JPH07273803A - Communication controlling method for isdn terminal equipment and isdn-lan connector - Google Patents

Abstract

PURPOSE:To properly use a communication profile corresponding to the difference of a generated access form and to effectively properly use a line exchange mode and a packet exchange mode by retrieving a destination address and a port number from a table and performing a call setting procedure and a communication procedure by using the communication profile. CONSTITUTION:By using a personal computer 20 of an MS-DOS form, for instance, a table where an ISDN profile to be used for each destination address performing communication and the port number for discriminating the destination address is set is stored. In an ISDN terminal, the destination address and the port number included in the data delivered from the high rank layer of a protocol processing layer for connecting with an ISDN communication network are retrieved from this table at the time of the connection request from an application 28 or a data transmission. A call setting procedure and a communication procedure are performed by using the communication profile selected from the both of an IP address level and a port level.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal device connectable to an ISDN communication network and a communication control method for an ISDN-LAN connection device.

[0002]

2. Description of the Related Art Generally, a terminal device or an IS which has an ISDN user / network interface and can be connected to an ISDN communication network.
In the DN-LAN connection device, the protocol is implemented in a layer (hierarchical) configuration like the model shown in FIG.

In the figure, 1 is a mechanical for activating, maintaining, deactivating a physical connection and transmitting a bit,
A physical layer 2 that performs electrical control transfers data between two adjacent systems, and a data link layer 3 that controls transmission errors controls relaying via a communication network, and a user exists. The network layer 4 for data transfer between systems sets up a general-purpose transport connection between the entities of the session layer 5, and the transport layer 5 for transparent data transfer sets up a connection called a session. , A session layer that controls transmission / reception of data, control of synchronization, and the like, 6 is a presentation layer that inputs, receives, displays, and controls structured data, and 7 executes an application protocol suitable for management and users It is an application layer that enables communication between users.

At this time, the lower layer (data link layer 2
The International Telegraph and Telephone Consultative Committee (CCI) is a protocol for connecting to the ISDN communication network that controls the physical layer 1).
TT) Recommendation I. 430, Q. 921, Q.I. 931 (Japanese Telegraph and Telephone Technical Committee (TTC) standard JT-I430,
JT-Q921, JT-Q931) and the layer specifications shown in TTC standard JT-PD11, JT-PD1.
2, it is known to implement the profiles shown in JT-PD13 and JT-PD14.

Further, in the ISDN-LAN connection device, ISD
It is known that a protocol higher than layer 3 (network layer) of a protocol used as a LAN protocol is implemented in the upper layer of the protocol for connecting to the N communication network.

In the ISDN service, it is possible to use a service of a circuit switching mode (using a B channel for information transfer) and a packet switching mode (using a B channel and a D channel for call control signal) on one interface. It is possible, and which of these services is used is realized by the method of the call control procedure and the communication procedure when the connection is opened.

Now, when performing communication using an ISDN terminal device in which a protocol is implemented with a layer configuration as in the above model, as a simple method, before the upper application opens a connection or transmits data, ,
Using the dialing command (in the case of circuit switching), etc., the ISDN terminal device of the destination and the ISD of the ISDN-LAN connecting device connected to the destination network address
After the call setup is completed for the N number, a method of opening a connection and transmitting data of the upper application is performed.

Further, in the ISDN-LAN connection device, FIG.
The network address registered in the routing table as shown in FIG. 3 and the IS as shown in FIG.
If the network address of the packet to be routed is mapped to a network at a remote location via ISDN by mapping the ISDN number (in the case of circuit switching) registered in the communication environment setting table of DN, As shown in FIG. 2, a method of automatically setting a call at the IP address level and then routing a packet according to the contents of the communication environment setting table of ISDN is also used.

Specifically, when transmitting from LAN to ISDN, the packet received from the network 1 is I
It is sent to the P routing processing unit 2.

The IP routing processing unit 2 processes the received packet according to the contents of the routing table 4. That is, the destination IP address is 133.19.
5.20. If it is X, it is routed to the LAN interface (2), and 133.195.30. X or 133.
195.40. If X, ISDN interface (I
Route to the P / ISDN routing processing unit 6).

The IP / ISDN routing processing unit 6 compares the transmitted packet with the contents of the ISDN communication environment setting table 8, issues a call command of the specified communication profile condition to the ISDN interface, and then sends the packet. Send to ISDN interface.

On the other hand, when receiving from ISDN to LAN, the packet received from ISDN is sent to the IP routing processing unit 2.

The IP routing processing unit 2 processes the received packet according to the contents of the routing table 4. That is, the destination IP address is 133.19.
5.20. If it is X, it is routed to the LAN interface (2), and 133.195.30. X or 133.
195.40. If X, ISDN interface (I
Route to the P / ISDN routing processing unit 6).

[0014]

However, as described above, as the upper layer of the protocol for connecting to the ISDN communication network, the protocol of layer 3 (network layer) or higher of the protocol used as the LAN protocol is mounted. In this method, regardless of the difference in the access form (high / low access frequency, large / small amount of data transfer) occurring in individual inter-process communication or inter-application communication, the network
Since the ISDN communication profile is uniformly assigned only to the addresses, there is a problem that the circuit switching mode and the packet switching mode, which are ISDN services, cannot be used properly.

Further, when communicating with a plurality of processes existing on one network address, regardless of the difference in the access form occurring in the communication between individual processes,
There is also a problem that only one ISDN communication profile can be assigned only by the IP address level.

The present invention has been made to solve the above-mentioned conventional problems, and the ISDN communication profile is set to the IP address level in response to the difference in the access form that occurs in the individual inter-process communication and the inter-application communication. ISD that can be used properly at the port level and can effectively use the circuit switching mode and the packet switching mode
An object of the present invention is to provide a control method for N communication mode.

[0017]

In order to solve the above-mentioned problems, the present invention solves the above-mentioned problems by each destination address (destination network address) for communication and a port number (or socket number) for identifying the destination process. ), A function for storing a table in which the ISDN communication profile to be used is stored, and at the ISDN terminal, when a connection opening request or data is transmitted from an application,
The destination address and port number included in the data passed from the upper layer of the protocol processing layer for connecting to the ISDN communication network are searched from the above table, and the call setting procedure and communication procedure are performed using the communication profile. It is a thing.

In the ISDN-LAN connecting device, the destination address (network address) and the port number included in the packet data routed to the ISDN side by the route setting in the network layer are searched from the table, and the communication is performed. The profile is used to perform a call setup procedure and a communication procedure.

[0019]

In the present invention, each destination address (destination network address) with which communication is performed and the port number (or socket number) for identifying the destination process.
As for the ISDN terminal, the ISDN terminal has a function of storing a table in which the ISDN communication profile is set. The destination address (network address) and port number included in the data to be retrieved can be searched from the above table, and the call setup procedure and communication procedure can be performed using the communication profile selected from both the IP address level and the port level. .

Further, in the ISDN-LAN connecting device, the destination address (network address) and the port number included in the packet data routed to the ISDN side by the route setting in the network layer are searched from the table, and the IP address level is also set. Using the communication profile selected from both the port level and the port level, the call setup procedure and the communication procedure can be performed.

By implementing these means, when communicating with a plurality of processes existing on one network address, it is possible to perform communication by using an arbitrary ISDN communication profile for each interprocess communication. And a common ISD for processes that commonly exist on multiple network addresses on the network.
It is also possible to communicate using the N communication profile.

[0022]

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

FIG. 5 shows an ISDN according to an embodiment of the present invention.
A personal computer 20 of, for example, MS-DOS format, which has an interface and implements TCP (Transmission Control Protocol) / IP (Internet Protocol) as a protocol corresponding to a transport layer / network layer, is shown.

In the figure, a data circuit terminating device (DS
U) 10 provides a function of converting an electric signal transmitted from a subscriber line into an electric signal (for example, a baseband bi-bola signal) defined by a user / network interface, or inversely converting the electric signal.

The ISDN transmission control section 12 is composed of an ISDN interface control section, a D channel control section, and two B channel control sections.
It performs channel transmission control (circuit switching, packet switching) and D channel transmission control.

The ISDN driver 22 built in the personal computer 20 is a software module for controlling the ISDN transmission control unit 12.

Similarly, the LAN protocol stack 26 built in the personal computer 20 is a software module for performing communication control at the network layer and transport layer levels.
TCP and UDP as protocols and transport layers
(User Datagram Protocol) and has a port address that identifies the process (application). Here, the application 28 is an application (process) used on the personal computer 20.

The MAC (medium access control) interface driver 24 built in the personal computer 20 is a software module for implementing the processing according to the present invention, and is based on the data passed from the LAN protocol stack 26. It serves to set a control command for the ISDN driver 22.

FIG. 6 shows the above-mentioned embodiment corresponding to the protocol layer model. Where ISDN3
1 is the ISDN control unit 12 and the ISDN driver 2 of FIG.
2. Corresponds to the MAC interface driver 24.
IP 32 and TCP / UDP 33 correspond to the LAN protocol stack 26 of FIG. Application 3
4 corresponds to the application 28 in FIG.

The processing of the MAC interface driver 24 for implementing the present invention will be described below with reference to FIGS. 7 and 8.

First, a data transmission request is issued from the application 28 (step 102), and the IP address of the destination node and the port number for identifying the destination process (application) are designated by the application 28, and the lower order It is passed to the LAN protocol stack 26 (step 104).

In the LAN protocol stack 26, the destination node stores an ARP (address resolution protocol) table as shown in FIG. 9 for associating an IP address with a physical address (MAC address). Determine if it is registered (step 106),
If not registered, the ARP frame, and if registered, the IP datagram of the format shown in FIG.
Pass to interface driver 24 (step 10)
8, 110).

The MAC interface driver 24 determines whether the passed frame is an ARP frame (step 112). If it is ARP, an ARP pseudo response packet is generated and notified to the LAN protocol stack 26 (step 114). ).

That is, when the line connected like an ISDN terminal is ISDN, the ARP used on the LAN is not normally used. However, in the ISDN terminal used in this embodiment, since the protocol stack of three layers or more used in the node on the LAN (the one with the LAN interface board mounted) is used as it is, the ARP request that is a broadcast is transmitted. , As in the case of the node on the LAN, it is sent to the lower layer as it is. Therefore, in order to avoid this, the MAC interface driver 24 is caused to make a pseudo ARP response.

If it is not an ARP packet, the IP of FIG.
Destination address and TCP in the IP header of the datagram
The destination port in the header is acquired (step 116), and it is confirmed whether it is registered in the ISDN communication environment setting table (outgoing table) shown in FIG. 11 (step 11).
8). If not, discard the frame (step 1
24) Return the transmission error status to the LAN protocol stack 26 (step 130).

On the other hand, if the destination IP address and port number exist, it is confirmed in the communication management table shown in FIG. 12 whether the destination IP address and port number are in communication (step 120). Transmission processing of the IP datagram is performed (step 132). If communication is not in progress, a calling process is performed (step 122). By the calling process, it is judged whether the ISDN line connection is completed (step 126). If the connection fails, the frame is discarded (step 124) and the transmission error status is returned to the LAN protocol stack 26 ( Step 130). When the connection of the ISDN line is completed, the communication profile is registered in the communication management table (step 128), and the IP datagram transmission process is performed (step 132).

Each communication profile on the communication management table shown in FIG. 12 remains set while the communication profile is being communicated, and its entry is cleared at the end of communication.

In the above embodiment, the case where TCP / IP is used as the LAN protocol has been described, but the present invention is not limited to this, and NetWare or A can be used.
It is also effective when other protocols such as ppleTalk are used.

[0039]

According to the present invention, when communicating with a plurality of processes existing on one network address, it becomes possible to perform communication using an arbitrary ISDN communication profile for each interprocess communication. .

Further, it becomes possible to communicate with processes existing in common on a plurality of network addresses on the network by using a common ISDN communication profile.

Therefore, the circuit switching mode, which is an ISDN service, is used in response to the difference in access form (high / low access frequency, large / small data transfer amount) that occurs in individual interprocess communication and interapplication communication. And the packet switching mode can be effectively used properly.

[Brief description of drawings]

FIG. 1 is a diagram showing a protocol implementation model of an ISDN terminal device or an ISDN-LAN connection device.

FIG. 2 is a diagram showing an example of a conventional routing table.

FIG. 3 is a diagram showing an example of a conventional ISDN communication environment setting table.

FIG. 4 is a diagram showing a conventional routing method.

FIG. 5 is a block diagram showing a configuration of a personal computer on which TCP / IP is mounted, which is an embodiment of the present invention.

FIG. 6 is a diagram showing a protocol layer model of an embodiment.

FIG. 7 is a flowchart showing a processing procedure of a MAC interface driver of the embodiment.

FIG. 8 is a flowchart following FIG. 7 showing the processing procedure of the MAC interface driver of the embodiment.

FIG. 9 is a diagram showing an ARP table according to an embodiment.

FIG. 10 is a diagram showing an IP datagram format of the embodiment.

FIG. 11 is a diagram showing an ISDN communication environment setting table according to the embodiment.

FIG. 12 is a diagram showing a communication management table of the embodiment.

[Explanation of symbols]

 10 ... DSU 12 ... ISDN transmission control unit 22 ... ISDN driver 24 ... MAC interface driver 26 ... LAN protocol stack 28, 34 ... Application 31 ... ISDN 32 ... IP 33 ... TCP / UDP

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location H04L 12/02 12/64 29/06 29/08 H04M 3/00 C 9466-5K H04L 11/02 Z 9466-5K 11/20 A 9371-5K 13/00 305 C 9371-5K 307 Z

Claims (2)

[Claims] 1. An ISDN terminal device having a protocol stack for performing data communication processing such as interprocess communication and application communication on an ISDN user / network interface protocol, and identifies individual destination addresses and processes. For the port number (socket number) for this purpose, it has a function to store a table in which the communication profile to be used is set, and when the application opens a connection request or sends data, the destination address and port number are searched from the above table, A communication control method for an ISDN terminal device, comprising performing a call control procedure using a communication profile. 2. ISDN user network interface and LA
The ISDN-LAN connection device equipped with the N interface has a function of storing a table in which a communication profile to be used is set for each destination address (network address) and port number (socket number). From the LAN side to the ISDN side Control of the ISDN-LAN connection device, characterized in that, when the route of the packet to which the route is set is searched, its destination address and port number are searched from the above table and the call control procedure is performed using the communication profile. Method.