JP3597049B2 - Route-selection type communication device in integrated network - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a path selection type communication apparatus that accommodates clients (hereinafter, CLIs) of various terminals and can select a connection path of a transmission path based on routing information, LCR information, and the like.
[0002]
[Prior art]
Conventionally, as this kind of technology, there is Japanese Patent Application Laid-Open No. 6-350651 as a technology for integrally handling packet signals, frame relay signals and ATM cells.
[0003]
In this publication, an ATM fixed-length cell interface unit for receiving an ATM fixed-length cell for which a path is selected using VPI / VCI, and a variable for receiving a variable-length frame signal and adding VPI / VCI as cell header information to the variable-length frame signal A hybrid communication processing device including a long frame interface unit and a communication processing unit that performs communication processing based on VPI / VCI is described. The variable-length frame interface unit adds VPI / VCI to the variable-length frame signal, and the communication processing unit performs communication processing on both the ATM fixed-length cell and the variable-length frame signal based on the VPI / VCI.
[0004]
In brief, this publication has an ATM fixed-length cell interface unit and a variable-length frame interface. In a hybrid communication processing device, a common ATM cell header is added to non-ATM interface data (basic format). Are simplified), thereby simplifying the function of the communication processing unit.
[0005]
Specifically, the ATM fixed-length cell interface unit has a function of performing a synchronization process and a header conversion process on the ATM fixed-length cell in the cell termination circuit, and then transmitting the result to the communication processing unit. At that time, a port address is further added to the header of the ATM cell.
[0006]
The port address is an address number for recognizing each interface unit, and the information is given by the control unit.
[0007]
On the other hand, the variable-length frame interface unit terminates the frame signal, adds an ATM cell header and a port address, and sends the same to the communication processing unit.
[0008]
The communication processing unit has a routing control function of the ATM header, and the cells transmitted to each interface unit are notified to other interface units by broadcast.
[0009]
When each interface receives the cell, only the cell that has been filtered in advance by the address filtering unit provided in the interface unit is input into the interface.
[0010]
The interface circuit performs a header process on cells received from the bus. In the fixed-length cell interface unit, the header is removed using a VPI / VCI removal circuit, and the frame is transmitted to the line by a frame transmission circuit.
[0011]
Further, it has a fixed-length cell priority function as another function. This function is controlled by the control unit, and when each interface unit transmits a cell to the bus, the fixed-length cell can be preferentially transmitted to the bus.
[0012]
Further, it has a cell / frame conversion trunk unit used when data is exchanged between the fixed-length cell interface unit and the variable-length cell interface unit, and converts fixed-length cells into variable-length frames or vice versa. Is going.
[0013]
[Problems to be solved by the invention]
As described above, according to the hybrid communication processing apparatus, the function of converting between fixed-length cells and variable-length frames is provided, so that unified management can be performed regardless of the cell length.
[0014]
However, since fixed-length cells and variable-length cells are processed by the same communication processing unit, in this conventional technique, when a huge amount of burst data other than voice cells is mixed in a line allocated for voice cell transmission, A delay occurs in cell transmission, and it becomes difficult for the receiving side to maintain continuity of audio data required for reproduction. Further, when voice data is converted into ATM cells, overhead is inevitably added, so that it is not always possible to efficiently transfer data at high speed via an ATM network.
[0015]
Furthermore, since there is no control function for managing traffic and the like of various networks, even if various network interfaces (hereinafter referred to as NTINF) are connected, there is no specificity in a path setting selection method.
[0016]
In other words, in this conventional technology, various interfaces can be accommodated and mutual entry between the various interfaces can be performed, but since input signals are not distributed in consideration of data characteristics, network resources and switch resources are efficiently used. Can not do it.
[0017]
Considering the characteristics of various networks again, the ATM network can handle voice, images, LAN data, etc. in multimedia-compatible data in a unified manner, and has the advantage of providing network resources in response to client requests. In addition, it has a function to guarantee. However, since various data are divided into fixed-length data, the overhead is increased by the amount of the header. In particular, in the case of voice, when a plurality of networks are connected, delay or fluctuation may occur and voice quality may be degraded.
[0018]
In a packet network, the larger the capacity, the more suitable for large-capacity data transfer. However, when voice or the like is passed when burst traffic is high, there is a problem that the quality of voice and image data is deteriorated.
[0019]
The ISDN network is optimal for transferring voice and image data, but is not suitable for transferring large-capacity data such as packet data.
[0020]
Therefore, an object of the present invention is to enable various interfaces to be entered, and to minimize data delays at the time of network switching, from the main viewpoint of maximizing the effective use of network resources and switch resources. An object of the present invention is to provide a route selection device that can be suppressed.
[0021]
[Means for Solving the Problems]
Therefore, in the present invention, in a route selection type device in which various networks enter each other, the data is real-time data requiring real-time properties such as voice, or non-real-time data such as LAN which allows delay. And distinguishing the network according to the type of media.
[0022]
That is, according to the present invention, in a communication device connected to an ATM network, a frame relay network, and an ISDN network, a media type of data (hereinafter, referred to as client data) transmitted from a client corresponding to each network is called. A distribution control unit that identifies the client data based on the request and determines a destination according to the media type, and the distribution control unit detects a traffic state of a network requested to be connected, and as a result, it is confirmed that there is no congestion. In this case, path setting information is determined by negotiation with an opposite station connected to the network, and a network management unit for notifying the path setting information to the distribution control unit; A cell switch for interconnecting clients, a packet switch for interconnecting a frame relay network and clients corresponding to the network, A TDM switch for interconnecting an SDN network and a client corresponding to the network, and mutually converting ATM cells and packet data when the path setting information indicates a path setting between a client corresponding to the ATM network and a frame relay network. A cell / packet conversion circuit for converting between ATM cells and TDM data when the path setting information indicates a path setting between a client corresponding to an ATM network and an ISDN network; And a packet / TDM conversion circuit that converts packet data and TDM data between each other when the setting information of the client indicates the path setting of the ISDN network and the client corresponding to the frame relay network. And a distribution unit for performing a path connection based on the path selection type communication. It can be obtained device.
[0023]
Furthermore, as a result of the media identification by the distribution control unit, if the data requires real-time properties such as voice, the transmission destination of the client data is determined to the ATM network, and a non-delay such as LAN is allowed. If the data is real-time data, it is determined to be an ISDN network, and a path selection type communication device that can effectively utilize network resources can be obtained by setting a path. .
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0025]
FIG. 1 shows a network system which incorporates a route-selection type communication device to which the present invention is applied in various networks and is capable of switching between networks.
[0026]
In the route selection type communication device 1, an ATM client interface (hereinafter, referred to as ATM-CLIINF) 10, a packet client interface (hereinafter, referred to as packet-client interface) 11, and an ISDN client interface (hereinafter, ISDN) for accommodating various clients. -CLINF) 12, a distribution unit 30, a distribution control unit 31, a network management unit (hereinafter referred to as an NT management unit) 40 for performing communication control with the opposite station, and an interface between various networks. ATM network interface (hereinafter, referred to as ATM-NTINF) 50, packet network interface (hereinafter, referred to as packet-NTINF) 51, ISDN network interface (hereinafter, ISDN-NTI) Constituted by an F hereinafter) 52.
[0027]
First, the types of clients that can be accommodated by the route selection type communication device 1 include a personal computer and a TEL image terminal, and a LAN terminal having a LAN access method for which standardization is being deliberated by each ANSI association, and a THE terminal. There are an ATM terminal having an access method conforming to the ATM-Forum, and an ISDN terminal conforming to the ITU-T.
[0028]
Here, the feature of the route selection type communication apparatus 1 to which the present invention is applied is that, first, a call request transmitted from various clients is received by CLINF, and the distribution control unit 31 transmits the data transmitted by the client. After identifying the media, the media is transmitted to a high-priority network in accordance with the priority in consideration of the media characteristics. FIG. 2 shows the flowchart. Here, after confirming network congestion, the destination network is determined.
[0029]
Furthermore, in order to distribute the data transmitted by the client more efficiently, a network optimal for routing is defined in accordance with the type of media, and the distribution control unit 31 checks the protocol of the data requested to be called and performs It is configured to identify media, determine dynamic routing information containing path setting information and the like for transmission to an optimal network, and control the conversion operation and the like of each circuit included in the path selection type communication device 1. .
[0030]
In determining the dynamic routing information, the priority of the destination network according to the media was derived as shown in FIG. 3 in consideration of the type of the media and the characteristics of the network.
[0031]
According to this, with respect to an ATM client, when a voice cell is input, the ISDN network is given first priority, and the ATM network is given second priority. If other data such as images is input, the ATM network is given first priority, and the frame relay network is given second priority.
[0032]
Regarding the packet client, when a voice packet is input, the ISDN network is given first priority, and the ATM network is given second priority. When an image packet is input, the ATM network is given first priority, and the frame relay network is given second priority. For other data, the frame relay network is given first priority, and the ATM network is given second priority.
[0033]
With regard to the ISDN client, when voice is input, the ISDN network is given first priority and the ATM network is given second priority. If other data such as images is input, the ATM network is given first priority, and the frame relay network is given second priority.
[0034]
However, these priorities can be changed according to the traffic total result of the network management unit 40 described later, and the characteristics of the various NTINFs possessed can be used efficiently.
[0035]
In addition, these settings can be changed in various ways. For example, only one NT-INF can be used, the time can be changed dynamically according to a time zone or occurrence of a failure, and the system configuration can be flexibly changed. It is also possible to respond.
[0036]
First, the distribution control unit 31 identifies the attribute (media such as voice or non-voice) of the data output by the client and optimizes the priority according to the above-described priority and the media identification and the constantly changing network traffic situation. The routing is determined and used as dynamic routing information.
[0037]
In the case of media identification, in the case of data from an ATM terminal, voice data or VC (Virtual Channel) units are generally used according to a procedure based on signaling control (such as ATM-Forum UNI 3.0 or 3.1). Image data and other packet data are identified. In the case of data from an ISDN terminal, similarly to ATM, it is determined whether the data is audio data, image data, or other data based on ISDN signaling (such as ITU-T Q.931). . The packet terminal basically handles packet data conforming to the TCP / IP protocol and the like in a unified manner, and thus identifies the packet data by a logical connection.
[0038]
The NT management unit 40 detects the traffic state of various networks based on the request of the distribution control unit 31, and has a management function necessary for connecting a relay path to an opposite station of the other network. As a specific example of the traffic monitoring method, there is a method in which the number of cells and the number of packets generated per unit time are totaled, and if the number is higher than a predetermined value, traffic over is performed.
[0039]
When a plurality of devices of the present invention exist on the network, control information is shared between the NT management units 40. For example, the audio data indicates which path is transmitted by which header information. One example of this control method is the ITU-T NO7 signaling system.
[0040]
Next, the configuration and function of each CLINF will be described with reference to FIG.
[0041]
FIG. 4A is a block diagram of the ATM-CLINF 10. When data is received from the client, the ATM layer termination circuit 10a checks the ATM cell for errors and synchronizes the data. The header conversion unit 10b converts the ATM cell header according to the dynamic routing information received via the ATM control interface 10c, and outputs the result to the distribution unit 30. When transmitting an ATM cell to the distribution unit 30, a bus acquisition request must be transmitted to the distribution unit 30, and a bus use right must be acquired from the switch control unit 27.
[0042]
When data is received from the distribution unit 30, only ATM cells having a predetermined header are filtered and taken in, the header is changed based on the conversion information, and then sent to the client.
[0043]
FIG. 4B shows a block diagram of the packet-CLINF11.
[0044]
After the packet data transmitted by the client B is terminated by the packet-L1 termination circuit 11a, the variable-length data is converted to fixed-length data having a fixed length, and is transmitted to 110 with packet header information added. You. On the other hand, with respect to data received from the opposite station of the network, only a packet having a packet header having a predetermined packet header is filtered and taken in, the packet header is deleted, and transmitted to the client.
[0045]
FIG. 4C shows a block diagram of the ISDN-CLINF12.
[0046]
The data sent from the client C is terminated in an ISDN-L1 terminating circuit 12a terminating the physical layer of the ISDN, and the time slot conversion circuit 12b for changing the time slot of the terminated ISDN data is transmitted to the TDM switch 23. When transmitting ISDN data, it is transmitted in predetermined 120 time slots. When data is received from the TDM switch 23 through the switch 120, only data in a predetermined time slot is fetched.
[0047]
Next, the configuration and operation of the distribution unit 30 will be described with reference to FIG.
[0048]
The distribution unit 30 includes switches 21 to 23 corresponding to each network, various data conversion units 24 to 26 for enabling mutual entry between the networks, and a switch control circuit 27 for controlling the entire distribution unit. In accordance with the dynamic routing information received from the distribution control unit 31, the received data is converted if necessary, and then switches 21 to 23 are switched to execute path connection between various clients and various networks.
[0049]
The data distribution method includes a dynamic distribution method for distributing data based on data attributes and a traffic state on the network side, and a fixed distribution method fixed in advance.
[0050]
When connecting the paths, the paths are connected by switching the switches 21 to 23 based on the dynamic routing information held by the distribution control unit 31.
[0051]
That is, in each of the switches 21 to 23, the received data is output to the determined route under the collation with the dynamic routing information. However, the contents of the dynamic routing information execute the path connection between networks of the same type. In such a case, the received data is directly output to NTINF or CLINF via a bus (not shown) in the switch. On the other hand, when the dynamic routing information indicates a path connection between heterogeneous networks, the data is converted by the corresponding conversion units 24 to 26 and then output to NTINF or CLINF by switching between switches.
[0052]
Next, with reference to FIG. 6, various data converters that can connect to different types of networks will be described.
[0053]
FIG. 6A is a block diagram of the cell / packet converter 24. The cell / packet converter 24a converts ATM cells to packet data, and the packet / cell converter 24b converts packet data to ATM cells. , And a cell / packet control interface 24c for controlling the conversion process.
[0054]
When packetizing ATM cells or packetizing packet data, dynamic routing information is previously given to the cell / packet control interface unit 24c from the distribution control unit 31, and interface conversion is performed based on the dynamic routing information. Done.
[0055]
Upon receiving the ATM cell from the signal line 240, the cell / packet conversion circuit 24a searches the header information for the packet corresponding to the header information of the detected ATM cell from the dynamic routing information, adds the header information, and generates the packet information. The packet signal is transmitted to the signal line 241.
[0056]
When converting a packet into a cell, the packet / cell conversion unit 24b converts the packet into an ATM cell and transmits the ATM cell to the signal line 240 by the reverse procedure.
[0057]
FIG. 6B is a block diagram of the cell / TDM conversion unit 25. The cell / TDM conversion circuit 25a converts a cell into a TDM, the TDM / cell conversion circuit 25b converts a TDM into a cell, and a cell / TDM control interface. According to the dynamic routing information received from the distribution control unit 31 via the cell / packet control interface 25c, the interface conversion is performed by converting the ATM cell into TDM or the reverse conversion.
[0058]
Specifically, when receiving the ATM cell from the signal line 250, the cell / TDM conversion circuit 25a checks the header of the ATM cell included in the dynamic routing information, deletes unnecessary data such as the ATM header, and sets the time. The data of the payload portion is inserted at the slot position and transmitted to the signal line 251.
[0059]
On the other hand, when converting TDM data into cells, the data is converted by the TDM / cell conversion circuit 25b in the reverse procedure. The converted ATM cell is transmitted to signal line 250.
[0060]
FIG. 6C shows a packet / TDM conversion unit 26, which is composed of a packet / TDM conversion circuit 26a, a TDM / packet conversion circuit 26b, and a packet / TDM control interface 26c. In accordance with the dynamic routing information received via the / TDM control interface 26c, the packet data is converted into TDM or the reverse conversion is performed to perform the interface conversion.
[0061]
Specifically, upon receiving the packet data from the signal line 260, the packet / TDM conversion circuit 26a searches for time slot information corresponding to the header information of the detected packet from the dynamic routing information, and extracts unnecessary information such as the header. After the deletion, only the actual data is inserted into the corresponding time slot position and transmitted to the signal line 261.
[0062]
On the other hand, when converting TDM into a packet, the TDM / packet conversion circuit 26b converts the TDM data into a packet by adding a packet header to the data at the corresponding time slot position, and sends the packet data to the signal line 260. I do.
[0063]
Next, the operation will be described with reference to the circuit block diagrams of various NTINFs shown in FIG. 7. NTINF and CLINF have the same basic function as an interface, and the difference is that the traffic that detects the traffic state of each network is different. It has a monitoring circuit. That is, the traffic state detected by the traffic monitoring circuit is sent to the NT management unit 40 and becomes a determinant of the dynamic routing information.
[0064]
Next, the routing of data transmitted from each client will be described with reference to the flowcharts shown in FIGS.
[0065]
First, a network routing according to a call request and a media type from each client will be described with reference to FIG.
[0066]
When the data is transmitted from the ATM client and the media type is recognized, if the data is audio data, control is performed so as to route the packet to the ISDN network (process A). If the data is other than voice data, the data is transmitted to the ATM network. Control is performed for routing (move to process B). When the packet is sent from the ISDN client, the same routing as the ATM client is attempted.
[0067]
When the packet is transmitted from the packet client and the media type is recognized, as a result of voice recognition, control is performed so as to route the packet to the ISDN network (proceed to processing A), and in the case of image data, the packet is routed to the ATM network. Control is performed (move to processing B), and routing of the other data to the frame relay network is attempted (move to processing F). Here, N is defined in the flowchart, but is used when the first priority is congested and the process shifts to the routing confirmation to the network having the second priority. In each flowchart, N being 2 indicates a situation in which it is determined that congestion is occurring as a result of routing confirmation to the network having the second priority, and client data is not permitted to be sent to the network.
[0068]
Next, a case where the routing destination is an ATM network will be described with reference to FIG. The distribution control unit 31 requests the NT management unit 40 to check the traffic state of the ATM network.
[0069]
As a result, when confirmation of no congestion is obtained according to the lower priority, the NT management unit 40 permits the use of the ATM network, negotiates with the opposite station of the network, and determines the VC value to be used on the network, It is sent to the distribution control unit 31 as routing information. In the case of congestion, N is incremented by 1 and the processing shifts to processing D.
[0070]
Next, a case where the routing destination shown in FIG. 10 is a frame relay network will be described.
[0071]
The NT management unit 40 arbitrates the use permission of the frame relay line with the opposite station of the network. At that time, when the traffic of the frame relay network is confirmed and the confirmation of no congestion is obtained, the NT management unit 40 allows the distribution control unit 31 to transmit the network and transmits packet header information used by the distribution unit 30. hand over.
[0072]
The distribution control unit 31 issues a transfer instruction to each CLINF, and the data transmitted in response thereto is converted to a packet and then transmitted to the network.
[0073]
Next, a case where the routing destination is the ISDN network will be described with reference to FIG.
[0074]
The NT management unit 40 arbitrates the use permission of the ISDN line with the opposite station of the network. At this time, when the traffic of the ISDN network is confirmed and the confirmation of no congestion is obtained, the NT management unit 40 allows the distribution control unit 31 to transmit the network and transmits the time slot position information used by the distribution unit 30. hand over.
[0075]
The distribution control unit 31 issues a transfer instruction to each CLINF, and the data transmitted in response thereto is converted to a packet and then transmitted to the network.
[0076]
Next, a case will be described with reference to FIG. 12 in which the first-priority network attempts to transmit the second-priority network due to congestion.
[0077]
First, the value of N is checked, and in the case of N, it is determined that the traffic of all networks is congested, and the NT management unit 40 sends a connection refusal to the client.
[0078]
If N is 2 and the input is from the packet CLINF, an attempt is made to send the packet to the ATM network shown in process B. If the data is from another client, the frame shown in process F Attempt to send to relay network.
[0079]
Next, FIG. 13 shows a specific example of dynamic routing information of data transmitted from various clients, and the operation of each unit will be described using this. It should be noted that "ON" in the drawing means that the circuit operation is turned on, and "OFF" means stop.
[0080]
FIG. 13A shows that two ATM cell paths are provided. A cell with an ATM header number 1/30 (this symbol indicates VP = 1 and VC = 30) input from the ATM client is converted into an ATM cell header 2/25 by the ATM-CLINF 10 and transmitted. Since the cell / packet converter 24 is ON, the cells of the ATM cell header 2/25 pass through the cell / packet converter 24. Then, the packet of the packet header information AA header subjected to the packet encapsulation processing in the cell / packet conversion unit 24 is transmitted to the packet network via the packet-NTINF50.
[0081]
The cell with the other ATM header number 1/35 is converted into an ATM cell header 3/25 by the ATM-CLINF 10 and transmitted. Since the cell / TDM converter 25 is ON, the cells of the ATM cell header 3/25 pass through the cell / TDM converter 25. Then, the TDM data in the time slot 10 of the TDM switch 23 which has been converted into TDM data in the cell / TDM conversion unit 25 and set in advance is transmitted to the ISDN-NT via the ISDN-NTINF 52.
[0082]
Next, FIG. 13B shows that two packet paths are set up. The packet of the packet logical header number 10 input from the packet client is added to the header of the header 50 on the packet switch 22 side by the packet-CLINF 11 to be encapsulated and transmitted. Since the cell / packet converter 24 is ON, the packet of the header 50 passes through the cell / packet converter 24. Then, the cell / packet converter 24 converts the cell into an ATM cell and adds cell header information 10/20. Furthermore, since the network side setting is ATM / network function ON, the ATM / network function is transmitted to the ATM network via the ATM-NTINF 50 of the 10/20 header.
[0083]
The packet of the other packet logical header number 20 is added to the packet switch 22 header 60 in the packet-CLINF 11 and is encapsulated and transmitted. Also, since the packet / TDM converter 26 is ON, the packet of the packet header 60 passes through the packet / TDM converter 26. Then, the data is converted into TDM data by the packet / TDM conversion unit 26 and transmitted to the preset time slot 30 of the TDM switch 23. Further, since the network setting is ISDN "ON", the TDM data of the time slot 30 is transmitted to the ISDN network via the ISDN-NTINF 52.
[0084]
Next, FIG. 13C shows that two ISDN paths are set up. The ISDN data of the line number 1 input from the ISDN client is sent to the preset time slot 5 on the TDM switch 23 side by the ISDN-CLINF 12. Also, since the packet / TDM conversion unit 26 is ON, the TDM data in the time slot 5 passes through the packet / TDM conversion unit 26. Then, the packet / TDM conversion unit 26 performs encapsulation, adds a packet header BB, and sends the packet to the packet switch 22. Further, since the packet on the network side is "ON", the packet of the packet header BB is transmitted to the frame relay network via the packet-NTINF 51.
[0085]
The ISDN data of the line number 2 is transmitted to a preset time slot 6 of the TDM switch 23 in the ISDN-CLINF 12. Also, since the cell / TDM conversion unit 25 is ON, the TDM data of the time slot 6 passes through the cell / TDM conversion unit 25. Then, the cell / TDM conversion unit 25 adds the cell header 6/10 to the cell and converts it into an ATM cell. Further, since the network setting is ON, the ATM cell of the cell 6/10 is transmitted to the ATM network via the ATM-NTINF50.
[0086]
【The invention's effect】
According to the present invention, the data transmitted from the client is distributed according to the type of the media, so that network resources can be effectively used, and the network is connected in consideration of the type of the media and the characteristics of the network. Thus, network resources can be used more efficiently.
[0087]
In addition, a switch corresponding to various networks and a data conversion circuit that enables mutual entry between networks are provided, and switching between switches is controlled according to dynamic routing information according to traffic conditions, so that data delay does not occur. Data continuity can be easily maintained.
[Brief description of the drawings]
FIG. 1 is a network system incorporating a route selection type communication device to which the present invention is applied.
FIG. 2 is a flowchart showing data distribution according to the type of media.
FIG. 3 shows an example of priorities of dynamic routing information.
FIG. 4 is a block diagram of various client interfaces 10 to 11;
FIG. 5 is a block diagram of a distribution control unit 31;
FIG. 6 is a block diagram of various conversion units 24 to 26 included in the distribution control unit 31.
FIG. 7 is a block diagram of various network interfaces 50 to 52.
FIG. 8 is a flowchart showing a procedure for identifying a media type based on a call request from a client.
FIG. 9 is a flowchart when a routing destination is an ATM network.
FIG. 10 is a flowchart when a routing destination is a frame relay network.
FIG. 11 is a flowchart when a routing destination is an ISDN network.
FIG. 12 is a flowchart in the case where a network with a second priority is attempted because a network with a hemorrhoid A1 priority is congested;
FIG. 13 is a specific example of dynamic routing information.
[Explanation of symbols]
1 route selection type communication device
10 ATM-CLINF
10a ATM termination circuit
10b ATM header conversion circuit
10c ATM control interface
11 Packet-CLINF
11a Packet L1 termination circuit
11b Packet / capsule conversion circuit
11c Packet control interface
12 ISDN-CLINF
12a ISDNL1 termination circuit
12b time slot conversion circuit
12c ISDN control interface
30 Distributor
31 Distribution control unit
40 NT Management Department
50 ATM-NTINF
50a ATM header conversion circuit
50b ATM termination circuit
50c ATM control interface circuit
50d ATM traffic monitoring circuit
51 packets-NTINF
51a Packet / capsule conversion circuit
51b Packet L1 termination circuit
51c Packet control interface
51d packet traffic monitoring circuit
52 ISDN-NTINF
52a time slot conversion circuit
52b ISDN termination circuit
52c ISDN control interface
52d ISDN traffic monitoring circuit
21 cell switch
22 Packet Switch
23 TDM switch
24 cell / packet converter
24a cell / packet conversion circuit
24b packet / cell conversion circuit
24c cell / packet control interface
25 cell / TDM converter
25a cell / TDM conversion circuit
25b TDM / cell conversion circuit
25c cell / TDM control interface
26 packet / TDM converter
26a Packet / TDM conversion circuit
26b TDM / packet conversion circuit
26c packet / TDM control interface
27 SW control circuit

Claims (1)

In a path selection communication device connected to an ATM network, a frame relay network, and an ISDN network, a media type of data (hereinafter, referred to as client data) transmitted from a client corresponding to each network is determined based on a call request. A distribution control unit that identifies and determines the destination of the client data according to the media type, and detects the traffic state of the network to which the connection control unit requests a connection. A network management unit that determines path setting information by negotiation with an opposite station connected to the network, and notifies the distribution control unit of the path setting information, and interconnects an ATM network with a client corresponding to the network. A cell switch, a frame relay network, and a packet switch interconnecting a client corresponding to the network, an ISDN network, and a A TDM switch for interconnecting corresponding clients, and a cell / packet conversion circuit for converting between ATM cells and packet data when the path setting information indicates a path setting between a client corresponding to an ATM network and a frame relay network. When the path setting information indicates a path setting between the client corresponding to the ATM network and the ISDN network, a cell / TDM conversion circuit for mutually converting ATM cells and TDM data, and the path setting information corresponds to a frame relay network. And a packet / TDM conversion circuit for converting packet data and TDM data between each other when indicating path setting of the ISDN network, and distributing the client data based on the path setting information. And a path selecting type communication device.

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