JP3505550B2 - Line connection device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line connecting device provided in a terminal such as a telephone connected to a telephone line, and more particularly to a line connecting 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 terminals to an ISDN line. As shown in the figure, a DSU 2 (digital service unit) is provided in the existing two-line line ( digital line) 1. The DSU 2 is converted into a 4-wire digital line 3 so that a plurality of terminals 5 such as a telephone, a FAX, 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 on the exchange 6 side or the like. At present, up to two units can simultaneously communicate with one line.

FIG. 4 is a circuit diagram showing a connection configuration of the DSU 2 and the terminal 5. As shown, the ISDN line is line 1.
-U point-DSU2-T point-terminal 5 is connected. When the ISDN line is used by one terminal 5, the DSU 2 in the housing 5b of the terminal 5 as shown in FIG.
Also, the terminal circuit 5a is built in. The connection between the DSU 2 and the terminal circuit 5a is as shown in the drawing.
2. The driver / receiver 7 is provided in each of the four-wire circuit portions (positions corresponding to points T) of the terminal circuit 5a and is connected by the transformer 7a.

[0004]

However, the driver / receiver 7 provided in the DSU 2 and the terminal 5 has many parts and is expensive. Therefore, the DS of DSU2
It is conceivable that the U circuit 2a and the terminal circuit 5a of the terminal 5 are directly connected by four wires (a configuration excluding the driver / receiver 7), but in this case, signal transmission between the DSU 2 and the terminal circuit 5 is hindered. .

The terminal 5 is configured to be connected to the DSU 2 via a point T, and is designed on the assumption that the signal (digital pulse signal) from the DSU 2 is input with a delay of time t within a predetermined range. There is. Therefore, when the DSU circuit 2a and the terminal circuit 5a are simply connected, the signal from the DSU circuit 2a is directly input to the terminal circuit 5a at a very short distance,
Since there is no delay for the time t, the terminal circuit 5
On the a side, there arises a problem that the signal processing cannot be normally performed.

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 in close proximity to each other, the driver / receiver 7 is provided for each terminal. It was being done. The driver / receiver 7 is provided with a transformer 7a, and the waveform is deformed at the time of signal transmission in the transformer 7a portion, which causes the signal delay.

By the way, since a plurality of terminals 5 can be connected to the point T, even if the ISDN line is initially used by one terminal 5, it will be In some cases, additional terminals 5 after the first one may be added. At present, no configuration has been proposed in which an optimal 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 dedicated to this terminal circuit 5a. Since it becomes a circuit and the point T cannot be formed, it becomes impossible to increase the number of terminals 5 thereafter. In particular, since the cost of the DSU 2 is high in the ISDN line terminal, it is more costly to produce the dedicated DSU 2 and the versatility is lost.

The present invention has been made to solve the above problems, and when an ISDN line is used by one terminal, the entire circuit structure can be simply and inexpensively constructed, and a plurality of units can be used. It is an object of the present invention to provide a line connection device capable of flexibly coping with the connection of other terminals.

[0010]

In order to achieve the above-mentioned object, the line connecting device of the present invention, as set forth in claim 1, converts a two-line line laid with an exchange into a two-system four-line system. DSU circuit (2a) that outputs a digital communication signal
And the digital signal output from the DSU circuit at a predetermined time
Period (t) and delayed by a communication circuit configured to perform uptake communication processing (15a), provided between said DSU and communications circuitry, a clock supplied from the communication circuit
Based on the
A predetermined bit equivalent to (t) is shifted and delayed and output.
It has a shift circuit and is suitable for the timing of acquisition of the communication circuit.
And a compensating circuit (12) for enabling the compensation.

Further, as described in claim 2, the input line (16a) from the DSU circuit (2a), which is provided in the housing (15b) of the device, and the communication circuit (15).
The connector (14) to which the output line (16b) to a) is connected, and the compensation circuit (12) are mounted,
From the input line (13a) to the compensation circuit and the compensation circuit
Output line and (13b) and each single connector (10a) compensating substrate (10) derived in part, wherein the compensation board communication circuit and the DSU circuit by mounting the connectors of It may be configured to be interposed between them.

In addition, as described in claim 3, the DS
An input line (23a) connected to the U circuit (2a),
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 insulating the primary side and the secondary side so that they can communicate with each other, and an output end of the input line for the output. A connection line (23c) connected to the input end of the line, an extension connector (21) connected to the output end of the input line, and a connector to which the input end of the input line and the output end of the output line are connected. (20a)
By adding an extension board (20) consisting of and to the connector (14) of the apparatus, by mounting the connector (20a) of the extension board (20) instead of the compensation board (10), The DSU circuit includes the communication circuit (15
Connect a), further, may be expending possible configuration other communication circuit through the extension connector (21).

[0013] Further, as described in claim 4, the DSU
Circuit (2a), communication circuit (15a) and connector (1
4) it is built in the housing of the phone (15) (15b), each
Each of the above expansion boards is attached to the telephone connector (14).
Mounting, and add-on connector (21) connected between each other cables
By connecting at (22), these two units installed side by side
Communication circuit (15a) of each telephone (15-1, 15-2)
A DSU circuit provided in the one telephone (15-1)
(2a) can be connected .

A DSU circuit 2a is connected to the 2-line circuit 1 and converted into 4-line. A communication circuit 15a is connected to the DSU circuit 2a via a compensating circuit 12 to enable digital communication via an ISDN line. The compensating circuit 12 shifts the digital signal from the DSU circuit 2a by a predetermined bit by a shift circuit and delays and outputs it. Although the communication circuit 15a is configured to fetch the digital signal from the DSU circuit 2a with a delay of a predetermined time t, the compensating circuit 12 can normally fetch the digital signal. The compensating circuit 12 is mounted on the compensating substrate 10.
The connector 10a of the DSU circuit 2a and the communication circuit 15
It is detachable from the connector 14 connected to a.

[0015]

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

Further, a communication circuit 15a corresponding to the above-mentioned terminal circuit 5a and having various functions for communication is provided. Then, these DSU circuit 2a and communication circuit 1
The compensating circuit 12 is provided between the compensation circuit 12 and 5a. The compensation circuit 12 processes the digital signal output from the DSU circuit 2a into a state in which the communication circuit 15a can accept the digital signal.

That is, the DSU circuit 2a and the communication circuit 15a
Uses an existing circuit configuration. Therefore, the communication circuit 15a delays and takes in the digital signal output from the DSU circuit 2a by a time t within a predetermined range as described above.

Therefore, 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 shifting is performed by the 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 side. It should be noted that the input of 2CH only needs to have separate input / output ports, and 2CH with the above clock.
Can be composed of a single shift IC that operates in synchronization.

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

On the other hand, in the case 15b, the connector 14 is mounted on the 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 between the DSU circuit 2a and the connector 14, and an output line 16b is printed between the connector 14 and the communication circuit 15a. Among them, a signal line for the clock CLK 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 compensating circuit 12 between the DSU circuit 2a and the communication circuit 15a. 7 becomes unnecessary and the cost can be reduced. The compensating circuit 12 is mounted on the compensating substrate 10 and may be mounted on a single connector 14 provided in the housing 15b.

The compensating substrate 10 delays the 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 the mode in which the ISDN line 1 is used in the single telephone 15, the telephone 15 can be manufactured at low cost.

Next, a mode of adding the telephone 15 will be described. Another telephone 15 can be provided in one ISDN line. In this case, as shown in FIG. 2, two telephones having the same structure are a master 15-1 and a slave 15-2. Will be installed as

In this case, in the base unit 15-1 on the side connected to the line 1, the compensation board 10 attached is removed from the connector 14, and the extension board 20 shown in the figure is attached,
Similarly, the same extension board 20 is attached to the connector 14 also in the extension unit 15-2. Then, by simply connecting the extension connectors 21 of the extension boards 20 to each other with the connection cable 22, the two base units 15-1 and 15-2 can simultaneously talk on one line 1. Become.

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

The driver / receiver 7 is a transformer 7
The primary side and the secondary side of a can communicate with each other and are electrically insulated. By providing this 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 shape folded 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 led out to the connector 14, and the connector 20a of the extension board 20 is connected to the connector 14 to connect the DSU circuit 2a and the communication circuit 15a to the driver / receiver 7. Can be connected in the form of.

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

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

As described above, the extension of the cordless handset 15-2 can be performed only by mounting the extension board 20. At this time, on the base unit 15-1 side, the compensation board 10 mounted on the single connector 14 in the housing 15b can be removed and replaced with the extension board 20 to perform the DSU circuit 2a and the communication circuit. 1
There is no need to replace or reset 5a.

Also, in the slave unit 15-2, the connector 14
Since it suffices to similarly install the additional board 20 in the same manner, the work at the time of the installation can be made common to all other telephones without distinguishing between the parent device and the child device. Since work other than replacement, such as work for inputting various settings and switching switches, is not required, work inside the housing 15b by a construction worker who carries out additional work can be minimized, and erroneous work can be prevented. You will be able to improve efficiency.

It should be noted that 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 this input line 23a
Does not work. Therefore, the slave unit 15-2 may not have the DSU circuit 2a in advance. Similarly, the handset 15
The expansion board 20 may be mounted in advance at -2.

By the way, the expansion board 2 is added to the base unit 15-1.
By mounting 0, the point T can be formed in the extension connector 21 portion of the extension board 20. Therefore, at this T point, the extension connector 2
From the first part, a total of eight terminals 5 can be connected in the form of a bus connection. At present, simultaneous communication can be performed only up to two (two) of these, so it is not suitable for adding more than three telephones under the present circumstances, but at present, a combination of terminal devices other than telephones, for example, telephones It can be effectively used in the form of connecting multiple terminals such as FAX and personal computer.

The above-mentioned compensation board 10 and extension board 2
Reference 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 a card connector portion on the same plane as the substrate However, the device-side connector 14 may be configured to use a slot (socket) shape correspondingly.

[0035]

According to the present invention, since the compensating circuit delays and outputs the digital signal for a predetermined period and is adapted to the acquisition timing of the communication circuit, the communication circuit is connected to the DSU circuit through the compensating circuit. I can connect directly, I
When the SDN line is used in one communication circuit, the driver / receiver can be eliminated, and the cost can be reduced with a simple configuration. This compensation circuit has a simple configuration in which a shift circuit shifts and delays a digital signal. Then, the DSU circuit and the communication circuit are arranged in the housing of the device, these are connected to a single connector, and the connector of the compensation substrate on which the compensation circuit is mounted is made detachable, thereby the DSU circuit and the communication circuit. The compensation circuit and the compensation circuit can be individually arranged and can be maintained separately. In addition, the T point by the driver / receiver can be formed by mounting the extension board on the connector of the device, and the D point can be formed through this T point.
It becomes possible to easily add a plurality of other devices to the device in which the SU circuit and the communication circuit are incorporated. Especially when a telephone with the built-in device is installed side-by-side, it is possible to install it by installing the extension board on each connector and connecting the cables with the connection cable. It can be facilitated and erroneous work inside the device can be prevented. In this way, the commonization of the construction work at the time of the installation for a large number of telephones installed on the street significantly improves the reliability of the construction work.

[Brief description of 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 a state where the telephone is installed side by side.

FIG. 3 is a circuit diagram showing a connection configuration of terminals 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 substrate, 10a, 14, 20a ... Connector, 15 ... Telephone, 15-1 ... Parent machine, 15-2 ... Child machine, 15
a ... communication circuit, 15b ... case, 20 ... extension board, 21
... Additional connector, 22 connection cable, 22a, 22
b ... connector, 23a ... input line, 23b ... output line, 23c ... connection line.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Haruki Sekiguchi 5-10-10 Minamiazabu, Minato-ku, Tokyo Anritsu Co., Ltd. (72) Teruo Kuwahara 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo Date This telegraph telephone company (72) Inventor Takanori Nakajima 3-19-2 Nishishinjuku, Shinjuku-ku, Tokyo Japan Telegraph telephone company (72) Inventor Yu Mihori 2-3-2 Shimomeguro, Meguro-ku, Tokyo Incorporated company Tamura Electric Co., Ltd. (72) Inventor Yuji Sakurai 2-3 2-3 Shimomeguro, Meguro-ku, Tokyo Incorporated company Tamura Electric Co., Ltd. (72) Hidenori Miyake 2-chome, Shimomeguro, Meguro-ku, Tokyo No. 3 in Tamura Electric Co., Ltd. (56) Reference JP-A-2-309823 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04L 12 / 00-12 / 26 H04L 12/50-12/66 H04M 1/0 0 H04M 1/24-1/253 H04M 1/58-1/62 H04M 1/66-1/82 H04M 11/00-11/10

Claims (4)

(57) [Claims] 1. A D that converts a 2-wire line laid with an exchange into a 2-system 4-wire and outputs a digital communication signal.
Between the SU circuit (2a), a communication circuit (15a) configured to perform a communication process by delaying a digital signal output from the DSU circuit by a predetermined time (t), and between the DSU circuit and the communication circuit. And a shift circuit for delaying and outputting the input digital signal by a predetermined bit corresponding to the predetermined time (t) based on a clock supplied from the communication circuit. A line connection device comprising: a compensation circuit (12) adapted to the time. 2. 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 the compensation circuit (12) are mounted, and an input line (13a) to the compensation circuit and an output line (13) from the compensation circuit.
b) and a compensating board (10) each led to a single connector (10a) part, the compensating board being inserted between the DSU circuit and the communication circuit by mounting the connectors together. The line connection device according to claim 1, wherein the line connection device has the following configuration. 3. An input line (23a) connected to the DSU circuit (2a) and an output line (23) connected to the communication circuit (15a).
b) and provided on the input line and the output line respectively 1
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; Expansion board (2) comprising an expansion connector (21) connected to the output end of the line and a connector (20a) connected to the input end of the input line and the output end of the output line
0), the connector (14) of the device is replaced with the connector (2) of the expansion board (20) instead of the compensation board (10).
By mounting the 0a), wherein said the DSU circuit, connects the communication circuit (15a), further wherein the through Expansion connector (21) is a expending possible configuration other communications circuitry Item 2. The line connection device according to item 2. 4. The DSU circuit (2a) and the communication circuit (1)
5a) and the connector (14) are built into 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
Each telephone (15-1, 15-2) communication circuit (15
a) is a DSU provided in the one telephone (15-1)
The line connection device according to claim 3, which is configured to be connectable to the circuit (2a).