JPH10112763A - Line connecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and inexpensively make an entire line structure when an ISDN line is used by one terminal and also to flexibly cope with connecting several terminals. SOLUTION: A two-wire line 1 is transformed into a four-wire via a DSU (digital service unit) circuit 2a. A communication circuit 15a fetches a digital signal from the circuit 2a with a prescribed time delayed. A compensation circuit 12 is provided between the circuits 2a and 15a, bits are shifted and the prescribed time is delayed. The circuit 12 is mounted on a compensation substrate 10, and a connector 10a is freely attachable and detachable to/from a connector 14 in a device 15. When this device is extended, a connector 20a of an extension substrate 20 is attached to the connector 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line connection device provided in a terminal such as a telephone connected to a telephone line, and more particularly to a line connection device for connecting a terminal to an ISDN line.

[0002]

2. Description of the Related Art FIG. 3 is a diagram showing a connection configuration of a terminal to an ISDN line. As shown in the figure, a DSU 2 (Digital Service Unit) is provided on an existing two-line line (analog line) 1. The DSU 2 is converted into a four-line digital line 3 so that a plurality of terminals 5 such as a telephone, a facsimile, and a personal computer can be connected, and the transmission speed on the line can be increased. The line 1 to the exchange 6 is switched and used as a digital line by switching the connection of the exchange 6 or the like. At present, up to two units can communicate simultaneously with one line.

FIG. 4 is a circuit diagram showing a connection configuration between the DSU 2 and the terminal 5. As shown, the ISDN line is line 1
To U point to DSU 2 to T point to terminal 5. When the ISDN line is used by one terminal 5, as shown in FIG.
And a terminal circuit 5a. The connection between the DSU 2 and the terminal circuit 5a is as shown in FIG.
2. A configuration in which a driver / receiver 7 is provided at a 4-wire circuit portion (a position corresponding to a point T) of each of the terminal circuits 5a and connected by a transformer 7a.

[0004]

However, the DSU 2 and the driver / receiver 7 provided in the terminal 5 have many parts and are expensive. Therefore, the DS of DSU2
It is conceivable to directly connect the U circuit 2a and the terminal circuit 5a of the terminal 5 with four wires (the configuration excluding the driver / receiver 7), but in this case, there is a problem in signal transmission between the DSU 2 and the terminal circuit 5. .

[0005] The terminal 5 is connected to the DSU 2 via a point T, and is designed on the assumption that a signal (digital pulse signal) from the DSU 2 is input with a delay of a predetermined range of time t. I have. Therefore, when the DSU circuit 2a is simply connected to the terminal circuit 5a, a signal from the DSU circuit 2a is directly input to the terminal circuit 5a at an extremely short distance,
Since there is no delay of the time t, the terminal circuit 5
On the side a, there is a problem that signal processing cannot be performed normally.

As described above, conventionally, when the ISDN line is used by one terminal 5, even if the DSU 2 and the terminal 5 are arranged at a short distance, the driver / receiver 7 is provided for each. Had been. The driver / receiver 7 is provided with a transformer 7a, and the waveform is deformed at the time of signal transmission at the transformer 7a, which causes the signal delay.

By the way, since a plurality of terminals 5 can be connected to the T point, even if the configuration is such that one terminal 5 initially uses the ISDN line, it is necessary to connect the ISDN line to two terminals later. In some cases, additional terminals 5 may be added. At present, no configuration has been proposed in which the optimum circuit configuration can be appropriately selected before and after the number of terminals 5 is changed.

According to another method, the circuit configurations of the DSU circuit 2a and the terminal circuit 5a may be changed so that the DSU 2 and the terminal 5 can be directly connected. In this case, the DSU 2 is exclusively used for the terminal circuit 5a. The circuit becomes a circuit and cannot form a T point, so that the number of terminals 5 cannot be increased thereafter. In particular, since the cost of the DSU 2 is large in the terminal of the ISDN line, the production of the dedicated DSU 2 becomes more expensive, and the versatility is lost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. When an ISDN line is used by one terminal, the entire circuit configuration can be simply and inexpensively constructed. It is an object of the present invention to provide a line connection device that can flexibly cope with connection of terminals.

[0010]

According to a first aspect of the present invention, there is provided a line connecting apparatus for converting a two-line line laid between an exchange into a two-system four-line system. And a DSU circuit for outputting a digital communication signal (2a)
A communication circuit (15a) configured to take in a digital signal output by the DSU circuit with a delay of a predetermined time (t) and perform communication processing; and a DSU circuit provided between the DSU circuit and the communication circuit. A compensation circuit (12) for delaying the digital signal output from the circuit by the time (t) and outputting the delayed signal to the communication circuit.

According to a second aspect of the present invention, the compensation circuit (12) converts the input digital signal into a predetermined bit corresponding to the predetermined time (t) based on a clock supplied from the communication circuit. A configuration may be adopted in which a shift circuit that shifts and outputs a delay is provided, and the shift circuit is adapted to take in the communication circuit.

According to a third aspect of the present invention, an input line (16a) from the DSU circuit (2a) is provided in a housing (15b) of the apparatus, and the communication circuit (15a).
A connector (14) to which an output line (16b) is connected, and the compensation circuit (12) are mounted, and an input line (13a) and an output line (13) to the compensation circuit are provided.
b) each having a single connector (10a) and a compensating board (10) led out to a single connector (10a), wherein the compensating board is inserted between the DSU circuit and the communication circuit by mounting the connectors. It may be configured.

[0013] According to a fourth aspect of the present invention, the DSU
An input line (23a) connected to the circuit (2a) and an output line (23) connected to the communication circuit (15a).
b) a driver / receiver (7) provided on the input line and the output line, respectively, for electrically isolating the primary side and the secondary side so that they can communicate with each other; and connecting the output end of the input line to the output. A connection line (23c) connected to the input end of the line, an additional connector (21) connected to the output end of the input line, and a connector connected to the input end of the input line and the output end of the output line (20a)
And a connector (20a) of the extension board (20) is attached to the connector (14) of the device, whereby the communication circuit ( 15a) and a plurality of other communication circuits may be added via the additional connector (21).

[0014] According to a fifth aspect of the present invention, the DSU
Circuit (2a), communication circuit (15a) and connector (1
4) is built in the housing (15b) of the telephone (15), the extension board is mounted on the connector (14) of each telephone, and the extension connectors (21) are connected to each other by the connection cable (22). By doing so, the communication circuit (15a) of each of these two telephones (15-1, 15-2)
Can be connected to the DSU circuit (2a) provided in the one telephone set (15-1).

A DSU circuit 2a is connected to the two-line circuit 1 and converted into four lines. A communication circuit 15a is connected to the DSU circuit 2a via the compensation circuit 12, and digital communication can be performed through an ISDN line. The compensating circuit 12 delays the digital signal from the DSU circuit 2a by a predetermined bit by a shift circuit and outputs the digital signal with a delay. Although the communication circuit 15a is configured to take in the digital signal from the DSU circuit 2a with a delay of a predetermined time t, the compensating circuit 12 can normally take in the digital signal. The compensating circuit 12 is mounted on the compensating substrate 10.
Of the DSU circuit 2a and the communication circuit 15
The connector 14 is detachable from the connector 14 connected to a.

[0016]

FIG. 1 is a diagram showing a line connection device of the present invention. In the present embodiment, a terminal connected to line 1 will be described as telephone 15. The above-mentioned DSU circuit 2a is provided in a housing 15b of the telephone 15,
Converts 2-wire line 1 to 4-wire.

A communication circuit 15a corresponding to the above-described terminal circuit 5a and having various functions for a call is provided. The DSU circuit 2a and the communication circuit 1
5a, a compensation circuit 12 is provided. The compensation circuit 12 processes the digital signal output from the DSU circuit 2a so that the digital signal can be accepted by the communication circuit 15a.

That is, the DSU circuit 2a and the communication circuit 15a
Uses an existing circuit configuration. Therefore, the communication circuit 15a takes in the digital signal output from the DSU circuit 2a with a delay of a predetermined range of timing t as described above.

For this reason, the compensating circuit 12 includes the DSU circuit 2
Each bit of the digital signal output from a is delayed by the time t and output to the communication circuit 15a. Specifically, bit shift is performed by a shift circuit. The number of shifts and the timing are determined based on the fetch timing of the communication circuit 15a and the clock (CLK) supplied from the communication circuit 15a. The input of 2CH only needs to have separate input / output ports.
Can be constituted by a single shift IC that operates synchronously.

The compensation circuit 12 is mounted on the compensation board 10. On the compensation substrate 10, a digital signal input line 13a and an output line 13b for the compensation circuit 12 are formed by printed wiring. The input line 13a includes a line for the clock CLK. Each of the 2CHs of the input / output lines 13a and 13b is led to a single connector 10a.

On the other hand, a connector 14 is mounted on a board 16 on which the DSU circuit 2a and the communication circuit 15a are mounted.
Is provided, and the connector 10a is detachable.
On this board 16, an input line 16a is printed and wired between the DSU circuit 2a and the connector 14, and an output line 16b is printed and wired between the connector 14 and the communication circuit 15a. The signal line for the clock CLK to be supplied to the compensation circuit 12 is also formed on the output line 16b.

As described above, the communication circuit 15a can be directly connected to the DSU circuit 2a only by providing the compensation circuit 12 between the DSU circuit 2a and the communication circuit 15a. 7 is unnecessary and can be configured at low cost. The compensating circuit 12 is mounted on the compensating substrate 10 and only needs to be mounted on a single connector 14 provided in the housing 15b.

The compensation board 10 delays a digital signal transmitted between the DSU circuit 2a and the communication circuit 15a, and it is not necessary to change the settings of these circuits 2a and 15a. As described above, in a mode in which the ISDN line 1 is used by a single telephone set 15, the telephone set 15 can be manufactured at low cost.

Next, an embodiment in which the telephone 15 is added will be described. Another telephone 15 can be provided on one ISDN line. In this case, as shown in FIG. 2, two telephones having the same configuration are provided as a master unit 15-1 and a slave unit 15-2. It will be attached as.

In this case, in the master unit 15-1 on the side connected to the line 1, the mounted compensation board 10 is removed from the connector 14, and the additional board 20 shown in the figure is attached.
Similarly, a similar extension board 20 is attached to the connector 14 of the slave unit 15-2 on the extension side. By simply connecting the extension connectors 21 of the extension board 20 to each other with the connection cable 22, the two master units 15-1 and the slave units 15-2 can communicate simultaneously on one line 1. Become.

The extension board 20 will be described below. On the additional board 20, an input line 23a and an output line 23b are respectively arranged in parallel from the connector 20a by printed wiring, and a driver / receiver 7 and a transformer 7a are respectively connected and arranged.

The driver / receiver 7 includes a transformer 7
The primary side and the secondary side of “a” can communicate with each other and are electrically insulated. By providing the driver / receiver 7, a point T is formed, and a plurality of terminals 5 (slave units 15-2 in this example) can be connected to the DSU circuit 2a while being insulated from each other. Output line 2
3b is formed in a form folded back by a connection line 23c connected to the secondary side of the transformer 7a of the input line 23a.

That is, the input line 1 from the DSU circuit 2a
6a and the output line 16b of the communication circuit 15a are respectively led out to the connector 14, and by connecting the connector 20a of the extension board 20 to the connector 14, the DSU circuit 2a and the communication circuit 15a are connected to the driver / receiver 7a. Can be connected via the.

The secondary side of the transformer 7a of the input line 23a is connected to the additional connector 21. A connector 22a at one end of the connection cable 22 is connected to the additional connector 21 and is led out to the slave unit 15-2.

In the slave unit 15-2, the connector 22b at the other end of the connection cable 22 is connected to the extension connector 21 of the extension board 20. Thereby, this connector 22b
From the connection line 23c, the transformer 7a and the driver / receiver 7 on the output line 23b to the connectors 20a, 14
A connection circuit is formed to reach the communication circuit 15a through the output line 16b. As a result, the communication circuit 15a of the slave unit 15-2 is connected to the line 1, and simultaneous communication on the slave unit 15-2 side becomes possible.

As described above, the extension of the slave unit 15-2 can be performed only by mounting the extension board 20. At this time, the master unit 15-1 can perform the work of simply removing the compensation board 10 attached to the single connector 14 in the housing 15b and replacing it with the extension board 20, and the DSU circuit 2a and the communication circuit 1
There is no need to replace or reset 5a.

In the slave unit 15-2, the connector 14
In this case, the work of simply mounting the extension board 20 in the same manner may be performed, so that the work at the time of co-installation in all the other telephones can be made common without distinction between the master unit and the slave unit. Since work other than replacement, such as input of various settings and switching of switches, is not required, work inside the housing 15b by the construction worker performing the extension work can be reduced to a minimum number of man-hours, and erroneous work can be prevented. The efficiency can be improved.

The driver / receiver 7 on the input line 23a of the extension board 20 provided in the slave unit 15-2.
And the DSU circuit 2a connected to the input line 23a.
Does not work. Therefore, the slave unit 15-2 may not be provided with the DSU circuit 2a in advance. Similarly, the child device 15
The extension board 20 may be previously mounted on -2.

By the way, the expansion board 2 is attached to the base unit 15-1.
By attaching 0, a point T can be formed in the additional connector 21 portion of the additional board 20. Therefore, at the point T, the additional connector 2
From one part, up to a total of eight terminals 5 can be connected in the form of a bus connection. At the present, simultaneous communication can only be performed up to two (two) at the same time, so it is not suitable for the addition of three or more telephones at present, but even at present, a combination of terminal devices other than telephones, for example, telephones In a mode in which a plurality of terminals such as a FAX and a personal computer are connected, it can be effectively used.

The above-described compensation substrate 10 and the extension substrate 2
Numeral 0 denotes a single card-shaped substrate, and the ends of the wiring patterns of the input lines 13a and 23a and the output lines 13b and 23b are formed on these substrates 10 and 20 up to the card connector portion on the same plane as the substrate. However, correspondingly, the connector 14 on the device side may be configured to use a slot (socket) shape.

[0036]

According to the present invention, since the compensating circuit has a configuration in which the digital signal is delayed and output for a predetermined period and is adapted to the timing of taking in the communication circuit, the communication circuit is connected to the DSU circuit via the compensating circuit. Now you can connect directly,
When the SDN line is used in one communication circuit, a driver / receiver is not required, and the cost can be reduced with a simple configuration. This compensation circuit has a simple configuration in which a digital signal is shifted and delayed by a shift circuit. The DSU circuit and the communication circuit are arranged in the housing of the device, and these are connected to a single connector, and the connector of the compensation board on which the compensation circuit is mounted is detachably configured. The compensation circuit and the compensation circuit can be individually arranged, and can be maintained for each part. Further, by attaching an additional board to the connector of the apparatus, a T point by the driver / receiver can be formed.
A plurality of other devices can be easily added to the device in which the SU circuit and the communication circuit are built. In particular, when a telephone with a built-in device is installed, it is possible to install the telephone by installing the extension board on each connector and performing the common work of connecting with a connection cable with the telephone of the same configuration to be installed. It can be simplified and erroneous work inside the device can be prevented. In this way, the common use of construction work when installing a large number of telephones on the street greatly improves the reliability of the construction work.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an example in which a line connection device of the present invention is applied to a telephone.

FIG. 2 is a circuit diagram showing an attached state of the telephone.

FIG. 3 is a circuit diagram showing a connection configuration of a terminal to an ISDN line.

FIG. 4 is a circuit diagram showing an internal configuration of a terminal.

[Explanation of symbols]

1 ... line, 2 ... DSU, 2a ... DSU circuit, 5 ... terminal,
5a terminal circuit, 7: driver / receiver, 7a: transformer, 10: compensation board, 10a, 14, 20a: connector, 15: telephone, 15-1: master unit, 15-2: slave unit, 15
a: communication circuit, 15b: housing, 20: extension board, 21
... Expansion connector, 22 connection cable, 22a, 22
b ... connector, 23a ... input line, 23b ... output line, 23c ... connection line.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Sachi Takasugi 5- 10-27 Minamiazabu, Minato-ku, Tokyo Anritsu Corporation (72) Inventor Haruki Sekiguchi 5- 10-27 Minamiazabu, Minato-ku, Tokyo Anritsu Inside (72) Inventor Teruo Kuwahara Nippon Telegraph and Telephone Corporation 3-9-1-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Takanori Nakajima 3-2-1-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Co., Ltd. (72) Inventor Yu Mihori 2-3-2 Shimomeguro, Meguro-ku, Tokyo Inside Tamura Electric Works, Ltd. (72) Inventor Yuji Sakurai 2-3-2 Shimomeguro, Meguro-ku, Tokyo Tamura Corporation Inside Electric Works (72) Inventor Hidenori Miyake 2-3-2 Shimomeguro, Meguro-ku, Tokyo Inside Tamura Electric Works

Claims (5)

[Claims] 1. A D-line for converting a two-line circuit laid between an exchange and a two-system four-line circuit and outputting a digital communication signal.
A SU circuit (2a), a communication circuit (15a) configured to take in a digital signal output from the DSU circuit with a delay of a predetermined time (t) and perform a communication process, and a communication circuit between the DSU circuit and the communication circuit. A compensating circuit (12) that delays the digital signal output from the DSU circuit by the time (t) and outputs the digital signal to the communication circuit;
A line connection device comprising: 2. A shift circuit for delaying an input digital signal by a predetermined bit corresponding to the predetermined time (t) based on a clock supplied from the communication circuit, and outputting the delayed digital signal based on a clock supplied from the communication circuit. 2. The line connection device according to claim 1, wherein said line connection device has a configuration adapted to a timing of taking in said communication circuit. 3. An input line (16a) from the DSU circuit (2a) and an output line (16b) to the communication circuit (15a) are provided in a housing (15b) of the device. A connector (14), and a compensating circuit (12), and an input line (13a) and an output line (13b) to the compensating circuit are respectively led out to a single connector (10a). 10. The line connection device according to claim 1, further comprising: (10) wherein the compensation board is inserted between the DSU circuit and the communication circuit by mounting the connectors. 4. An input line (23a) connected to the DSU circuit (2a) and an output line (23) connected to the communication circuit (15a).
b), provided on the input line and the output line, respectively.
A driver / receiver (7) for electrically insulating the secondary side and the secondary side so that they can communicate with each other; a connection line (23c) for connecting an output end of the input line to an input end of the output line; An extension board (2) comprising an extension connector (21) connected to an output end of a line, and a connector (20a) connected to an input end of the input line and an output end of the output line.
0), and the extension board (2) is connected to the connector (14) of the device.
By attaching the connector (20a) of (0), a plurality of other communication circuits can be added to the DSU circuit via the communication circuit (15a) and the additional connector (21). The line connection device according to claim 3. 5. The DSU circuit (2a), a communication circuit (1)
5a) and a connector (14) are built in the housing (15b) of the telephone (15), the extension board is mounted on the connector (14) of each telephone, and a connection cable is provided between the extension connectors (21). By connecting at (22), these 2
Communication circuits (15-1 and 15-2)
a) the DSU provided in the one telephone set (15-1)
The line connection device according to claim 4, wherein the line connection device is configured to be connectable to the circuit (2a).