JP2800887B2 - Device path monitoring method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-device path monitoring method, and more particularly to an in-device path monitoring method for monitoring valid data in an ATM device.

[0002]

2. Description of the Related Art This type of in-device path monitoring system is disclosed in, for example, Japanese Patent Application Laid-Open No. 5-95387 (hereinafter referred to as Prior Art 1). FIG. 4 shows an in-device path monitoring method having substantially the same configuration as that disclosed in Prior Art 1. In the in-device path monitoring method, the monitoring is performed by a transmitting unit 10 'that transmits monitoring data to the monitored object 30' and a receiving unit 20 'that receives data output from the monitored object 30' as received data. This is for monitoring the internal path of the target 30 '.

The transmitting unit 10 'comprises an address generating means 11', a first inserting means 12 ', a sampling means 13', and a second
And insertion means 14 '. The address generating means 11 'generates address data indicating the position of the time slot to be monitored within one frame of the framed input signal in synchronization with the frame pulse signal. The first inserting means 12 'inserts address data into a first time slot in one frame of the input signal in synchronization with the frame pulse signal, and outputs the first inserted data. The sampling means 13 'detects the data of the time slot indicated by the address data from the first inserted data and generates sample data in synchronization with the frame pulse signal. The second inserting means 14 'inserts the sample data into the second time slot in one frame of the first inserted data, and transmits the second inserted data to the monitored object 30'. That is, the transmitting unit 10 '
Transmits the transmission data in which the address data and the sample data are inserted into the input signal by the first and second insertion means 12 'and 14' to the monitored object 30 '.

[0004] A receiving section 20 'for receiving data output from the monitored object 30' as received data includes a first detecting means 21 ', a second detecting means 22', and a third detecting means 2 '.
3 'and comparison means 24'. First detecting means 21
'Detects address data as the first detection data from within one frame of the received data. Second detecting means 22
'Detects data in the time slot represented by the address data (first detection data) from the reception data as second detection data. The third detection means 23 'detects data inserted into the second time slot in one frame from the received data as third detection data. The comparing means 24 'compares the second detection data with the third detection data, and issues an alarm when the two do not match.

More specifically, in the transmitting section 10 ', an address generating means 11' generates address data indicating a position of a time slot to be monitored in one frame from a frame pulse signal indicating a frame start position. The first inserting means 12 'inserts the address data into a first time slot, which is an empty time slot in one frame of the input signal, based on the frame pulse signal. The sampling means 13 'receives the address data from the address generation means 11', and samples the data of the time slot indicated by the address data of the input signal with reference to the frame pulse signal. The second inserting means 14 ′ is a second empty time slot within one frame of the input signal, which is another empty time slot, based on the frame pulse signal.
The data sampled by the sampling means 13 'is inserted into the time slot of (1).

In the receiving section 20 ', the first detecting means 2
1 'detects a first time slot from an input signal (received data) passed through the monitored object 30' with reference to a frame pulse signal, and extracts address data inserted in the transmission unit 10 '. The second detecting means 22 'detects the data of the time slot indicated by the address data from the first detecting means 21' in one frame from the received data based on the frame pulse signal. The third detecting means 23 'detects the second time slot of the received data with reference to the frame pulse signal, and extracts the data inserted in the transmitting unit 10'. The comparison means 21
The second detection data in the received data detected by the second detection means 32 'is compared with the third detection data inserted by the transmission unit 10' and detected by the third detection means 33 '. If there is no abnormality in the monitored object 30 ', the comparison result in the comparison means 24' should match, and if the comparison results do not match, the comparison means 24 'generates an alarm.

[0007] In the transmitting section 10 ', the data generated by the address generating means 11' is sequentially changed in one frame cycle to monitor the data itself online.

[0008] Various other prior arts related to the present invention are also known. For example, Japanese Patent Application Laid-Open No. 5-199240 (hereinafter referred to as Prior Art 2) discloses a “path monitoring method” that can reliably monitor a line path with a simple configuration. Prior Art 2 discloses a monitoring bit insertion unit that inserts path monitoring bit information PB into a predetermined empty 1-bit position of a transmission frame, and extracts a path monitoring bit information PB from an empty 1-bit position of a received frame to perform inspection. And a monitoring bit extraction / inspection unit for performing a path inspection by alternately switching the path monitoring bit information PB between 0 and 1 in units of frames. Preferably, the change of the path monitoring bit information PB extracted from 0 to 1 or 1 to 0 by the monitoring bit extraction / examination unit is detected, so that the alternating phase of the path inspection bit information CB for comparison can be monitored. In accordance with the alternating phase of the use bit information PB.

Japanese Patent Laid-Open Publication No. Hei 5-327577 (hereinafter referred to as Prior Art 3) discloses a method of monitoring a cell processing apparatus in which a monitoring cell is inserted at a designated position to easily monitor a duplex configuration. A monitoring cell insertion control method "is disclosed. Prior art 3 includes a monitoring cell insertion cell generator, a monitoring cell insertion unit, and a monitoring cell extraction unit, and forms monitoring cell insertion in a user cell column. In the case of the redundant configuration of the 0 system and the 1 system, the monitoring cell insertion cells are formed at the same timing in the 0 system and the 1 system. The monitoring cell insertion unit is
The detector detects the cell for monitoring cell insertion and controls the selector to select and output the monitoring cell held in the buffer memory, thereby inserting and transferring the monitoring cell. The monitoring cell extracting unit extracts and collates the monitoring cells, and monitors the normality of the transfer path.

[0010]

However, in the above-described path monitoring method (prior art 1), data is stored in a cell as in an ATM (asynchronous transfer mode) device, and a route is set for each cell in a monitored object. If it is, the path cannot be monitored. The reason is that in the ATM device, the data of a certain time slot in one frame does not generally match the output of the transmitting unit and the input of the receiving unit, so that the receiving unit cannot perform sampling with reference to the frame pulse signal.

Prior Art 2 merely discloses a method of monitoring a line path. Prior art 3
Discloses only a technique of inserting a monitoring cell, extracting the inserted monitoring cell, and collating the monitoring cell, and cannot monitor the normality of user cell data other than the monitoring cell.

An object of the present invention is to provide an in-device path monitoring method capable of monitoring the normality of user cell data other than the monitoring cell.

Another object of the present invention is to provide an in-device path monitoring method which can be applied to an object to be monitored which distributes a route for each cell.

[0014]

According to the present invention, there is provided an intra-device path monitoring system for transmitting a monitoring data to a monitored object and a receiving unit for receiving data output from the monitored object as received data. In the system for monitoring the internal path of the device to be monitored by the unit, the transmitting unit,
VPI / VCI generating means for generating a logical path identifier (VPI) and a logical channel identifier (VCI) to be monitored, and a first monitoring cell storing the logical path identifier and the logical channel identifier to be monitored as information A first cell generating unit for generating the first monitoring cell, a first cell inserting unit for inserting the first monitoring cell into a user cell sequence, and outputting the first inserted user cell sequence; The first monitoring cell is detected from the inserted user cell sequence, and after passing through the first monitoring cell, the logical path identifier and the logical path to be monitored from the first inserted user cell sequence are determined from the first inserted user cell sequence. First cell sampling means for extracting a user cell having a channel identifier as first sample data; and second cell sampling means for generating a second monitoring cell based on the first sample data. And Le generating means, and inserting the second monitoring cell to the first inserted user cells in the series,
A second cell insertion unit that transmits a second inserted user cell sequence as the monitoring data to the monitored object, wherein the receiving unit detects the first monitoring cell from the received data. First cell detecting means for extracting the logical path identifier and the logical channel identifier to be monitored of the detected first monitoring cell, and the logical path identifier and the logical channel to be monitored from the received data. A second cell sampling unit for extracting a user cell having an identifier as second sample data; a second cell detection unit for detecting a second monitoring cell from the received data; And comparing means for comparing the data of the second monitoring cell detected by the second cell detecting means and generating an alarm when the two data do not match. And butterflies.

[0015]

In the transmitting section, the VPI / VCI generating means sequentially generates the VPI / VCI of a cell which can be input to the apparatus, with one frame as a cycle. The monitored VPI / VCI generated by the VPI / VCI generating means is stored in the first monitored cell by the first cell generating means, and inserted into the user cell sequence by the first cell inserting means. In the sampling means, the user cell having the monitoring target VPI / VCI after the first monitoring cell on the time axis is sampled, the second monitoring cell is generated by the second cell generation means, and the second monitoring cell is generated. It is inserted into the user cell sequence by the cell inserting means.

In the receiving section, the first monitored cell is detected by the first cell detecting means, and the monitored VPI / VC is monitored.
I is extracted. By the sampling means, similarly to the transmitting unit, the monitoring target V after the first monitoring cell on the time axis.
A user cell having PI / VCI is sampled.
The second monitoring cell inserted by the transmitting unit is detected by the second cell detecting means. The comparing means compares the sample data of the sampling means with the contents of the second monitoring cell detected by the second detecting means, and issues an alarm when they do not match.

[0017] Even if the cell to be monitored is routed in the monitored object, the first monitoring cell, the VP to be monitored,
Since the same route is selected for the user cell having the I / VCI and the second monitoring cell, the receiving unit checks the physical connection and the data error of the path in the device through which the corresponding VPI / VCI passes. Can be monitored.

[0018]

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

FIG. 1 shows the configuration of an intra-device path monitoring system according to an embodiment of the present invention. The in-device path monitoring method shown in FIG. 1 includes a transmitting unit 10 that transmits monitoring data to the monitored object 30 and a receiving unit 20 that receives data output from the monitored object 30 as received data. The monitoring of the in-device path of the monitored object 30 is performed.

The transmitting section 10 includes a VPI / VCI generating section 11
, A first cell generation unit 12, a first cell insertion unit 13, a sampling unit 14, a second cell generation unit 15, and a second cell insertion unit 16. The receiving unit 20 includes a first cell detecting unit 21, a cell sampling unit 22, a second cell detecting unit 23, and a comparing unit 24.

First, for simplicity, a case in which there is no cell routing will be described. The input user cell string is input to the transmitting unit 10, passes through the monitored object 30, and is input to the receiving unit 20. Also, a frame pulse indicating a reference phase in the device is input to the transmission unit.

FIG. 2 shows an example of a cell processed in the apparatus. The cells processed in the device consist of a 6-byte cell header and a 48-byte information field. The cell header includes one byte defined in the device and a logical path identifier V
12 bits of PI (Virtual Path Identifier) and logical channel identifier VCI (Virtual Channel Identifier)
16 and 3-bit payload part PT (Payload Ty)
pe) and 1-bit cell discard priority CLP (Cell L
oss Priority) and 1-byte header error control unit H
It consists of EC (Header Error Control). In this case, the cell header is related to the inter-network interface. However, in the case of the user network interface, a 4-bit flow control unit GFC is added after 1 byte defined in the device.
(Generic Flow Control) and the VPI has a 12-bit configuration.

Returning to FIG. 1, in the transmitting unit 10, the VP
The I / VCI generator 11 outputs, for example, 1
In the frame period, VPI / VCI values that can be input to the device are sequentially generated. The generated VPI / VCI value is provided to the first cell generation unit 12 and the cell sampling unit 14. The first cell generator 12 receives the given VPI · VC
The first value in which an I value is stored in a header and an identifier indicating a first monitoring cell is added to one byte defined in the device.
A monitoring cell is generated. The first cell insertion unit 13 inserts the first monitoring cell into the input user cell row at a predetermined timing based on the frame pulse, and outputs the first inserted user cell row. The sampling unit 14 converts the first inserted user cell row into the first
After the monitoring cell is detected and passed through the first monitoring cell, the VPI / VCI
A user cell having a VCI is detected, and the cell itself is provided to the second cell generator 15 as sample data. Second
The cell generation unit 15 adds an identifier indicating that the cell is a second monitoring cell to one byte defined in the device, and uses the other bytes as sample data given from the cell sampling unit 14 in the second monitoring. Generate a cell for use. After passing through the first monitoring cell, if the second monitoring cell is given from the second cell generating means, the second cell inserting means 16 outputs the second monitoring cell at a timing predetermined based on the frame pulse. The second monitoring cell is inserted into the user cell string inserted in No. 1 and the second inserted user cell string is transmitted to the monitored object 30 as monitoring data.

In the receiving section 20, the first cell detecting section 2
1 detects a first monitoring cell from a cell string (reception data) that has passed through the monitored object 30 by using an identifier in one byte defined in the apparatus, and sends the VPI / VCI value to the cell sampling unit 22. give. Cell sampling unit 22
Is the same as that of the cell sampling unit 14 in the transmission unit 10. In the transmitting unit 10, the VPI / VCI value for the cell sampling unit 14 is given by the VPI / VCI generating unit 11, but in the receiving unit 20, the VPI / VCI value for the cell sampling unit 22 is changed to the first cell detecting unit 21. Given by The sample data output from the cell sampling unit 22 is provided to the comparison unit 24. The second cell detection unit 23 detects the second monitoring cell using an identifier in one byte defined in the device, and supplies the cell itself to the comparison unit 24. Comparison section 24
Compares the sample data of the cell sampling unit 22 with 53 bytes of the second monitoring cell detected by the second cell detection unit 23, excluding 1 byte defined in the device, to determine a match / mismatch. .

If the physical connection is normal and there is no data error on the path of the user cell from the transmission unit 10 to the reception unit 20, the comparison result in the comparison unit 24 should match, and If they match, the route is determined to be normal.

FIG. 3 shows the configuration of an intra-device path monitoring system according to another embodiment of the present invention. In FIG. 3, the monitored object 30 </ b> A is performing cell routing. An ATM device is considered as the monitored object 30A. The first to third receiving units 20-1, 20-2, and 20-3 are provided at each output destination of the monitored object 30A. Transmission section 2
The operation at 0 is the same as in FIG. The first to third receiving units 20-1 to 20-3 are the receiving unit 2 shown in FIG.
0 has the same configuration.

A first monitoring cell relating to monitoring in the apparatus;
The user cell having the monitored VPI / VCI after passing through the first monitoring cell, that is, the user cell subjected to cell sampling in the transmitting unit 10, and the second monitoring cell all have the same VPI / VCI header. Therefore, even if the route is distributed in the monitored object 30A, it can be distributed to the same output destination.

In the conventional example (FIG. 4), since the positions of the address data and the inserted sample data are detected at the timing based on the frame pulse, the position is changed to the position of the cell in one frame by the route distribution. Occurs, the receiving unit cannot detect the address data and the sample data.

On the other hand, in the present invention, since the monitoring cell is detected using the identifier existing on the cell, the positional relationship between the frame pulse and the cell to be detected is different from that of the transmitting unit. Can also be detected.

The present invention is not limited to the above-described embodiments, and various changes can be made without departing from the spirit of the present invention. For example, it goes without saying that the number of receiving units is not limited to one or three.

[0031]

As is apparent from the above description, according to the present invention, a monitoring cell is detected by adding an identifier to one byte defined in a device existing on a cell in a transmitting unit. For this reason, even if the cell distribution occurs in the subsequent stage of the transmission unit, the path can be monitored. In addition, since user cells are sampled and collated, VPI
In the VCI generating means, by sequentially changing the VPI / VCI value, not only physical connection of the path but also online monitoring of data is enabled for all VPI / VCIs which can be input to the corresponding device. .

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an in-device path monitoring method according to an embodiment of the present invention.

FIG. 2 is a format diagram showing a configuration example of a cell.

FIG. 3 is a block diagram showing a configuration of an intra-device path monitoring method according to another embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a conventional in-device path monitoring method.

[Explanation of symbols]

 Reference Signs List 10 transmitting unit 11 VPI / VCI generating unit 12 first cell generating unit 13 first cell inserting unit 14 cell sampling unit 15 second cell generating unit 16 second cell inserting unit 20, 20-1, 20-2 , 20-3 receiving unit 21 first cell detecting unit 22 cell sampling unit 23 second cell detecting unit 24 comparing unit 30, 30A monitored object

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04L 12/28 H04L 12/24 H04L 12/26

Claims (5)

(57) [Claims] A transmitting unit configured to transmit monitoring data to a monitored object; and a receiving unit configured to receive data output from the monitored object as received data.
0), the transmission unit (10) generates a VPI / VCI that generates a logical path identifier (VPI) and a logical channel identifier (VCI) to be monitored. Means (11), first cell generating means (12) for generating a first monitoring cell storing information on the logical path identifier and the logical channel identifier to be monitored, and the first monitoring cell In the user cell sequence, a first cell insertion unit (13) for outputting the first inserted user cell sequence, and the first monitoring cell from the first inserted user cell sequence. Detect
A first cell for extracting, as first sample data, a user cell having the logical path identifier and the logical channel identifier to be monitored from the first inserted user cell sequence after passing through the first monitoring cell; Sampling means (1
4), second cell generation means (15) for generating a second monitoring cell based on the first sample data, and a user cell sequence in which the second monitoring cell is first inserted. And a second cell insertion unit (16) for transmitting the second inserted user cell sequence as the monitoring data to the monitored object, wherein the reception unit (20) First cell detection means (21) for detecting the first monitoring cell from data and extracting a logical path identifier and a logical channel identifier to be monitored of the detected first monitoring cell; A second cell sampling means (2) for extracting a user cell having a logical path identifier and a logical channel identifier to be monitored from the received data as second sample data;
2), second cell detection means (23) for detecting a second monitoring cell from the received data, and the second monitoring detected by the second sample data and the second cell detection means. An intra-apparatus path monitoring method comprising: comparing means (24) for comparing data of the cells for use with each other and generating an alarm when the two data do not match. 2. A transmitting unit (10) for transmitting monitoring data to a monitored object (30A), and a plurality of receiving units for receiving, as received data, data distributed by the monitored object for each cell. (20-1, 20-2, 20
-3), wherein the transmission unit (10) generates a VPI / VCI that generates a logical path identifier (VPI) and a logical channel identifier (VCI) to be monitored. Generating means (11); first cell generating means (12) for generating a first monitoring cell in which the logical path identifier and the logical channel identifier to be monitored are stored as information; A first cell insertion unit (13) that inserts a cell into a user cell sequence and outputs a first inserted user cell sequence; and a first monitoring cell from the first inserted user cell sequence. To detect
A first cell for extracting, as first sample data, a user cell having the logical path identifier and the logical channel identifier to be monitored from the first inserted user cell sequence after passing through the first monitoring cell; Sampling means (1
4), second cell generation means (15) for generating a second monitoring cell based on the first sample data, and a user cell sequence in which the second monitoring cell is first inserted. And a second cell insertion unit (16) for inserting the second inserted user cell sequence as the monitoring data to the monitored object, wherein the plurality of receiving units (20-1, 20-2, 20-3) detect the first monitoring cell from the received data, and identify the logical path identifier and the logical channel identifier of the detected first monitoring cell to be monitored. And a second cell sampling means (21) for extracting a user cell having a logical path identifier and a logical channel identifier to be monitored from the received data as second sample data. 22) Second cell detection means (23) for detecting a second monitoring cell from the received data; and data of the second monitoring cell detected by the second sample data and the second cell detection means. And a comparing means (24) for generating an alarm when the two data do not match. 3. A VPI for generating a logical path identifier (VPI) and a logical channel identifier (VCI) to be monitored in a transmission unit (10) for transmitting monitoring data to the monitored objects (30, 30A). A VCI generating means (11); a first cell generating means (12) for generating a first monitoring cell in which a logical path identifier and a logical channel identifier to be monitored are stored as information; Insert the monitoring cell into the user cell line,
A first cell insertion unit (13) for outputting a first inserted user cell sequence, detecting the first monitoring cell from the first inserted user cell sequence, and First cell sampling means (14) for extracting, from the first inserted user cell sequence, user cells having the logical path identifier and the logical channel identifier to be monitored as first sample data after passing the cell; Second cell generation means (15) for generating a second monitoring cell based on the first sample data, and inserting the second monitoring cell into the first inserted user cell sequence Then, a second cell insertion unit (1) for transmitting the second inserted user cell sequence to the monitored object as the monitoring data.
6) A transmitter comprising: 4. The transmitting unit according to claim 3, wherein the monitored object is an ATM device. 5. A receiving unit (20, 20-1, 20-) that is used together with the transmitting unit according to claim 3 and receives data output from the monitored object as received data.
2, 20-3), wherein the first monitoring cell is detected from the received data, and the logical path identifier and the logical channel identifier of the detected first monitoring cell to be monitored are extracted. A first cell detecting unit (21) for extracting a user cell having a logical path identifier and a logical channel identifier to be monitored from the received data as second sample data (22) Second cell detecting means (23) for detecting a second monitoring cell from the received data; and the second monitoring cell detected by the second sample data and the second cell detecting means. And a comparing unit (24) for generating an alarm when the two data do not match.