JP2000295215A - Method for connecting communication terminal to internet, adaptation device, network node and switchboard - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an optimized access by connecting communication terminal data to data transmitted or received by means of another kind of communication apparatus, executing transmission between a switchboard and an adaptation device, converting connected data into a second protocol which can be analyzed by means of at least one first Internet access device, executing reverse conversion and transmitting it. SOLUTION: Terminals T1 and T2 are connected to the switchboard SW1 with an ISDN subscriber line. The terminals T3 and T4 are respectively connected to the switchboard SW2 with the ISDN subscriber lines BDT3 and BDT4. The terminal T1 transmits an address-designated data packet to Internet with a channel DT1 and the switchboard SW1. As a result, the switchboard SW1 inserts the data packet to existing connection to the adaptation device AD or sets design possible D-channel connection as virtual D-channel connection between the terminal T1 and the adaptation device AD.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The invention relates to a method according to the preamble of claim 1, an adaptation device for this method according to the preamble of claim 9, and an adaptation device for this method according to the preamble of claim 13. A network node and a switching center for this method according to the preamble of claim 14.

[0002]

BACKGROUND OF THE INVENTION A typical terminal subscriber, at his terminal, usually a personal computer, mainly uses a modem or adapter for this purpose when establishing an online connection to a data network, especially the Internet. The personal computer is connected to a subscriber line of a public telephone network, which is an integrated service digital network (ISDN) in the present variant on which the present invention is based. The subscriber then dials the directory number of the Internet Service Provider (ISP) dial-in server on the personal computer, thereby:
The public telephone network establishes an online connection between a personal computer and a dial-in server, and thus the Internet. An online connection is established by a switched connection and a communication network on an ISDN subscriber line via a so-called B-channel that exclusively provides a certain bandwidth suitable for voice transmission. With the above method, the subscriber can only receive data from and send data to the Internet when pre-establishing such a switched online connection. However, many Internet applications on personal computers maintain a continuous connection to the Internet without tedious call setup and disconnection, while at the same time being much narrower than voice transmission over a wide time slot. It is intended to require bandwidth. Ideally fixed (permanent)
Internet applications with low bit rate Internet connections are, for example, sending and receiving e-mails or updating data already stored at the subscriber terminal, such as price lists, timetables, aircraft arrival times, and the like.

[0003]

Therefore, in the proposed solution of this problem, a fixed Internet connection is realized via the D channel of the ISDN subscriber line. In this case, the ISDN received on the D channel
The message is X. It is converted into a message for 25 networks. Then, X. 25 message is an X.25 message. 25
The data is transferred to the Internet service provider (ISP) via the network. This method is the same in the reverse direction. Thus, a semi-persistent online connection is reliably established, but X. It is necessary to include 25 networks. X. The 25.25 network is subject to the additional load of semi-permanent online connections, and furthermore to X.25 Complex routing of 25 messages must be provided. X. The pricing of such services over 25 networks has in fact proved to be very difficult. Furthermore, all suppliers of ISDN communication networks are subject to X.400. 25 network or X.25. It does not have a connection to 25 networks.

X. Such use of the 25 network is a requirement of the VIA (Venders ISD) established in the United States.
N Association). There, X. By including 25 networks,
A fixed connection designed as "Always ON (AO)" is established between the ISDN terminal and the Internet via a D-channel and, if necessary, one or more B-channels are called "Dynamic IS".
A dynamic connection is established with the "DN (DI)" function. Therefore, the whole concept is AODI (Alwa
ys On Dynamic ISDN).
VIA-compliant AODI is also described in X.264. Twenty-five networks are required, and the disadvantages are as described above. In addition, the VIA-compliant AODI system set has non-negligible drawbacks. According to the VIA, a so-called network access server (NAS) is an "Alway
X for connecting the D channel of "sON". Terminate both the 25 network and the channel connected to the NAS via the B channel or ISDN communication network. NAS for dynamically connecting and disconnecting B channels
Has various X. 25 and via the connectivity of the ISDN network. According to the VIA, previously used NAS was not suitable for AODI and would have to be expensively modified or even replaced with a new NAS designed for VIA compliant AODI.

[0005] It is therefore an object of the present invention to create an optimized, fixedly maintainable access to the Internet for the subscriber lines of an ISDN communication network.

[0006]

This object is achieved by a method according to the technical teaching of claim 1, an adaptation device according to the technical teaching of claim 9, and a network node according to the technical teaching of claim 13. , And a switching center according to the technical teachings of claim 14. Other advantageous effects of the invention will become apparent from the dependent claims and the following description.

[0007] The present invention relates to a communication terminal, particularly a personal computer or an Internet-compatible telephone.
N (Integrated Services Digital Network) communication network, in each case, for each subscriber line used,
It is based on the concept of providing semi-permanent access to the Internet via a separate channel, in particular the D channel. The terminal has a D-channel, in this case, an X.400 standard that normally conforms to ITU (International Telecommunication Union) recommendations. Data is transmitted and received on the OSI layer 3 D channel of 25 format. "Frame Handler (f
A multiplexer / demultiplexer, also referred to as a "frame handler", allows the switching center of the ISDN communication network to bundle the data of each of the plurality of D channels and to combine the bundled data with the collective channels of the ISDN communication network, preferably, The signal is transmitted to the adaptation device on the Bd channel having the capacity of the B channel. Then, the adaptation device is connected to an Internet access device, for example, an access server or a network access server (NA).
Convert the data into a format that can be interpreted by S) and send this data to the Internet access device. The reverse path between the Internet access device, the adaptation device, and the switching center works in a similar manner. Therefore, X. No 25 networks are required.
The aggregation channel can be fixedly established between the exchange and the adaptation device, or can be established as required.
Further, in the case of transmission on the aggregate channel, in practice,
The 25 protocols can be omitted. In this case, the data is directly transmitted, for example, by the point-to-point protocol (Internet) of the ISDN layer 2 protocol.
EngineeringTask Force = IE
(Defined by TF), thus significantly improving the useful data throughput.

In a development of the invention, for example, in each case, further data lines can be used between the terminal and the adaptation device, and thus between the terminal and the Internet. In fact, if the capacity of the D-channel is exceeded, one or more additional channels between each terminal and the adaptation device can be set up by the terminal or the adaptation device. In this case, for example, one or two B channels are switched to the D channel, or the switching from the D channel to the B channel is performed, and the transmission on the D channel is interrupted. As soon as the transmission capacity of the D-channel becomes appropriate again, only the D-channel is used. The B channel resources of the ISDN communication network are only loaded when required for the required transmission capacity. In this case, if the adaptation device processes the data traffic via the D channel and the dynamically connected and disconnected B channel, the already used Internet access device, especially the network access server (NAS), is expensive. Can be used continuously without major upgrades or modifications. The adaptation device can in fact be connected directly to a broadband access computer provided for access to the Internet, for example, from an ADSL (asynchronous digital subscriber line) subscriber.

To further conserve ISDN communication network resources, the bundled D-channels can be routed, at least in sections, to a connection of a transmission network, for example a frame relay network.

In an advantageous variant of the invention, the switching center of the ISDN communication network, preferably the switching center to which the terminal coupled to the Internet according to the invention is connected, comprises:
Determine the charges that you incur for connecting your terminal to the Internet. To this end, the exchange determines the amount of data transmitted on the D channel between the terminal and the Internet and the service life of one or more B channels between the terminal and the Internet.

[0011] The invention and its advantages are illustrated below using an exemplary embodiment with reference to the drawings.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS This figure shows terminals T1, T2, T3.
And T4, a switching center SW1 according to the invention, an adaptation device AD according to the invention, and an arrangement for implementing the method according to the invention with Internet access devices ACC1 and ACC2.

FIG. 1 shows a configuration example for realizing the present invention. This figure shows an ISDN communication network I with a switching center SW1, a switching center SW2 and a switching center TRANS.
Indicates SDNW. These example exchanges represent other equipment, not shown, of the ISDN communication network ISDNW, such as other exchanges, network management systems and transmission equipment. In the illustrated example, the exchanges SW1 and SW2 are local exchanges, and the exchange TRANS is a transit exchange connected to the adaptation device AD. In the access device ACC1 or the access device ACC2,
It has arrived by the adaptation device AD via the ISDN communication network ISDNW. Also, via the adaptation device AD, the data of the access device is:
It can be transmitted from the ISDN communication network ISDNW to the Internet, and can be received from the Internet by the ISDN communication network ISDNW. The adaptation device AD sends an ISDN communication network ISDNW for transmission to the access device ACC1 or ACC2.
, And vice versa. The adaptation device AD is, for example, a server further comprising modules, for example one or more processors, storage means, and input and output media, in addition to the elements shown in the figures and detailed below. Access device A
CC1 and ACC2 are ISDN communication networks I
An Internet service provider (IS) that provides access to the Internet for SDNW terminal subscribers
P) is a dial-in server.

The terminals T1 and T2 are connected to the exchange SW1 via an ISDN subscriber line. Of these subscriber lines, channel DT1 and channel BT1 are shown as examples of terminal T1, and channel DT2 and channel BT2 are shown as examples of terminal T2. Channels DT1 and DT2 are D channels and channel BT
1 and BT2 represent one or more B-channels of a basic connection or a primary multiple access. Terminal T3 and terminal T4 are respectively
SDN subscriber line BDT3 and ISDN subscriber line BDT
4 is connected to the exchange SW2. Terminal T1, T
2, T3 and T4 are terminals capable of accessing the Internet. Therefore, the terminals T1, T2, T3
And T4 are, for example, interface cards, in particular,
ISDN for transmitting and receiving data packets to and from the Internet via an ISDN communication network ISDNW
It is a personal computer having an adapter. However, the terminals T1, T2, T3 and T4 have additional functions, such as an ISD which can access the Internet via a display, extended input means and a powerful processor.
It may be an N-telephone, and thus may execute graphical user interface software and Internet browser software. The terminals T1, T2, T3 and T4 can also represent communication facilities to which a plurality of Internet-enabled terminals are connected. Such communication facilities then establish a connection of one or more terminals to the ISDN communication network ISDNW and the Internet.

[0015] Terminal T1 transmits the addressed data packet to the Internet via channel DT1 and exchange SW1. As a result, the switching center SW1 inserts a data packet into the existing connection to the adaptation device AD, or switches between the terminal T1 and the adaptation device AD, the virtual D in the section between the switching center SW1 and the adaptation device AD. Set a D-channel connection that can also be designed as a channel connection. Exchange SW
1 and the terminal T1 communicate on the OSI layer 2 channel DT1 using the so-called HDLC protocol.
The HDLC protocol makes available transport frames on the so-called ISDN-D channel, in which case data packets are transmitted over the OSI Layer 3 X.3. It is carried in 25 protocols. X. Twenty-five data packets contain data in Internet Protocol (IP). The exchange SW1 communicates with the terminal T via the connection module TR1SW.
1 receives an HDLC data packet. The connection module TR1SW transfers the HDLC frame to the connection module MUX. The coupling module MUX is HDLC
"Process" (handle) the frame, that is,
HD from various sources in multiplex function
The LC frames are combined into one data stream, and in the reverse direction are also called “frame handlers” because data packets are extracted in a demultiplex function to create HDLC frames for various destinations.

Using the address-destination table stored in the exchange SW1, a service access point identifier (SAPI) and a terminal termination point identifier (TEI) are used.
The combining module MUX uses the address included in each HDLC frame consisting of X. It is determined that 25 data packets are directed to the Internet. As a result, the coupling module MUX
Is connected via a connection DSW which may be a so-called Bd channel. 25 data packets to the connection module KOP, and then the connection module KOP
On W, X. 25 data packets are forwarded to the exchange TRANS. The exchange TRANS then connects the TDAD
Above, X. X.25 data packets. Connection module ADTR of adaptation device AD that terminates 25 connections
Send to 1. X. The termination of the 25 connection is also called "packet handling".
That is, the connection module ADTR1 provides a packet handler (PH) function. Next, the adaptation device AD is operated by the X. 25 is transferred to the conversion module KONV.
25 data packets to internet data packets (data packets in internet protocol)
And sends them to the connection module ADTR2. Next, the connection module ADTR2 connects the connection VAC.
1 to transfer an Internet data packet to the Internet access device ACC1. The adaptation device AD and the access device communicate with each other on the connection VAC1, for example, X.400. It communicates via the E.21 protocol, Ethernet (registered trademark) or ATM (asynchronous transfer mode).

In the reverse direction, Internet data packets can be transmitted in a similar manner from access device ACC1 to terminal T1 on a semi-permanent connection between terminal T1 and access device ACC1. The access device ACC1 first transmits a data packet directed to the terminal T1 identified by a destination address (for example, an IP address) to the connection VAC1.
To the adaptation device AD, the adaptation device AD receives the data packet at the connection module ADTR2 and sends it to the conversion module KONV.
X. Converted into 25 data packets and connected module A
Transfer to the exchange TRANS on the connection TDAD via DTR1. The exchange TRANS has an X.400. 25 data packets are sent to the exchange SW1 on the connection TDSW. The switching center SW1 receives the data packet by means of the connection module KOP and routes this data packet on the connection DSW to the coupling module MUX. The coupling module MUX also connects the data packet to the
Separate from other data packets received on SW but not directed to terminal T1, pass the data packet to connection module TR1SW,
The data packet is transferred to the terminal T1 on the HDLC frame.

For example, an e-mail is sent between the terminal T1 and the access device ACC1 on the connection T1-D-ACC1,
The stock prices in the stock market that can be transmitted in this way or displayed on the terminal T1 can be updated with data loaded from the Internet.

The semi-permanent connection between the terminal T1 and the access device ACC1 is completely established on the ISDN communication network ISDNW up to the connection VAC1. That is,
External X. No 25 data networks are required. In addition, the address information in some address fields is
External X. These address fields do not need to be filled, since they are only needed for complex and time-consuming routing in a 25 data network. X. By omitting the 25 data network, the terminal T1 and the exchange SW1
Is X. Internet data packets can be transmitted to each other with the help of HDLC frames, without the help of 25 protocols. The switching center SW1 can then transfer these internet data packets on the connections TDSW and TDAD, on the as-is HDLC frame with the new address, or transfer the data to an alternative Layer 2 It can also be transmitted over a protocol. In addition, X.X. 2
5 using the X.5 protocol. The exchange SW1 and the adaptation device AD for mutual data exchange on the H.25 protocol can be omitted, so that the ISDN
The data throughput on the communication network ISDNW can be increased.

The connection T1-D-ACC1 logically exists between the terminal T1 and the adaptation device AD, and the data packet is transmitted only when necessary.
Since it is a packet data line transmitted to the network, it can be designed as a so-called virtual or logical connection. The data packets to be transmitted on the connection T1-D-ACC1 can also be transmitted on a connection path which has already been exchanged and is available for another connection between the adaptation device AD and the exchange SW1. The connection T1-D-ACC1 can be set up, for example, on the one hand as a so-called "pre-allocated logical link" by a network controller, not shown, and on the other hand the ISDN communication network I
In the case of SDNW, it can also be requested by the terminal T1 or the adaptation device AD. Virtual connection T1
To set D-ACC1, the address-path allocation table is stored in both the switching center SW1 and the adaptation device AD, so that the switching center SW1 and the adaptation device AD must The included address can be used to determine to which data path the data packet should be routed. Such a data packet address is
The exchange SW1 is, for example, a combination of TEI / SAPI included in the HDLC frame, and can be actually dynamically allocated by the adaptation device AD.
The Internet address is valid as long as at least the D channel connection T1-D-ACC1 is held.

In practice, channel DT1 is connected to connection T1-D-
Loaded by data transmission on ACC1. However, despite this, for example, an incoming call intended for terminal T1 can be transmitted on channel DT1. HDLC frame required for ringing and connection T1-D-
The HDLC frame transmitted on ACC1 is the terminal T1
And the exchange SW1 simply need to be provided with a different service access point identifier (SAPI).
Terminal T1 can also represent a group of terminals connected together to an ISDN subscriber line. The HDLC frame can be allocated to different terminals using the terminal termination point identifier (TEI) included in each frame.

In a similar manner to terminal T1, terminal T2 can be connected to access device ACC1 via switching center SW1 and ISDN communication network ISDNW. To this end, the connection T2-D-ACC1 and the connection T1-D-ACC2
Are connected in parallel to the known connection paths DSW, TDS
Although set up on W, TDAD and VAC1, this connection reaches terminal T2 via channel DT2 instead of channel DT1. In the multiplex function, the combining module MUX combines the data packets transmitted by the terminal T2 with the data packets transmitted by the terminal T1, including the data packets of the terminals T1 and T2 and transmitted to the adaptation device AD. , Form a combined data stream. In the reverse direction, the combining module MUX determines which of the respective data packets transmitted by the adaptation device AD are to be forwarded to the terminal T1 or the terminal T2 and accordingly these data packets are transmitted to the terminal T1 or the terminal T2. Transfer to
According to the invention, if another terminal is connected to the switching center SW1 in addition to the terminal T1 or the terminal T2, the combining module MUX can also insert their data into the data stream on the connection DSW.

On the one hand, the connections T1-D-ACC1 and T2-D-ACC1 can be set up on an existing connection path that already exists for the D-channel data line, and at the same time the so-called link access procedure is Used on the channel (LAP-D). On the other hand, connection T
For mass transmission of 1-D-ACC1 and T2-D-ACC1 data packets, a connection channel, in particular a so-called Bd channel, can be connected, in particular, between the switching center SW1 and the adaptation device AD. Exchange S
W1 can establish such a Bd channel on the connection TDSW and on the connection TDAD to the adaptation device AD and maintain the virtual connections T1-D-ACC1 and T2-D-ACC1 on the Bd channel. . On this Bd channel, it is also possible to maintain another packet data line, not shown, for example to the exchange SW1, and thus to a terminal connected to the Internet. If further packet data transmission capacity is required between the exchange SW1 and the adaptation device AD, the exchange SW1 may connect another Bd channel. In this case, the LAP-D protocol is likewise used in the usual way at layer 2 on such a Bd channel.

Although the transmission capacity of the D-channel is actually sufficient for a semi-permanent connection between the terminal and the Internet, a higher transmission capacity is often desired, at least in the short term. In this case, the ISDN communication network ISDN
An additional B-channel connection from W can be requested, for example, from terminal T1 or adaptation device AD. To this end, advantageously, the Internet data packets are transmitted using the Multilink Protocol (MLP),
It is transmitted between the adaptation device AD and the terminal T1. MLP allows parallel data packet transmission between endpoints via separate connection channels ("links") and ensures that different connection channels are treated as a common data channel. In this case, the “Bandwidth Allocation Protocol (BAP: Ban
width AllocationProtoco
l) "and its related" Bandwidth Allocation Control Protocol (BACP) ".
Tion Control Protocol) also facilitates dynamic demands on transmission capacity, particularly dynamic connection and disconnection of connection paths. MLP and BAP
IET within the framework of point-to-point protocols
Specified by F. Here, according to the MLP, the terminal T1, together with the adaptation device AD, maintains a so-called "primary link" on the packet-oriented connection paths DT1, DSW, TDSW and TDAD. For example, if there is another transmission request due to the need to send a large amount of e-mails, the terminal T1 is
1 requests that the B channel connection be switched to the adaptation device AD. With this request, the exchange S
W1 is connected from the connection module TW1SW handling the channel BT1 to the connection module K via the internal connection BSW.
Establish a connection to the OP. As a result, an additional B-channel connection T1-B- to the adaptation device AD via the connection TBSW, the switching center TRANS and the connection TBAD.
ACC1 is set. For example, so-called LAP-B
(Balanced Link Access Procedure) Using a protocol, communication can be performed on the B-channel connection T1-B-ACC1 between the terminal T1 and the adaptation device AD at Layer 2 and the Internet data packet is transmitted on the frame. Are carried directly in a point-to-point protocol. Instead of the point-to-point protocol, another protocol that carries IP data packets that enables the dynamic connection and disconnection of the controlled B-channel can be used.

After connecting the B-channel connection T1-B-ACC1, this connection can also be used in parallel with the connection T1-D-ACC1. This means that the guaranteed bandwidth (64 kbps) is not only for B channel connections,
This is because it can be used on the D-channel connection T1-D-ACC1 as a rule. For example, the D channel connection T1-D
X. Instead of ACC1, If 25 networks were used between the switching center SW1 and the adaptation device AD, it would be difficult to achieve parallel transmission.
This is X. This is because the instantaneous loading of the 25 network must deal with data overflow on different data paths. If the transmission request of the terminal T1 is particularly large, another B channel can be connected. Similarly, the establishment of one or more B-channel connections can be managed by the adaptation device AD, for example, when downloading a larger amount of data from the Internet by the terminal T1. Due to the dynamic connection and disconnection of the B-channel connection, the ISDN communication network ISDNW is loaded with a switched connection only when bandwidth is actually needed. Terminal T1 is actually fixedly connected to the Internet, but the ISD required for the call
It does not impair the expensive and valuable B channel transmission capacity of the N communication network ISDNW.

In addition to the access device ACC1, the access device ACC2 has also reached from the adaptation device AD and thus from the terminals T1, T2, T3 and T4.
For example, the adaptation device AD routes the semi-permanent connection from the terminal T1 to the access device ACC1, while the adaptation device AD routes the semi-permanent connection to the terminal T2 on the connection VAC2 to the access device ACC2. Can be predetermined.
However, it is also possible to set a semi-permanent connection from the terminal T1 to the access device ACC1 and a semi-permanent connection to the access device ACC2. Further, the adaptation device AD can analyze the IP address included in each data packet transmitted by the terminal T1, and can transfer each data packet to the access device ACC1 or the access device ACC2 accordingly.

To determine the charge to terminal T1 for the use of ISDN communication network ISDNW as an access medium to the Internet, switching center SW1, on the one hand, transmits data transmitted over D-channel connection T1-D-ACC1. It determines the amount of packets and, on the other hand, determines the busy time of the B-channel connection T1-B-ACC1, and generates common tariff information therefrom. The exchange SW1 transmits the fee information determined in this manner to a fee registering device (not shown) in the form of a so-called “fee ticket”. This fee registration device can record the fee information for the terminal T1 without complicated post-processing. In fact, the exchange SW1
The amount of data carried on the B-channel connection T1-B-ACC1 can also be determined. However, since a fixed bandwidth (64 kbps) is available on the B channel, the time registration existing in the exchange SW1 to occupy the B channel can be used for the fee registration. However, the switching center SW1 must decide whether to use the B channel for switched calls or for short-term data transmission as described above.

The registration of the amount of data transmitted on the D-channel connection T1-D-ACC1 and the B-channel connection T1-B-ACC1 can also be performed by the adaptation device AD.

In a variant not shown, the connection TD
SW is an ISDN communication network I (not shown).
It can be routed through another facility of the SDNW, for example another switching center, or it can be set up over a virtual connection via a data network.
Then, an ISDN communication network I to a data network, eg, a frame relay network,
The first access device of the SDNW is in each case connected TD
The one or more data packets of the SW are packed into data containers or frames, while the second access device unpacks the data packets from the data containers. The same applies to the operation in the reverse direction.

As shown in the figure, the adaptation device A
D can be connected as an independent facility, for example as a server, upstream of one or more Internet access devices, and without further updating these Internet access devices with the data traffic of the ISDN communication network ISDNW. Can be suitable for However, it is also possible to incorporate the adaptation device AD into one of the access devices ACC1 and ACC2, and it is also possible to connect a special adaptation device upstream of the access devices ACC1 and ACC2, respectively. Furthermore, the adaptation device AD can be integrated in the exchange TRANS.

In the figure, switching center SW1 is shown in a very diagrammatic form, and only a small number of modules, which are essential for representing the invention, are shown. However, in addition, the exchange SW1
Can have connections to other modules, such as another subscriber access module, central or local controllers and intelligent network equipment. Furthermore, the internal configurations of the connection module TR1SW, the coupling module MUX, the connection module KOP and the respective internal connection lines are shown merely as examples and are greatly simplified. Another configuration of the exchange SW1 having a similar function is easily possible.

Another modification of the present invention will be exemplified below using the switching center SW2. Here, as in the terminals T1 and T2, in each case the terminals T3 and T4 respectively have a semi-fixed D-channel connection T3-D-ACC1 or T4-D
-Connected to the Internet via ACC1. The D-channel connection T3-D-ACC1 of the terminal T3 is ISD
The access device ACC1 is reached via the N subscriber line BDT3, the exchange SW2, the connection TSW2, the exchange TRANS, the connection TDAD, and the adaptation device AD. The D-channel connection T4-D-ACC1 of the terminal T4 is ISDN
Instead of subscriber line BDT3, ISDN subscriber line BDT
4 is routed. Here, D-channel connections T1-D-ACC1 and T2-D-ACC1,
D-channel connections T3-D-ACC1 and T4-DA
CC1 can be routed in each case to the common channel of the connection TDAD. However, the exchange TRANS has D-channel connections T1-D-ACC1, T2-D-ACC1,
It is also possible to bundle T3-D-ACC1 and T4-D-ACC1 on a common Bd channel in the direction of the adaptation device AD and unwind them in the opposite direction from the adaptation device AD. These variants allow optimal use of the connection TDAD.

[Brief description of the drawings]

FIG. 1 shows terminals T1, T2, T3 and T4, a switching center SW1 according to the invention and an adaptation device A according to the invention.
FIG. 2D shows a configuration for implementing the method according to the invention with D and the Internet access devices ACC1 and ACC2.

[Explanation of symbols]

ACC1, ACC2 Internet access device AD adaptation device ADTR1, ADTR2, KOP Connection module BDT3, BDT4 Subscriber line BSW Internal connection BT1, BT2, DT1, DT2 Channel DSW, TBAD, TBSW, TDSW, TSW2, V
AC1, VAC2 connection ISDNW ISDN communication network KONV conversion module MUX coupling module SW1, SW2 exchange T1, T2, T3, T4 terminal TRANS exchange

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04M 11/00 303 H04L 13/00 305B

Claims (14)

[Claims] 1. An integrated services digital network (ISDN)
A method for connecting a communication terminal (T1) to the Internet via a communication network (ISDNW), wherein the communication terminal (T1) transmits and receives data using a first protocol of a packet data network. A communication terminal (T1) having an interface device that can be used, wherein the communication terminal (T1) is connected to an exchange (SW1) of an ISDN communication network, and data of the communication terminal is combined with data transmitted or received by another communication terminal (T2) The combined data is transmitted between the switching center (SW1) and the adaptation device (AD) via the data line (TDSW) of the ISDN communication network, and the combined data is transmitted to the adaptation device (AD ), At least one first Internet access device (ACC1, ACC2) ) Is converted to a second protocol that can be interpreted and vice versa, and the combined data is transferred between at least one Internet access device (ACC1, ACC2) and an adaptation device (AD). A method characterized by being transmitted in a second protocol. 2. The method according to claim 1, wherein the data of the communication terminal is a D channel (DT).
1) is transmitted between the communication terminal (T1) and the ISDN communication network, and the data of the communication terminal is transmitted together with the data of another communication terminal.
2. The method according to claim 1, wherein a Bd channel having a capacity of a B channel and capable of transmitting data of a plurality of D channels collectively is used as W). 3. When the data transmitted from the communication terminal (T1) or the data transmitted to the communication terminal (T1) exceeds the transmission capacity of the D channel, at least one B
Method according to claim 1, characterized in that channels (BT1, TBSW, TBAD) are used. 4. At least one B channel (BT1,
A first Internet access device (ACC1, ACC), wherein the TBSW, TBAD) and at least one D channel (DT1) are routed to an adaptation device (AD).
To generate a homogeneous interface for 2),
The adaptation device (AD) has at least one B
Converting the data transmitted on the channels (BT1, TBSW, TBAD) as well as the data transmitted on the at least one D-channel into a second protocol that can be interpreted by the first Internet access device (ACC1, ACC2); 4. The method according to claim 3, wherein the inverse conversion is performed. 5. The adaptation device according to claim 1, wherein the adaptation device transmits the data to at least one access device or an alternative access device according to a destination information signal always specified in the data. Method. 6. X. The method of claim 1, wherein 25 protocols are used as the first protocol. 7. The method of claim 1, wherein a point-to-point protocol is used as the first protocol. 8. An exchange (SW1) is provided with a D channel (DT)
1) determining a first charge from the amount of data transmitted via the switching center (SW1);
4. The method according to claim 3, wherein at least the second fee is determined from the busy time of T1). 9. An integrated services digital network (ISDN)
Communication terminals (T1, T2) via a communication network
(AD) for connecting to the Internet, the adaptation device (AD) being transmitted by a communication terminal in a first protocol of a packet data network via a data line (TDAD) of an ISDN communication network. And a first transmission means (ADTR1) configured to transmit and receive the converted data, wherein the adaptation device (AD) transmits the data to at least one first Internet access device (ACC1,
ACC2) can be converted to a second protocol that can be interpreted,
It also has conversion means (KONV) configured to perform the reverse conversion, and the adaptation device (AD) uses at least one Internet access device (A) using the second protocol.
CC1, ACC2) and at least one Internet access device (ACC1, ACC)
An adaptation device (AD) comprising a second transmission means (ADTR2) configured to receive data from 2). 10. At least one Bd channel (TBAD) having B channel capacity and capable of transmitting a plurality of D channel data collectively can be connected to an adaptation device as a data line of an ISDN communication network. In addition, the first transmission means (ADTR1)
The adaptation device (AD) according to claim 9, further comprising: the adaptation device can transmit and receive data on a Bd channel. 11. An adaptation device, if required for transmission of data to be transmitted by a first Internet access device (ACC1, ACC2) to a communication terminal (T1, T2) connected to an exchange, Via an ISDN communication network (I
SDNW) to the exchange (SW1)
The adaptation device (AD) according to claim 9, characterized in that the first transmission means (ADTR1) is further configured to be able to establish S, TDSW). 12. The transmission capacity of D channels (DT1, DT2) in which data transmitted from communication terminals (T1, T2) or data transmitted to communication terminals (T1, T2) is routed to the respective communication terminals. If more than
The adaptation device (AD) has at least one B
The adaptation device (AD) according to claim 9, characterized in that the first transmission means (ADTR1) is further configured to be able to transmit data to the channel. 13. A communication terminal (T1, T1) via an ISDN (Integrated Services Digital Network) communication network.
2) is a network node having an adaptation device (AD) for connecting to the Internet, wherein the adaptation device (AD) has its own ISDN
Through the data line (TDAD) of the communication network,
A first transmission means (ADTR1) configured to receive data transmitted by the communication terminal in a first protocol of the packet data network, wherein the adaptation device (AD) is configured to Having a conversion means (KONV) configured to convert the data into a second protocol that can be interpreted by at least one first Internet access device (ACC1, ACC2) and vice versa. And the adaptation device itself is in the second protocol and has at least one Internet access device (A
CC1, ACC2) and at least one Internet access device (ACC1, ACC)
2. A network node comprising a second transmission means (ADTR2), adapted to receive data from 2). 14. A communication terminal (T1, T1) via an ISDN (Integrated Services Digital Network) communication network.
2), an exchange (SW) for connecting to the Internet
Connection means (TR1), wherein the exchange is configured such that at least one communication terminal (T1) can connect to the exchange.
SW), wherein the exchange itself transmits data to the communication terminal (T1) according to the first protocol of the packet data network,
And a first connection means (TR1SW) configured to receive data from the communication terminal, and the exchange itself transmits the data of the communication terminal by another communication terminal (T2). Or combining means (MU) configured to be able to combine with the received data.
X), and the exchange itself uses an ISDN communication network (ISD communication network) by using the destination information included in the data of the communication terminal.
NW) to establish a data line (TDSW, TDAD) to an adaptation device (AD) or to transmit data to an ISDN communication network (I
A second connection means (M) configured to be able to determine an already established data line (TDSW, TDAD) to the adaptation device (AD) via the SDNW).
UX, KOP), and the adaptation device (AD) can convert the combined data into a second protocol that can be interpreted by at least one Internet access device (ACC1, ACC2) and vice versa. The adaptation device (AD) converts the converted data into an Internet access device (ACC1, ACC).
2), and the second connection means (MUX, KOP) further comprises a switching center for transmitting communication terminals (T1, T1) on data lines (TDSW, TDAD) via an ISDN communication network (ISDNW).
The switching center (SW) is configured to transmit and receive data combined from the data of 2).
1).