JP2982465B2 - ISDN terminal equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an integrated digital communication network (ISDN) which is connected to an ISDN terminal for communication.

[0002]

2. Description of the Related Art Conventionally, this type of terminal apparatus sets up a call to an ISDN from a D channel and performs communication by connecting to one of two B channels of 64 kbps connected to the ISDN.

FIG. 5 shows a conventional outgoing / incoming sequence between ISDN terminals. 1 is an originating ISDN terminal (abbreviated as terminal), 2 is INS64 (ISDN network),
Reference numerals 3 and 4 denote terminals on the receiving side. In FIG. 5, terminal 1 sends a call setup message 11 to ISDN 2 when making a call. The ISDN 2 that has received this sends a call setup message 12 to the terminal 3. Next, the ISDN 2 sends a call setting acceptance message 13 to the terminal 1. The terminal 3 sends a call message 14 to the ISDN network 2,
The network 2 sends a call message 15 to the terminal 1. next,
The terminal 3 sends a response message 16 to the ISDN network 2,
The ISDN network 2 sends a response message 17 to the terminal 1,
A call confirmation message 18 is sent to the terminal 3 to terminate the call setup, and the terminals 1 and 3 start communication.

As described above, the conventional ISDN terminal performs data communication at 64 kbps from one B channel.

[0005]

However, the conventional ISDN terminal has a problem that the communication speed is limited to 64 kbps.

An object of the present invention is to provide an excellent ISDN terminal capable of performing communication at 128 kbps and also performing conventional 64 kbps communication by using two B channels.

[0007]

According to the present invention, in order to achieve the above object, data divided into two by an integrated digital communication network is transmitted to two B-channels.
When transmitting data at kbps , D
Identifying the order of the data divided into channel signals
To insert and output an identifier for
The divided data based on the received identifier
Equipped with output data reversal prevention means.
It is possible to output received data in a proper order.

[0008]

Therefore, according to the present invention, the receiving terminal refers to the destination sub-address information to obtain the 64k
Since communication of bps or 128 kbps can be identified, communication can be performed at any communication speed.

[0009]

FIG. 1 shows an ISDN terminal according to an embodiment of the present invention. Reference numerals 21 and 22 denote ISDN terminals connected to the ISDN network 23, which communicate at 128 kbps by using two B channels. Reference numerals 24A and 24B denote CPUs, which are connected to data input devices 26A and 26B, data output devices 27A and 27B, a communication control circuit 28, and B channel delay correction circuits 29A and 29B via data buses 25A and 25B. The CPUs 24A and 24B operate the data input device 2 during transmission.
6 kbps or 128 kbps from the call setting message input from 6A or B and from the call setting message output from the communication control circuit 28A or B at the time of reception.
, And controls the B-channel delay correction circuits 29A and 29B.

The communication control circuits 28A and 28B are transmission / reception means. In 64 kbps communication, when making a call, a call setting for connecting the B1 channel or the B2 channel is performed as in the conventional example, and data is transmitted / received in one channel. I do. 128 kb
In the ps communication, at the time of calling, a call setting for connecting the B1 channel and the B2 channel is performed, transmission data is divided into the first half and the second half data, and transmitted and received in parallel to the B1 channel and the B channel.

The CPUs 24A and 24B are anti-reverse means for controlling the communication control circuits 28A and 28B in the case of 128 kbps communication so as to prevent the first half data and the second half data from being reversed. Channel delay correction circuit 29
A and B are delay correction means for correcting the delay of the second half message received by the communication control circuits 28A and 28B and outputting the corrected data to the data output devices 27A and 27B in 128 kbps communication.

Next, the operation of the ISDN terminal of this embodiment will be described. FIG. 2 is a diagram showing the division of transmission data and the response of the B channel. The transmitting terminal 21 in FIG.
In the kbps communication, the transmission data 31 is divided into the first half data (U) and the second half data (R) and transmitted from the B1 channel and the B2 channel, and the receiving terminal 22 receives this as the reception message 32. 128 kbp
The communication of s is specified by the call setup message sent to the D channel.

FIG. 3 shows the format of a call setup message in 128 kbps communication. The information element of the call setup message specifies the destination subaddress 34, the destination subaddress content length 35, the subaddress type 36, the even number or odd number display 37 indicating the B1 channel or B2 channel, the first half data (U), or the second half data (R). And the destination sub-address area 38 for writing destination sub-address information. Upon receiving this call setup message, the receiving side sends the first half data (U) to either the B1 channel or the B2 channel.
Alternatively, it can be identified whether the latter half data (R) is transmitted.

For example, the ISDN terminal 21 includes a call setup message for transmitting the first half data as shown in FIG.
As the 5-byte data of the destination sub address 38, "UP
A fixed pattern of “PER” is inserted, and a pattern of “LOWER” is inserted in the latter half data, and a call is made from the communication control circuit 28 A. Then, the receiving terminal 22 sends a call setting message including the pattern from the communication control circuit 28 B. When receiving, the CPU 24B performs an incoming call operation to communicate at 128 kbps, and the received data including the sub address “UPPER” is set to “L” as the first half data.
The received data "OWER" sets the communication control circuit 28B as the latter half data.

That is, the destination subaddress information of the call setup message serves as identification information for preventing data reversal for transmission without reversing the order of the divided data.

FIG. 4 shows an outgoing / incoming call sequence between the ISDN terminal 21 shown in FIG. 1 as a transmitting terminal and the ISDN terminal 22 as a receiving terminal. I in FIG.
Communication control circuits 28A, B of SDN terminals 21 and 22
A response acknowledgment message 18 is transmitted and received between the ISDN 23 and the call setup message 11 similar to the conventional example of FIG. 4 to set the B1 and B2 channels through the D channel. The CPU 24B on the receiving side includes the communication control circuit 2
128 kb from the call setup message 11
ps communication, and B1 channel, B
The correspondence between the two channels and the first half data (U) and the second half data (R) is identified.

When the B1 and B2 channels are set between the ISDN terminals 21 and 22, the communication control circuit 28A in the transmission side ISDN terminal 21 transmits a message input from the data input device 26A under the control of the CPU 24A to the state shown in FIG. And divided into the first half data (U) and the second half data (R) and transmitted alternately to the corresponding B1 and B2 channels.

In the ISDN terminal 22, the communication control circuit 28B receives the first half data (U) and the second half data (R) from the terminal 21 and outputs them. The CPU 24B identifies the correspondence between the two B channels and the first half data (U) and the second half data (R) based on the destination subaddress information of the call setting message, and inputs the data to the B channel delay correction circuit 29B without reversing the data. B channel delay correction circuit 2
9B corrects the delay by storing the input first-half data and second-half data and alternately outputting them to the data output device 29B in the order of the first-half and second-half data. The data output device 29B outputs received data in a normal order by this input.

As described above, according to the above-described embodiment, the receiving terminal can distinguish the first half data and the second half data transmitted to the channel in B1 and B, so that the output of the reception data in which the channel data is inverted can be output. 64 kb
Communication at ps or 128 kbps can be performed.

[0020]

According to the present invention, as is apparent from the above embodiment,
The following effects are obtained.

When performing 128 kbps communication, data inversion can be prevented. 64 kbps, or 12
There is an effect that data can be automatically transmitted at a communication speed of 8 kbps.

[Brief description of the drawings]

FIG. 1 is a block diagram of an ISDN terminal showing one embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a correspondence between transmission data division and a B channel in the present embodiment.

FIG. 3 shows a format of a call setup message in 128 kbps communication in the embodiment.

FIG. 4 is a flowchart showing an outgoing / incoming sequence between ISDN terminals according to the embodiment;

FIG. 5 is a flowchart showing a conventional outgoing / incoming sequence between ISDN terminals.

[Explanation of symbols]

 21, 22 ISDN terminal 23A, B ISDN network 24A, B CPU 26A, B data input device 27A, B data output device 28A, B Communication control circuit 29A, B B channel delay correction circuit

Claims (2)

(57) [Claims] 1. A call setup for connecting one or two B-channels having a communication speed of 64 kbps, connected to an Integrated Services Digital Network (ISDN), performing data transmission of 64 kbps in the case of one channel, and performing two-channel data transmission. In this case, the transmission / reception means for transmitting data at 128 kbps by transmitting the data divided into two to two B channels is used .
An ISDN terminal device having
Identifying the order of the data divided into channel signals
To insert and output an identifier for
The divided data based on the received identifier
Equipped with output data inversion prevention means to reverse the split data
ISDN terminal device that performs data transmission without causing a problem . 2. The IS according to claim 1, wherein the sub-address information of the call setup message is used as the signal of the D channel.
DN terminal device.