JP2937777B2 - 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 ISDN terminal device.

[0002]

2. Description of the Related Art A conventional ISDN terminal device will be described with reference to the drawings.

FIG. 4 is a block diagram showing an example of a conventional ISDN terminal device.

In FIG. 4, this conventional example is disclosed in
No. 230835 discloses the contents disclosed from “combined terminal device”, and includes a control unit (hereinafter, PC) 110 and a communication unit (hereinafter, TR) 120, and a common memory (hereinafter, CMM) is provided between the two. ) 130 through which data is exchanged.

[0005] The PC 110 has a processor (hereinafter, referred to as a processor).
CPU) 111, memory (hereinafter, MEM) 112, I /
The CPU 11 includes O controllers (hereinafter, I / O) 113 and 114, an external auxiliary storage device (hereinafter, EXM) 115, and a display device (hereinafter, DPE) 116.
1 executes an instruction in the MEM 112, exchanges data via the CMM 130, and EX via the I / Os 113 and 114.
It exchanges data with the M115, sends data to the DPE 116, and the like.

On the other hand, TR 120 is composed of CPU 121, ME
M122, codec (hereinafter, CODEC) 123, L
The CPU 121 includes an APD circuit (hereinafter, LAPD) 124, a speed conversion circuit (hereinafter, STR) 125, an S interface circuit (hereinafter, SIF) 126, and an encryption / decryption circuit (hereinafter, CRDCR) 127.
Executes the instruction in the MEM 122, exchanges data with the PC 110 via the CMM 130, and executes the CODEC1 of the audio signal.
23, and controls the decoding of the received audio signal by the CODEC 123,
It controls transmission and reception of data signals via the PD 124 and the STR 125, and performs transmission and reception with the ISDN network via the SIF 126.

The SIF 126 and the CODEC 123-
CRDCR127 intervenes between STR125,
The transmission signal is encrypted and sent to the SIF 126, and the encrypted reception signal via the SIF 126 is decrypted.
Transmission and reception via the SDN network is performed by encrypted digital signals.

Accordingly, in the case of telephone communication, the audio signal from the handset was drawing omitted becomes a digital signal by CODEC123, for example one provided B ₁ serves as a channel signal to CRDCR127, the data signal of the data communication is PC 110 from via CMM130 given to STR125, after having become signals transformed by for example B ₂ channel to ISDN transmission rate, LA
In the PD 124, a D channel signal as user information is provided to the CRDCR 127, and these transmission signals are further transmitted to the CRDCR 127 by, for example, RAS.
It is encrypted by the encryption method and passed through the SIF 126 to the IS
Sent to the DN network.

[0009]

In this conventional ISDN terminal device, as shown in FIG. 4, a data signal from an LAPD 124 is encrypted by a CRDCR 127 to generate an SI signal.
F126 to the ISDN network, and the encrypted received signal from the ISDN network
It becomes configured to be transmitted to the decoded LAPD124 in RDCR127, encryption (e.g. RAS in cryptography) telephone communications, for example, communication by B ₁ channel one channel of is performed, RAS encryption If method has been found, when it is monitored by B ₁ channel, easily decrypted other than communicating party, there is a problem that security of communication contents are not maintained.

[0010]

[0011]

According to the present invention, there is provided an ISDN terminal apparatus comprising: a data terminal having a function of calling data communication; and an adapter for interfacing with the data terminal and an ISDN network. A driver / receiver for interfacing with the data terminal and transmitting / receiving data to / from the data terminal, a layer 1 / layer 2 circuit for interfacing with the ISDN network and transmitting / receiving the data to / from the ISDN network,
A memory for temporarily storing transmission / reception data;
A multi-protocol serial controller circuit for controlling a transmission procedure when transmitting and receiving the data to and from the N network;
A speed matching circuit for speed matching of data transmission to the DN network;
And I said I partitioned B ₁ channel and B ₂ channels of the network
A data signal distribution / integration circuit for integrating into one B-channel signal data received from the B ₁ channel and B ₂ channels SDN network by the detection of the synchronization signal, and a CPU for controlling the entire adapter.

[0012]

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. FIG. 2 shows an operation procedure of data transmission / reception to / from an ISDN network in this embodiment, and FIG. 1 (a) is a flowchart showing an operation procedure up to the start of data transmission. , (B) is a flowchart showing an operation procedure up to the start of data reception, and FIG. 3 is a diagram showing an example of a data signal distribution / integration format in the present embodiment.

In FIG. 1, the present embodiment shows an ISDN terminal adapter 1 connected between a data terminal 2 having a calling function for data communication and an ISDN network 3 including B ₁ , B ₂ and D channels and the data terminal 2. ISDN
The terminal adapter 1 interfaces with the data terminal 2 and transmits / receives data to / from the data terminal 2.
Interface with the receiver 15 and the ISDN 3
A layer 1 / layer 2 circuit 17 for transmitting / receiving data to / from the DN network 3, a memory 12 for temporarily storing transmitted / received data, and a multi-protocol serial for controlling a transmission procedure when transmitting / receiving data to / from the ISDN network 3 a controller circuit (hereinafter MPSC) 13, a rate matching circuit 14 that performs rate matching of the data transmission to the ISDN network 3, an ISDN network 3 in combination with the synchronization signal transmission data B ₁ channel and B
Data signals integrated into one B-channel signal data received from the distribution to and the ISDN network 3 B ₁ channel and B ₂ channels ₂ channels by the detection of the synchronizing signal distributing /
It has an integrated circuit 16 and a CPU 11 that controls the entire ISDN terminal adapter 1.

Next, the operation of this embodiment will be described with reference to FIGS.
This will be described with reference to FIG.

First, the case of data transmission will be described.

When data communication is performed, a call instruction from the data terminal 2 is transmitted through the driver / receiver 15 to the MPSC 1
3 is input to the layer 1 and the layer 2 by the CPU 11.
The circuit 17 makes a call to the ISDN 3. At this time, as shown in S11 of FIG. 2, B ₁ and channel call and B ₂ channel call are sequentially performed.

After the call is made, the CPU 11 monitors the response from the other party input from the ISDN 3 via the layer 1 / layer 2 circuit 17 to confirm whether the call has been established (S12, S12).
S13). This, S11, B ₁ channel as shown in S12, performs the B ₂ channel, respectively, to be established call both one or both channels, via Layer 1 Layer 2 circuit 17 by an instruction from the CPU 11, S18
As shown in ( ₁₎ , the call is disconnected on both the B ₁ and B ₂ channels. After the call establishment for both the B ₁ and B ₂ channels, the layer 1 / layer 2 circuit 17 monitors the establishment of the synchronization of both channels as shown in S14 and S15. In response to an instruction from the CPU 11, the call disconnection for both channels is performed as in S18 via the layer 1 / layer 2 circuit 17. After the synchronization of both the B ₁ and B ₂ channels has been established, the data signal distribution / integration circuit 16 transmits a distribution data synchronization establishment signal to the ISDN network 3 via the layer 1 / layer 2 circuit 17 as shown in S16.

[0019] This is used to measure the timing of the integration when the receiver receives the B ₁ channel data signal and B ₂ channel data signal, integrated into a single B channel data signals or velocity matching data signal . This synchronization establishment signal, for example, Figure 3 consecutive predetermined number of the flag signal is used as shown, B ₁ channel, is sent to the B ₂ channel both.

After transmitting the distribution data synchronization establishment signal, the data signal input from the data terminal 2 is matched to one B-channel data signal by the speed matching circuit 14 via the driver / receiver 15, and then the data signal is is distributed to the distribution / integration circuit 16, as shown in S17 B ₁ channel and the B ₂ channel, it is sent to the ISDN line via layer 1 layer 2 circuit 17.

Next, the operation on the receiving side when performing data communication will be described.

[0022] B ₁ channel from the ISDN network 3, B ₂ channels each incoming call (S21) of, when it is recognized by the CPU11 via Layer 1 Layer 2 circuit 17, B
_1, after returning a response to each B ₂ both channels, monitoring an acknowledgment to confirm whether the call has been established in each B _1, B ₂ both channels as shown in S22, S23. If the call is not established in one or both channels, the call is disconnected in the same manner as shown to the calling side (S28).

After the call is established on both the B ₁ and B ₂ channels, S2
4, S25 as shown in B _1, monitors a synchronization establishment of B ₂ both channels, one or, if established synchronization in both channels, performs call disconnection in the same manner as shown to the caller (S2
8). After synchronization is established, the monitor B ₁ channel input via the Layer 1 Layer 2 circuit 17, a B ₂ channel data by the data signal distribution / integration circuit 16, the distribution data synchronization establishment signal reception as shown to S26 after, B ₁ performs data integration timing B ₁ channel B ₂ channels of each data integration using the distribution data synchronization establishment signal,
Integrating B ₂ both channel data signal to one of the B channel data.

In addition, in order to realize bidirectional data communication, the receiving side has a function of transmitting a distribution data synchronization establishment signal, and the transmitting side has a function of receiving the distribution data synchronization establishment signal.

It should be noted that the data signal distribution /
In the integration, as shown in FIG.
This is a data signal that is speed-matched to a channel of 64 kbps. Here, one data signal divided every 8 bits is displayed. The rate matching the data signal 31, the data signal distribution / integration circuit 16 is bit allocation as B ₁ channel data signal 32 and B ₂ channel data signals 33, time integration, B ₁ channel data signal 32 and the B ₂ channel The data signal 33 is integrated into the speed matching data signal 31.

[0026]

As described above, the present invention provides a data terminal including a data communication calling function and an adapter for interfacing with the data terminal and an ISDN network.
In the SDN terminal device, the adapter is connected to the data terminal.
Interface that sends and receives data to and from data terminals.
I / O interface to driver / receiver and ISDN
Layer 1 / Layer for transmitting / receiving data to / from SDN network
2 circuits and a memory for temporarily storing transmission / reception data
And the transmission procedure control when transmitting / receiving data to / from the ISDN network.
Multi-protocol serial controller circuit to perform
Speed matching circuit for speed matching of data transmission to SDN network
And the transmission data in combination with the synchronization signal to
And the ISD partitioned B ₁ channel and B ₂ channels
Receive data from B ₁ channel and B ₂ channels N network
Into one B-channel signal by detecting synchronization signal
Data signal distribution / integration circuit and the entire adapter
By a control for CPU, with sealed anti <br/> information being transmitted from leaking easily to the other communication party to the ISDN network, it is possible to improve the confidentiality of conventionally data communication effect There is.

[Brief description of the drawings]

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

FIGS. 2A and 2B show an operation procedure for transmitting and receiving data to and from an ISDN network in the present embodiment, wherein FIG. 2A is a flowchart showing an operation procedure until data transmission starts, and FIG. 2B is a flowchart showing an operation procedure until data reception starts. is there.

FIG. 3 is a diagram illustrating an example of a data signal distribution / integration format according to the present embodiment.

FIG. 4 is a block diagram illustrating an example of a conventional ISDN terminal device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ISDN terminal adapter 2 Data terminal 3 ISDN network 11 CPU 12 Memory 13 Multiprotocol serial controller circuit (MPSC) 14 Speed matching circuit 15 Driver / receiver 16 Data signal distribution / integration circuit 17 Layer 1 / Layer 2 circuit

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04M 11/00-11/10 H04L 9/12 H04L 12/02 H04L 29/04 H04L 29/10

Claims (1)

(57) [Claims] A data terminal including a 1. A calling function of the data communication, the ISDN terminal device comprising an adapter to interface with the data terminal and the ISDN network, the
The adapter interfaces with the data terminal and
Driver / receiver that sends and receives data to data terminals
And the ISDN network interfacing with the ISDN network.
Layer 1 / Layer 2 transmitting / receiving the data to / from
Circuit, a memory for temporarily storing transmission and reception data, and
Controls the transmission procedure when transmitting and receiving the data to the ISDN network.
A multi-protocol serial controller circuit;
Speed matching circuit for speed matching of data transmission to ISDN network
And the ISD by combining the transmission data with the synchronization signal.
And the partitioned B ₁ channel and B ₂ channels N network
Received from B ₁ channel and B ₂ channels of the ISDN network
Data is converted into one B channel signal by detecting the synchronization signal.
Signal distribution / integration circuit for integrating into the adapter and the adapter
IS having a CPU for controlling the whole
DN terminal device.