JP3486342B2 - Node device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission end and / or a reception end of transmission information in a network to which a CSMA system is applied, or to concentrating lines at the core or end of a segment constituting the network. The present invention relates to a node device that performs any of relaying, filtering, and routing.

[0002]

2. Description of the Related Art In recent years, along with information terminals such as personal computers and information tools, the cost of modems and terminal adapters that realize high transmission speeds has been reduced, and competition among a plurality of communication carriers including providers has been achieved. Internet users are increasing rapidly due to the reduction of communication charges and the provision of various services under the Internet.

Further, in many businesses that have a plurality of information terminals accommodated in a LAN, in order to efficiently and accurately use various possibilities and advantages of the Internet,
As an environment in which these information terminals can access the Internet in parallel, expansion and merge of LAN via hubs, repeaters, bridges and routers, and sharing of leased lines and dial-up lines formed with providers However, it is beginning to be aggressive.

FIG. 8 shows an LA extended via a repeater.
It is a figure which shows the structural example of N. In the figure, segment 6
1-A is connected to the segment 61-B via the repeater 62-AB, and the segment 61-B is connected to the segment 61-C via the repeater 62-BC. Segment 61-C
Are connected to the segments 61-D, 61-E, 61-F via repeaters 62-CD, 62-CE, 62-CF, respectively.
The segment 61-E is connected to the segment 61-G via the repeater 62-EG, and the segments 63-A to 61-G are provided with terminals 63-A to 63-G, respectively.

In the LAN having such a configuration, the repeater 6
2-AB, 62-BC, 62-CD, 62-CE, 62-CF, 62-EG
Is a segment (indicated by any of the symbols “61-A” to “61-F”) connected to two ports individually provided.
Bi-directional amplification and regeneration of the signal between the two achieves extended transmission distances and desired topologies not achievable with a single segment.

The above-mentioned segments 61-A to 61-F
For the sake of simplicity, the multiple access method applied to the following will be described below for the sake of simplicity in terms of CSMA / compliant with the IEEE802.3 standard.
It is assumed that the CD system is used. Further, for example, when the terminal 63-A arranged in the segment 61-A should transmit some transmission information, some terminal (not shown) arranged in the segment 61-A and the segment 61 thereof are transmitted.
-The repeaters 62-AB, 62-BC, 62-CD, 62- already described in A.
Other segment 61-B through CE, 62-CF, 62-EG
It is determined whether or not the terminals 63-B to 63-G connected to the 61-F are transmitting (FIG. 9 (1)).

Further, the terminal 63-A suspends the transmission of the corresponding transmission information during the period when the result of such discrimination is true (FIG. 9 (2)), but on the contrary, when it is false. Starts transmitting the transmission information (FIG. 9 (3)).

However, for example, when the terminals 63-G arranged in the segment 61-G start transmission at substantially the same time, the signal actually transmitted to the segment 61-G in response to the transmission (hereinafter, ""Delayed incoming signal") is a repeater 62-EG, a segment 61-E, a repeater 62-CE,
Segment 61-C, Repeater 62-BC, Segment 61
-B, the repeater 62-AB, and the segment 61-A, the terminal 63-A is delayed for the propagation delay time of the transmission path.
To reach.

In the transmission process which has already started, the terminal 63-A determines whether or not the potential of the segment 61-A has a prescribed value (FIG. 9 (4)). Further, when the result of the determination is false, the terminal 63-A means that a collision with some delayed arrival signal has occurred, and therefore the transmission is promptly interrupted (FIG. 9 (6)). Together with a specific word (hexadecimal "55" or "A" that repeats over 64 bits or more
A ". 9) is transmitted (FIG. 9 (6)), and the corresponding transmission information is abandoned for a predetermined period (given by a random number) from this point as a starting point. (Fig. 9 (7)).

The terminals 63-B to 63-G respectively arranged in the segments 61-B to 61-G transmit the above-mentioned transmission information from the terminal 63-A to the segments 63-B to 63-G.
The signal sent to -A is likewise provided as a "delayed incoming signal". Further, the above-mentioned jam signal includes the segment 61-A, repeater 62-AB, segment 61-B, repeater 62-BC, segment 61-C, repeater 62-CE.
, Segment 61-E and repeater 62-EG to terminals 63-B-63-G.

All the terminals 63-B to 63-G arranged in the segments 61-B to 61-G identify the jam signal as described above (FIG. 9 (8)) so that it can be transmitted in advance. For transmission information that has started, segments 61-B to 61-
It recognizes that the re-transmission should be performed because a collision has occurred in any of -F, and the start of the transmission is postponed during the period in which the jam signal is received (FIG. 9 (9)).

In the terminals 63-B to 63-G, the terminal 63
-The processing based on the same procedure as the above-described processing performed by A is performed asynchronously with the terminal 63-A. Therefore, the description of the processing is omitted here. Therefore, the terminals 63-A to 63-G are connected to the repeaters 62-AB and 62-B.
Transmission and reception of desired transmission information based on the CSMA / CD system via a plurality of segments 61-A to 61-G connected via C, 62-CD, 62-CE, 62-CF and 62-EG. can do.

[0013]

By the way, in such a conventional example, (1) a segment (reference numeral “61-A”) interposed between the terminals 63-A and 63-G, such as between the terminals 63-A and 63-G. , 6
1-B, 61-C, 61-E, 61-G ". ) Is “5” or more, or (2) due to obstacles, characteristic fluctuations and variations, repeaters 62-AB, 62-BC, 62
When the propagation delay time of -CD, 62-CE, 62-CF, 62-EG becomes excessive, the above-mentioned "delayed incoming signal" is delayed by more than the specified upper limit value.

Therefore, when the probability of occurrence of a collision increases remarkably and the delay is too large, a collision (hereinafter referred to as "collision") is delayed at a time of 512 bits or more of transmission information from the start of transmission. Then, such a collision may be called "late collision". In addition, when any of the above items (1) and (2) is met, the recognition of the occurrence of the collision and the transmission of the jam signal described above are significantly delayed in the terminals 63-A to 63-G. Therefore, the segments 61-A to 61-G remain unnecessarily occupied by a specific terminal for a long time,
Moreover, there is a high possibility that the transmission efficiency will significantly decrease.

In the segment 61-A to 61-G, the segment in which the above-mentioned collision or late collision has occurred is identified by, for example, SNMP (Simple Network Ma
L equipped with a hub adapted to the Nage-ment Protocol)
This has already been realized in AN. However, in an environment where only a device such as a LAN protocol analyzer that does not have a function equivalent to such a hub is applied, the repeaters 62-AB, 62-BC can be used to identify the segment in which the above-mentioned collision or late collision occurs. , 62-CD, 62-CE, 62-CF,
In many cases, the 62-EG requires a lot of man-hours for relaying in the physical layer.

Furthermore, since the expansion of the irregular segment which causes the late collision described above can be performed by an artificial error, the general normality of the LAN can be confirmed accurately and efficiently. There was a strong demand for the technology to be achieved. It is an object of the present invention to provide a node device that enables easy and inexpensive grasp of the operating status of each segment.

[0017]

FIG. 1 is a block diagram showing the principle of the invention described in claims 1-5. The invention according to claim 1 is connected to a single or a plurality of segments constituting a network to which the CSMA method is applied, and has a function of a transmission source or a reception destination of transmission information and any of concentrating, relaying, filtering and routing. The segment corresponding means 11 having all or a part of the function to realize the above and the single or plural segments or the segment corresponding means 11 are monitored, and a specific event occurred in these segments or the segment corresponding means 11 is monitored. Monitoring means 12 for detecting
When a specific event is detected by the monitoring means 12, a jam signal adapted to the CSMA method and a tail signal of the jam signal are added to all or part of a single or a plurality of segments , and this particular jam signal is added . A first identifier that indicates where the event occurred, and a second identifier that indicates this particular event.
Warning means 13 for sending warning information including a child
It is characterized by having and.

According to a second aspect of the invention, in the node device according to the first aspect, the alarm means 13 is a monitoring means 1.
2 has a means for selecting a segment to which alarm information is to be sent out from a single or a plurality of segments based on a specific event detected by 2 and / or a degree of the specific event. Is characterized by. The invention described in claim 3 is the node device according to claim 1 or 2, wherein the alarm means 13 is included in the alarm information.
Either or both of the first identifier and the second identifier
Jam one of them in a redundant format or as a redundant code
It is characterized by being added to the end of the signal .

According to a fourth aspect of the invention, in the node device according to any one of the first to third aspects,
All or part of a single or multiple segments
Synchronize with the jam signal that can be obtained,
Both the first and second identifiers added to the end
Alternatively, an identifier acquisition unit 21 that acquires either one of
The first identifier obtained by the identifier obtaining means 21 and
Either or both of the second identifier and
Mammashi with man-machine interface related to knowledge
Interface means 22 . In the invention described in claim 5, the CSMA method is applied.
Connected to the single or multiple segments that make up the
The function of the sender or receiver of the transmission information, the line concentration,
Perform either relaying, filtering or routing
A segment pair that has all or part of the function it exposes
Response means 11 and a single or multiple segments or
The segment response means 11 is monitored and these segment
Or a specific event that occurred in the segment handling means 11
Monitoring means 12 for detecting
When a single event or multiple segment
All or part of the
Signal and this particular event at the end of the jam signal.
Warning information with a first identifier that indicates the location where it originated
Information is sent out and detected by the monitoring means 12.
Based on both the particular event and the extent of that particular event
Alert information in single or multiple segments
Alarm means having means for selecting a segment to be played
And 13 are provided.

In the node device according to the first aspect of the present invention, the segment corresponding means 11 is connected to a single or a plurality of segments that constitute a network to which the CSMA method is applied, and is a transmission source or a reception source of transmission information. It has all or a part of the above functions and the functions of implementing any of line concentrating, relaying, filtering, and routing.
Further, the monitoring means 12 monitors the above-mentioned single or plural segments or the segment corresponding means 11 thereof, and these segments or the segment corresponding means 1 are monitored.
The specific event that occurred in 1 is detected. When such a specific event is detected, the alarm means 13 causes all or a part of the above-mentioned single or plural segments to have a CS.
A jam signal adapted to the MA method, a first identifier added to the end of the jam signal and indicating a place where this specific event has occurred, and a second identifier indicating this specific event are provided.
Send the included alert information.

That is, in the process in which the segment correspondence means 11 operates as any of a terminal, a repeater, a bridge, and a router under the above-mentioned function, a specific event occurs in the segment correspondence means 11 or any connected segment. When it occurs, the place where the specific event has occurred is notified to the outside through the desired segment. Therefore, even when the network is composed of a plurality of segments arranged in multiple stages, among those segments, the segment to which the jam signal and the first identifier described above can be transmitted is used for signal monitoring. The location of the occurrence of the above-described specific event can be accurately achieved through the device described above. In addition, a specific event occurs at the notification destination of the alarm information.
Information that enables the identification of the specific event.
Since information can be obtained, accurate maintenance and operation are possible.

According to a second aspect of the node device of the present invention, in the node device of the first aspect, the alarm means 13 includes a specific event detected by the monitoring means 12 and a degree of the specific event. A segment to which alarm information is to be sent is selected from a single segment or a plurality of segments based on both or either one. That is, the notification destination of the location where the specific event has occurred is appropriately determined according to the specific event that actually occurred and the degree of the specific event. In addition to intervening segments and communication links, it is possible to perform fault handling flexibly adapted to the operating status of the device that should be the candidate.

According to a third aspect of the node device of the present invention, in the node device according to the first or second aspect, the alarm means 13 is a first device included in the alarm information.
Both the identifier and / or the second identifier are redundant.
The end of the jam signal in long form or as a redundant code
Added to. That is, the first identifier and the
Since the two identifiers are given redundantly, these identifiers
Transmission in any of the segments that are the transmission route
In the event of poor quality or collisions or obstacles
Even if the alarm information is notified, a specific event has occurred.
Highly accurate information that enables identification of locations and specific events
Transmitted.

In the node device according to the invention described in claim 4, in the node device according to any one of claims 1 to 3, the identifier acquisition means 21 is a single unit or a single unit.
Or all or part of multiple segments
The jam signal is synchronized with the
Both the added first and second identifiers
Acquires either one. Also, the man-machine interface
The source means 22 uses the thus obtained first identification.
The child and / or the second identifier
And takes the man-machine interface involved in notification.
That is, the identifier acquisition unit 21 and the man-machine interface
The face means 22 monitors the signal in the desired segment.
Since it also serves as a device that enables vision,
Such equipment is not applicable in the segment.
The location where the specific event occurred and the specific event
The identification is performed in parallel with high accuracy.

In the node device according to the invention described in claim 5, the segment correspondence means 11 is of the CSMA system.
Applied to the single or multiple segments that make up the web
Function of connection and transmission source or destination of transmission information
And for concentrating, relaying, filtering and routing
It has all or part of the function of realizing either.
Further, the monitoring means 12 is a single or a plurality of segments described above.
Ment or its segment corresponding means 11 is monitored.
Yes, these segments or segment corresponding means 1
The specific event that occurred in 1 is detected. The alarm means 13 is
Unlike the node device according to the invention described in claim 1,
When such a specific event is detected,
C for all or part of single or multiple segments
A jam signal that is compatible with the SMA method and the jam signal
A first identification at the end that indicates where this particular event occurred
The alarm information including the child is transmitted. Warning means 13
Is a specific event detected by the monitoring means 12 and its
Single or multiple, based both on the extent of a particular event
Of the segments of which the alarm information should be sent
Select the

That is, the segment corresponding means 11 is up.
Under the functions described, terminals, repeaters, bridges, routers
In the process of operating as either,
Specific to stage 11 or any connected segment
When an event occurs, the number of occurrences of that particular event.
The location is notified to the outside through the desired segment. did
Therefore, the net is composed of multiple segments arranged in multiple stages.
Of these segments, even if
The segment in which the jam signal and the first identifier can be transmitted
Ment described above via the equipment used for signal monitoring.
The identification of the location where the specific event
It Also, regarding the notification destination of the location where the specific event occurred
Is the specific event that actually occurred and the extent of that specific event
It will be decided depending on the
In addition to the segments and communication links that intervene between
Obstacles that flexibly adapt to the operating status of equipment that should be candidates
Harm treatment is possible.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 2 shows the first of the present invention.
It is a figure which shows embodiment of ( 4 ). In the figure, components having the same functions and configurations as those shown in FIG. 8 are designated by the same reference numerals, and description thereof will be omitted here.

The difference between the present embodiment and the conventional example shown in FIG. 8 lies in the repeaters 62-AB, 62-BC, 62-CD, 62-.
Repeater 41-AB, 41-in place of CE, 62-CF, 62-EG
BC, 41-CD, 41-CE, 41-CF, 41-EG are provided. Further, the repeater 41-AB has a segment 61
-A, 61-B segment corresponding portion 42 connected respectively
-A, 42-B, the shift register 43-AB arranged between the output of the segment corresponding unit 42-A and the input of the segment corresponding unit 42-B, and the output of the segment corresponding unit 42-B and the segment corresponding A shift register 43-BA arranged between the shift register 43-BA and a section 42-A, and a sending time detector 44-AB connected to the parallel output of the shift register 43-AB and the load terminal of the shift register 43-AB, Transmission time detection unit 44 connected to the parallel output of the shift register 43-BA and the load terminal
-BA and additional information registers 45-AB, 45- connected to the parallel inputs of shift registers 43-AB, 43-BA, respectively
To the bus terminals of the BA, the segment corresponding parts 42-A, 42-B, the shift registers 43-AB, 43-BA, the sending time detecting parts 44-A, 44-B and the additional information registers 45-AB, 45-BA. And connected processor 46-AB.

The shift registers 43-AB, 43-BA,
A clock whose frequency is equal to the transmission speed of the segments 61-A and 61-B is given to the clock terminals of the sending time detectors 44-AB and 44-BA and the additional information registers 45-AB and 45-BA. Also, repeaters 41-BC, 41-CD, 41-C
For the configuration of E, 41-CF, 41-EG, repeater 41
-Since it is the same as the configuration of AB, each component has a subscript "B" -appended to a code indicating a single or two corresponding segments of segments 61-B-61-G. The same reference numeral as "G" is added, and the description thereof is omitted here.

Furthermore, regarding the correspondence relationship between this embodiment and the block diagram shown in FIG. 1, for example, repeater 41-AB
Then, the segment corresponding part 42-A (42-B) corresponds to the segment corresponding means 11, and the segment corresponding part 42-A (42-B)
The processor 46-AB corresponds to the monitoring means 12 and the identifier acquisition means 21, and the shift register 43-AB (43-B
A), the sending time detector 44-AB (44-BA), the additional information register 45-AB (45-BA) and the processor 46-AB correspond to the alarm means 13, and the processor 46-AB is the man-machine interface means 22. Corresponding to.

FIG. 3 is an operation flowchart of the first to third embodiments of the present invention . The operation of the first embodiment of the present invention will be described below with reference to FIGS. 2 and 3. The processor 46-AB provided in the repeater 41-AB is shown in FIG.
And as shown in FIG. 5, <1> “port identifier” uniquely assigned in advance to the port formed individually by the segment corresponding parts 42-A and 42-B (here, for simplicity, “ A ",
Assume "B". ) And “segment identifiers” (here, for simplicity, assume “1” and “2”) indicating the segments 61-A and 61-B connected to these ports in advance. The associated and stored communication port register 51-AB and <2> the segment 61 corresponding individually to the segment identifiers "1" and "2" described above and of the segments 61-A to 61-G. -A and 61-B has a status register 52-AB formed of a set of records in which statuses indicating the operating statuses are stored in a specific storage area of the main storage.

At the time of startup, the processor 46-AB indicates that (a) all records in the status register 52-AB are "0" (segments 61-A and 61-B are operating normally). (B) Set segment identifiers “1” and “2” stored in the corresponding records of the communication port register 51-AB to the additional information registers 45-AB and 45-BA, respectively. Along with (c)
Initialization processing for initializing the shift registers 43-AB, 43-BA and the transmission time detection units 44-AB, 44-BA is performed (FIG. 3).
(1)).

Further, the processor 46-AB is arranged to transmit the segments 61-A, 6 through the segment corresponding units 42-A, 42-B.
5-B operation status (for example, whether or not the potential is within a predetermined range, the frequency / time rate of collisions, the distribution of the length of the collision period, etc. (Indicating whether or not there is any), and performing a monitoring process for holding the status indicating the result in the corresponding record of the status register 52-AB at a predetermined frequency (FIG. 3 (2)).

The shift register 43-AB (43-BA)
Is a predetermined number of bits in synchronization with a signal given from the segment 61-A (61-B) via the segment register 42-A (42-B) to the above-mentioned clock [here, for simplicity, It is assumed that “3” {≧ log ₂ 7 (“7” is the total number of segments 61-A to 61-G)}. ], The data is sequentially read by the first-in / first-out method, and the segment corresponding to the segment 61-B (61-A) via the segment corresponding unit 42-B (42-A).
Send to.

In the following, the operation performed by linking the respective parts of the repeater 41-AB as described above will be simply referred to as "relay". That is, since signals are relayed bidirectionally between the segment 61-A and the segment 61-B, the segment 61-A
The terminal 63-A arranged in -A and the terminal 63-B arranged in the segment 61-B mutually send desired information to CSMA /
It can be sent and received based on the CD system.

Repeaters 41-BC, 41-CD, 41-C
About the operation of E, 41-CF, 41-EG, basically,
Since it is the same as the above-mentioned relay performed in the repeater 41-AB, its explanation is omitted here.

In the repeater 41-AB, the terminal 63-G
From repeater 41-EG, segment 61-E, repeater 4
The delayed arriving signal and jam signal arriving via the 1-CE, the segment 61-C, the repeater 41-BC and the segment 61-B, the segment corresponding section 42-B, the shift register 43-BA and the segment corresponding section 42- It is transmitted to the segment 61-A via A.

Further, the shift register 43-AB sequentially captures and stores the jam signals sent from the terminal 63-A almost at the same time through the segment corresponding unit 42-A, and stores the jam signals through the segment corresponding unit 42-B. It is transmitted to each segment after the segment 61-B. In addition, the segment corresponding part 42
-A is a potential of the segment 61-A (a period in which any of a plurality of terminals among the terminals connected to the segment 61-A and the repeater 41-AB (segment corresponding part 42-A) transmits in parallel) , Which results in an irregular value.), The potential collision on the segment 61-A is monitored, and the result is notified to the processor 46-AB as appropriate.

In the course of the above-mentioned monitoring processing, the processor 46-AB obtains the above-mentioned collision frequency based on the notified results (FIG. 3 (3)), and the frequency is set to a preset upper limit. When the value exceeds the value, an activation request to that effect is given to the sending time detection unit 44-AB (FIG. 3 (4)). When such a start request is given, the sending time detection unit 44-AB determines that the bit string accumulated in the shift register 43-AB is a known bit string corresponding to a jam signal (in hexadecimal, the above-mentioned "55 ... , Or “AA ...”) is repeated in a cycle equal to or shorter than the clock cycle, and when the result of the judgment changes from true to false, the load synchronized with the clock is performed. The signal is given to the shift register 43-AB.

When the load signal is given to the shift register 43-AB, the segment identifier "1 (binary number" 001 ")" held in the additional information register 45-AB is fetched in parallel, and the subsequent sequence is performed. The segment identifier is sequentially read out in synchronization with a given clock.

The segment identifier thus read out is, as shown in FIG. 6A, a segment corresponding portion 42 as a bit string added to the end of the preceding jam signal.
-B through segment 61-B and under repeater 41-BC, 41-CD, 41-CE, 41-CF, 41-EG under relay as described above. ~
61-G and terminals 63-B to 63-G arranged in these segments 61-B to 61-G, respectively.

That is, when there are many collisions in the segment 61-A, the segment identifier "1" indicating the segment 61-A is added as the bit string "001" added to the end of the jam signal to the segments 61-B to 61-B. -Transmitted to G sequentially. Therefore, according to the present embodiment, in these segments 61-B to 61-G, a device that enables observation of the format and contents of the packet transmitted / received via the desired segment (for example, the LAN protocol described above). The analyzer 61) is connected to the segment 61-A where collisions frequently occur, as described above, without changing the segment to which the device should be connected or performing unnecessary trial and error.
Can be specified with high accuracy.

The second embodiment of the present invention will be described below. The difference between the present embodiment and the first embodiment is that the repeaters 41-AB, 41-BC, 41-CD, 41-CE,
Repeaters 41A-AB, 41A-in place of 41-CF, 41-EG
BC, 41A-CD, 41A-CE, 41A-CF, and 41A-EG are provided, respectively.

The difference in configuration between the repeater 41A-AB and the repeater 41-AB is that the additional information register has a load terminal of the shift register 43-AB and a control terminal connected to the control terminal of the sending time detecting section 44-AB. 45A-AB and an additional information register 45A-BA having a control terminal connected to the control terminal of the sending time detection unit 44-BA together with the load terminal of the shift register 43-BA are additional information registers 45-AB and 45A, respectively. -It is in place of BA.

The repeaters 41A-BC, 41A-CD,
For the configuration of 41A-CE, 41A-CF, 41A-EG,
Repeater 41-BC, 41-CD, 41-CE, 41-CF, 41-E
Since the configuration is the same as that of G, its description is omitted here. The operation of the second embodiment of the present invention will be described below with reference to FIGS.

The difference between the present embodiment and the first embodiment lies in the procedure of the following processing performed by the processor 46-AB for the repeater 41A-AB, for example. Repeater 4
When the 1A-AB recognizes that the frequency of collisions occurring on the segment 61-A exceeds the upper limit value based on the monitoring result notified by the segment corresponding section 42-A, the sending time detection section 44 -Before the process of giving a start request to AB, in addition to the already-described segment identifier "1", an event identifier indicating that (in this case, if it is represented by 1 bit whose logical value is "1", Is assumed) in the additional information register 45A-AB (FIG. 3 (a)).

When the above-mentioned activation request is given, the sending time detector 44-AB determines whether the bit string accumulated in the shift register 43-AB corresponds to the known bit string corresponding to the jam signal. The determination is repeatedly performed at a cycle equal to or less than the clock cycle, and when the determination result changes from true to false, two load signals are sent at the clock cycle to the additional information registers 45A-AB and the shift register 43.
-Give to AB.

Further, the additional information registers 45A-AB are
Of these load signals, when the first load signal is given, only the segment identifier “1” described above is shifted to the shift register 43-in the same manner as the embodiment corresponding to the invention described in claims 1 and 2. Give to AB.

However, when the second load signal is given, 3 which constitutes the above-mentioned segment identifier "1" is formed.
Of the bits, the lower 2 bits and the above-mentioned event identifier “1”
3 bits consisting of and are given to the shift register 43-AB. On the other hand, the shift register 43-AB receives information (segment identifier “1” (binary number “00” given from the additional information register 45-AB each time these load signals are given.
1)) "or a combination of the lower 2 bits of the segment identifier and the event identifier) is taken in parallel, and the segment identifier is sequentially read out in synchronization with the clock given subsequently.

The segment identifier and the event identifier thus read out are, as shown in FIG. 6B, passed through the segment corresponding section 42-B as a bit string added to the end of the preceding jam signal. Sent to segment 61-B and repeaters 41-BC, 41-CD, 41-CE, 41-CF,
41-EG and the segments 61-B to 61-G and the segments 61-B to
61-G to 63-B to 63-G respectively.

That is, when collisions occur frequently in the segment 61-A, the segment identifier "1" indicating the segment 61-A and the event identifier "1" indicating such an event are added at the end of the jam signal. The added bit string "0011" is sequentially transmitted to the segments 61-B to 61-G. Therefore, according to the present embodiment, in the segments 61-B to 61-G, the LAN protocol analyzer and other devices are applied, so that the segment to which the device is connected and unnecessary trial and error are performed. Without doing so, it becomes possible to identify the segment 61-A in which collisions frequently occur as described above and such an event with high accuracy.

Hereinafter, the first aspect of the present invention will be described with reference to FIGS.
The operation of the third embodiment will be described. The difference between the present embodiment and the first embodiment is, for example, the operation of the sending time detector 44-AB shown below for the repeater 41-AB.

The sending time detector 44-AB is the processor 4
When the activation request is given by the 6-AB, claims 1 and 2 are given.
Similar to the embodiment corresponding to the invention described in (1), it is determined whether or not the bit string accumulated in the shift register 43-AB corresponds to the known bit string corresponding to the jam signal at a cycle of the clock cycle or less. Do iteratively. Further, when the result of such determination changes from true to false, the sending time detection unit 44-AB has three clocks over the preset number N (≧ 2) of the shift register 43-AB. A load signal is given every cycle.

The shift register 43-AB has a segment identifier "1 (binary" 001 ")" held in the additional information register 45-AB each time these load signals are given.
Are read in parallel, and the segment identifiers thereof are sequentially read out in synchronization with the clock given subsequently. The segment identifier read in this way is shown in FIG.
As indicated by a dotted line in FIG. 5, the segment corresponding part 42 is added as a redundant bit string to the end of the preceding jam signal.
-B through segment 61-B and under repeater 41-BC, 41-CD, 41-CE, 41-CF, 41-EG under relay as described above. ~ 6
1-G and terminals 63-B to 63-G arranged in these segments 61-B to 61-G, respectively.

That is, when there are many collisions in the segment 61-A, the segment identifier "1" indicating the segment 61-A is added as a bit string "001" added to the end of the jam signal to the segments 61-B to 61-B. -Sent to G multiple times N times. Therefore, segment 6
In 1-B to 61-G, for example, by connecting a device, such as a LAN protocol analyzer, which can observe the format and contents of a packet transmitted / received via a desired segment, the segment 1 -B to 61-G, regardless of the timing of the collisions that may occur asynchronously, the segment 61-A that has a high probability of collision and has higher accuracy than the embodiment corresponding to the invention according to claims 1 and 2. It becomes possible to specify.

In this embodiment, the invention according to claim 3 is applied to the first embodiment.
When it is required that both such events can be identified with high accuracy in addition to the segments where collisions frequently occur, the transmission time detection unit 44 is provided every three clock cycles.
-AB repeats the operation of sending out the two load signals described above, and the additional information register 45A-AB performs the operation described above, so that the segment identifier is combined with the segment identifier as shown in FIG. 6 (c). , Event identifiers may be sent in sequence.

Further, in each of the above-mentioned embodiments, when collisions occur frequently in the segment 61-A, the segment 61-A
A jam signal with a segment identifier "1" indicating -A added to the end is transmitted to the segment 61-B. However, such a segment identifier "1" may be transmitted to the segment 61-A in which the frequency of collision exceeds the upper limit value.

Further, in each of the above-mentioned embodiments, the segment identifier and the event identifier are added to the end of the jam signal and transmitted to the predetermined segment. However, such a segment occurs, for example. It may be appropriately switched depending on the event, the segment identifier to be added to the end of the jam signal, the format of the event identifier, and the like.

Further, in each of the above-described embodiments, the segment identifier indicating the segment in which collisions frequently occur is added to the end of the jam signal and transmitted, but such a segment identifier can be used to identify a desired segment. If it is unique information provided, for example: Repeater 41-AB, 41-BC, 41-CD, 41-CE, 41-C
F, 41-EG (41A-AB, 41A-BC, 41A-CD, 41A-CE,
41A-CF, 41A-EG) have port numbers pre-assigned to the individual ports, these repeaters 41-AB, 41-BC, 41-CD, 41-C
E, 41-CF, 41-EG (41A-AB, 41A-BC, 41A-CD, 4
1A-CE, 41A-CF, 41A-EG) serial number and any other information.

Furthermore, in each of the above-described embodiments, the shift registers 43-AB, 43 having a 3-bit length or a 4-bit length are provided.
-BC, 43-CD, 43-CE, 43-CF, 43-EG, 43-BA, 43-C
B, 43-DC, 43-EC, 43-FC, 43-GE are provided. However, these shift registers 43-AB, 43-BC,
43-CD, 43-CE, 43-CF, 43-EG, 43-BA, 43-CB, 4
The length of 3-DC, 43-EC, 43-FC, and 43-GE is allowable under the number of stages of segments arranged in multiple stages or the propagation delay time of repeaters placed between these segments. If the size is not large enough, it may be appropriately shortened.

In such a case, the repeater 41
-AB, 41-BC, 41-CD, 41-CE, 41-CF, 41-EG (41A
-AB, 41A-BC, 41A-CD, 41A-CE, 41A-CF, 41A
-EG) hardware, in addition to the segment identifiers and event identifiers described above, as long as some or all of the jam signals preceding these segment identifiers and event identifiers are given, that jam signal is given instead of the segment. It may be configured as a signal source.

FIG. 7 is an operation flowchart of the fourth embodiment of the present invention . The operation of the fourth embodiment of the present invention will be described below with reference to FIGS. 2 and 4 to 6. The difference between this embodiment and the first to third embodiments is that the repeater 41
-AB, 41-BC, 41-CD, 41-CE, 41-CF, 41-EG
(41A-AB, 41A-BC, 41A-CD, 41A-CE, 41
A-CF, 41A-EG), or segments 61-A to 61-
The terminals 63-A to 63-G respectively disposed in G perform the following processing.

For the sake of simplicity, such a process will be repeated in the following with the repeaters 41-AB, 41-BC, 41-CD,
41-CE, 41-CF, 41-EG (41A-AB, 41A-BC, 4
1A-CD, 41A-CE, 41A-CF, 41A-EG) and terminals 63-B to 63-G, repeater 41-BC and terminal 6
The explanation will be limited to 3-B only. Also, the terminal 6
As shown in FIG. 2, the 3-B has a communication interface unit 47-B and a processor 48-B corresponding to the segment corresponding unit 42-B and the processor 46-AB provided in the repeater 41-BC, respectively. Be prepared.

Further, since the terminals 63-A and 63-C to 63-G have the same construction as the terminal 63-B, the subscripts "A", "C" to "C" are added to the corresponding constituent elements. The same reference numeral with “G” added is given, and the description and illustration thereof are omitted here. Repeater 41-BC (terminal 61
-B), the segment corresponding unit 42-B (communication interface unit 47-B) does not use the CSMA for the segment 61-B.
Processing relating to transmission and reception based on the / CD system is performed under the initiative of the processor 46-AB (48-B).

Further, when the segment corresponding unit 42-B (communication interface unit 47-B) receives the jam signal described above from the segment 61-B in the course of such processing,
Synchronization is established by identifying the bit string “0101 ...” Or “1010 ...” (in hexadecimal notation, given as “55 ...” or “AA ...”) forming the jam signal as a preamble signal. , The 3-bit (or 4-bit) bit string added to the end of this jam signal is fetched.

The processor 46-AB (48-B) uses such a bit string based on the above-described format (3 bits consisting only of the segment identifier or 4 bits consisting of the segment identifier and the event identifier added thereto). Analyzed (Fig. 7
(1)), and a predetermined form is output to a display unit (not shown) provided in the repeater 41-BC (terminal 61-B) (FIG. 7 (2)).

That is, the repeater 41-BC (terminal 61-
B) causes the processor 46-AB (48-B) to execute the software stored in the surplus storage area of the main memory, so that the segments 61-A to 61-A in the first to third embodiments.
In place of the LAN protocol analyzer to be connected to the 61-G, a segment identifier indicating the segment 61-A in which collisions frequently occur and an event identifier meaning the frequent collisions are identified, and the segment identifier and the event identifier Takes a man-machine interface for notifications.

Therefore, the identification of the segment in which collision frequently occurs can be efficiently and accurately achieved without applying the LAN protocol analyzer and other devices. In each of the above-described embodiments, the repeater 41-A is used.
B, 41-BC, 41-CD, 41-CE, 41-CF, 41-EG (4
1A-AB, 41A-BC, 41A-CD, 41A-CE, 41A-C
F, 41A-EG), the inventions of claims 1 to 5 are applied to these repeaters 41-AB, 41-BC, 41-CD,
41-CE, 41-CF, 41-EG (41A-AB, 41A-BC, 4
1A-CD, 41A-CE, 41A-CF, 41A-EG) or terminals 61-B to 61-G, the invention of claim 4 is applied.

However, according to the present invention, such 41-AB,
41-BC, 41-CD, 41-CE, 41-CF, 41-EG (41A-AB,
41A-BC, 41A-CD, 41A-CE, 41A-CF, 41A-EG)
And terminals 61-B to 61-G as well as CSMA / C
In the case of a network to which the D method is applied, for example, a hub for concentrating in a LAN of the peer-to-peer method, a data link layer in the OSI reference model, or a MAC (Medium Acc) compliant with the IEEE802.3 standard
The same can be applied to a bridge that takes an interface (including filtering) between networks in the ess control layer, and a router that routes packets in the network layer in the OSI reference model.

Regarding the inventions described in claims 1 to 5 , when applied to the terminals 63-A to 63-G,
Repeater 41-AB, 41-BC, 41-CD, 41-CE, 41-C
F, 41-EG (41A-AB, 41A-BC, 41A-CD, 41A
-CE, 41A-CF, 41A-EG) instead of the repeaters 62-AB, 62-BC, 62-CD, 62-CE, 62-CF shown in FIG.
Each 62-EG may be provided.

Further, in such a case, the terminal 63-A
63-G are the senders of the segment identifier and the event identifier in addition to the jam signal described above. Therefore, these terminals 63-A to 63-G are provided with, for example, the repeater 41.
-Corresponds to shift registers 43-AB and 43-BA provided in AB, sending time detection units 44-AB and 44-BA, and additional information registers 45-AB (45A-AB) and 45-BA (45A-BA) The constituent elements may not be provided, and the functions of these constituent elements may be realized by hardware that operates under the control of software that realizes communication control and that forms a communication port.

In each of the above embodiments, CSMA
Although the present invention is applied to a LAN to which the / CD method is applied, the communication procedure, transmission efficiency, maintenance / operation, etc. due to the addition of the segment identifier and event identifier described above to the end of the jam signal. If there is no restriction in terms of, or if the degree of such restriction is acceptable, for example: -Each terminal sends a jam signal for a predetermined period before starting transmission, and CSM that confirms that there was no collision over
A / CA (Carrier Sense Multiple Access with Colli
CSI (Carrier Sense Multiple Access) method (non-persistent method, p-persistent method) in which each terminal confirms that the connected segment is not occupied by another terminal and transmits The present invention can be applied to a network to which the system is applied.

Further, in each of the above-mentioned embodiments, a segment identifier indicating the segment 61-A in which collisions frequently occur,
Although the event identifier indicating the frequent occurrence of the collision is added to the end of the jam signal and transmitted, the invention of the present application is not limited to such frequent occurrence of the collision, and, for example ,: repeaters 41-AB, 41-BC, 41-CD, 41-CE, 41-C
F, 41-EG (41A-AB, 41A-BC, 41A-CD, 41A-CE,
41A-CF, 41A-EG), or a desired event (segments 61-A to 61-G) that occurs inside the terminals 61-A to 61-G.
Also includes things that have nothing to do with. ), ・ Even for late collisions detected by these terminals 61-A to 61-G, even if it is applied to enable identification of the place (or detected) where it occurred or the corresponding event, Good.

Further, in each of the above-described embodiments, the core of the jam signal is relayed, for example, via the shift register 43-AB provided in the repeater 41-AB. However, the present invention is not limited to such a configuration, and for example,
A part or all of the jam signal given from one segment may be replaced with an alternative jam signal generated together with the segment identifier and the event identifier described above, and sent to the other segment.

[0075]

As described above, the first and fifth aspects are provided.
In the invention described in (1), even when the network is composed of multiple segments arranged in multiple stages, in these segments, the location where a specific event occurs via the equipment used for signal monitoring. Is accurately achieved. It
Moreover, in the invention according to claim 1, proper maintenance and operation
It will be possible.

In addition, in the inventions according to claims 2 and 5 , together with the segments and communication links that intervene with the candidates that should be notified of the alarm information, the operation of the devices that should be these candidates is activated. It is possible to handle faults flexibly adapted to the situation. Furthermore, in the invention according to claim 3, either
Transmission quality is degraded or
Even if a collision or obstacle occurs, the alarm information is
It is transmitted to the segment with high accuracy.

In the invention according to claim 4, a separate body is provided.
Alarm information configures the network without being applied
It is transmitted in parallel to each segment with high accuracy. Therefore, in the network to which these inventions are applied, the cost and man-hours involved in maintenance and operation can be significantly reduced, and the overall reliability can be improved.

[Brief description of drawings]

FIG. 1 is a principle block diagram of the invention described in claims 1 to 5.

FIG. 2 is a diagram showing first to fourth embodiments of the present invention .

FIG. 3 is an operation flowchart of the first to third embodiments of the present invention .

FIG. 4 is a diagram showing a configuration of a communication port register.

FIG. 5 is a diagram showing a configuration of a status register.

FIG. 6 is a diagram showing a format of an alarm packet.

FIG. 7 is an operation flowchart of the fourth embodiment of the present invention .

FIG. 8 is a diagram showing a configuration example of a LAN extended via a repeater.

FIG. 9 is an operation flowchart of a conventional example.

[Explanation of symbols]

11 segment support 12 Monitoring means 13 Alarm means 21 identifier acquisition means 22 Man-machine interface means 41,62 repeaters 42 segment support section 43 shift register 44 Sending time detector 45 Additional information register 46,48 processors 47 Communication interface section 51 Communication port register 52 Status register 61 segments 63 terminals

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP 58-88948 (JP, A) JP 3-57341 (JP, A) JP 6-188887 (JP, A) JP 4- 361447 (JP, A) JP 8-18580 (JP, A) JP 59-99842 (JP, A) JP 9-284304 (JP, A) JP 5-344126 (JP, A) (58) Fields surveyed (Int.Cl. ⁷ , DB name) H04L 12/00-12/28 H04L 12/44-12/66

Claims (5)

(57) [Claims] 1. Connected to a single or a plurality of segments forming a network to which the CSMA system is applied, and realizing a function of a transmission source or a reception destination of transmission information and any of concentrating, relaying, filtering and routing. Segment corresponding means having all or part of the function, and monitoring means for monitoring the single or multiple segments or the segment corresponding means and detecting a specific event occurring in these segments or the segment corresponding means When the specific event is detected by the monitoring means, a jam signal adapted to the CSMA method and a tail signal of the jam signal are added to all or part of the single or plural segments , A first identifier that indicates where the particular event occurred, and a first identifier that identifies this particular event.
A node device, comprising: alarm means for transmitting alarm information including the second identifier . 2. The node device according to claim 1, wherein the alarm means is single or plural based on a specific event detected by the monitoring means and / or the degree of the specific event. The node device having means for selecting a segment to which the alarm information is to be transmitted, from among the above segments. 3. The node device according to claim 1 or 2, wherein the alarm means is a dual identifier including a first identifier and a second identifier included in the alarm information.
One or either in redundant form, or redundant code
A node device characterized by being added to the end of the jam signal as a signal . 4. The node device according to claim 1 , wherein all or part of a single segment or a plurality of segments are provided.
Synchronize with the jam signal that can be obtained,
Both the first and second identifiers added to the end
Alternatively, an identifier acquisition unit that acquires one of the two, and a first identifier acquired by the identifier acquisition unit
Either or both of the second identifier and
Mammashi with man-machine interface related to knowledge
Node device characterized by comprising a down interface means. 5. A network to which the CSMA method is applied is constructed.
Connects to single or multiple segments and sends transmission information
The function of the sender or receiver, and the concentrating, relaying, filtering
With the ability to implement either routing or routing
Segment corresponding means having all or a part thereof, and the single or plural segments or the segment.
Monitor these measures and
Monitors that detect specific events that occur in segment-aware
Means and when the specific event is detected by the monitoring means
All or one of the single or multiple segments
And a jam signal adapted to the CSMA method,
At the end of the jam signal, indicate where this particular event occurred.
If you send the alarm information with the first identifier added,
Both, the specific event detected by the monitoring means and its
Single or multiple, based both on the extent of a particular event
Of the segments of which the alarm information should be sent
And a warning unit having a unit for selecting a node.