (separation position) of the protocol area, the relationship is such that the data amount for the first protocol <the data amount for the second protocol. Can be changed.

As described above, according to the present embodiment, the transmission rate of the communication can be changed without disconnecting the protocol link even during the communication. In the first protocol and the second protocol between the mobile communication base station 1 and the higher-level device 2, during communication, an area for the first protocol and an area for the second protocol are used according to the respective signal amounts. By changing the size of the area (separation position), one transmission line can be used efficiently.

C. Modification In the above-described embodiment, the area for the first protocol and the area for the second protocol are determined by the most significant bit of each frame. However, as shown in FIG. The identification data (1 byte) for identifying whether the area is the area for the first protocol or the area for the second protocol may be provided in the first frame in block units. In the example illustrated in FIG. 9, the first to twentieth frames are defined as the first block,
.., 81 to 100 frames are a fifth block, 101 to 120 frames are a sixth block,..., And 301 to 319 frames are a 16th block. Then, in the first to fifth blocks, the identification data of the first frame of each block is set to “0”, so that it is possible to identify that the data is for the first protocol.
From the block to the fifteenth block, the identification data of the first frame of each block is set to “1”,
It is possible to identify that the data is for the second protocol.

In the above-described embodiments and modified examples, an example in which two protocols are multiplexed has been described. However, it is needless to say that if there are two or more protocols, for example, three or four protocols may be used. Similarly, the transmission rate of the transmission path 3 is set to 64 kbps, but is not limited thereto.
Also, the configuration of the super frame may be other than 320 frames. Further, as synchronization protection detection, the forward 6
Although three stages and three rear stages are used, the number of protection stages is not limited to this.

[0036]

As described above, according to the present invention,
The following effects can be obtained. (1) The transmission rates of a plurality of protocols multiplexed on one transmission path can be flexibly changed, and the advantage is obtained that efficient communication can be performed according to the data amount of each protocol. (2) There is an advantage that the transmission rate can be changed without disconnecting the protocol link. (3) Since different transmission rates can be set for transmission and reception, there is an advantage that efficient communication can be performed when different amounts of data are transmitted and received in uplink and downlink.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a mobile communication base station device to which a variable transmission rate method in data transfer according to the present invention is applied and a higher-order device thereof.

FIG. 2 is a block diagram showing a schematic configuration of a multiplexing / demultiplexing unit 6 including a protocol.

FIG. 3 is a conceptual diagram showing a signal format of a multiplexed signal on a transmission line 3.

FIG. 4 shows a multiplexing section (multiplexing function) of the multiplexing / demultiplexing circuit 22.
FIG. 3 is a block diagram showing an example of the configuration of FIG.

FIG. 5 is a block diagram illustrating a configuration example of a demultiplexing unit (demultiplexing function) of the multiplexing / demultiplexing circuit 22.

FIG. 6 is a conceptual diagram showing a relationship with a clock for extracting data from a signal having a signal format.

FIG. 7 is a conceptual diagram showing a configuration of a superframe before and after switching.

FIG. 8 shows a first protocol and a second protocol at the time of area switching.
FIG. 3 is a conceptual diagram showing clock densities with the protocol of FIG.

FIG. 9 is a conceptual diagram showing a signal format of a multiplexed signal on a transmission path 3 according to a modification.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 base station apparatus 2 host apparatus 3 transmission line 4 communication protocol 5 communication protocol 6 multiplexing / demultiplexing unit 10 synchronization detection circuit 11 CPU 12 multiplexing / demultiplexing circuit 71 oscillator 72 counter 73 synchronization pattern insertion circuit 74 most significant bit insertion circuit 75 first Protocol insertion circuit 76 second protocol insertion circuit 77 multiplexing circuit 78 comparator 81 synchronization pattern detection circuit 82 separation circuit

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[Procedure amendment]

[Submission date] March 15, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Name of invention

[Correction method] Change

[Correction contents]

Patent application title: Multiplexing transmission device in multiplexed data communication

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction contents]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to multiplexing for multiplexing and transmitting data for a plurality of protocols on one transmission line .
The present invention relates to a multiplex transmission device in data communication.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction contents]

[0004] The present invention has been made in view of the above-mentioned circumstances, and it is possible to change a transmission rate according to the amount of communication signals without disconnecting communication, and to perform data communication with high efficiency. With the aim of providing a multiplexing transmission device for performing a variable transmission rate method in transmission
It has been the target.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method comprising the steps of:
A large frame having a size of
Of the transmission area for each of the plurality of signals within
The size is determined in units of the large frame, and the transmission area is determined.
A) To identify the transmission area based on the size of
Area identification information of the transmission area, and
In the frame, the plurality of signals are respectively
The rear identification information is transmitted together, and the transmitted data
Identify area identification information to identify the transmission area.
To determine which transmission area it is,
Extract signals from the time-series frames based on transmission area
Switch transmission area in multiplexed data communication
Frame switching value to indicate the position of the frame to be
And a frame supplied from the CPU.
Compare the clock switching value with the clock count value,
It is determined that the count value has reached the frame switching value
A comparator that outputs the area identification information on a condition that
And that the area identification information is supplied from the comparator.
Area identification bits in a given time-series frame
And a most significant bit insertion circuit for insertion.
I do.

Claims (4)

[Claims] In a data transfer for multiplexing and transmitting a plurality of signals on one transmission path, a transmitting side configures a large frame having a predetermined size composed of a plurality of time-series frames; Determining the size of a transmission area for each of the plurality of signals in a frame in units of the large frame; and generating area identification information for identifying the transmission area based on the size of the transmission area. And transmitting the plurality of signals together with the corresponding area identification information in a time-series frame of the transmission area. On the receiving side, area identification information for identifying the transmission area. Identifying the transmission area, and determining the transmission area based on the determined transmission area. Variable transmission rate method in the data transfer, characterized by a step of extracting a signal from the frame. 2. The variable transmission rate method in data transfer according to claim 1, wherein the area identification information is inserted into respective first bits of the plurality of time-series frames. 3. The large frame includes a plurality of blocks in which the plurality of time-series frames are grouped by a predetermined number, and the area identification information includes a first time-series frame in each of the plurality of blocks. 2. The variable transmission rate method in data transfer according to claim 1, wherein the variable transmission rate is inserted. 4. The variable transmission rate method in data transfer according to claim 1, wherein the plurality of signals are at least transmission / reception signals transmitted / received between a transmission side and a reception side. .