JPH10322337A - Network connection optimizing device and its method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an optimum wiring state to ensure a band required for data transmission. SOLUTION: A transmission data band detection section 7 ensures a band required for data transmission. A transfer capability detection section 6 receives a node ID and master plug register MPR data from a 1394 link layer section 3 to detect a maximum transfer capability of a node on the way of a path up to a receiver. A band reserve discrimination section 8 discriminates whether or not a band is reserved based on an output of a transmission data band detection section 7 and the transfer capability detection section 6. In the case that the band cannot be reserved, a notice section 12 makes a notice section 12 makes a notice and a wiring revision method decision section 15 decides an optimum wiring state. The wiring state is fed from the notice section 12 to a display processing section 13 to allow the required wiring state to be displayed on a screen of a display device 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a network connection optimizing device and a network connection optimizing method suitable for a digital interface or the like.

[0002]

2. Description of the Related Art In recent years, IEEE1394 has been used as an interface system for multimedia applications suitable for image data.
Is attracting attention. IEEE 1394 is described in detail in Japanese Patent Application Laid-Open No. 8-279818.

[0003] Unlike computer data, image data needs to be transmitted in real time at a constant period (hereinafter referred to as synchronous transmission). The IEEE 1394 has an isochronous transfer function capable of performing multiplex transfer of a plurality of channels and guaranteeing transfer of video and audio data within a predetermined time.
Suitable for image transmission.

[0004] In IEEE1394, tree-like and daisy-chain-like topologies can be adopted. Cables that comply with the IEEE 1394 standard
Devices connected by a 1394 cable) can transmit data via an interface that conforms to the IEEE 1394 standard (hereinafter, an IEEE interface). The IEEE interface controls a physical layer and a data link layer of an OSI (Open System Interconnection) reference model, and has a transfer rate of 400 Mbps, 200 Mbps, or 100 Mbps.
3 modes of bps are defined.

[0005] By the way, the IEEE interface is 3
Not all modes are supported. For example, some of them support only a transfer rate of 100 Mbps. Therefore, among the plurality of devices connected by the 1394 cable, a device having a low transfer capability may be connected in the middle of the path between the transmitting device and the receiving device. Then,
The transmission capability of the transmitting device and the receiving device is 400
Even at Mbps, the transfer performance is limited to the performance of a device having a low transfer capability along the route, and only a transfer speed of, for example, 100 Mbps can be obtained.

[0006]

As described above, heretofore, there has been a problem that a relatively low-speed device connected in the middle of a route may not be able to obtain a sufficient transfer speed.

The present invention has been made in view of such a problem, and a network connection that can improve a transfer speed when a relatively low-speed device is included in a network by optimizing a topology. It is an object to provide an optimization device and a network connection optimization method.

It is another object of the present invention to provide a network connection optimizing apparatus and a network connection optimizing method capable of presenting an optimized topology to a user.

[0009]

According to a first aspect of the present invention, there is provided a network connection optimizing apparatus comprising:
Transfer capability detecting means provided at the first node for detecting the transfer capability of each node from the first node to the second node on the network; and transmission from the first node to the second node. Band detection means for detecting a band required for data transmission, and whether or not a band required for transmission of the transmission data can be secured based on a detection result of the transfer capability detection means and a detection result of the band detection means. Bandwidth securing determining means for determining, wiring change determining means for creating a topology change plan indicating a topology change of the network in order to secure a bandwidth required for transmission of the transmission data, and determination by the bandwidth securing determining means And a presenting means for presenting at least one of the result and the topology change plan created by the wiring change determining means. The network connection optimization method includes a band detection procedure for detecting a band required for transmission of transmission data from a first node to a second node on a network, and a second band detection procedure from the first node on the network. Transfer capability detection procedure for detecting the transfer capability of each node up to the node of
A band securing determination procedure for determining whether a band required for transmission of the transmission data can be secured based on the detection result of the band detection procedure and the detection result of the transfer capability detection procedure,
When it is determined that the bandwidth required for transmission of the transmission data cannot be secured by the bandwidth securing determination procedure,
A first presentation procedure for presenting the determination result, a wiring change determining procedure for creating a topology change plan indicating a topology change of the network in order to secure a band required for transmission of the transmission data, and the wiring And a second presentation procedure for presenting the topology change plan created in the change determination procedure.

[0010] In claim 1 of the present invention, the transfer capability detecting means provided at the first node detects the transfer capability of each node up to the second node. First node to second
When transmitting transmission data to the node, the band detecting means detects a band necessary for transmission of the transmission data. The band securing determination unit determines whether a band required for transmission of transmission data can be secured based on the detection results of the transfer capability detecting unit and the band detecting unit. If the determination result of the bandwidth securing determining means indicates that the bandwidth cannot be secured, the wiring change determining means prepares a topology change plan for changing the network topology so that the bandwidth can be secured. create. At least one of the determination result of the bandwidth securing determination unit and the topology change plan is presented to the user by the presentation unit.

According to a sixth aspect of the present invention, a band necessary for transmission of transmission data is detected in a band detection procedure.
In the first node, the transfer capability of each node up to the second node is detected. In the band securing determination procedure, it is determined whether a band required for transmission of transmission data can be secured. The determination result indicating that the band cannot be secured is presented to the user. On the other hand, in the wiring change determination procedure, a topology change plan is created in order to secure a band required for transmission of transmission data. This topology change plan is presented to the user in the second presentation procedure.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the network connection optimizing device according to the present invention.

[0013] The network connection optimizing device 1 is 1394
It is connected via a cable 4 to a plurality of other devices (not shown). The 1394 cable 4 is connected to an interface 9 corresponding to the IEEE 1394 standard. The interface 9 performs processing of the physical layer of the OSI reference model 1
394 Physical layer part 2 and data link layer processing 13
It comprises a 94 link layer unit 3. Note that 13
The 94 cable is connected to a 1394 interface of another device (not shown).

The 1394 physical layer 2 defines the serial signal encoding method and electrical specifications, and performs bus arbitration for arbitrating bus usage rights and notifies the entire bus of traffic conditions. The 1394 link layer 3 defines a low-level protocol for reading and writing data, and exchanges data with the signal processing unit 5.

The signal processing section 5 performs predetermined signal processing on the transmission data, and outputs synchronous data such as image data to the 1394 link layer section 3 as isochronous data.
The output of the signal processing unit 5 is also provided to the transmission data band detection unit 7. The transmission data band detection unit 7 detects a band necessary for transmitting isochronous data output from the signal processing unit 5 and outputs a detection signal to the band securing determination unit 8.

By the way, in IEEE 1394,
The bus reset is automatically performed by connecting the device to the 1394 cable 4 and turning the device on and off. In IEEE 1394, a parent-child relationship is determined by bidirectionally transferring signals between devices of each node via a bus (1394 cable 4), and an ID of each device is also determined. Further, the interface 9 of each device has an input / output master plug register (not shown), and in IEEE1394, the contents of the master plug register (hereinafter, referred to as MPR data) are transmitted in response to a request. It has become.

FIG. 2 shows the MPR data.
2A shows the contents of an output master plug register, and FIG. 2B shows the contents of an input master plug register.

As shown in FIGS. 2A and 2B, the output and input master plug registers are 2-bit data.
It holds the rate capability (shaded area). This data
The rate capability indicates the maximum data transfer rate of the interface 9.

The 1394 link layer 3 is connected to the node I which is fetched from the 1394 cable via the 1394 physical layer 2.
D and MPR data are output to the transfer capability detector 6. The 1394 link layer unit 3 may receive the node ID and the MPR data of the device on the way to the device that receives the transmission data. The transfer capability detection unit 6 determines the current transfer capability of each node based on the input node ID and MPR data, and outputs a result of the determination to the band securing determination unit 8.

The band securing judgment unit 8 compares the detection result from the transmission data band detection unit 7 with the judgment result from the transfer capability detection unit 6 to transmit the isochronous data from the signal processing unit 5 in the current connection state. It is determined whether a necessary band can be secured. Band securing determination unit 8
When the band cannot be secured, a band securing signal indicating that the band cannot be secured is output to the notifying unit 12 and the wiring change determining unit 15.

The wiring change determining unit 15 includes a wiring optimizing unit 10 and a wiring change number detecting unit 11. The wiring optimization unit 10 also receives a determination result of the transfer capability of each node from the transfer capability detection unit 6 (not shown). Wiring optimization unit 10
When a band securing signal is input from the bandwidth securing determining unit 8, the topology is optimized and the data transfer speed to the receiving device is maximized in order to secure the band required for isochronous data transmission. And outputs it to the wiring change number detection unit 11.

The wiring change number detection unit 11 detects the number of wiring changes required when a wiring change is made based on the optimization plan, and feeds back the detection result to the wiring optimization unit 10. Based on this detection result, the wiring optimization unit 10 determines an optimal topology, and outputs it to the notification unit 12 via the wiring change number detection unit 11 as a wiring state signal.

When the band securing judgment signal is supplied from the band securing judging unit 8, the notifying unit 12 gives a notification indicating that the band necessary for transmitting the isochronous data cannot be secured in the current wiring state. Is output to the display processing unit 13. Further, when a wiring state signal indicating a wiring state enabling transmission of isochronous data is input, the notification unit 12 outputs a signal for notifying the wiring state to the display processing unit 13. I have.

The display processing unit 13 performs a predetermined display process for performing a display based on a signal from the notification unit 12. For example,
The display processing unit 13 has a character memory that stores character data indicating each device, character data indicating wiring, character data, and the like, reads character data based on a signal from the notification unit, and cannot secure a band. , A display indicating the current wiring state, a display indicating a wiring state enabling the band to be secured, and the like are generated. Display processing unit 13
Is supplied to the display device 14. Display device
14 is designed to display on the screen based on the display data.

Next, the operation of the embodiment configured as described above will be described with reference to FIGS. FIG. 3 is a flowchart showing the operation of the embodiment, FIGS. 4 and 8 are explanatory diagrams for explaining the change of the wiring state, and FIGS. 5 to 7 are for explaining the display on the display device 14. FIG. FIG. 4A shows the current wiring state,
FIGS. 4B to 4D show wiring states after optimization.

Now, as shown in FIG. 4A, four devices provided with a network connection optimizing device having the same configuration as the network connection optimizing device 1 of FIG. It is assumed that B, C, and D are connected in a daisy chain via a 1394 cable 4. The maximum transfer rates that can be transmitted by the interface 9 of the network connection optimization device 1 in the nodes A to D are 400 Mbps, 400 Mbps, and 100 Mbps, respectively.
ps, 400 Mbps.

Here, the nodes A and D located at both ends of the daisy chain form a transmitter and a receiver, respectively.
Data transmission shall be performed. The signal processing unit 5 of the network connection optimization device 1 in the node A outputs the isochronous data to be transmitted to the interface 9 and also outputs to the transmission data band detection unit 7. In step S1 of FIG. 3, the transmission data band detecting section 7 detects a band required for transmitting isochronous data, and outputs a detection result to the band securing determining section 8.

On the other hand, the 1394 link layer unit 3 transmits a signal to the node on the route to the node D, which is the transmission destination of the isochronous data to be transmitted, ie, the nodes B to D.
The transfer of the node ID and the MPR data is requested via the cable 94. The node ID and the MPR data from the nodes B to D are supplied to the network connection optimizing device 1 of the node A via the 1394 cable 4,
The data is supplied to the 1394 link layer unit 3 via the 1394 physical layer unit 2. The 1394 link layer unit 3 decodes the transmitted data and provides the decoded data to the transfer capability detection unit 6.

In step S2, the transfer capability detecting unit 6 determines each of the nodes B to D from the node ID and the MPR data.
Is detected, and the current transfer capability of data from the node A to the node C in the current connection state is determined. In this case, the transfer capability detecting unit 6 determines the maximum transfer capability that can be transferred using the remaining band of the band currently used.

The result of the determination by the transfer capability detecting section 6 is given to the band securing determining section 8. The band securing determination unit 8 determines in step S
3, it is possible to secure the band required for the current transmission of isochronous data based on the current maximum transfer capability from the node A to the node D and the detection result of the band required for transmitting the isochronous data from the signal processing unit 5. Determine if you can. If the result of this determination indicates that the band required for data transmission can be secured, the process is terminated from step S4.

Assuming that the bandwidth in use is 50 Mbps and the bandwidth required for transmitting the isochronous data from the signal processing unit 5 of the node A is 150 Mbps, the wiring state shown in FIG. This isochronous data cannot be transmitted. In this case, the process shifts from step S4 to step S5.
Notify the user that the required bandwidth cannot be secured.
That is, the band securing determination unit 8 transmits the band securing impossible signal to the notifying unit 12.
Output to The notification unit 12 outputs to the display processing unit 13 a signal for notifying that the band cannot be secured. Display processing unit
13 causes the display device 14 to display a display indicating that the band cannot be secured.

On the other hand, the band securing signal from the band securing determining unit 8 is also supplied to the wiring changing method determining unit 15. In step S6, the wiring optimizing unit 10 of the wiring change method determining unit 15 optimizes the wiring state from the node A to the node D in order to secure a band required for transmitting isochronous data. For example, the wiring optimization unit 10 optimizes the wiring state such that only the node having the interface 9 with high transfer capability is arranged in the middle of the path between the nodes A and D.

In the example of FIG. 4, the wiring optimization unit 10 moves the node C having a low transfer capability so as not to be located in the middle of the path between the nodes A and D, and as shown in FIG. , B, D, and C in this order are output as an optimization plan for wiring in a daisy chain. Note that FIG. 4B shows the data sorted and rearranged in the descending order of transfer capability. FIG.
By changing the wiring in the state of (b), data can be transferred from the node A to the node D at a maximum transfer rate of 400 Mbps. Accordingly, the bandwidth in use is 50 Mbps, and the bandwidth required for transmitting the isochronous data from the signal processing unit 5 of the node A is 150 Mbps.
Even in the case of bps, the transfer of the isochronous data from the node A to the node D is possible if the wiring state is as shown in FIG. Note that the wiring optimization unit 10 may output an optimization plan for wiring, for example, in the order of nodes A, D, B, and C.

The wiring change number detecting unit 11 includes a wiring optimizing unit 10
The number of wiring changes required for each optimization plan is calculated and fed back to the wiring optimization unit 10. Thereby, the wiring change method determination unit 11 outputs the optimization plan with the smallest number of wiring changes to the notification unit 12 as a wiring state signal. Notification section 12
Supplies a signal based on the wiring state signal to the display processing unit 13, and the display processing unit 13 creates display data for performing screen display based on the wiring state signal. This display data is
14 to notify the user as a wiring change method necessary to enable the transmission of isochronous data.

FIG. 5 shows a display example in this case.

A wiring change proposal display section 21 is displayed on the display screen. In the wiring change plan display section 21, the current wiring state is schematically displayed on the upper side, and the wiring change plan enabling transmission of isochronous data is schematically displayed on the lower side. In the wiring change proposal display section 21 of FIG.
Are indicated by boxes 22 to 25, and the 1394 cable is indicated by line 26 connecting boxes 22 to 25. According to the display in the frames 22 to 25, the devices of the nodes A to D
TR, set-top box, DVD (Digital Video Disc Player) and television receiver, and the maximum transfer rate of these devices is 4
00Mbps, 400Mbps, 100Mbps and 4
It is also shown that the transmission speed is 00 Mbps. Further, the transmitter and the receiver are displayed with, for example, diagonal lines.

The user can know the current maximum transfer capability of the nodes A to D and the wiring change method for enabling the transmission of isochronous data by displaying the wiring change plan display section 21. it can.

FIG. 6 shows another display example on the display device 14. On the screen, a wiring change proposal display section 31 is displayed. In the wiring change proposal display section 31, the node A
Devices D to D are indicated by frames 22 to 25, and cables connecting the devices are indicated by lines 26, 27, and 28. The wiring change proposal display section 31 displays the current connection state and the changed connection state in the same frame by changing the type of line connecting the frames 22 to 25.

In FIG. 6, the current connection is indicated by a line 26 and a broken line 27, and the new connection is indicated by a line 26 and a thick line 28. That is, FIG. 6 shows that nodes A to D indicated by frames 22 to 25 are sequentially connected.
Further, in order to enable transmission of isochronous data, the connection between nodes B and C shown by boxes 23 and 24 may be released, and nodes B and D shown by boxes 23 and 25 may be newly connected. It is shown. That is, when a new connection is made, the frame 22,
Nodes A, B, D and C indicated by 23, 25 and 24 are sequentially connected.

The user can know the wiring change method for enabling the transmission of the isochronous data by displaying the wiring change plan display section 31.

When the user changes the network connection according to the display of FIG. 5 or FIG. 6, the transmitter of the node A can transmit the isochronous data to the receiver of the node D. Note that the maximum transfer rate between the nodes D and C is 100 Mbps, and there is a possibility that the isochronous data transmitted by the node A may lack data during this period, but the node C does not receive the transmitted data. No problem.

In the example of FIG. 4B, the wiring optimization unit 10 sorts the nodes in the order of the transfer capability and arranges the nodes in descending order of the transfer capability. A method for optimizing the wiring may be obtained by a method. FIG.
(C) and (d) show optimization plans by such other methods.

In IEEE 1394, a network can be divided into a plurality of relatively small local networks using a bus bridge. That is, I
In EEE1394, different local networks can be designated by using different bus IDs for specifying buses. Different local networks will be connected by a bus bridge, and unless otherwise specified, no signal is transmitted to the interfaces of nodes in different local networks.

FIG. 4C shows the bus IDs of the nodes A, B and D.
Is set to 0, the bus ID of the node C is set to 1, and the node C is connected to the node D, so that the nodes A, B, D and the node C are nodes of different local networks. Thus, a maximum of 400 Mb between nodes A and D
Transmission of ps is possible.

FIG. 4D shows an example in which the bus IDs of the nodes A, B, and D are set to 0, the bus ID of the node C is set to 1, and the node C is connected to the node B. . Also in this case, a maximum of 4
Transmission at 00 Mbps is possible.

FIG. 7 shows a screen display in consideration of the example of FIG.

On the display screen, a wiring change proposal display section 41 is displayed. In the wiring change plan display section 41, the current wiring state is schematically displayed on the upper side, and two wiring change plans (a) and (b) for enabling the transmission of isochronous data are displayed on the lower side.
Are schematically displayed. The wiring change plan (a) indicates a daisy-chain connection, and the wiring change plan (b) requires that the device DVD of the node C be set to a different bus ID from the other devices and connected to the set-top box of the node B. Is shown.

The user selects one of the wiring change plans (a) and (b) with reference to the display of the wiring change plan display section 41 in FIG. 7 to change the wiring, thereby obtaining the isochronous data. Transmission can be enabled.

FIG. 4 shows an example in which the topology is configured in a daisy chain.
4, a tree-shaped topology may be adopted. FIG. 8 illustrates an example of this case. FIG. 8A shows the current wiring state, and FIGS.
(C) shows an optimization plan by the wiring change method determination unit 15.

It is assumed that each of the devices of the nodes A to G shown in FIG. 8A has a network connection optimizing device having the same configuration as the network connection optimizing device 1 of FIG. The maximum transfer rates that can be transmitted by the interfaces 9 in the nodes A to G are 100 Mbps, respectively.
400Mbps, 400Mbps, 200Mbps, 1
It is assumed that they are 00 Mbps, 400 Mbps, and 400 Mbps.

Here, it is assumed that the devices of the nodes C and F shown by hatching in FIG. 8A are a transmitter or a receiver, respectively. In the wiring state of FIG. 8A, data from the device of the node C is transmitted to the device of the node F via the path shown by the thick line in FIG. That is, since the device of the node A having the maximum transfer rate of 100 Mbps is connected in the middle of this route, the node C
Only a transfer rate of ps can be obtained.

Therefore, for example, if the currently used band is 50
Assuming that the bandwidth required for transmitting isochronous data from the signal processing unit 5 of the node C is 150 Mbps at Mbps, the transmission of the isochronous data cannot be performed in the wiring state of FIG. In this case, the wiring optimization unit 10 outputs, for example, an optimization plan shown in FIGS. 8B and 8C.

In both cases of FIGS. 8B and 8C,
Obviously, node C can transmit isochronous data to node F at a maximum transfer rate of 400 Mbps.

As described above, in the present embodiment, the maximum transfer rate of each node in the middle of the data transmission path is detected and compared with the band necessary for the transmission of isochronous data, so that the isochronous data is transmitted in the current wiring state. It is determined whether data transmission is possible. If the bandwidth required for isochronous data transmission cannot be secured, the user is notified that the bandwidth cannot be secured, and the wiring change method determination unit 15 determines the wiring that enables the transmission of isochronous data. Detect condition and notify user. With this notification,
The user can know the optimum wiring condition for enabling the transmission of isochronous data.

FIGS. 5 to 7 show an example of monitor display, and it is apparent that other display methods are also conceivable.

Further, in the above-described embodiment, an example in which the wiring state is displayed on the monitor has been described, but any other notification method may be adopted. For example, a display such as an LED (light emitting diode) may be provided near the connector of the device, and the user may be notified by blinking the LED of the device from which the cable is disconnected and the LED of the device to be connected.

Note that, in the above embodiment, the IEEE
Although the description has been made in accordance with the E1394 standard, it is apparent that the present invention is applicable to other digital interfaces capable of synchronous transmission.

[0058]

As described above, according to the present invention, by optimizing the topology, it is possible to improve the transfer speed when a relatively low-speed device is included in the network and to optimize the topology. This has the effect that the topology can be presented to the user.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a network connection optimization device according to the present invention.

FIG. 2 is an explanatory diagram showing MPR data.

FIG. 3 is a flowchart illustrating the operation of the embodiment.

FIG. 4 is an explanatory diagram for explaining operation of the embodiment;

FIG. 5 is an explanatory diagram for explaining operation of the embodiment;

FIG. 6 is an explanatory diagram for explaining operation of the embodiment;

FIG. 7 is an explanatory diagram for explaining operation of the embodiment;

FIG. 8 is an explanatory diagram for explaining operation of the embodiment;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Network connection optimization apparatus, 2 ... 1394 physical layer part, 3 ... 1394 link layer part, 5 ... Signal processing part, 6 ... Transfer capability detection part, 7 ... Data band detection part, 8 ... Band securing judgment part, 9 ... Interface, 10 ... Wiring optimization unit, 11 ...
Wiring number detection unit, 12: notification unit, 13: display processing unit, 14: display device, 15: wiring change method determination unit

Claims (9)

[Claims] 1. A transfer capability detecting means provided at a first node on a network for detecting a transfer capability of each node from the first node to a second node on the network; A band detecting unit for detecting a band necessary for transmission of transmission data from the node to the second node; and a transmission unit for transmitting the transmission data based on a detection result of the transfer capability detection unit and a detection result of the band detection unit. Band securing determination means for determining whether a required bandwidth can be secured, and in order to secure a bandwidth required for transmission of the transmission data,
A wiring change determination unit that creates a topology change plan indicating a change in the topology of the network; and a presentation unit that presents at least one of the determination result of the band securing determination unit and the topology change plan created by the wiring change determination unit. A network connection optimizing device, comprising: 2. The wiring change determining means creates a plurality of topology change plans of the network, and, among the created topology change plans, determines a topology change plan with the smallest number of wiring changes connecting each node on the network. The network connection optimizing device according to claim 1, wherein the network connection optimizing device is selected. 3. The network according to claim 1, wherein said network is IEEE 1394.
The wiring change determination means acquires data indicating a node ID and transfer capability defined in the IEEE 1394 standard, and creates a topology change plan for rearranging nodes in order of transfer capability. The network connection optimizing device according to claim 1, wherein: 4. The network according to claim 1, wherein said network is IEEE 1394.
The wiring change determination unit is configured to determine a node that is a failure in securing a band necessary for transmission of the transmission data by the first and second nodes.
The network connection optimizing device according to claim 1, wherein a topology change plan set to a bus ID different from a bus ID of a bus including the node is created. 5. The network connection optimizing apparatus according to claim 1, wherein the presenting means displays the topology change plan on a monitor. 6. A method according to claim 1, wherein the first node on the network is a second node.
A bandwidth detection procedure for detecting a bandwidth required for transmission of transmission data to the node; a transfer capacity detection procedure for detecting a transfer capacity of each node from the first node to a second node on the network; A band securing determination procedure for determining whether or not a band required for transmission of the transmission data can be secured based on the detection result of the bandwidth detection procedure and the detection result of the transfer capability detection procedure; If it is determined that the band required for transmission of transmission data cannot be secured,
A first presentation procedure for presenting this determination result, and in order to secure a band required for transmission of the transmission data,
A network connection, comprising: a wiring change decision procedure for creating a topology change plan indicating a change in the topology of the network; and a second presentation procedure for presenting the topology change plan created in the wiring change decision procedure. Optimization method. 7. The wiring change determination step includes creating a plurality of topology change plans for the network, and selecting a topology change plan having the least number of wiring changes connecting each node on the network from the created topology change plans. 7. The network connection optimizing method according to claim 6, wherein the selecting is performed. 8. The network according to claim 1, wherein said network is IEEE 1394.
The wiring change determination procedure is characterized by acquiring node ID and data indicating transfer capability specified in the IEEE 1394 standard, and creating a topology change plan in which nodes are rearranged in order of transfer capability. The network connection optimizing method according to claim 6, wherein 9. The network according to claim 1, wherein said network is IEEE 1394.
The wiring change determination procedure includes the first and second nodes, which are obstacles to securing a band necessary for transmission of the transmission data.
7. The network connection optimizing method according to claim 6, wherein a topology change plan set to a bus ID different from a bus ID of a bus including the node is created.