JPS58151765A - Digital telephone set - Google Patents

Abstract

PURPOSE:To attain the communication with a digital telephone set at a non-telephone terminal, by providing two switches and a communication circuit connecting the switches for each bus of high and low speed information channels of the digital telephone set. CONSTITUTION:The digital telephone set 10 is provided with a telephone input and output section 5 and a non-telephone telephone terminal interface 6, and in connecting the digital telephone set 7' to the interface 6, when an incoming call comes from an exchange station, a signal control section 9 rings the sounder of the telephone sets 7' and 10. When either of them is hooked off, channels among high speed information channel buses 3a-3c, low speed information channels 4a-4c and communicaton circuits 15, 16 are formed with the switching control of switches 11-14 for the call via a digital subscriber line 1. When either of the telephone sets 7', 10 is hooked off, the signal control section 9 controls the switches 11-14 to connect the subsriber line 1 to the corresponding telephone set.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a digital telephone capable of transmitting and receiving information other than voice. The present invention relates to a digital data filling machine which is capable of sustaining a terminal with a high pit rate such as a digital telephone, and also enables mutual communication with the digital telephone connected to the terminal.

Prior Art and Problems Generally, in digital communication networks, 64K
A high-speed information channel that has a transmission capacity of bit/pea and is used mainly for telephone communications; a low-speed information channel that has a smaller transmission capacity and is mainly used for non-telephone communications (for example, facsimile communication); A communication method is used in which signals are time-division multiplexed with signal channels used for transmitting control signals such as responses, and the signals are sent to each terminal device via a digital subscriber line.

FIG. 1 is a block diagram of a conventional digital 11-talk machine used in the above communication network, where 1 is a digital subscriber line and 2 is an assembly of transmission frames.

3 and 4 are high-speed and low-speed information channel paths, respectively; 5 is a codec circuit that performs 1DtD/A conversion, an analog output circuit that amplifies transmitting and receiving signals, and a dial. A telephone output section is provided with a signal circuit for controlling buttons, sounders, hook switches, dial input brakes, and sounders, 6 is a terminal interface section, 7 is a non-telephone terminal such as a facsimile, 8 is a signal path, 9 is a signal control section. same,
Although not shown in the drawings, the telephone output section 5 is connected to a transmitter and a receiver. Also, in the same figure,
Although paths 3.4 of the high-speed and low-speed information channels are each shown as one line, they actually each have two paths, an upstream path and a downstream path.

The high-speed information channel, low-speed information channel, and signal channel that are time-division multiplexed and sent via the digital subscriber m,1 are disassembled in the transmission frame assembly and disassembly section 2,
The high speed information channel is applied to the telephone output 5 via path 5 to 1! A low-speed information channel is applied to a non-telephone terminal 7 via a path 4 and a terminal interface unit 6 for non-telephone communication, and a signal channel is connected to a signal control unit 9 via a signal bus 8. added to. Here, in general, the transmission capacity of path 4 of the low-speed information channel is:
In order to simplify the configuration of the digital telephone and unify the telephone and non-telephone interfaces, it is configured to have the same transmission capacity as the high-speed information channel path.

The signal control unit to which the signal channel is added via the signal bus 8 analyzes the bit pattern of the signal channel and controls the telephone output unit 5 or the non-telephone terminal 7 based on the analysis result. A signal (for example, a sounder provided in the telephone output unit 5, a control signal instructing the start of operation of a non-telephone terminal, etc.) is transmitted to the telephone output unit 5 or the terminal via a path 8. Add it to the interface section 6.

Similarly, the terminal interface section 6 creates a transmission frame that combines the control signal from the signal control section 9 and the low-speed information channel signal sent via the path 4, and sends the non-telephone terminal 7 to the non-telephone terminal 7.
It is added to.

As explained above, conventional digital telephones transmit image information channels independently, such that high-speed information channels for telephone communications are transmitted via path 3, and low-speed information channels for non-telephone communications are transmitted via path 4. Therefore, there is a drawback that the terminal equipment connected to the terminal interface section 6 cannot use the high-speed information channel even though the transmission capacities of the paths 5 and 4 of the image information channel are equal.

OBJECTS OF THE INVENTION The present invention improves the above-mentioned drawbacks, and its purpose is to enable a digital telephone to be connected to the terminal interface section, and to connect the digital telephone connected to the terminal interface section and the digital telephone. There is a feature that allows you to make calls between devices. Examples will be explained in detail below.

Embodiment of the Invention FIG. 2 is a block diagram of an embodiment of the invention.
are digital telephones, 11.12 are path changeover switches provided between high-speed information channel paths 5a and 5b and between paths 5b and So, respectively; 13.14 are low-speed information channel paths 4a and 4b and 4b and 4b, respectively. The path changeover switches 15 and 16 provided between the two are communication circuits, and the same reference numerals as in FIG. 1 represent the same parts. Similarly, the digital telephone 7' may have the same configuration as the digital telephone shown in FIG. 1, or may have a configuration without the terminal interface section 6. Further, in the same figure, paths 3a to 5C and paths 48 to 4a are shown as one line, but in reality, there are two paths, an upper side and a lower side. Further, the communication circuit 15 connects the upper side of the path 3a and the lower side of the path 48, and the lower side of the lotus 5a and the upper side of the path 4h when both the path changeover switches 11 and 13 are connected to the b side. Also, when the path changeover switches 12 and 14 are both connected to the b side, the communication circuit 16 switches to the path 5.
It connects G and the top of path 4b, and connects path 3o and the bottom of path 4b. Furthermore, although the path changeover switches 11 to 14 are shown as mechanical switches in the same figure, they can of course be implemented using logic circuits or the like.

The path changeover switches 11 to 14 operate in conjunction with each other based on the control signal applied from the signal control unit 9 via the signal bus 8, and realize the following five states (a), (b), and el. It is.

(() All bus selector switches 11 to 14
A state in which the path connection form is the same as that of a conventional digital telephone.

(b) A state in which the path changeover switch 11.15 is connected to 6ilIII, and the high-speed information channel path 5α and the low-speed information channel path 4α are connected via the communication line 1615.

In this case, the path changeover switch 12. i4 is a side, h
It may be connected to any of llll.

(c) Path changeover switches 12 and 14 are connected to hIIllK, path changeover switch 15 is connected to aillK, high-speed information channel path 5G and low-speed information channel path 4α,
4 & are connected via the communication circuit 16.

In the same case, the path changeover switch 11 is cLIIll,
It may be connected to either side of b.

The path connection form realized by the above (b) is path 3
A and the path 4g are connected via the communication circuit 15, and as mentioned above, the communication circuit 15 connects the upper side of the path 3g and the lower side of the path 4α, the downlink of the path 5a, and the upper side of the path 4G. Therefore, the digital telephone $1 connected to the digital telephone 11- and the terminal interface section 6
7' becomes possible. In addition, the path connection form realized by the above G-IK is a 5m path.
and the path 46.4g are connected via the communication circuit 16.The communication circuit 16 connects the path 3a and the path 46.4g through the communication circuit 16, as described above. Since it connects the Ig and the lower part of the path 460, it is connected to the terminal interface section 6 and enables the use of high-speed information channels for terminal equipment that could conventionally only use low-speed information channels. Therefore, 1. It is possible to use the digital telephone 7' to make calls to and from the exchange.

Next, the specific operation of the digital telephone 9 will be explained.

When a call is received from the exchange, the signal control section 9 makes the sounders of the digital telephones 7' and 10 ring, and when one of the digital telephones 7' and 10 goes off-hook to answer,
Instruct the other to disconnect, stop the ringtone, and depending on which digital phone went off-hook,
A control signal for controlling the connection form of the path as follows is applied to the path changeover switches 11 to 14. That is, when the digital telephone 7' goes off-hook, the path connection form is set to the state e→ as described above, and a path is formed between the digital telephone &7 and the digital subscriber line 1, and when the digital telephone 10 goes off-hook. In this case, the path connection form is set to the state B) described above, and a path is formed between the telephone output section 5 and the digital subscriber line 1.

Thereafter, signals are exchanged through synchronization establishing means with the exchange, and a communication state is reached.

Now, for example, if the digital telephone 10 responds to an incoming call, but the incoming call is to the digital telephone 7', the subscriber must press the operation button provided on the caller output section 5 of the digital telephone 10. (not shown), and when the signal control section 9 detects that the operation button has been pressed, it makes the sounder of the digital telephone 7' ring. When it is detected that the digital telephone 7' goes off-hook for a response, the signal control section 9 sends a control signal to change the path connection form to the above-mentioned state -) to the path changeover switches 11 to 1.
4, a path is formed between the telephone output section 5 and the digital filling machine 7. And digital electricity! The subscriber of the l-root 10 talks to the subscriber of the digital telephone 7', and when notified of the incoming call to the digital telephone 7', the subscriber goes on-hook. When detecting that the digital telephone 10 is on-hook, the signal control section 9 applies a control signal to the path changeover switches 11 to 14 to change the path connection form to the above-mentioned state (c), and connects the digital telephone 7' and the digital subscriber line. A path is formed between the digital telephone set 10 and the switching center, and thereby a call is made between the digital telephone set 10 and the exchange office.

In addition, when the digital telephones 7' and 10 make a call,
The signal control section 9 adds a control signal to the path changeover switches 11 to 14 depending on which one has gone off-hook to make a call. That is, when it is detected that the digital telephone 7' goes off-hook to make a call, the path connection type is determined as described above and whether it is in good condition? A current control signal is applied to the path changeover switches 11 to 14 to form a path between the digital telephone 7' and the digital subscriber line 1, and when it is detected that the digital telephone 10 goes off-hook, the signal The control unit 9 is configured so that the path connection form is in the above-mentioned state.
A path is formed between the telephone output unit 5 and the digital subscriber line 1 by applying a control signal such that the following is applied to the path changeover switches 11 to 14. Thereafter, signals are exchanged through synchronization establishing means with the exchange, and a communication state is reached.

In this way, the digital telephone 10 of this embodiment has the digital telephone 7' connected to the terminal interface section 6, and mutual calls between the digital telephones 7' and 10 and calls with the switching office using the digital telephone @&7' are possible. possible,
Furthermore, the two digital telephones 7', 100 can maintain confidentiality.

The above explanation is based on the case where nine path changeover switches are provided for each path of the high-speed and low-speed information channels, but as shown in FIG.
, between 5a' and 36', between path 3M' and 5a',
A path changeover switch 12 is installed between the paths 5d' and 5a'.
'.

11', 13', and a path changeover switch 11',
By providing a communication circuit 15 between 13' and 13', two digital telephones 7',
10 and each digital telephone 7', 1
0 and the station can be made.

1iIJ, the same reference numerals as in the other FIG. 1 represent the same parts.

DETAILED DESCRIPTION OF THE INVENTION As described above, the present invention provides a first . a second path changeover switch (path changeover switches 11 and 12 in the embodiment), fifth and fourth path changeover switches (path changeover switches 11 and 12 in the embodiment) provided on the path of the low-speed information channel; 13.14
), 1st. Between the third path changeover switch and the second path changeover switch.
The first path changeover switch is provided between the fourth path changeover switch. Second communication circuit (communication circuit 15.16 in the embodiment)
, and a control means (signal control unit 9 in the embodiment) for controlling the path changeover switch.
It is now possible to connect the low-speed information channel path and the high-speed information channel path to each other, and conventionally only low-speed non-telephone terminals can be connected, and digital telephones can also be connected to the nine-terminal interface. In addition to being able to make calls between two digital phones,
It has the advantage that it can be used as a branch telephone with a confidential function that allows two digital telephones to alternately switch between high-speed information channels.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional example, FIG. 2 is a block diagram of one embodiment of the present invention, and FIG. 3 is a block diagram of another embodiment of the present invention. 1 is a digital subscriber line, 2 is a transmission frame assembly/disassembly circuit, 3.3a to 5e, 5a' to 3-' are high speed information channel paths, 4.4α to 4C are low speed information channel nodes, and 5 is a transmission frame assembly/disassembly circuit. 10.7: Telephone output unit; 6, terminal interface unit; 7, non-telephone terminal; 8, signal path; 9, signal control unit; 10.7
' is a digital telephone, 11 to 14, 11' to 16' are path changeover switches, and 15 and 16 are communication circuits. Patent applicant Nippon Telegraph and Telephone Public Corporation agent Patent attorney Gobe Tamamushi (3 others) Ml [F] 31F! 3 diagram

Claims (1)

[Claims] A high-speed information channel, a low-speed information channel, and a signal channel are connected to a digital subscriber line on which time-division multiplex transmission is performed, and the high-speed information channel, the low-speed information channel, and the signal channel each have a path, and the high-speed information channel In a digital telephone that primarily performs telephone communication and primarily performs non-% #ti communication using a low-speed information channel, a first and second path provided on the path of the high-speed +'PI information channel. a changeover switch, and a third. a fourth path changeover switch; and the first path changeover switch. A fifth path changeover switch is provided between the uplink path of the high speed information channel and the lower end of the low speed information channel path, and the lower end of the high speed information channel path and the uplink path of the low speed information channel. a first communication circuit for connecting the second . Fourth
between the upper side of the high-speed information channel path and the upper side of the low-speed information channel path, and between the lower side of the high-speed information channel path and the lower side of the low-speed information channel path. a second communication circuit connecting said first . It controls whether the sixth path changeover switch is connected to the path side or the first communication circuit side, and also controls whether the sixth path changeover switch is connected to the path side or the first communication circuit side. A digital telephone set comprising: control means for controlling whether a fourth path changeover switch is connected to the path side or to the second communication circuit side.