JPH0993629A - Signal wiring system for communication channel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a signal wiring system of a communication channel in which a star wiring mode is adopted for an ISDN terminal equipment and the ISDN terminal equipment and a subscriber terminal equipment are wired on a same route. SOLUTION: After receiving a signal from an ISD network by a 1st receiver 4a, the signal is sent to plural ISD terminal equipments connected in parallel with plural 1st drivers 4b. After plural 2nd receivers 4c receive signals from the plural ISDN terminal equipments respectively and OR circuits 12a, 12b set them altogether logically and a 2nd driver 4d sends the result to the ISD network.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal wiring system for digital communication lines such as integrated service digital network (ISDN) lines.

[0002]

2. Description of the Related Art Generally, subscriber terminals (analog terminals) such as analog telephones, G3FAX and modems and ISDN terminals (digital terminals) such as digital telephones, G4FAX and data communication equipment are connected to an ISDN network via a digital exchange. To be done. For example, in the ISDN line INS Net 64 that is provided by NTT, as shown in FIG.
As shown in, an outlet 1 to which an ISDN terminal is connected
Is wired in a bus type to the digital exchange 2a for reasons such as electrical characteristics, and the outlet 3 to which the subscriber terminal is connected carries out extension communication between the terminals. Therefore, the digital exchange 2a is star-shaped. The one wired to
For example, it is disclosed in Japanese Patent Application No. 6-280522.

[0003]

However, the present inventor has found that the above-described conventional signal wiring system has the following problems. That is, ISD
The N terminal has a bus type wiring, but the subscriber terminal has a star type wiring with respect to the digital exchange 2a because it performs extension communication between the terminals. Therefore, the subscriber terminal and I
The SDN terminal and the SDN terminal must be routed separately, which reduces workability during construction.

The object of the present invention is to solve the above-mentioned problems.
An object of the present invention is to provide a signal wiring system for a communication line in which the ISDN terminal is in a star type wiring form and the ISDN terminal and the subscriber terminal can be wired in the same route. The above and other objects and novel features of the present invention will be apparent from the description of the present specification and the accompanying drawings.

[0005]

The outline of the invention disclosed in the present application will be briefly described as follows.
The signal wiring system of the communication line of the present invention is a signal wiring system of a communication line in which a subscriber terminal, an ISDN terminal and an ISDN network are connected via a digital exchange.
A plurality of ISDs connected in parallel by a plurality of first drivers after receiving a signal from the N network by a first receiver
O after transmitting to each of the N terminals and receiving the signals from the plurality of ISDN terminals by the plurality of second receivers respectively,
The R circuit logically makes one and the second driver IS
It is to be transmitted to the DN network.

According to the above-mentioned means, the received signal from the ISDN network is transmitted by the plurality of first drivers to the plurality of ISs.
The signals transmitted to the respective DN terminals are individually transmitted, and the transmission signals from the plurality of ISDN terminals are respectively received by the plurality of second receivers, then logically made one by the OR circuit and transmitted to the ISDN network by the second driver. ISDN
The terminals are wired in a star shape.

[0007]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described in detail below with reference to the drawings. 1 is a block diagram of a digital exchange according to one embodiment of the present invention, FIG. 2 is a circuit diagram of a driver / receiver according to one embodiment of the present invention, and FIG. 3 is a digital diagram of one embodiment of the present invention. FIG. 4 is a waveform diagram of output signals of each part of the exchange, and FIG. 4 is a wiring diagram of an extension terminal according to a signal wiring system of a communication line according to an embodiment of the present invention. Further, in all the drawings for explaining the conventional example and the embodiment, those having the same function are designated by the same reference numeral, and the repeated description thereof will be omitted.

In FIG. 1, a digital exchange 2b connects a subscriber terminal, for example, a subscriber telephone to an ISDN network, and enables extension / communication between the driver / receiver 4 and the subscriber telephone. The analog circuit switching unit 5 and the terminal adapter unit 6 are generally configured. The driver of the driver / receiver 4 separates the ternary AMI code, which is the data transmission code of the ISDN network, into positive sign and negative sign pulses so as to be processed by a microprocessor or the like, and performs voltage conversion. The reverse conversion is performed.

The outside line (station) and the ISDN terminal are connected via a driver / receiver 4, and the outside line and the subscriber's telephone are connected via a terminal adapter section 6 and an analog circuit switching section 5. Terminal adapter part 6
Is a layer 1 controller 7 and codecs 8 and 8
And an HDLC controller 9 and a CPU 10.

The layer 1 controller 7 has a transmission function of the first layer (physical layer) in accordance with the ISDN communication protocol, and provides information on the connection between the information channel (B channel) 2 line for transmitting voice data of a call and the call. The control channel (D channel) to be transmitted is multiplexed and separated.
Since the HDLC controller 9 performs the processing of the second layer (data link layer) according to the ISDN communication protocol by the CPU 10, it carries out the processing of the HDLC procedure which is the basic communication procedure thereof.

The CPU 10 includes a second layer (data link layer) and a third layer (network layer) according to the ISDN communication protocol.
Communication processing is performed to control the analog line switching unit 5. The codecs 8 and 8 are provided with voice information of the information channel (B channel) as a digital signal, and perform decoding (conversion into analog signal) processing so that voice can be output from the connected subscriber telephone. Also, the analog voice input from the subscriber telephone is encoded (converted into a digital signal).

The analog circuit switching section 5 selects voice data on two information channels (B channels) to connect to any subscriber telephone, and performs conversion operations such as extension communication and transfer between subscriber telephones. Do. It also sends a ringing signal to the subscriber's telephone and monitors the response of the subscriber's telephone. When an incoming signal is sent from an outside line (station), the signal is sent to the ISDN terminal via the driver / receiver 4, and at the same time, sent to the layer 1 controller 7. Control channel (D channel) with layer 1 controller 7
And the information channel (B channel) signal are separated, and the control channel information containing the information about the incoming call is HD.
It is sent to the CPU 10 via the LC controller 9.

The CPU 10 processes the incoming information according to the ISDN communication protocol, and when it recognizes that the incoming call is a telephone (voice), controls the analog line switching unit 5 so that the analog line switching unit 5 calls the subscriber telephone. A call signal is sent to. When there is a response from the subscriber telephone, the analog circuit switching unit 5 informs the CPU 10 that the response has been received, and the CP
U10 places the response signal on the control channel in accordance with the ISDN communication protocol, and the HDLC controller 9, layer 1
Notify the outside line (station) via the controller 7. In this way, when the call connection procedure on the control channel is completed, C
The PU 10 controls the analog circuit switching unit 5 and connects the codec 8 of the information channel containing voice information to the responding subscriber's telephone to enable a call.

When a call from the subscriber's telephone to an outside line (station) is performed, the analog circuit switching section 5 recognizes it and informs it to the CPU 10. The CPU 10 sends the call signal to the control channel according to the ISDN communication protocol. Put on, HDL
It is transmitted to the outside line (station) via the C controller 9 and the layer 1 controller 7. When the call connection procedure on the control channel is completed, the call can be made by connecting the codec 8 and the subscriber telephone in the same manner.

As shown in FIG. 2, the driver / receiver 4 is connected to a receiver 4a via a pulse transformer 11a for extracting a pulse from a signal from an ISDN network, and a plurality of drivers 4b are connected in parallel to the receiver 4a. ing. The plurality of drivers 4b are individually connected to the plurality of ISDN terminals via the pulse transformer 11b. Further, the plurality of ISDN terminals are connected to the OR circuits 12a and 12b via the pulse transformer 11c and the receiver 4c, respectively, the OR circuits 12a and 12b are connected to the driver 4d, and the driver 4d is connected to the ISDN network via the pulse transformer 11d. It is connected to the.

Therefore, the ISDN line of the present invention has a communication form in which a plurality of ISDN terminals are connected to one line, and a signal from a station of the ISDN network to the ISDN terminal is received by the receiver 4a once and is then paralleled. 4b connected to
To send to the internal bus. Next, the signal from the ISDN terminal to the station emits a pulse when a plurality of ISDN terminals send logic "0" on one signal line, as shown in FIG.
When a logic "1" is sent or no data is sent, no pulse is output. After receiving the signals from the ISDN terminals by the respective receivers 4c, these received signals are selected by the OR circuits 12a and 12b, It is transmitted to the ISDN network by the driver 4d. Thus, although the extension buses are electrically separated, the data from the ISDN terminals connected to the respective extension buses to the station are transmitted to the station as if they were connected on the same line.

As described above, in this embodiment, the IS of one line is
The DN line is once separated from the extension bus by using the driver / receiver 4, and after the signal from the ISDN network is received by the receiver 4a, a plurality of extension drivers 4b are connected in parallel and transmitted to the extension bus, Since the signals from the bus are respectively received by the plurality of receivers 4c, they are logically made one by the OR circuits 12a and 12b and transmitted to the ISDN network side by the driver 4d, so there is a logical one but electrical. The ISDN terminal is connected to a plurality of independent extension buses.

Therefore, as shown in FIG. 4, modular jacks for connecting an ISDN terminal and a subscriber's telephone can be adjacent to each other, and both the ISDN terminal and the subscriber's telephone have a star type wiring configuration for the digital exchange 2b. Take
Wiring can be done with one multi-axis cable (one route). As described above, the invention made by the present inventor has been specifically described based on the embodiment. However, the present invention is not limited to the embodiment, and can be variously modified without departing from the gist thereof. It goes without saying that.

[0019]

The effects obtained by the invention disclosed in the present application will be briefly described as follows.
According to the present invention, the reception signals from the ISDN network are individually transmitted to the plurality of ISDN terminals by the plurality of first drivers, and the transmission signals from the plurality of ISDN terminals are respectively transmitted to the plurality of second receivers. OR after receiving
ISD by second driver with logically one in circuit
By transmitting to the N network, both the ISDN terminal and the subscriber terminal are wired in a star shape, and the subscriber terminal and the I
The SDN terminals can be wired on the same route.

As a result, the wiring of the subscriber terminal and the ISDN terminal can be collectively wired by the multiaxial cable having a plurality of core wires, so that the construction can be simplified and the workability can be improved, and The construction cost can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of a digital exchange that is an embodiment of the present invention.

FIG. 2 is a circuit diagram of a driver / receiver that is an embodiment of the present invention.

FIG. 3 is a waveform diagram of output signals of each unit of the digital exchange that is an embodiment of the present invention.

FIG. 4 is a wiring diagram of an extension terminal according to a signal wiring system of a communication line which is an embodiment of the present invention.

FIG. 5 is a wiring diagram of an extension terminal according to a conventional signal wiring system for a communication line.

[Explanation of symbols]

 1,3 Outlet 2a, 2b Digital exchange 4 Driver / Receiver 4a, 4c Receiver 4b, 4d Driver 5 Analog line exchange 6 Terminal adapter 7 Layer 1 controller 8 Codec 9 HDLC controller 10 CPU 11a-11d Pulse transformer 12a, 12b OR circuit

Claims (1)

[Claims] 1. A subscriber terminal, an ISDN terminal, and an IS
In a signal wiring system of a communication line connected to a DN network through a digital exchange, a plurality of first drivers connected in parallel after receiving a signal from an ISDN network by a first receiver. Each of the signals is transmitted to the ISDN terminal, the signals from the plurality of ISDN terminals are respectively received by the plurality of second receivers, and then logically made one by the OR circuit to be transmitted to the ISDN network by the second driver. Characteristic communication line signal wiring method.