JPH08293847A - Communication controller, communication control method and communication control system - Google Patents

Abstract

PURPOSE: To execute initialization by means of a controller itself so as to facilitate transmission/reception by judging the frame type of communication data and judging the container type of communication data based on the detection result of special information. CONSTITUTION: An A1/A2 byte detection circuit 8 detects a bit string equivalent to A1 byte among reception data of a data bus 1. When an A1 byte string is detected, a judgement circuit 9 increases an A1-counter 10 and counts the number of A1 bytes by receiving the notice. When A2 byte is detected, the circuit 9 increases an A2-counter 11, and counts the number of A2 bytes. When bytes except for A1 byte and A2 byte are detected, the A1-counter and the A2-counter are reset. The notice of a compared result is received from a comparison circuit 12 comparing the values of the counters 10 and 11. When they are matched, it is judged that a frame synchronizing pattern is detected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronous digital hierarchy in a communication terminal.
The present invention relates to a communication control device that automatically determines the frame type and container type of data received in a frame format such as erarchy (SDH). In addition, if the line type such as the frame type and container type is not determined, simply connect the device to the line to automatically perform the initial setting according to the line, and the communication control that enables communication Regarding the system.

Broadban Integrated Services Digital Network Broadban
d aspects of Integrated Services Digital Network
In a communication system such as (B-ISDN), an SDH interface is adopted as an interface that defines the bit rate of data transmitted on a transmission path.
SDH is an international telecommunication union-telecomm standardization division for the purpose of multiplexing communication services of various bit rates from the existing low bit rate to the future high bit rate.
This is a world standard interface standardized by the unication Standardization Sector (ITU-T) (formerly CCITT). In Japan, the Telegraph and Telephone Technical Committee Telecommunication
Technology Committee (TTC) has its own ITU-T
It is specified as a domestic standard interface by adding a bit rate stage that is not in the standard.

In the SDH interface, the bit rate of transmitted data is specified according to the type of frame. FIG. 8 shows an ST having a bit rate of 155.52 Mbps, which is a basic speed in SDH of ITU-T standard.
The structure of the M-1 frame and the method of multiplexing from the existing low bit rate are shown.

In FIG. 8, one frame is composed of 9 rows vertically and 270 columns horizontally, with 1 byte as a unit, and data is sent in the rows from left to right. Section overhead Se
The ction overhead (SOH) contains information for communication maintenance and management. The right side is the asynchronous transfer mode
A virtual container (V) that stores actual data such as Asynchronous Transfer Mode (ATM) cells.
It is stored in C). The VC is like a box that stores existing low-speed data, etc., and has a standardized bit rate (VC-3: 48.960 Mbps, VC-
4: 150.336 Mbps). Information for managing a container called Path Overhead (POH) is added to the first column of the VC.

Synchronous Transport Module-1 Sy
In the case of an nchronous Transport Module-1 (STM-1) frame, one VC-4 container or three VC-3 containers are multiplexed by a byte interleave method to form a frame. At this time, since the number of bytes in the payload part of STM-1 is larger than the number of bytes in which three VC-3s are combined, when three VC-3s are multiplexed,
Stuffing called a stuff byte is made in the gap of the STM-1 payload.

FIG. 9 shows a TTC standard SDH multiplexing flow.

In FIG. 9, STM-1 is the basic frame of the bit rate even in SDH of the TTC standard. A higher-order frame is made by multiplexing N pieces of STM-1 and is called STM-N. This bit rate is 155.52 × NMbps (N is an integer).

As mentioned above, in the Japanese TTC standard, S
In addition to the bit rate system obtained by multiplexing TM-1, another low speed frame is provided. This is a multiplexing of only one VC-3 as shown in FIG. 9, and has a bit rate of 51.84 called STM-0.
It is a frame of Mbps. This frame is one-third the size of STM-1 as shown in FIG.

The communication data thus configured is transmitted in the frame format on the transmission path and received by the communication terminal. The part adjacent to the line of the communication terminal corresponds to the part called the lowest physical layer in the hierarchical structure of the protocol. At the physical layer, S is received from the received frame.
OH, POH and stuff bytes are removed, and pure data portion (eg, ATM cell in ATM communication)
Only extract and send to higher layers. These processes (frame disassembling process) are performed according to the type of received frame (STM-
0, STM-1, ..., And type of container (VC-
3, VC-4). For example, in STM-0, as shown in FIG. 10, 87 payload bytes including a stuff byte are sent following 3 SOH bytes. In STM-1, as shown in FIG.
261 payload bytes are sent following the 9 SOH bytes.

Since such a difference occurs, the method of frame disassembly processing must be changed according to the types of the received frame and the container. For that purpose, it is necessary to change the instruction program given to the processor inside the physical layer that controls the hardware for frame disassembly processing according to the types of the received frame and the container. Therefore, when connecting a communication terminal to a line and starting communication,
The user must download a program for frame disassembly processing or frame assembly processing in the transmission system from the external memory to the program memory inside the physical layer by the host CPU outside the physical layer LSI. However, for that purpose, the user must previously recognize the frame type and container type of the data on the communication line for the reason described above.

Further, Japanese Patent Publication No. 7-14156 discloses a synchronous multiplex transmission system capable of handling a plurality of types of signals (virtual containers) in the same multiplex transmission system while maintaining compatibility. That is, the virtual container in the transmission frame can be discriminated by identifying the pattern held by the pointer, and the service in the received signal can be identified, thereby enabling separation corresponding to the service. Further, it stores the AU pointer information one frame before, and stores that information together with the currently received administrative unit Administrative U.
By adding a pointer process of comparing nit pointer (AU pointer) patterns and a highly reliable pointer translation function, two or more types of services can be realized with the same method while maintaining compatibility. .

[0012]

As described above, in the communication control device that handles the communication data in the above format, it is premised that the user of the communication terminal recognizes the frame type of the data on the line in advance. . However, when both the frame type and the container type are variable and data is transmitted, or when these types are not recognized in advance, the user of the communication terminal selects the frame type and container type of the data on the line. If both are not recognized in advance, the initial setting (download of the program) required for the frame disassembly / assembly process of the physical layer LSI cannot be performed, which causes a problem that communication cannot be performed.

Further, since it is necessary for the user to perform the initial setting itself, it takes time and effort. This problem has been an obstacle to the development of communication devices that can be easily used by general users who have little knowledge of computers and the like.

The present invention has been made in view of the above, and an object of the present invention is to perform communication control for facilitating transmission / reception by the apparatus itself determining the type of a frame and a container of communication data. To provide a device. In addition, the device itself determines the types of frames and containers of communication data, and the device itself performs the initial settings necessary for processing such as frame disassembly and assembly, thereby providing a communication control system that facilitates transmission and reception. is there.

[0015]

In order to achieve the above object, in a communication control apparatus and method of the present invention, according to the contents of information constituting communication data among communication data communicated in a frame format. The determination information for determining the frame type is detected, the frame type of the communication data is determined based on the detected determination information, and the content of the information forming the communication data from the communication data communicated in the frame format The determination information for determining the container type is detected according to the above, and the container type of the communication data is determined based on the detected determination information.

Further, in the communication control system of the present invention, among the communication data communicated in the frame format,
Detects the judgment information that judges the frame type according to the content of the information that makes up the communication data, judges the frame type of the communication data based on the detected judgment information, and From this, the judgment information that judges the container type according to the content of the information that constitutes the communication data is detected, the container type of the communication data is judged based on the detected judgment information, and the judged frame type and container type The communication data frame processing program corresponding to is selected, and the communication data frame processing is executed according to the selected program.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the configuration of a communication control apparatus according to an embodiment of the present invention.

First, before explaining the configuration of this embodiment, the principle of determining the frame type and container type of communication data will be described.

FIG. 2A shows the SOH of the STM-0 frame.
Of the STM-1 frame in FIG. 2B.
Indicates the contents of OH.

In FIG. 2B, the bytes marked with * are unscrambled bytes, the bytes marked with X are undefined bytes reserved for domestic use, and the blank bytes are. Undefined bytes reserved for future international standardization.

In FIG. 2A and FIG. 2B, SO
By using a specific byte in H, the frame type and container type are determined. A
Bytes 1 and 2 are fixed bytes for frame synchronization and have values of F6H and 28H, respectively. The number is S
In TM-0, one A1 and one A2 byte are used for STM.
In -1, there are three each. Therefore, the type of frame can be determined by checking the number of A1 and A2 bytes. If the frame type is determined, by performing backward protection synchronization according to the frame length,
The determination of the frame type can be made more accurate.

Next, a method of determining the container type will be described.

First, in the case of STM-0, since the container to be stored is limited to VC-3, if the type is judged to be STM-0, the type of container is uniquely determined. Next, in the case of STM-1, attention is paid to the byte described as the AU pointer. The AU pointer points to the head position of the container multiplexed in the frame. To determine the container type, in the case of STM-1,
The previous 6 bytes in the AU pointer are required. Here, the case of STM-1 will be described as an example, but it is easy to extend this to the case of STM-N.

FIGS. 3A to 3E show the structure of 6 bytes before the STM-1 AU pointer. In the figure, H1 =
(1001SSXX) or (0110SSXX), Y =
(1001SS11), H2 = (XXXXXXXXXX),
It represents 1 * = (11111111). Where SS = 1
0 and X are non-fixed bits for indicating the top position of the container. Further, I is a byte defined in the present invention, and is, for example, (10000000).

The configuration shown in FIG. 3 (A) is an AU pointer for multiplexing one VC-4. In this case H
Since only one pair of 1 and H2 bytes is required, Y byte and 1 * byte are put in the remaining portion.

FIG. 3B shows the structure of the AU pointer when three VC-3s are multiplexed. With this configuration, the 1 (2, 3) th H1 byte from the left and 4 from the left
The (5, 6) th H2 bytes form a pair and display the start position of the first (second, third) container.
For example, if the last 2 bits of the first H1 byte from the left and the 8 bits of the fourth H2 byte from the left are combined into 10 bits (the above-mentioned bit marked with X), 0
To 782 (decimal) (87x9 = 7)
83), the top position of the first container is displayed by this value. The top position is similarly displayed for the second and third containers.

The configuration shown in FIGS. 3 (C)-(E) is I
Although not specified in any of the TU-T and TTC standards, it is an AU pointer corresponding to a possible container multiplexing format. FIGS. 3C and 3D show a case where only one VC-3 container is loaded in the STM-1 frame. Also, FIG. 3 (E)
Is a case where two VC-3 containers are loaded.

H1, H2, which appear in the AU pointer,
By looking at the combination of Y, 1 *, and I bytes,
The type of container can be determined. There are three combinations of pairs of bytes (for example, the first and fourth bytes from the left): (H1, H2), (Y, 1 *),
(Y, I) is defined and there is no risk of these being confused with each other. To be more precise, the I byte is defined so as not to be confused according to the conditions described later. Therefore, by observing which combination of these pairs appears at which position of the AU pointer, it is possible to determine which container is contained and how many.

Here, as can be seen from the bit configuration of H1, H2, Y, and 1 * byte, the H1 byte and the Y byte, and the H2 byte and the 1 * byte can take the same value, so that (H1, There is no distinction between the (H2) pair and the (Y, 1 *) pair, and just looking at these bytes results in FIG. 3 (A).
It seems that the case and the case of FIG. 3B cannot be distinguished. But that is not the case. This is because the value (1111111111), which is the sum of the last 2 bits of the Y byte and the 1 * byte, exceeds 782 (decimal number) and cannot be a value of (H1, H2) pair. From these, the (H1, H2) pair and (Y,
I) To make a distinction from a pair, the definition of the I byte must satisfy the following conditions. In other words, 10 bits including the last 2 bits (11) of the Y byte and the I byte must exceed 782 (decimal conversion). As long as this condition is met, I
The definition of bytes is arbitrary.

The above is the essential description of the container type determination method. Next, the exceptional operation of the AU pointer will be described.

Exceptional operations are AU pointer increment processing and decrement processing. If the minute phase difference between the clock of the physical layer and the clock of the upper layer that exchanges data with the physical layer is accumulated to a size that cannot be ignored, the physical layer transmission side stores the payload bytes. Take in one SOH at a predetermined location and shift all subsequent data one byte before, or insert one blank byte into the payload and shift all subsequent data one byte backward, Adjust the phase difference. Specifically, in the former case, the value of the AU pointer is decremented by 1, and in the latter case, the value is incremented by 1. Then, in order to notify the physical layer on the receiving side that these processes have been performed, in the case of decrementing, the 8th bit from the H1 byte before the AU pointer in the frame and the H2 byte 2, 4, 6, , 8
The bit is inverted and sent, and in the case of increment, the 7th bit from the front of the H1 byte and 1 of the H2 byte
The 3rd, 5th and 7th bits are inverted and transmitted.

When an AU pointer having an inverted bit is received due to such exceptional processing, there is a possibility that the byte in it cannot be read, or it may be read incorrectly as another byte. . To avoid these,
The AU pointer is checked for two frames, and if they are the same, the container type is determined based on the contents, and if the contents of the AU pointer are different, it is assumed that the increment or decrement processing has been performed. After the contents of the AU pointers of two consecutive frames become the same, the container type is determined.

The point of the container type determination is to extract the data having the information about the container type from the received data and decode the data to determine the container type. Therefore, any data may be used as long as it has information about the container type, not limited to the byte of the AU pointer. For example, if the transmitting side writes the container type in an undefined byte in the SOH and then transmits it, the receiving side can read it and determine the container type. This also applies to the frame type determination.

Next, returning to FIG. 1, the configuration of this embodiment will be described.

In FIG. 1, reference numerals 1 and 2 are data buses for transmitting received data. Reference numeral 3 is a frame type determination circuit, and 4 is a container type determination circuit. Received data flows from the data bus 1 toward the data bus 2.
Reference numeral 5 is a signal line for notifying the outside of the frame type determined by the frame type determination circuit 3. Reference numeral 6 is a signal line for notifying the container type determination circuit 4 that frame synchronization has been established in the frame type determination circuit 3. Reference numeral 7 is a signal line for notifying the outside of the container type determined by the container type determination circuit 4.

FIG. 4 shows the frame type decision circuit 3 shown in FIG.
It is a figure which shows the specific structural example of. In FIG. 4, reference numeral 8 denotes a detection circuit having a signal line for detecting A1 byte or A2 byte from the reception data of the data bus 1 and notifying which of them is the detection circuit. Reference numeral 9 is a determination circuit for determining the frame type and performing control related thereto.
Reference numerals 10 and 11 are an A1 byte counter and an A2 byte counter for counting the number of times the A1 byte and the A2 byte are detected, respectively. Reference numeral 12 is a comparison circuit having a signal line for comparing the value of the A1 byte counter and the value of the A2 byte counter and notifying that the values match. Thirteen
Is a signal line for transmitting a sync pattern detection signal for notifying that the frame sync pattern has been detected at the correct timing. Reference numeral 14 is a frame type signal line for notifying the frame type determined by the determination circuit 9. Reference numeral 15 denotes a backward protection counter, which receives the notification from the signal line 13 and counts the number of detections of the frame synchronization patterns that have occurred consecutively. Reference numeral 16 is a frame synchronization signal line for notifying that the value of the backward protection counter 15 has reached the specified backward protection stage number.

Next, the operation of the above configuration will be described with reference to the flowchart (algorithm) of FIG.

First, from the received data on the data bus 1, the A1 and A2 byte detection circuit 8 detects a bit string (F6H) corresponding to the A1 byte (step S1). When the A1 byte is detected, the determination circuit 9 receives the notification and increments the A1 counter 10 that counts the number of A1 bytes (step S2). If the next byte is the A1 byte continuously, the increment of the A1 counter 10 is continued. When the "other" bytes other than the A1 and A2 bytes are detected, the determination circuit 9
Assumes that the bytes detected so far were not part of the sync pattern, resets the A1 counter and returns to the beginning of the algorithm again.

On the other hand, if the A2 byte is detected after the A1 byte (step S3), the determination circuit 9 increments the A2 counter 11 (step S4). Then, the comparison circuit 12 for comparing the value of the A1 counter 10 and the value of the A2 counter 11 receives the notification of the comparison result. If the values do not match in the comparison result (A1 counter value ≠ A2 counter value) (step S5), it is checked whether or not the next byte is A2 byte (step S6). If it is A2 byte, the A2 counter 11 is set. Increment (step S4) and check the comparison result again (step S4).
5).

If the two counter values match each other (A1 counter value = A2 counter value), it is determined that the frame synchronization pattern has been detected.
On the other hand, if bytes other than A2 bytes are detected before the number of A1 bytes and the number of A2 bytes are equal, it is considered that the detected A1 and A2 bytes are not part of the synchronization pattern, and the algorithm is Return to the top of.

When the frame synchronization pattern is detected, the judgment circuit 9 counts up the A1 counter value (step S7). If the A1 counter value is 1, the frame type is STM-0 frame, while the A1 counter value is If it is 0, it is determined that the frame type is the STM-1 frame. Then, a frame type signal corresponding to the number of A1 counter values is output from the signal line 14 (step S
8). At the same time, the synchronization pattern detection signal is sent to the signal line 13
To the rear protection counter 15 via (step S
9). In the backward protection counter 15, if the synchronization pattern detection signal is continuously transmitted a prescribed number of times (the number of backward protection stages), it is considered that the frame synchronization has been determined, and a high level frame synchronization signal is output to the frame synchronization signal line 16. To do.

FIG. 6 shows the container type judging circuit 4 shown in FIG.
It is a figure which shows the structural example.

In FIG. 6, reference numeral 17 denotes a shift register, which takes out and stores a necessary bit in the AU pointer. Reference numeral 18 is a decoder which decodes the bits stored in the shift register 17 to determine the type of bytes forming the AU pointer. Reference numeral 19 denotes a selection circuit, which outputs the output of the decoder 18 to the shift register 20a or 2
It is output to either one of 0b. Reference numeral 21 is a comparison circuit, which compares the outputs of the shift register 20a and the shift register 20b and outputs a high-level match signal to the signal line 22 if they match. A gate circuit 23 outputs the output of the shift register 20b to the signal line 24 for notifying the container type when the signal line 22 is at a high level. 25
Is a control circuit, receives the frame type signal and the frame synchronization signal from the frame type determination circuit 3, and receives the decoder 18
Receives the decoding result from the comparator circuit 21, receives the comparison result from the comparison circuit 21, and controls the operations of the shift register 17, the selection circuit 19, the shift registers 20a and 20b, and the comparison circuit 21.

In such a configuration, when the frame type determination circuit 3 notifies the frame synchronization signal indicating that the frame synchronization is established via the signal line 27, the control circuit 25 starts the operation and the signal line 26. The control is performed according to the frame type notified via.

First, the shift register 17 takes out a necessary bit of the AU pointer from the data bus 2 and stores it. As explained in the principle of container type determination,
The bits to be stored are the last 2 bits of each byte for the 3 bytes before the AU pointer, and all the bits of each byte for the following 3 bytes. Therefore, the shift register 17 has a total of 30 bits (10 bits x 3
Pairs) are stored.

The decoder 18 determines from the contents of the shift register 17 to A according to the method described in the principle of container type determination.
The configuration of the U pointer is read using H1, H2, Y, 1 *, and I bytes, and the temporary container type is output. If the AU pointer is incremented or decremented, the bit determination determines whether the AU pointer has H1 or H.
None of the 2, Y, 1 *, and I bytes may be legible. In such a case, the decoder 18 notifies the control circuit 25 that it could not be read, and the control circuit 25 restarts the reading operation from the next frame.

On the other hand, even if the data can be read, there is still a possibility of misreading due to bit inversion. Therefore, it is confirmed whether the temporary container type output from the decoder 18 is correctly judged. Therefore, the selection circuit 19 first outputs the output of the decoder 18 in the frame to the shift register 20a, and outputs the output of the decoder 18 in the next frame to the other shift register 20b.

The comparison circuit 21 may compare the contents of the shift register 20a and the contents of the shift register 20b, and if they match, it may determine that the increment and decrement processing has not been performed, so the container type is correct. Is judged to have been determined, and a high-level coincidence signal is output to the signal line 22. Thereby, the gate circuit 23
Opens, and the container type stored in the shift register 20b is output via the signal line 24.

Next, FIG. 11 shows a communication control device having a notification means. Reference numeral 111 denotes a frame / container type determination circuit, which corresponds to the circuit shown in FIG. 112 is
It is a notification means and is a frame / container type determination circuit 11
This is an interface for inputting the frame type and the container type which are the outputs of 1 and transmitting them to the outside. Notification means 1
Reference numeral 12 may include a conversion circuit for signal format conversion, parallel-serial conversion, or the like, or may be configured by a plug, a connector, or the like. An external device 113 can effectively use the output frame type and / or container type by being configured by a computer including a CPU and the like. As the external device 113, an LED, a liquid crystal panel, a C
A visual device such as RT or an audible display device may be provided. Furthermore, as the external device 113, a desired device such as an output device such as a printer and a storage device such as a floppy disk drive or a hard disk drive can be appropriately connected.

FIG. 7 is a diagram showing the configuration of a communication control system according to another embodiment of the present invention.

The embodiment shown in FIG. 7 uses the communication control device provided with the above-described frame and container type determination circuit to automate communication control for initializing the physical layer required when starting up a communication terminal device. 1 is an example of a system.

Reference numeral 28 denotes a communication device, which can be integrated into an LSI. As the constituent parts to be integrated into an LSI, desired constituent parts other than those shown in FIG. 7 can be appropriately selected and integrated.

In the communication control device 28, 29, 30,
Reference numeral 31 is a reception data bus. A frame / container type determination circuit 32 corresponds to the circuit shown in FIG. Three
Reference numerals 3 and 34 are signal lines for notifying the frame type signal and the container type signal, respectively. Reference numeral 35 is a host CPU that totally controls the entire communication terminal device outside the physical layer LSI that serves as a communication control device, and 36 is an external memory. Reference numeral 37 is a received data processing circuit for processing received data in the physical layer, and corresponds to, for example, a received frame processing unit. Reference numeral 38 is a processor for controlling the received data processing circuit 37, and 39 is a program memory for storing an instruction program given to the processor 38.

In such a configuration, the frame / container type determination circuit 32 establishes frame synchronization from the received data from the data bus 29, determines the frame type and the container type, and determines the frame type signal 33 and the container type signal 34. To the host CPU 35. Host C
The PU 35 instructs the external memory 36 to download the processing program corresponding to the determined frame type and container type to the program memory 39 inside the communication control device. The processor 38 controls the frame decomposition processing and the like in accordance with this instruction program, and the received data processing circuit 3
Do for 7. Even when the frame assembling process is performed, the frame assembling process is performed using the program for the frame assembling process. At this time, the user only has to insert the plug of the terminal device into the socket of the communication line.

Therefore, the terminal device itself automatically determines the frame type and container type of the data flowing through the line,
By notifying the host CPU to download the data processing program according to the determined type,
It becomes possible to automate the initial setting of the physical layer which the user had to do so far. This allows
The operation required when the user starts communication is significantly reduced, and even a general user who has little knowledge in this field can start communication very easily.

[0057]

As described above, according to the present invention, the apparatus is provided with the frame type determination circuit for determining the frame type and the container type determination circuit for determining the container type.
The device itself can determine the frame type and the container type. Therefore, the user does not need to operate to determine the frame type and container type,
Further, it is not necessary to negotiate the frame type and the container type in advance before communication and notify the receiving side, and it becomes possible to automate the determination of the frame and the container type of the communication data. Furthermore, communication can be started very easily on the transmitting side and the transmitting side, and simplification of transmission and reception can be achieved.

Further, according to the present invention, a frame processing program corresponding to the determined frame type and container type is read out, and according to the read program, frame processing such as frame disassembly and assembly of received data is performed. It is possible to automate the necessary initial settings.

Further, according to the present invention, when the structure of the information for judging the container type of consecutive frames matches, the information is judged to be correct information, so that the information for judging the container type is an exception. It is possible to accurately determine the container type even when the target processing is performed.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a communication control device according to an embodiment of the present invention.

FIG. 2 (A) is a diagram showing the SOH structure of an STM-0 frame, and FIG. 2 (B) is a diagram showing the SOH structure of an STM-1 frame.

3A to 3E are diagrams showing a structure of 6 bytes before an AU pointer of STM-1.

FIG. 4 is a diagram showing a configuration of a frame type determination circuit shown in FIG.

5 is a diagram showing a flowchart of a frame type determination circuit shown in FIG.

FIG. 6 is a diagram showing a configuration of a container type determination circuit shown in FIG.

FIG. 7 is a diagram showing a configuration of a communication control system according to another embodiment of the present invention.

FIG. 8 is a diagram showing a structure of an STM-1 frame.

FIG. 9 is a diagram showing an SDH interface multiplexing method in the TTC standard.

FIG. 10 is a diagram showing the structure of an STM-0 frame.

FIG. 11 is a diagram showing a configuration of a communication control device according to an embodiment of the present invention, which is provided with a notification means.

[Explanation of symbols]

 1, 2 Data Bus 3 Frame Type Judgment Circuit 4 Container Type Judgment Circuit 8 A1, A2 Byte Detection Circuit 9 Judgment Circuit 10 A1 Byte Counter 11 A2 Byte Counter 12, 21 Comparison Circuit 15 Rear Protection Counter 17, 20a, 20b Shift Register 18 Decoder 19 Selection circuit 24 Gate circuit 28 Communication control device 32 Frame, container type determination circuit 35 Host CPU 36 External memory 37 Received data processing circuit 38 Processor 39 Program memory

Claims (17)

[Claims] 1. A first detecting means for detecting first specific information of communication data transmitted in a frame format, and a frame type of the communication data is determined based on a detection result of the first detecting means. A first determining means; a second detecting means for detecting second specific information of the communication data transmitted in a frame format; and a container type of the communication data based on a detection result of the second detecting means. A communication control device having a second determination means for determining. 2. A frame type determining means for determining a frame type of the communication data based on the specific information forming the communication data; and a frame type determining means for determining the frame type of the communication data based on the specific information forming the communication data. Container type determination means for determining the container type; storage means for storing a processing program corresponding to the frame type of the communication data and the container type; and the storage according to the frame type and the container type determined by each of the determination means A communication control system comprising: control means for selecting a processing program stored in the means; and processing means for controlling communication data based on the processing program. 3. The frame type determination means includes first detection means for detecting first specific information of communication data transmitted in a frame format, and the communication based on a detection result of the first detection means. A first determination unit that determines a frame type of data, wherein the container type determination unit detects a second identification information of communication data transmitted in a frame format; The communication control system according to claim 2, further comprising a second determination unit that determines a container type of the communication data based on a detection result of the second detection unit. 4. The first detecting means detects two types of frame synchronization information from the control information of the communication data, and the first determining means detects the two types of frame synchronization information detected by the first detecting means. The communication control device according to claim 1, or the communication control system according to claim 3, wherein the frame type is determined based on the type of frame synchronization information and a frame type signal is output. 5. The frame format comprises a Synchronous Digital Hierarchy (SDH) frame structure, wherein the first detecting means: obtains first and second frame synchronization information from a section overhead (SOH) of each frame. A first detecting means for detecting the number of detection times of each of the first and second frame synchronization information detected by the first detecting means; When the count values of the frame synchronization information of 2 are equal, it is determined that the frame synchronization pattern is detected, and the first determination unit that outputs the frame type signal of the synchronous transmission module (STM) corresponding to the count value is provided. The communication control device according to claim 1 or the communication control system according to claim 3. 6. The first determination means: counts the number of times the frame synchronization pattern is detected when the frame synchronization pattern is detected, and detects the frame when the count value of the frame synchronization pattern reaches a predetermined number. The communication control device or the communication control system according to claim 5, further comprising a second determination unit that determines that synchronization has been determined and outputs a frame synchronization signal. 7. The second detecting means detects information indicating a data head position from the control information of the communication data, and the second judging means detects the data detected by the second detecting means. 4. The communication control device according to claim 1, or the communication control system according to claim 3, wherein an array configuration of information indicating a head position is determined, and a container type corresponding to the determined array configuration is output. . 8. The second detecting means detects instruction information indicating a data head position from the control information of the communication data, and the second judging means outputs the frame output by the first judging means. On the basis of the type signal and the information indicating the data start position detected by the second detecting means, the array configuration of the information indicating the data start position is determined,
The communication control device according to claim 1 or the communication control system according to claim 3, wherein a container type corresponding to the determined array configuration is output. 9. The frame format comprises an SDH frame structure, and the second detecting means comprises: a detecting section for detecting a pointer indicating a data head position from the SOH of each frame; the second determining means. Is provided with a third determination unit that determines the array configuration of the pointers detected by the second detection means and determines the container type of the virtual container corresponding to the combination of the array information. The communication control device according to claim 1 or the communication control system according to claim 3. 10. The second determination means includes: a first storage unit for storing container type information determined by the third determination unit for a certain frame; and a third determination for the next frame. A second storage unit that stores the container type information determined by the unit, a comparison unit that compares the container type information stored in the first and second storage units, and if the comparison results match, receive The communication control device or the communication control system according to claim 9, further comprising: an output unit that determines that the container type of the data frame is accurately determined and outputs the container type. 11. The frame format comprises an SDH frame structure, and the first detection means comprises: a detection unit for detecting frame type information from an undefined area in SOH of each frame; The communication control device according to claim 1, wherein the determination means includes: a determination section that outputs an STM frame type signal corresponding to the frame type information detected by the first detection means. Item 3. The communication control system according to Item 3. 12. The frame format comprises an SDH frame structure, and the second detection means comprises: a detection unit for detecting container type information from an undefined area in SOH of each frame; the second determination. The means includes: a communication control device according to claim 1, or a communication control device according to claim 3, further comprising: a determination unit that determines a container type of a virtual container corresponding to the container type information detected by the second detection means. The communication control system according to. 13. The communication control apparatus according to claim 1 or the communication control system according to claim 3, further comprising notifying means for notifying the frame type and / or the container type to the outside. 14. A first detection step of detecting first specific information of communication data transmitted in a frame format, and a frame type of the communication data is determined based on a detection result of the first detection step. A first determination step; a second detection step of detecting second specific information of communication data transmitted in a frame format; and a container type of the communication data based on a detection result of the second detection step. A second control step of determining the communication control method. 15. The first detection step detects two types of frame synchronization information from the control information of the communication data, and the first determination step includes the two pieces of frame synchronization information detected by the first detection step. 15. The communication control method according to claim 14, wherein the frame type is determined based on the type of frame synchronization information and a frame type signal is output. 16. The second detection step detects information indicating a data head position from control information of the communication data, and the second determination step includes the data detected by the second detection step. 15. The communication control method according to claim 14, wherein the arrangement configuration of the information indicating the head position is determined, and the container type corresponding to the determined arrangement configuration is output. 17. The communication control method according to claim 14, further comprising a notification step of notifying the frame type and / or the container type to the outside.