JPH07114391B2 - Transmission information monitoring method and apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for detecting an error in transmission information, and more particularly to a method for monitoring the identity of input / output information of an interface circuit through which transmission information passes and an apparatus for realizing this method.

[0002]

2. Description of the Related Art In an interface circuit through which transmission information (line data or the like) passes, an error occurs in output side information due to a failure or malfunction in the circuit. If the error in the transmission information cannot be detected and is processed as it is, the subsequent circuit is adversely affected. Therefore, in order to maintain good transmission quality, it is necessary to constantly monitor the presence or absence of the above information error.

As a transmission information monitoring method of this type, there is a method of determining the matching of monitoring patterns between the input and output of the interface circuit, for example. Conventionally, a fixed pattern of a predetermined number of bits (for example, 8 bits) is previously generated as a monitoring pattern, and this fixed monitoring pattern is inserted into an unused slot in the transmission information frame and input to the interface circuit. The output side of the interface circuit detects the fixed monitoring pattern and compares it with the original fixed monitoring pattern. If they do not match, it is determined that some failure has occurred in the interface circuit, and necessary measures such as information destruction are taken.

[0004]

As described above, according to the conventional information monitoring method, it is possible to easily detect the presence or absence of an information error in the interface circuit. However, since the above method only generates and compares a fixed monitoring pattern, it is easy to detect an information error due to a digital failure. However, noise or overshoot / undershoot ( It is very difficult to detect analog information errors such as malfunction due to (pattern effect), crosstalk between patterns, and influence due to reflection on the transmission line.

The present invention has been made under the above circumstances, and provides a transmission information monitoring method capable of detecting an analog information error such as noise due to the above pattern effect, and a transmission information monitoring apparatus for realizing this method. To provide.

[0006]

The transmission information monitoring method of the present invention for achieving the above object is a transmission information monitoring method of an interface circuit for inputting and outputting a transmission frame including an unused slot and a plurality of used slots. There, at least one used slot information is selectively extracted from the transmission data frame input to the interface circuit,
The extracted information is inserted into an unused slot of the frame to form a monitoring pattern, and the monitoring pattern in the transmission frame output from the interface circuit and the information of the unused slot corresponding to the monitoring pattern Are compared, and a transmission information error is generated when the two do not match.

Further, the transmission information monitoring apparatus of the present invention which achieves the above object, comprises an interface circuit for inputting and outputting a transmission frame including an unused slot and a plurality of used slots, and the above-mentioned interface circuit for inputting to the interface circuit. First information extracting means for selectively extracting at least one used slot information from the transmission frame, monitoring pattern forming means for inserting the extracted information into the unused slot to form a monitoring pattern, and this monitoring Second information extracting means for extracting information in slot units from the frame when a transmission frame including a pattern is output from the interface circuit, and the monitoring pattern and the monitoring in the extracted same transmission frame information Information that compares the information of the used slots corresponding to the pattern to determine the match between the two And having a compare means.

In the information monitoring device having the above structure,
The first information extraction means is a pulse generator that emits a pulse signal that becomes active for each slot, and based on the pulse signal, selectively extracts specific used slot information on the transmission frame in slot units. And a monitoring information forming means,
It includes an information insertion logic gate that inserts the output of the first information extraction circuit into an unused slot of the frame based on the pulse signal issued at a predetermined timing. Further, the second information extracting means delays the phase of the pulse signal received from the pulse generator by the processing time of the interface circuit and outputs the phase adjustment circuit, and a transmission frame output from the interface circuit. A second information extracting circuit for selectively extracting the information in the slot based on the output signal of the phase adjusting circuit, and the information comparing means includes the information inserting logic among the extracted information in the same transmission frame. It includes a consistency determination logic gate that determines the consistency between the information inserted by the gate and the information of the used slot corresponding to the insertion information based on the output signal of the phase adjustment circuit issued at a predetermined timing.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a block diagram of a main part of an information monitoring apparatus according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a structure of a transmission frame and a monitoring pattern used in this embodiment. In FIG. 1, 1 is a monitoring pattern generation unit, 2 is a monitoring pattern insertion gate, 3 is an interface circuit, and 4 is a monitoring pattern detection unit. Further, in FIG. 2, a indicates a slot structure of a transmission frame, b indicates a pulse signal issuing timing, and c indicates a control signal issuing timing.

The monitoring pattern generation unit 1 includes a pulse generator 10, a monitoring pattern extraction gate 11, a selection circuit 12, a shift register 13, and a monitoring pattern insertion position specifying gate 14, and each of these elements is provided. They are connected as shown in FIG.

The pulse generator 10 outputs a pulse signal which becomes active for each slot of the transmission frame as shown in FIG.
It sequentially outputs at the timing of c, and controls the AND gate 11 for selecting the monitoring pattern, the selection circuit 12, and the gate 14 for specifying the monitoring pattern insertion position, and the output thereof is guided to the phase adjusting circuit 40 described later.

The monitoring pattern extraction gate 11 is used for each piece of information (line data D1 ...
Dn-1, Dn) and the pulse signal are ANDed, and the monitoring pattern to be used is selected.

The selection circuit 12 and the shift register 13 are
The monitoring patterns output from the monitoring pattern extraction gate 11 are sequentially held. This monitoring pattern includes a control signal issued from the pulse generator 10 at the timing shown in FIG.
AND condition is taken in and the monitoring pattern insertion gate 2
Unused slot E of transmission frame via (OR gate)
Inserted in. The transmission frame in which the monitoring pattern is inserted is guided to the input section of the interface circuit 3 and is output again on the transmission line after a lapse of a predetermined processing time.

The monitoring pattern detecting section 4 includes a phase adjusting circuit 4
0, the monitoring pattern extraction gate 41, and the selection circuit 42
1, a shift register 43, and a monitoring pattern matching detection gate 44, and these elements are connected as shown in FIG.

The phase adjusting circuit 3 delays the output phase of the above-mentioned pulse generator 10 by the processing time of the interface circuit 3, and this is delayed by the monitoring pattern extracting gate 4.
1, selection circuit 42, monitoring pattern matching detection gate 44
The operation control of these is carried out. This allows
Processing such as information extraction can be performed at the same timing as the monitoring pattern generation unit 1.

The monitoring pattern extraction gate 41, the selection circuit 42, and the shift register 43 have the same functions as those used in the monitoring pattern generation unit 1, and the information on the transmission frame output from the interface circuit 3 is phased. Based on the output signal of the adjusting circuit 40, it is selectively extracted and held.

The monitoring pattern coincidence detection gate 44 inputs the output of the shift register 43, the information in the transmission frame output from the interface circuit 3, and the output signal of the phase adjusting circuit 40, and all the AND conditions thereof. To judge. That is, when the transmission frame output from the interface circuit 3 becomes a slot containing a monitoring pattern, the AND condition of this monitoring pattern and the information in the slot on which it is based is determined.

In this way, the information transmitted on the actual transmission line can be used as it is as the monitoring pattern, and an analog information error which cannot be detected by the conventional method using the fixed monitoring pattern, that is, It is possible to easily detect information errors due to noise such as real line data, malfunction due to overshoot / undershoot, crosstalk between patterns, and influence due to reflection on the transmission line.

The present invention is not limited to the above-mentioned embodiment, and the configuration can be arbitrarily changed without departing from the scope of the invention. For example, the information in the used slot used as the monitoring pattern may be a specific one, or a combination of a plurality of slots may be used appropriately.

[0021]

As is apparent from the above description, in the transmission information monitoring method of the present invention, the actually transmitted information is used as the monitoring pattern instead of the fixed monitoring pattern.
It is possible to detect an analog information error due to a randomly generated factor, and there is an effect that the monitoring accuracy is significantly improved as compared with the conventional one.

Further, according to the transmission information monitoring apparatus of the present invention, it is possible to easily implement the above method, and it is possible to perform monitoring over the entire function including the occurrence of a failure inside the interface circuit or the transmission line itself. is there. Since this device can be configured with general-purpose components such as logic gates,
It is also advantageous in terms of cost.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a transmission information monitoring device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of the structure of a transmission frame used in this embodiment and the emission timings of pulse signals and control signals.

[Explanation of symbols]

 1 Monitoring Pattern Generation Unit 2 Monitoring Pattern Insertion Gate 3 Interface Circuit 4 Monitoring Pattern Detection Unit 10 Pulse Generator 11,41 Monitoring Pattern Extraction Gate 12,42 Selection Circuit 13,43 Shift Register 14 Monitoring Pattern Insertion Position Designation Gate 44 Monitoring Gate for pattern matching detection

Claims (4)

[Claims] 1. A method for monitoring transmission information of an interface circuit for inputting and outputting a transmission frame including an unused slot and a plurality of used slots, wherein at least one of the transmission data frames input to the interface circuit is used. The information in the used slot is selectively extracted, and the extracted information is inserted into an unused slot of the frame to form a monitoring pattern, and the monitoring pattern and the monitoring pattern in the transmission frame output from the interface circuit are used. A transmission information monitoring method characterized by comparing the information of corresponding used slots and making a transmission information error when the two do not match. 2. An interface circuit for inputting and outputting a transmission frame including an unused slot and a plurality of used slots, and at least one used slot information is selectively extracted from the transmission frame input to the interface circuit. First information extracting means, monitoring pattern forming means for forming a monitoring pattern by inserting the extracted information into the unused slot, and a transmission frame including the monitoring pattern is output from the interface circuit. In the second information extraction means for extracting information in slot units from the frame, and in the extracted same transmission frame information, the monitoring pattern is compared with the information of the used slot corresponding to the monitoring pattern. A transmission information monitoring device, comprising: an information comparison unit that determines the matching between the two. 3. The information monitoring device according to claim 2,
The first information extraction means is a pulse generator that emits a pulse signal that becomes active for each slot, and based on the pulse signal, selectively extracts specific used slot information on the transmission frame in slot units. And a monitoring information forming means,
A transmission information monitoring apparatus comprising: an information insertion logic gate that inserts an output of the first information extraction circuit into an unused slot of the frame based on the pulse signal issued at a predetermined timing. 4. The transmission information monitoring device according to claim 3, wherein the second information extracting means delays the phase of the pulse signal received from the pulse generating device by the processing time of the interface circuit and outputs the phase. The information comparing means includes an adjusting circuit and a second information extracting circuit for selectively extracting information on the transmission frame output from the interface circuit on a slot basis based on the output signal of the phase adjusting circuit. Among the information in the same transmission frame, the output signal of the phase adjustment circuit which issues the consistency between the information inserted by the information insertion logic gate and the information of the used slot corresponding to the inserted information at a predetermined timing. A transmission information monitoring device comprising a logic gate for coincidence determination based on the above.