JPH1042004A - Terminal adapter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily attain connection testing between a terminal adapter and a frame relay network by attaining connection testing in a digital line network between the terminal adapters without actually connecting a data terminal. SOLUTION: A key input part 109 is operated, a data transmitting part 102 is started and a data frame(PF) including specified data generated from a specified frame generator 106 is transmitted to the frame relay(FR) network 13 by way of an exclusive line control part 104. A same kind of procedure is executed in the opposite side terminal adapter(TAA) of data communication. Then, DF transmitted from the opposite side TAA by way of the FR network 13 and the exclusive line control part 104 is inputted to a data receiving part 103. Specified data is extracted from received DF and outputted to a comparator 107. The comparator 107 compares transmitted specified data with received specified data and a display part 108 displays that the line is opened at the time of coincidence.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a terminal adapter for connecting a digital terminal to a digital line such as an ISDN network or a dedicated line network.

[0002]

2. Description of the Related Art Conventionally, as this type of device, a digital terminal such as a personal computer is connected to a dedicated line network (line) or ISDN.
2. Description of the Related Art A terminal adapter for connecting to a digital line composed of a network (line) is used. FIG. 5 shows such a conventional terminal adapter. FIG. 5 is a block diagram showing a configuration of each function of a conventional terminal adapter.

First, the configuration of a conventional terminal adapter will be described with reference to FIG. In FIG. 5, 51
Connects the data (digital) terminal 52 to the leased line network 53 and I
A terminal adapter for connecting to a digital network such as an SDN network 54, a data terminal 52 (hereinafter abbreviated as DTE) of a personal computer or the like (or any other digital terminal), and a dedicated terminal 53 (specific data terminal). Is an integrated service digital network (hereinafter abbreviated as ISDN network) for providing digital communication services for general use.

[0004] Further, reference numeral 501 denotes a DTE control unit for controlling communication with the data terminal 52; 502, a data transmission unit for transmitting data from the data terminal 52 to the leased line network 53 or the ISDN network 54; Alternatively, a data receiving unit for receiving data from the ISDN network 54 and transmitting the data to the data terminal 52; a reference numeral 504, a dedicated line control unit for controlling transmission / reception of data to / from the dedicated line network 53;
Is an ISDN control unit for controlling transmission and reception of data to and from the ISDN.

Next, the operation of the conventional terminal adapter will be described with reference to FIG. First, data transmitted from the data terminal (DTE) 52 is input to the DTE control unit 501 of the terminal adapter 51. The received data is sent to the dedicated line control unit 504 via the data transmission unit 502 and transmitted to the other party via the dedicated line network 53.

On the other hand, data received from the leased line network 53 is input to the leased line control unit 504. The received data is transmitted to the DTE controller 501 via the data receiver 503.
And transmitted to the data terminal (DTE) 52.

As described above, when a line failure occurs during operation through the leased line network 53, it is detected by the leased line control unit 504 and notified to the ISDN control unit 505. After connecting the call, the ISDN control unit 505 requests the data transmission / reception units 502 and 503 to switch communication paths. Then, the data transmitting unit 502 switches the data transmission to the ISDN control unit 505 and transmits the data via the ISDN network 54, and the data received from the ISDN network 54
The data is transmitted to the data terminal (DTE) 52 via the SDN control unit 505 and the data receiving unit 503.

As described above, even with the above-described conventional terminal adapter, data communication can be performed by connecting a data terminal, and backup can be performed by the ISDN network in the event of a line failure in the dedicated line network.

[0009]

However, in the above-mentioned conventional terminal adapter, the terminal adapter is connected to a frame relay network (dedicated line network).
If you connect to, if you can connect to the line normally, you need to actually connect the data terminal and test data communication (opening test) between the data terminals,

When a terminal adapter is connected to a cell relay network (dedicated line network), it is determined whether or not connection to the line has been normally made by actually connecting data terminals and testing data communication between the data terminals (opening test). Have to do,

[0011] When backing up a dedicated line of two or more channels via the ISDN network, backup cannot be performed unless all connections of the line requiring backup are successful. If a failure is detected and both of them perform backup, there is a problem that both terminal adapters that have performed backup will be charged.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and can perform a connection test between a terminal adapter and a frame relay network without actually connecting a data terminal. A connection test between a terminal adapter and a cell relay network can be performed without connecting a data terminal.

[0013] Provided is a terminal adapter capable of communicating with only the channel for which backup was successful when backing up a dedicated line of two or more channels, and being able to charge only one terminal adapter when a line failure is detected. The purpose is to do.

[0014]

A terminal adapter according to the present invention comprises a specific frame generator for generating a data frame of a specific pattern, a key input unit, and a comparator for comparing a received data frame with a transmitted data frame. And a display unit for displaying the result of the comparison, which is activated by key input and transmits a data frame of a specific pattern to the terminal adapter of the other party through the frame relay network, and after transmission of the data frame of the specific pattern, The data frame of the specific pattern received from the terminal adapter is compared with the data frame of the specific pattern transmitted, and the comparison result is displayed on the display unit.

A specific cell generator for generating a data cell of a specific pattern, a key input unit, a comparator for comparing a received data cell with a transmitted data cell, and a display unit for displaying a result of the comparison are provided. , Which is activated by a key input, transmits a data cell of a specific pattern to the partner terminal adapter via the cell relay network, and transmits the data cell of the specific pattern received from the partner terminal adapter after transmitting the data cell of the specific pattern, The data is compared with the data cells of the pattern, and the comparison result is displayed on the display unit.

A D-channel call control means for controlling the connection of the channel to be backed up included in the ISDN control section to the ISDN network; a delay correction means for the B channel;
Means for generating a clock having a frequency multiplied by the number of channels connected to 4k and transmitting the clock to the DTE.

The number of a communication partner whose call is rejected is registered in advance, and a calling number for detecting whether or not the calling number of the communication partner having a line failure is a registered number from the calling number of the received call setup message. A detecting unit, a unit included in the ISDN control unit, for rejecting the incoming call if the originating number from the communication partner having the line failure is a registration number, and calling back the incoming call to the originating number that rejected the incoming call Means.

According to the present invention, when connecting a frame relay DTE to a dedicated frame relay network, data frames of a specific pattern are mutually transmitted without connecting the frame relay DTE to a terminal adapter. By displaying the comparison result with the transmitted data frame, the connection test between the terminal adapter and the frame relay network can be easily performed without actually connecting the data terminal.

In connecting the cell relay DTE to a dedicated cell relay network, data cells of a specific pattern are mutually transmitted without connecting the cell relay DTE to a terminal adapter, and a comparison between the received data cell and the transmitted data cell is performed. By displaying the result, a connection test between the terminal adapter and the cell relay network can be easily performed without actually connecting the data terminal.

Regardless of whether the communication call that has started the backup is partially connected or fully connected, by sending a clock having a frequency corresponding to the number of connected channels to the DTE, an incomplete call that fails to connect can be prevented. Even in some cases, except for that, the line can be switched and backup can be performed.

At the time of backup by the ISDN network when a line failure occurs, an incoming call from the communication partner is rejected and the communication is notified to the communication partner by calling it back, so that both devices are not charged. Thus, a terminal adapter can be obtained in which charging can be concentrated only on one device of communication.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is a terminal adapter for connecting a data terminal to a dedicated line network such as a frame relay network and a digital network such as an ISDN network via a frame relay network. Data frame transmitting means for transmitting a data frame of a specific pattern, data receiving means for receiving a data frame via a frame relay network, and received frame comparing means for comparing the received data frame with the transmitted data frame. Display means for displaying the comparison result, and testing the opening of the frame relay network between the terminal adapters, mutually transmitting a data frame of a specific pattern, transmitting the received data frame and By displaying the comparison result with the data frame, the data Simply without connecting a has the effect that the connection test between the terminal adapter and the frame relay network can be implemented.

According to a second aspect of the present invention, the data frame transmitting means transmits a specific pattern data frame to a frame relay network and a specific frame generator for generating a specific pattern data frame. And a key input unit for generating an activation signal for transmitting a data frame of a specific pattern to the data transmission unit, wherein the key input unit is operated to start an opening test of a frame relay network. By transmitting data frames of a specific pattern to each other and displaying the comparison result between the received data frame and the transmitted data frame, the terminal adapter and the frame relay can be easily connected without actually connecting the data terminal. This has the effect that a connection test with the network can be performed.

According to a third aspect of the present invention, there is provided a terminal adapter for connecting a data terminal to a dedicated line network such as a cell relay network and a digital network such as an ISDN network.
A data cell transmitting means for transmitting a data cell of a specific pattern via a cell relay network, a data receiving means for receiving a data cell via a cell relay network, and a receiving means for comparing the received data cell with the transmitted data cell A cell comparing means and a display means for displaying a result of the comparison, which test the opening of the cell relay network between the terminal adapters, mutually transmit data cells of a specific pattern, and receive the received data cells. By displaying the result of comparison with the transmitted data cell, the connection test between the terminal adapter and the cell relay network can be easily performed without actually connecting the data terminal.

According to a fourth aspect of the present invention, the data cell transmitting means generates a specific pattern of data cells and a data transmitting section for transmitting the specific pattern data cells to a cell relay network. And a key input unit for generating an activation signal for transmitting a data cell of a specific pattern to the data transmission unit, wherein the key input unit is actuated to start a cell relay network opening test. By transmitting data cells of a specific pattern to each other and displaying the comparison result between the received data cells and the transmitted data cells, the terminal adapter and the cell relay network can be easily connected without actually connecting a data terminal. Has the effect that a connection test can be performed.

According to a fifth aspect of the present invention, in a terminal adapter for connecting a data terminal to a digital network such as a leased line network or an ISDN network, a line failure is detected in the leased line network and the line failure is detected in the ISDN network. Means for automatically switching calls by the number of detected channels, delay correction means for correcting delay for each of the channels from which the call was transmitted, and setting the frequency of a data transmission clock to be transmitted to the data terminal to ISDN. Clock control means for changing the number of channels to be switched to the network, according to the number of channels successfully connected to the data terminal by the ISDN network when the channel is switched from the leased line network to the ISDN network due to a line failure. The clock of the frequency is transmitted, and the clock of the frequency corresponding to the number of connected channels is transmitted. By sending a click to the data terminal, to switch the line except it even when there is not completed call connection fails, an effect that can be backed up.

According to a sixth aspect of the present invention, in the dedicated line control unit for automatically transmitting a switch call by the number of the channels, the dedicated line control unit controls transmission and reception of data to and from a dedicated line network and detects a line failure. And an ISDN control unit for controlling transmission and reception of data to and from the ISDN network and receiving a line fault in the leased line network and transmitting a call to the ISDN network by the number of channels in which the line fault is detected. Irrespective of whether the communication call that started the backup is partially connected or fully connected, by sending a clock of a frequency corresponding to the number of connected channels to the data terminal, an incomplete call that failed to be connected. Even if there is, there is an effect that the line can be switched and backup can be performed except for that.

According to a seventh aspect of the present invention, in a terminal adapter for connecting a data terminal to a digital network such as a leased line network or an ISDN network, data transmission / reception to / from the leased line network is controlled to detect a line failure. A dedicated line control unit, a calling party number for rejecting an incoming call in advance, and a calling number detecting means for detecting whether or not the calling number of the called party transmitted from the called party matches the registered number;
Control of data transmission / reception to / from the N network, and upon detection of a line failure in the leased line network, calls are transmitted to the ISDN network by the number of channels in which the line failure is detected;
An ISDN control unit including means for rejecting an incoming call if the calling number from the communication partner is the number of the channel in which the line failure was detected and the registration number of the calling number detecting unit;
Callback control means for rejecting the incoming call and calling back to the caller when the calling number received via the network matches the registered number and is found to be the communication destination transmitted due to a line failure. In this case, outgoing calls are concentrated only on one side, and when a line failure occurs, backup is performed by the ISDN network. Has the effect that the billing can be concentrated on only one device of the communication without being charged on both devices.

Hereinafter, based on the attached drawings and FIGS.
An embodiment of the present invention will be described in detail. FIG. 1 is a block diagram showing the configuration of each function of the terminal adapter according to the first embodiment of the present invention. FIG. 2 is a block diagram showing the configuration of each function of the terminal adapter according to the second embodiment of the present invention. FIG. 3 is a block diagram showing a configuration of each function of a terminal adapter according to a third embodiment of the present invention;
FIG. 4 is a block diagram showing a configuration of each function of the terminal adapter according to the fourth embodiment of the present invention.

First, the configuration of the terminal adapter according to the first embodiment of the present invention will be described with reference to FIG. In FIG. 1, reference numeral 11 denotes a frame relay DTE1.
2 is a frame relay network (FR network) 13 and ISDN network 1
Terminal adapter for connecting to a digital network such as 4
2 is a frame relay DTE composed of a data terminal such as a personal computer (or any other digital terminal), 13
Is a frame relay network (FR network) composed of a dedicated line dedicated to a specific frame relay DTE 12 (a plurality of FR networks are possible);
Is an integrated service digital network (hereinafter abbreviated as ISDN network) for providing digital communication services for general use.

Reference numeral 101 denotes a frame relay DTE12.
A data transmission unit that transmits a data frame from the frame relay DTE 12 to the frame relay network 13 or the ISDN network 14;
103 receives a data frame from the frame relay network 13 or the ISDN network 14 and performs frame relay DTE1.
2, a data line receiving unit 104 for controlling transmission and reception of data frames to and from the frame relay network 13, and an ISDN control unit 105 for controlling data transmission and reception to and from the ISDN network.

Reference numeral 106 denotes a specific pattern (for example, 5
11) a specific frame generator for generating a data frame (hereinafter, referred to as specific data) 107; a reception frame comparator 107 for comparing the specific data transmitted with the specific data received from the destination terminal adapter;
Reference numeral 08 denotes a display unit for displaying the result of comparison by the reception frame comparator 107, and reference numeral 109 denotes a key input unit for generating a signal for activating the data transmission unit 102 to transmit specific data from the specific frame generator 106. The data receiving unit 103, the received frame comparator 107, the display unit 108
Respectively correspond to the data receiving means, the received frame comparing means, and the displaying means described in the claims.

Next, the operation of the terminal adapter according to the first embodiment of the present invention will be described with reference to FIG. First, the data frame transmitted from the frame relay DTE 12 is input to the DTE control unit 101 of the terminal adapter 11. The received data frame is sent to the leased line control unit 104 via the data transmission unit 102 and transmitted to the destination terminal adapter via the frame relay network 13.

On the other hand, the data frame received from the frame relay network 13 is input to the dedicated line control unit 104.
The received data frame is sent to the DTE control unit 101 via the data receiving unit 103, and the frame relay DT
It is sent to E12.

The above description is for the general operation of the terminal adapter, and is the same as in the above-described conventional example. However, the purpose of the present embodiment is that, for example, when a dedicated line is opened, the frame relay DTE1
In order to perform a connection test between terminal adapters without using the terminal 2, the operation of the connection test will be described in detail below. First, when a key is input by operating the key input unit 109, a signal output from the key input unit 109 activates the data transmission unit 102 to generate a data frame including specific data generated from the specific frame generator 106, and The packet is transmitted to the frame relay network 13 via the unit 104.

The other terminal adapter of data communication for testing a dedicated line (frame relay network) between terminal adapters performs the same procedure. Then, the data frame transmitted from the partner terminal adapter via the frame relay network 13 and the dedicated line control unit 104 is input to the data receiving unit 103. At this time, the data receiving section 103 extracts specific data from the received data frame and outputs it to the received frame comparator 107. The reception frame comparator 107 compares the specific data that has already been transmitted with the specific data that has been received, and if they match, displays on the display unit 108 that the line is open.

As described above, the terminal adapter according to the present embodiment transmits and receives specific data without connecting a frame relay DTE (data terminal).
Compare the specific data sent with the specific data received,
By displaying the comparison result, a connection test between the terminal adapter and the frame relay network can be easily performed.

Next, the configuration of the terminal adapter according to the second embodiment of the present invention will be described with reference to FIG. In FIG. 2, reference numeral 21 denotes a terminal adapter for connecting a cell relay DTE 22 to a digital network such as a cell relay network 23 and an ISDN network 24; 22, a cell relay DTE including a data terminal such as a personal computer (which may be any other digital terminal); Cell relay DTE
Reference numeral 12 denotes a cell relay network (or a plurality of cell lines) comprising dedicated lines, and reference numeral 24 denotes an integrated service digital network (hereinafter abbreviated as ISDN network) for providing digital communication services for general use.

Reference numeral 201 denotes a DTE control unit for controlling communication with the cell relay DTE 22, and reference numeral 202 denotes a cell relay DT.
The data cell from E22 is transferred to cell relay network 23 or IS
A data transmitting unit 203 for transmitting data to the DN network 24; a data receiving unit 203 for receiving data cells from the cell relay network 23 or the ISDN network 24 and transmitting the data cells to the cell relay DTE 22;
Reference numeral 04 denotes a dedicated line control unit that controls transmission and reception of data cells to and from the cell relay network 23, and reference numeral 205 denotes an ISDN control unit that controls transmission and reception of data to and from the ISDN network.

Reference numeral 206 denotes a specific pattern (for example, 5
11) a specific cell generator for generating data cells (hereinafter referred to as specific data); 207, a receiving cell comparator for comparing transmitted specific data with specific data received from the destination terminal adapter; A display unit for displaying a result of the comparison in the reception cell comparator 207;
A key input unit 209 generates a signal for activating the data transmission unit 202 to transmit specific data from the specific cell generator 206. The data receiving section 203, the received cell comparator 207, and the display section 208 correspond to the data receiving section, the received cell comparing section, and the display section, respectively.

Next, the operation of the terminal adapter according to the second embodiment of the present invention will be described with reference to FIG. First, the data cell transmitted from the cell relay DTE 22 is stored in the DTE controller 20 of the terminal adapter 21.
1 is input. The received data cell is the data transmission unit 2
The signal is transmitted to the dedicated line control unit 204 via the communication line 02 and transmitted to the destination terminal adapter via the cell relay network 23.

On the other hand, the data cells received from the cell relay network 23 are input to the dedicated line control unit 204. The received data cells are sent to the DTE control unit 201 via the data receiving unit 203, and sent to the cell relay DTE22.

The above is a description of the general operation of the terminal adapter, and is the same as that of the above-described conventional example. However, the purpose of the present embodiment is to perform a connection test between terminal adapters without using the cell relay DTE12, for example, when a dedicated line is opened, so that the operation of the connection test will be described in detail below. explain. First, when a key is input by operating the key input unit 209, a signal output therefrom is transmitted to the data transmission unit 2
02 is activated to generate a data cell including the specific data generated from the specific cell generator 206, and send it to the cell relay network 23 via the dedicated line control unit 204.

A partner terminal adapter for data communication for testing a dedicated line (cell relay network) between terminal adapters performs the same procedure. Then, the cell relay network 23 and the dedicated line control unit 2
The data cell transmitted via the line 04 is input to the data receiving unit 203. At this time, the data receiving section 203 extracts specific data from the received data cells and outputs the extracted data to the received cell comparator 207. The reception cell comparator 207
The specific data that has already been transmitted is compared with the specific data that has been received, and if they match, a display indicating that the line is open is displayed on the display unit 208.

As described above, the terminal adapter according to the present embodiment transmits and receives specific data without connecting a cell relay DTE (data terminal), compares the transmitted specific data with the received specific data, By displaying the comparison result, a connection test between the terminal adapter and the frame relay network can be easily performed.

Next, the configuration of the terminal adapter according to the third embodiment of the present invention will be described with reference to FIG. In FIG. 3, reference numeral 31 denotes a terminal adapter for connecting a data (digital) terminal 32 to a digital network such as a leased line network 33 and an ISDN network 34, and 32 denotes a data terminal of a personal computer or the like (which may be any other digital terminal). Reference numeral 33 denotes a dedicated network (or a plurality of dedicated lines) dedicated to a specific data terminal, and reference numeral 34 denotes an integrated service digital network (hereinafter abbreviated as an ISDN network) for providing digital communication services for general use.

Reference numeral 301 denotes a DTE control unit for controlling communication with the data terminal 32; 302, a data transmission unit for transmitting data from the data terminal 32 to the leased line network 33 or the ISDN network 34; Alternatively, a data receiving unit for receiving data from the ISDN network 34 and sending the data to the data terminal 32, a dedicated line control unit 304 for controlling the transmission and reception of data to and from the dedicated line network 33, and a reference numeral 305 for the ISDN network 34
Is an ISDN control unit for controlling transmission and reception of data to and from the ISDN.

A clock 306 outputs a clock obtained by multiplying the B channel clock (64K) by the number of channels to be backed up due to a line failure. A clock control unit 307 for reducing the number of clocks per minute is a delay correction unit 307 for correcting a delay of a channel connected to the ISDN network 34 for backup.
Note that the clock control unit 306 and the delay correction unit 307 correspond to a clock control unit and a delay correction unit described in claims, respectively.

Next, the operation of the terminal adapter according to the third embodiment of the present invention will be described with reference to FIG. First, data transmitted from the data terminal 32 is input to the DTE control unit 301 of the terminal adapter 31. The received data is transmitted to the dedicated line control unit 304 via the data transmission unit 302 and transmitted to the destination terminal adapter on the other side via the dedicated line network 33.

On the other hand, data received from the leased line network 33 is input to the leased line control unit 304. The received data is transmitted to the DTE controller 301 via the data receiver 303.
To the data terminal (DTE) 32.

As described above, when a line failure occurs during operation through the leased line network 33, the failure is detected by the leased line control unit 304 and notified to the ISDN control unit 305. The ISDN control unit 305 issues calls for the number of channels to be backed up, and when a call is set, requests the data transmission unit 302 and the data reception unit 303 to switch communication paths. Then, the data transmission unit 302 switches the data transmission to the ISDN control unit 305 and
Data transmitted via the network 34 and received from the ISDN network 34 is transmitted to the data terminal (DTE) 32 via the ISDN control unit 305 and the data receiving unit 303.

In the above, when the leased line control unit 304 detects a line failure, the ISDN control unit 305 sends an ISDN
Calls are transmitted to the network 34 by the number of channels. After the connection of the call, the delay of the connected B channel is corrected by the delay correction unit 307, and the continuation of the data communication at the time of the line failure is started. When an uncompleted call occurs due to poor network conditions during a call connection operation, the speed of the clock transmitted from the clock control unit 306 to the data terminal 32 via the DTE control unit 301 is reduced. Then, a clock having a speed corresponding to the number of connected channels is transmitted.

As described above, the terminal adapter according to the present embodiment, when the communication path (line) is switched, except for the channels that could not be switched, except for the channels corresponding to the number of switched channels. Can be switched, only the switchable channels can be switched at the time of line switching, so that even if all the channels for which connection is requested cannot be switched, it is less likely that data communication will not be possible. be able to.

Next, the configuration of a terminal adapter according to a fourth embodiment of the present invention will be described with reference to FIG. In FIG. 4, reference numeral 41 denotes a terminal adapter for connecting a data terminal 42 to a digital network such as a leased line network 43 and an ISDN network 44; 42, a data terminal (DTE) of a personal computer (or any other digital terminal);
3 is a dedicated network dedicated to a specific data terminal (a plurality of dedicated networks may be used),
Reference numeral 44 denotes an integrated services digital network (ISDN) for providing digital communication services for general use.

Reference numeral 401 denotes a DTE control unit for controlling communication with the data terminal 42; 402, a data transmission unit for transmitting data from the data terminal 42 to the leased line network 43 or the ISDN network 44; Or a data receiving unit that receives data from the ISDN network 44 and sends it to the data terminal 42; 404, a dedicated line control unit that controls transmission and reception of data to and from the dedicated line network 43;
IS that includes a means for rejecting the incoming call if the outgoing number from the communication partner (also transmitted from this side) is a registered number due to transmission and reception of data to
It is a DN control unit.

Reference numeral 407 further stores a destination number for rejecting an incoming call, and, based on the result of detecting a line failure by the communication partner, a calling number of the communication destination based on a call setting message transmitted via the ISDN network 44. The calling number detecting unit 406 checks whether the registered number matches the registered number. The communication transmitted from the call setting message received by the calling number detecting unit 407 when the calling number matches the registered number. If it is determined that the destination is the other party, the ISDN control unit 4
This is a callback control unit that calls back to the caller detected after rejecting the incoming call at 05. Note that the callback control unit 406 and the calling number detection unit 407 correspond to the callback control unit and the calling number detection unit described in the claims, respectively.

Next, the operation of the terminal adapter according to the fourth embodiment of the present invention will be described with reference to FIG. First, the data transmitted from the data terminal 42 is input to the DTE control unit 401 of the terminal adapter 41. The received data is sent to the dedicated line control unit 404 via the data transmission unit 402 and transmitted to the destination terminal adapter on the other side via the dedicated line network 43.

On the other hand, data received from the leased line network 43 is input to the leased line control unit 404. The received data is transmitted to the DTE control unit 401 via the data receiving unit 403.
To the data terminal (DTE) 42.

As described above, when a line failure occurs during operation through the leased line network 43, it is detected by the leased line control unit 404 and notified to the ISDN control unit 405. The ISDN control unit 405 transmits the call for the number of channels to be backed up, and requests the data transmission unit 402 and the data reception unit 403 to switch communication paths. Then, the data transmission unit 402 sets the data transmission to IS
Automatically switch to the DN control unit 405 to switch to the ISDN network 44
And the data received from the ISDN network 44 is transmitted to the data terminal (DTE) 42 via the ISDN control unit 405 and the data receiving unit 403.

In the above description, when the leased line control unit 304 detects a line failure, the ISDN control unit 305
Calls are transmitted to the network 34 as many as the number of channels with line faults. In this case, when a line failure is first detected at the communication partner and a switching operation occurs, a call setup message is notified to the ISDN control unit 405 via the ISDN network 44. At this time, the calling number detecting unit 407 checks the calling number of the communication partner from the notified call setting message, and when it detects that it is the number registered for rejecting the incoming call,
This is notified to the SDN control unit 405. If the ISDN control unit 405 finds that the number is the transmission destination number transmitted also due to a line failure, the ISDN control unit 405 rejects the incoming call and, under the control of the callback control unit 406, controls the ISDN control unit. Call back (call) to the caller number detected via 405.

As described above, the terminal adapter according to the present embodiment can refuse an incoming call from a communication partner and call back when switching a communication path (line). Can be specified as one.

[0062]

The present invention has the following effects as apparent from the above embodiment. The terminal adapter according to the present invention is configured as described above, and in particular, when connecting the frame relay DTE to a dedicated frame relay network, mutually transmits a data frame of a specific pattern, and receives the received data frame and the transmitted data frame. By displaying the result of comparison with the frame, a connection test between the terminal adapter and the frame relay network can be easily and easily performed without actually connecting the frame relay DTE.

The terminal adapter according to the present invention is configured as described above. In particular, when the cell relay DTE is connected to the dedicated cell relay network, data cells of a specific pattern are mutually transmitted and transmitted with the received data cells. By displaying the result of the comparison with the data cell, the connection test between the terminal adapter and the cell relay network can be easily and easily performed without actually connecting the cell relay DTE.

The terminal adapter according to the present invention is configured as described above. In particular, when a plurality of channels are backed up by the ISDN network, irrespective of whether the communication call that started the backup is partially connected or fully connected,
The clock of the frequency corresponding to the number of connected channels is D
By transmitting to TE, even if there is an incomplete call that failed to connect, the line is switched except for that,
Backup can be performed.

The terminal adapter according to the present invention is configured as described above. In particular, when a line failure is detected, the terminal adapter rejects an incoming call from a communication partner and calls it back up when backing up by the ISDN network. By doing so, the billing can be concentrated on only one device of communication without being billed on both devices.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of each function of a terminal adapter according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of each function of a terminal adapter according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of each function of a terminal adapter according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of each function of a terminal adapter according to a fourth embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of each function of a conventional terminal adapter.

[Explanation of symbols]

 11, 21, 31 Terminal adapter 12, 42, 52 Data terminal 22 Frame relay DTE (data terminal) 32 Cell relay DTE (data terminal) 33, 43, 53 Dedicated line network 13 Frame relay network 23 Cell relay network 14, 24, 34 ISDN Networks 41, 51 terminal adapters 44, 54 ISDN networks 101, 201, 301 DTE control units 102, 202, 302 data transmission units 103, 203, 303 data reception units 104, 204, 304 dedicated line control units 105, 205, 305 ISDN Control unit 401, 501 DTE control unit 402, 502 Data transmission unit 403, 503 Data reception unit 404, 504 Dedicated line control unit 405, 505 ISDN control unit 106 Specific frame generator 206 Specific cell generator 107 Received frame comparison 207 received cell comparator 108, 208 display unit 109, 209 key input unit 306 clock control unit 307 delay correcting section 406 call-back controller 407 shots number detecting unit

Claims (7)

[Claims] 1. A terminal adapter for connecting a data terminal to a dedicated line network such as a frame relay network and a digital network such as an ISDN network, and a data frame transmitting means for transmitting a data frame of a specific pattern via the frame relay network. Terminal adapter comprising: a data receiving means for receiving a data frame via a frame relay network; a received frame comparing means for comparing the received data frame with the transmitted data frame; and a display means for displaying the comparison result. A terminal adapter for testing the opening of a frame relay network between the terminals. 2. A specific frame generator for generating a data frame of a specific pattern;
A data transmission unit for transmitting a data frame of a specific pattern to a frame relay network; and a key input unit for generating an activation signal for transmitting the data frame of the specific pattern to the data transmission unit, activating the key input unit 2. The terminal adapter according to claim 1, wherein an opening test of the frame relay network is started. 3. A terminal adapter for connecting a data terminal to a dedicated line network such as a cell relay network and a digital network such as an ISDN network, wherein data cell transmitting means for transmitting data cells of a specific pattern via the cell relay network, A cell relay between terminal adapters, comprising: data receiving means for receiving a data cell via a network; receiving cell comparing means for comparing a received data cell with a transmitted data cell; and display means for displaying a comparison result. A terminal adapter characterized by testing the opening of a network. 4. A data cell transmitting means for generating a specific pattern data cell, a data transmitting unit for transmitting a specific pattern data cell to a cell relay network, and transmitting a specific pattern data cell. 4. The terminal adapter according to claim 3, further comprising: a key input unit that generates an activation signal to the data transmission unit, wherein the key input unit is operated to start a cell relay network opening test. 5. A terminal adapter for connecting a data terminal to a digital network such as a leased line network or an ISDN network.
Means for detecting a line failure in the leased line network and automatically transmitting a switched call to the ISDN network by the number of channels in which the line failure is detected; delay correction means for correcting delay for each of the channels from which the call is transmitted; Clock control means for changing the frequency of a data transmission clock to be transmitted to the data terminal according to the number of channels for switching to the ISDN network.
A terminal adapter for transmitting a clock having a frequency corresponding to the number of channels successfully connected to an ISDN network to a data terminal when switching channels to the network. 6. A dedicated line control unit for controlling transmission / reception of data to / from a leased line network and detecting a line failure, the unit automatically transmitting a switched call by the number of channels.
An ISDN control unit for controlling transmission / reception of data to / from the network, and receiving a detection of a line failure in the leased line network and transmitting a call to the ISDN network by the number of channels in which the line failure is detected. 5. The terminal adapter according to 5. 7. A terminal adapter for connecting a data terminal to a digital network such as a leased line network or an ISDN network.
A dedicated line control unit that controls transmission and reception of data to and from the dedicated line network and detects a line failure, and registers in advance a callee number that rejects an incoming call, and the calling number of the communication partner transmitted from the communication partner is the registration number. Calling number detection means for detecting whether they match or not, and controlling transmission and reception of data to and from the ISDN network, and
Calls are sent to the N network by the number of channels on which a line failure is detected, and if the outgoing number from the communication partner is the number of the channel on which the line failure was detected, and if it is the registration number of the calling number detection unit, the incoming call is received. ISDN including means of rejection
A control unit and a callback for rejecting the call and calling back to the caller when the calling number received via the ISDN network matches the registration number and is determined to be the communication destination transmitted due to a line failure. Control means,
A terminal adapter characterized in that outgoing calls are concentrated on one side only.