JP3039528B2 - Data 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 a data monitoring method, and more particularly to a data monitoring method for monitoring data input to and output from a signal processing unit through an STM switch unit and an ATM switch unit.

[0002]

2. Description of the Related Art Conventionally, this type of data monitoring system has
It is used to monitor time-division multiplexed data passing through the STM switch and cell multiplexed data passing through the ATM switch, which are input to and output from the signal processor.

Referring to FIG. 13, which is a block diagram of the conventional data monitoring method, the conventional data monitoring method is used when data is exchanged with another signal processing unit or the like connected via an STM network. STM relaying division multiplex data
When the frame is transferred, the frame relay line corresponding unit controls the order so that each frame is received in the order in which it was transmitted. If there is a transmission error, it detects this and receives the frame to be transferred reliably by retransmission. Error detection and
An STM for setting a route to transmit time-division multiplexed data, which is data of a layer 2 protocol input / output to / from a signal processing unit having a plurality of layer 2 termination control units for performing recovery, to an arbitrary layer 2 termination control unit An ATM cell relay line corresponding unit for relaying cell multiplexed data that is data of a layer 2 protocol exchanged between a switch unit and another signal processing unit or the like connected via an ATM network; and the signal processing unit An ATM switch unit for setting a route for sending cell multiplexed data input / output to / from an arbitrary layer 2 termination control unit;
A maintenance operation processing unit that specifies a path to be set in the STM switch unit and the ATM switch unit and monitors an operation state and the like of these switch units;
When monitoring input / output data to a certain layer 2 termination control unit in the termination control unit, a measuring instrument such as a protocol analyzer is connected to a monitoring pin provided in advance in the layer 2 termination control unit, and input is performed by this measuring instrument. Output data is monitored.

[0004]

According to the conventional data monitoring method described above, when monitoring input / output data to a certain layer 2 termination control unit among a plurality of layer 2 termination control units, the layer 2 termination control is performed. When monitoring data of a plurality of layer 2 termination control units, the monitoring is performed by connecting a cable of a measuring instrument such as a protocol analyzer to a monitoring pin provided in advance in each unit.
It is necessary to connect cables of a plurality of measuring instruments or the like to the monitoring pins of the termination control unit, or to change the cables of the measuring instruments or the like. Also,
Since this work needs to be performed at the site where the signal processing unit is located, the operator must go to the site, and there is a problem that it takes a long time before monitoring can be performed.

[0005] An object of the present invention is to provide a data monitoring method which eliminates the need for connecting and changing cables and the like and eliminates the time required for monitoring to eliminate such conventional disadvantages. It is in.

[0006]

According to the first data monitoring method of the present invention, a first switch unit for switching first data, a second switch unit for switching second data, And a signal processing unit for terminating the first data and the second data input / output after passing through the switch unit, and passing through the first switch unit and the second switch unit, respectively. By designating respective paths in the switch section for the first data and the second data, the respective data passing through these paths are respectively monitored.

Further, according to the second data monitoring method of the present invention, a first switch unit for switching first data;
A second switch for switching second data, and a first switch in the first switch for passing the first data.
A maintenance operation processing unit that specifies a path of the second switch unit and a second path in the second switch unit through which the second data passes; and the maintenance operation processing unit that is specified by the maintenance operation processing unit. The first data passing through the first route is received and terminated and monitored, and the second data passing through the second route in the second switch unit specified by the maintenance operation processing unit is received. And a signal processing unit for receiving and monitoring the data and terminating the data.

The maintenance and operation processing unit of the second data monitoring method according to the present invention specifies two of the first paths in the first switch unit and sets the second path in the second switch. The first data passing through the second path among the first paths specified by the maintenance operation processing unit and the maintenance operation processing unit Monitor the second data passing through the second one of the two designated second routes.

The signal processing unit of the second data monitoring method according to the present invention is characterized in that the signal processing unit passes through a second one of the first routes specified by the maintenance operation processing unit. An end monitor unit that monitors data and the second data that passes through a second one of the second paths specified by the maintenance operation processing unit; The first data passing through the first route of the specified first route and the first route of the second route specified by the maintenance and operation processing unit in two passes And a plurality of termination control units for respectively terminating the second data to be processed.

[0010] In the second data monitoring method of the present invention, the terminal monitor unit may include a terminal monitor control unit having the same structure as the terminal control unit, and the frame handled by the first terminal unit in the terminal monitor control unit. The first to monitor multiple data
And a second monitor unit that monitors the frame multiplexed data handled by the second terminal unit in the terminal monitor control unit.

[0011]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a data monitoring method according to the present invention.

In the embodiment shown in FIG. 1, a first switch unit (for example, an STM switch unit 7) for switching first data (for example, time-division multiplexed data 20, hereinafter referred to as time-division multiplexed data 20). , And thereafter the STM switch unit 7
It is described. ) And a second switch unit (for example, an ATM switch unit 8, hereinafter referred to as an ATM switch unit 8) for switching second data (for example, cell multiplexed data 21, hereinafter referred to as cell multiplexed data 21). , The first in the STM switch unit 7 through which the time-division multiplexed data 20 passes.
And a second operation path in the ATM switch section 8 through which the cell multiplexed data 21 passes, and a first operation in the STM switch section 7 specified by the maintenance operation processing section 9 Time-division multiplexed data 2 passing through a route
0, terminates and monitors this data, receives signal multiplexed data 21 passing through the second path in the ATM switch unit 8 specified by the maintenance and operation processing unit 9, and terminates and monitors this data. 1.

The maintenance operation processing unit 9 sets the first route to the STM
Specify two in the switch unit 7 and set the second route to A
The two are designated in the TM switch unit 8, and the signal processing unit 1 determines whether the time division multiplexed data 20 passing through the second path of the first paths designated by the maintenance operation processing unit 9 and the maintenance operation The processing unit 9 monitors the cell multiplexed data 21 passing through the second of the two designated second paths.

The signal processing unit 1 has the time division multiplexed data 20 passing through the second of the first paths designated by the maintenance operation processing unit 9 and the two designated by the maintenance operation processing unit 9. An end monitor unit (for example, a layer 2 end monitor unit 3, hereinafter a layer 2 end monitor unit 3) that monitors the cell multiplexed data 21 passing through the second of the second paths.
It is described. ), The time-division multiplexed data 20 passing through the first route of the two first routes specified by the maintenance operation processing unit 9 and the second route designated by the two maintenance operation processing units 9 And a plurality (for example, N) of termination control units (for example, a layer 2 termination control unit 2, hereinafter referred to as a layer 2 termination control unit 2) respectively terminating the cell multiplexed data 21 passing through the first route. It consists of. here,
The time division multiplexed data 20 passing through the first route and the second route of the first route is the same, and the first route and the second route of the second route are the same. Are the same.

The layer 2 termination control unit 2 receives the time-division multiplexed data 20, converts the data into frame multiplexed data 22, terminates the converted frame multiplexed data 22, and generates an error from the transmission partner as a result of the termination. A first terminating unit (for example, a time division multiplexing data terminating unit 12, hereinafter referred to as a time division multiplexing data terminating unit 12) for converting frame multiplexed data 22, which is data transmitted without any change, into time division multiplexing data 20 and outputting the same. ) And cell multiplexed data 2
1 and converts this data into frame multiplexed data 22, terminates the converted frame multiplexed data 22,
A second terminating unit (for example, a cell multiplexing data terminating unit 13, hereinafter referred to as a cell multiplexing data terminating unit 13) configured to convert frame multiplexed data 22 appearing as a result of termination into cell multiplexed data 21 and output the converted data. Have been.

The layer 2 termination monitor unit 3 has a layer 2 termination monitor control unit 4 having the same structure as the layer 2 termination control unit 2,
A first monitor unit (for example, a time division multiplex data monitor unit 5, hereinafter referred to as a time division multiplex data monitor unit 5) which monitors the frame multiplex data 22 handled by the time division multiplex data termination unit 12 in the layer 2 termination monitor control unit 4. Will be described.)
And a second monitor unit (for example, a cell multiplex data monitor unit 6, hereinafter referred to as a cell multiplex data monitor unit 6) which monitors the frame multiplex data 22 handled by the cell multiplex data terminal unit 13 in the layer 2 terminal monitor control unit 4. ).

Here, the time division multiplexed data 20 and the cell multiplexed data 21 are, for example, LAPD, LAPB, LAP
F, SSCOP, or data of a layer 2 protocol such as No. 7.

FIG. 1 shows an STM frame relay line corresponding unit 1 for relaying time-division multiplexed data 20 exchanged with another signal processing unit or the like connected via an STM network.
0, and an AT that relays cell multiplexed data 21 exchanged between another signal processing unit and the like connected via an ATM network.
The figure also shows an M cell relay line corresponding unit 11.

Next, the operation of the data monitoring method according to the present embodiment will be described in detail with reference to FIGS.

FIG. 2 is a block diagram showing an example of the layer 2 termination control section. The layer 2 termination control section 2 converts input line data (time division multiplexed data 20 shown in FIG. 3) on the STM switch section 7 side. Is input to the time division multiplexing data terminating unit 12 and is converted into the frame multiplexing data 22 shown in FIG.
Layer 2 termination is performed in the termination section. Further, the frame multiplexed data 22 shown in FIG. 4 terminated by layer 2 at the multiprotocol layer 2 termination unit is converted into the time division multiplexed data 20 shown in FIG. Output to the unit 7 side. Similarly, the input line data (cell multiplexed data 21 shown in FIG. 5) on the ATM switch section 8 side, that is, for example, A0-0
N ATMs from A0 to A0-53 to An-0 to An-53
The cell is input to the cell multiplexing data terminating unit 13 and converted into the frame multiplexing data 22 shown in FIG. 4 by the cell multiplexing frame multiplexing conversion unit.
An 1-frame data of An is converted, and the layer 2 termination is performed in the multi-protocol layer 2 termination unit. Further, the frame multiplexed data 22 shown in FIG. 4 terminated by layer 2 at the multiprotocol layer 2 terminating unit, that is, for example, one frame data of A0 to An of the link number A is converted by the cell multiplexing frame multiplexing conversion unit into FIG. Cell multiplexed data 2 shown in
1, that is, for example, from A0-0 to A0-53 to n ATM cells An-0 to An-53,
The data is output to the ATM switch unit 8 as output line data.

FIG. 3 is a diagram showing an example of time-division multiplexed data input / output from the first terminal of the layer 2 terminal controller.

FIG. 4 is a diagram showing an example of frame multiplexed data generated inside the first terminal unit and the second terminal unit of the layer 2 terminal control unit. Here, the link number is a frame identifier.

FIG. 5 is a diagram showing an example of cell multiplexed data input / output by the second terminal of the layer 2 terminal controller.
This indicates that the frame data of the link number A having one frame length A0 to An is multiplexed into n ATM cells A0-0 to A0-53 to An-0 to An-53.

FIG. 6 is a diagram showing an example of a path of input line data (time-division multiplexed data) on the STM switch section side.

FIG. 7 is a diagram showing an example of a path of output line data (time-division multiplexed data) output to the STM switch section.

FIG. 8 is a diagram showing an example of a path of input line data (cell multiplexed data) on the ATM switch side.

FIG. 9 is a diagram showing an example of the path of output line data (cell multiplexed data) output to the ATM switch section.

FIG. 10 is a diagram showing an example of a path of line data (time division multiplexed data) transmitted from one layer 2 termination control unit to another layer 2 termination control unit via the STM switch unit.

FIG. 11 is a diagram showing an example of a path of line data (cell multiplexed data) transmitted from one layer 2 termination control unit to another layer 2 termination control unit via the ATM switch unit.

FIG. 12 is a block diagram showing an example of the layer 2 termination monitor section. The layer 2 termination monitor section 3 includes a time division multiplex data monitor section 5 and a cell multiplex data monitor section 6 in the layer 2 termination control section 2. The frame multiplexing data 22 shown in FIG. 4 converted by the time division multiplexing frame multiplexing conversion unit and the cell multiplexing frame multiplexing conversion unit is monitored by the time division multiplexing data monitoring unit 5 and the cell multiplexing data monitoring unit 6. At the same time, the monitoring result and the like are notified to the maintenance operation processing unit 9.

In FIG. 1, an STM frame relay line corresponding unit 10 relays time division multiplexed data 20 exchanged with another signal processing unit or the like connected via an STM network. The STM switch unit 7 sets a route for transmitting time-division multiplexed data 20 input / output to / from the signal processing unit 1 having N layer 2 termination control units 2 to an arbitrary layer 2 termination control unit 2. The ATM cell relay line corresponding section 11 is an ATM
It relays the cell multiplexed data 21 exchanged with another signal processing unit or the like connected via a network. The ATM switch unit 8 sets a path for transmitting the cell multiplexed data 21 input / output to / from the signal processing unit 1 to an arbitrary layer 2 termination control unit 2. The maintenance operation processing unit 9 designates a route to be set in the STM switch unit 7 and the ATM switch unit 8 and monitors the operation state of these switch units. The layer 2 termination control unit 2 is configured to transmit and receive different types of protocols (for example, the STM switch unit 7 and the ATM switch unit 8).
LAPD, LAPB, LAPF, SSCOP or No7
Layer 2 termination of line data (time-division multiplexed data 20 and cell multiplexed data 21) of a layer 2 protocol such as the above. Here, the terminating layer 2 means processing a layer 2 protocol, for example, transferring information, detecting a transmission error, and the like. Layer 2 termination monitor 3
FIG. 4 shows the result of conversion by the time division multiplexing frame multiplexing conversion unit or the cell multiplexing frame multiplexing conversion unit as shown in FIG.
Are monitored by the time-division multiplexed data monitoring unit 5 and the cell multiplexed data monitoring unit 6, and the monitoring result and the like are notified to the maintenance operation processing unit 9.

When monitoring the line data (the time division multiplexed data 20 shown in FIG. 3) input from the STM frame relay line handling unit 10 to any one of the layer 2 termination control units 2, as shown in FIG. The operation processing unit 9 provides the STM switch unit 7 with two routes, a route to the layer 2 termination control unit 2 (first route) and a route to the layer 2 termination monitor unit 3 (second route). Specify two route settings,
The STM switch unit 7 sets this route. Then, the time-division multiplexed data 20 passes through the STM switch unit 7 according to these paths, and the layer 2 connected by the first path.
The same data as the time-division multiplexed data 20 processed by the termination control unit 2 is input to the layer 2 termination monitoring unit 3 and this data is monitored.

If any of the layer 2 termination control units 2
When monitoring the line data (the time-division multiplexed data 20 shown in FIG. 3) output to the M-frame relay line corresponding unit 10, as shown in FIG. STM frame trunk line support unit 1
The two path settings are designated, namely, a path to the path No. 0 (first path) and a path to the layer 2 termination monitor unit 3 (second path), and the STM switch unit 7 sets these paths. .
Then, the time-division multiplexed data 20 passes through the STM switch unit 7 according to these paths, and is output from the layer 2 termination control unit 2 connected to the first path to the STM frame relay line corresponding unit 10. The same data as 20 is input to the layer 2 terminal monitor 3 and this data is monitored.

When monitoring the line data (cell multiplexed data 21 shown in FIG. 5) inputted from the ATM cell relay line corresponding unit 11 to any one of the layer 2 termination control units 2, FIG.
As shown in (1), the maintenance operation processing unit 9 sends the ATM switch unit 8 a route to the layer 2 termination control unit 2 (first route) and a route to the layer 2 termination monitor unit 3 (two routes). The second path setting is specified, and the ATM switch unit 8 sets these paths. Then, the cell multiplexed data 21 passes through the ATM switch section 8 according to these paths, and is connected to the layer 2 termination control section 2 by the first path.
The same data as the cell multiplexed data 21 processed in step (1) is input to the layer 2 termination monitor unit 3 and this data is monitored.

If any one of the layer 2 termination control units 2
When monitoring the line data (cell multiplexed data 21 shown in FIG. 5) output to the M cell relay line corresponding unit 11, FIG.
As shown in (1), the maintenance operation processing unit 9 sends the ATM switch unit 8 a route (first route) to the ATM cell trunk line corresponding unit 11 and a route (second route) to the layer 2 termination monitor unit 3. Route setting), and specify the two route settings.
The ATM switch unit 8 sets this route. The cell multiplexed data 21 passes through the ATM switch unit 8 according to these paths, and the cell multiplexed data 21 output from the layer 2 termination control unit 2 connected to the first path to the ATM cell relay line corresponding unit 11 is connected to the cell multiplexed data 21. The same data is input to the layer 2 terminal monitor 3 and the data is monitored.

Layer 2 via STM switch 7
When monitoring the line data (the time division multiplexed data 20 shown in FIG. 3) transmitted from the termination control unit 2 to another layer 2 termination control unit 2, as shown in FIG. 7, a path (first path) from a certain layer 2 termination control section 2 to another layer 2 termination control section 2 and a path from a certain layer 2 termination control section 2 to the layer 2 termination monitoring section 3. Two path settings are specified for the path (second path), and the STM switch unit 7 sets these paths. Then, the time division multiplexed data 20 passes through the STM switch unit 7 according to these paths, and is output from one layer 2 end control unit 2 to another layer 2 end control unit 2 connected by the first path. The same data as the multiplexed data 20 is input to the layer 2 termination monitor unit 3 and the data is monitored.

Layer 2 via ATM switch unit 8
When monitoring the line data (cell multiplexed data 21 shown in FIG. 5) transmitted from the termination control unit 2 to another layer 2 termination control unit 2, as shown in FIG. In contrast, a route from a certain layer 2 termination control unit 2 to another layer 2 termination control unit 2 (first route) and a route from a certain layer 2 termination control unit 2 to a layer 2 termination monitoring unit 3 Two routes (second route) are specified, and the ATM switch unit 8 sets these routes. Then, the cell multiplex data 2
1 passes through the ATM switch unit 8 and is connected from the certain layer 2 termination control unit 2 by the first route.
The same data as the cell multiplexed data 21 output to the termination control unit 2 is input to the layer 2 termination monitoring unit 3 and this data is monitored.

In the above description, the layer 2 termination monitor 3
Has been described, but a plurality of layer 2 termination monitoring units 3 are provided, and a plurality of route setting designations from the maintenance operation processing unit 9 are performed at once, so that a plurality of layer 2 termination control units 2 Line data may be monitored.

[0040]

As described above, according to the data monitoring method of the present invention, the maintenance operation processing section allows the first path in the first switch through which the first data passes to the second path.
, A second path in the second switch through which the data passes, and the first switch and the second switch are connected to the first path and the second path specified by the maintenance operation processing unit. The signal processing unit receives the first data passing through the first path in the first switch unit, terminates and monitors the data, and monitors the first data in the second switch unit. In order to receive the second data passing through the second path and terminate and monitor the data, the maintenance and operation processing unit only instructs the STM switch unit and the ATM switch unit to set the first data and the second data.
Can be monitored, so that it is not necessary to connect or change cables or the like for monitoring, and it does not take much time until the data can be monitored. Further, the maintenance operation processing unit and the STM switch unit, the ATM switch unit, the signal processing unit, the termination monitor unit, and the like are communicated via a network such as an Ethernet, for example, so that the signal processing unit and the like are installed. It can also be monitored remotely.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a data monitoring method according to the present invention.

FIG. 2 is a block diagram illustrating an example of a layer 2 termination control unit.

FIG. 3 is a diagram showing an example of time-division multiplexed data input / output by a first terminal unit of a layer 2 terminal control unit.

FIG. 4 is a diagram illustrating a first termination unit and a second termination unit of a layer 2 termination control unit.
FIG. 9 is a diagram showing an example of frame multiplexed data generated inside the terminal section of FIG.

FIG. 5 is a diagram illustrating an example of cell multiplexed data input / output by a second terminal unit of the layer 2 terminal control unit.

FIG. 6 is a diagram illustrating an example of a path of input line data (time-division multiplexed data) on the STM switch unit side.

FIG. 7 is a diagram illustrating an example of a path of output line data (time-division multiplexed data) to be output to the STM switch unit side.

FIG. 8 is a diagram showing an example of a path of input line data (cell multiplexed data) on the ATM switch side.

FIG. 9 is a diagram illustrating an example of a path of output line data (cell multiplexed data) output to the ATM switch unit side.

FIG. 10 is a diagram illustrating an example of a path of line data (time division multiplexed data) transmitted from one layer 2 termination control unit to another layer 2 termination control unit via an STM switch unit.

FIG. 11 is a diagram illustrating an example of a path of line data (cell multiplexed data) transmitted from one layer 2 termination control unit to another layer 2 termination control unit via an ATM switch unit.

FIG. 12 is a block diagram illustrating an example of a layer 2 termination monitor unit.

FIG. 13 is a block diagram of a conventional data monitoring method.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 signal processing unit 2 layer 2 termination control unit 3 layer 2 termination monitor unit 4 layer 2 termination monitor control unit 5 time division multiplexed data monitor unit 6 cell multiplexed data monitor unit 7 STM switch unit 8 ATM switch unit 9 maintenance operation processing unit 10 STM frame relay line corresponding unit 11 ATM cell relay line corresponding unit 12 Time division multiplex data termination unit 13 Cell multiplex data termination unit 20 Time division multiplex data 21 Cell multiplex data 22 Frame multiplex data

Claims (13)

(57) [Claims] A first switch unit for switching first data, a second switch unit for switching second data, and the first data input and output through these switch units. A signal processing unit for terminating the second data, wherein each of the first data and the second data passing through the first switch unit and the second switch unit, respectively; A data monitoring method, wherein each of the data passing through these paths is monitored by designating a path in the switch unit. 2. A first switch unit for switching first data, a second switch unit for switching second data, and a first switch unit in the first switch unit through which the first data passes. And a maintenance operation processing unit that specifies a second path in the second switch unit through which the second data passes, and a maintenance operation processing unit that specifies the second operation unit in the first switch unit specified by the maintenance operation processing unit. The first data passing through the first route is received and terminated and monitored, and the second data passing through the second route in the second switch unit specified by the maintenance operation processing unit is received. A signal processing unit that receives the data of (1) and terminates the data and monitors the data. 3. The maintenance and operation processing unit specifies two of the first paths in the first switch unit and two of the second paths in the second switch unit. The processing unit is configured to pass the first path passing through a second path among the first paths specified by the maintenance operation processing unit.
Data and the second specified by the maintenance operation processing unit
3. The data monitoring method according to claim 2, wherein each of the second data and the second data passing through a second one of the paths is monitored. 4. The signal processing unit according to claim 1, wherein the first data passing through a second one of the first paths designated by the maintenance operation processing unit and the maintenance operation processing unit An end monitor unit that monitors the second data that passes through a second one of the second routes that have been specified, and a second one of the first routes that the maintenance and operation processing unit has specified. The first data passing through the first route of the first route and the second data passing the first route of the second route specified by the maintenance operation processing unit are respectively The data monitoring method according to claim 3, further comprising: a plurality of termination control units that terminate. 5. The data monitoring method according to claim 1, wherein the monitoring is performed after converting the data to be monitored into frame multiplexed data. 6. The termination control unit receives the first data, terminates the data, and outputs a termination result as the first data, the first termination unit; 5. A data monitoring method according to claim 4, further comprising: a second termination unit that receives the data of (1), terminates the data, and outputs a termination result as the second data. . 7. The termination control unit receives the first data, converts the data into frame multiplexed data, terminates the converted frame multiplexed data, and converts the converted frame multiplexed data into a frame multiplexed data. A first terminating unit that converts the data into 1 data and outputs the data, and receives the second data, converts the data into frame multiplexed data, terminates the converted frame multiplexed data, and terminates the data. 5. The data monitoring method according to claim 4, further comprising: a second terminal unit that converts the appearing frame multiplexed data into the second data and outputs the second data. 8. The termination monitor unit has a termination monitor control unit having the same structure as the termination control unit, and a first monitor that monitors the frame multiplexed data handled by the first termination unit in the termination monitor control unit. The data monitoring method according to claim 7, further comprising: a second monitoring unit that monitors the frame multiplexed data handled by the second terminal unit in the terminal monitor control unit. 9. The method according to claim 1, wherein the first data is time division multiplexed data, the second data is cell multiplexed data,
4. The data monitoring method according to claim 1, wherein the switch unit is an STM switch unit, and the second switch unit is an ATM switch unit. 10. The data monitoring method according to claim 4, wherein said first data is time division multiplexed data, and said second data is cell multiplexed data. 11. The first data is time division multiplexed data, the second data is cell multiplexed data, and the first terminal is a time division multiplexed data terminal for terminating the time division multiplexed data. 8. The data monitoring method according to claim 6, wherein said second terminating unit is a cell multiplexed data terminating unit for terminating said cell multiplexed data. 12. The first terminal section is a time division multiplex data termination section for terminating time division multiplexed data, the second termination section is a cell multiplex data termination section for terminating cell multiplex data, 9. The time-division multiplexed data monitor for monitoring the time-division multiplexed data, and the second monitor is a cell multiplexed data monitor for monitoring the cell multiplexed data. Data monitoring method. 13. The data monitoring method according to claim 9, wherein the time division multiplexed data and the cell multiplexed data are data of a layer 2 protocol.