JPH05336561A - Key telephone device - Google Patents

Abstract

PURPOSE:To provide the key telephone device which is applicable to speech characteristic standards and trunk line matchability standards differing dependent on forwarding destinations without exchanging any component. CONSTITUTION:A transmitting and receiving circuit 213 whose communication characteristics can be selected and set and a two-line/four-line converting circuit 212 are connected to the system control circuit 23 of a main device 2 through a telephone set control circuit 13 to which specific data on communication characteristics are inputted in a telephone set 1, and the control circuit 23 is selected by controlling the trunk line control circuit 215 of a trunk line unit device 21 and specified speech characteristics and trunk line matchability are set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a button telephone device which is compatible with a plurality of destination-specific call characteristic standards and office line compatibility standards.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing a schematic configuration of a conventional button telephone device, and FIG. 4 is a two-line to four-line converting circuit 312 and a transmitting / receiving circuit 313 of a station line unit 31 in the button telephone device of FIG. 3 is a circuit diagram showing a circuit configuration of FIG.

In FIG. 3, 1 is a key telephone, 2 is a main unit, 3 is a dedicated line for transmitting a transmission signal between the key telephone 1 and the main unit 2 in a time division multiplex communication system, and 4 is a main unit 2.
Is a station line for connecting to the subscriber network.

The key telephone 1 is a digital device that converts a signal transmitted to and from the main unit 2 from analog to digital for transmission, and converts digital to analog for reception.・ Analog signal conversion circuit (hereinafter referred to as D / A signal conversion circuit) 11,
Call circuit 12 for transmitting and receiving, and button telephone 1
A telephone control circuit (hereinafter referred to as an APU) that controls the entire key telephone 1 so that the telephone performs time division multiplex communication with the main unit 2.
13).

On the other hand, the main unit 2 serves as an interface between the subscriber network and the main unit 2 as a central office unit unit (hereinafter referred to as TRK) 31, and an interface between the key telephone 1 and the main unit 2. Telephone unit (hereinafter referred to as DEC) 32 of TRK31 and DEC
A key telephone 1 that controls 32 and is subordinate to the main device 2.
And a system control circuit (hereinafter referred to as CPU) 33 for controlling the entire key telephone system.

[0006] The TRK 31 includes a call monitoring circuit 311 for monitoring a loop state of an office line, and a 2-wire 4-wire conversion circuit (hereinafter referred to as a 4-wire conversion circuit) for converting a bidirectional 2-wire transmission of a subscriber line for digital communication. A HYB circuit) 312, a transmission / reception circuit 313 for determining transmission / reception characteristics, and a D / A signal conversion circuit 314 for interfacing with the DEC 32.
And a local line control circuit (hereinafter C
315).

In FIG. 4 showing the specific circuit configurations of the HYB circuit 312 and the transmission / reception circuit 313 of the TRK 31, the HYB circuit 312 has a 2-wire / 4-wire conversion transformer 312a for converting 2-wire transmission into 4-wire transmission. It is composed of a local line matching circuit 312b for matching the local line impedance and suppressing the sneak in the two-line to four-line conversion. In the transmission / reception circuit 313, 313a is a D / A signal conversion circuit 314.
In the transmission circuit, the transmission signal converted into an analog signal is given a speech loss and is output to the HYB circuit 312. Three
Reference numeral 13b is a reception circuit which gives a call loss to the reception signal converted into four lines by the HYB circuit 312 and outputs it to the D / A signal conversion circuit 314.

These transmitting circuit 313a and receiving circuit 313
An amplifier or the like is used for b, and these characteristics such as gain are
It is specified in advance according to the call characteristics of the destination. The above-mentioned station line matching circuit 312b is also specified as the one that is previously matched to the destination station line impedance.

The CPU 33 controls the COP 315 and the entire button telephone apparatus, and is changed by the destination. As described above, the TRK 31
The transmission / reception circuit 313 including the transmission circuit 313a and the reception circuit 313b and the station line matching circuit 312b are also changed depending on the destination of the button telephone apparatus.

As described above, in the conventional key telephone device, the CPU 33 of the main device 2 and the transmitter / receiver circuit 313 and the line matching circuit 312b of the TRK 31 are exchanged, so that different call characteristic standards for each destination and It corresponded to the station line compatibility standard.

[0011]

However, in the above-mentioned conventional button telephone apparatus, since the call characteristic in the transmitting / receiving circuit 313 and the station line matching in the station line matching circuit 312b are specified, the call characteristic standard and the station characteristic are specified. There is a problem that different types of button telephone devices must be prepared for each destination having different line matching standards.

The present invention solves such a conventional problem, and provides a button telephone device capable of coping with different call characteristic standards and office line matching standards depending on destinations with a single device. The purpose is.

[0013]

In order to achieve the above-mentioned object, the present invention selects from a call characteristic and a line matching which are different from each other by a call characteristic corresponding circuit and a line matching circuit provided inside. A station line unit device having a transmitter / receiver circuit and a two-wire / four-line conversion circuit that can be set by the above, and a station line control circuit for controlling the transmitter / receiver circuit and the two-wire / four-line converter circuit, and input communication characteristics For storing the data for designating the call and the call characteristic via the station line control circuit so that the transmitter / receiver circuit and the 2-wire / 4-wire conversion circuit are set to the specified communication characteristics by the stored specified data. A main device having a corresponding circuit and a system control circuit for controlling the station line matching corresponding circuit; and means for inputting data designating communication characteristics set by the above-mentioned transmission / reception circuit and two-wire / four-wire conversion circuit. It was obtain configuration.

[0014]

With this configuration, the system control circuit stores the input from the means for inputting the designated data, and the stored characteristic data allows the speech characteristic corresponding circuit in the transmitter / receiver circuit via the station line control circuit. To obtain the desired call characteristics, and also to control the station line matching circuit in the 2-wire to 4-wire conversion circuit to obtain the desired station line matching and switch to the desired call characteristics and station line matching. You can Therefore, the call characteristics standards and station line compatibility standards that differ depending on the destination are 1
It is possible to handle with a type of key telephone device.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a schematic configuration of an embodiment of a key telephone device of the present invention, and FIG. 2 is a two-line to four-wire conversion circuit 212 of a station line unit device 21 in the key telephone device of FIG.
FIG. 6 is a circuit diagram showing a specific circuit configuration of the transmission / reception circuit 213. The same parts as those in FIGS.

The main unit 2 is a station line unit (TRK) as an interface between the subscriber network and the main unit 2.
21, a telephone unit (DEC) 22 as an interface between the key telephone 1 and the main unit 2, and controls the TRK 21 and DEC 22 and also controls the main unit 2
A system control circuit (CP) for controlling the entire key telephone system for controlling the key telephone 1 subordinate to
U) 23.

The TRK 21 includes a call monitoring circuit 211 for monitoring a loop state of a station line, and a 2-wire 4-wire conversion circuit (HYB) for converting a bidirectional 2-wire transmission of a subscriber line into a 4-wire transmission for a digital call. Circuit 212, a transmission / reception circuit 213 for determining transmission / reception characteristics, a D / A signal conversion circuit 214 for interfacing with the DEC 22, and TRK2.
1) and a central office line control circuit (COP) 215 for controlling the entire unit 1.

Then, the HYB circuit 21 of the TRK 21
2, which shows a specific circuit configuration of the transmission line 2 and the transmission / reception circuit 213, the HYB circuit 212 matches the 2-line to 4-line conversion transformer 212a for converting 2-line transmission into 4-line transmission and the local line impedance. It is composed of a local line matching circuit 212b for suppressing wraparound in 2-line to 4-line conversion. In the transmission / reception circuit 213, 213a is the D / A signal conversion circuit 2
14 is a transmission circuit which gives a transmission loss to the transmission signal converted into an analog signal in 14 and outputs it to the HYB circuit 212. Reference numeral 213b gives a call loss to the received signal which has been four-line converted by the HYB circuit 212, and the D / A signal conversion circuit 214
It is a receiving circuit that outputs to.

Further, in FIG. 2, reference numeral 212c is composed of a plurality of connection signal path selection circuits, for example, a local line matching property for matching the local line impedance and for suppressing the wraparound in the two-line to four-line conversion. It is a station line matching correspondence circuit to be connected to each of the circuits 212b, and the station line matching by the desired station line matching circuit 212b among the plurality of station line matching circuits 212b is 2 lines 4 under the control of the COP 215. It is provided to the line conversion transformer 212a.

On the other hand, reference numerals 213c and 213d are composed of a plurality of output signal selection circuits, and the COP 215 controls the transmission circuit to obtain desired transmission characteristics and reception characteristics among the transmission circuits 213a and 213b. 21
3a, a call characteristic correspondence circuit adapted to be connected to the receiving circuit 213b.

Next, the operation of the above embodiment will be described.
First, the destination of this key telephone system is that the key telephone 1
When the APU 13 is input and designated, the APU 13 transmits the designation data of the destination to the CPU 23 of the main unit 2 which is the host of the button telephone 1, and the CPU 23 stores this data.

Then, the CPU 23 sends the stored destination data to the COP 215 of the higher station line unit device 21. This COP 215 is a 2-line to 4-line conversion circuit 212 and a station line matching correspondence circuit of the transmission / reception circuit 213. 212c and the call characteristic correspondence circuits 213c and 213d are switched and controlled,
Selected local line matching circuit 212b and transmission circuit 213a
By connecting to the receiving circuit 213b with the line receiving circuit 213b, the station line matching characteristic of the 2-line to 4-line converting circuit 212 and the communication characteristic of the transmitting / receiving circuit 213 are switched according to a desired destination.

As described above, according to the above-described embodiment, by inputting the data regarding the destination from the key telephone 1, the local line matching circuit of the 2-line to 4-line conversion circuit 212 in the station line unit device 21. 212c and the call characteristic correspondence circuits 213c and 213d of the transmitting / receiving circuit 213 can be switched to obtain the desired destination station line matching circuit 212b, the transmitting circuit 213a, and the receiving circuit 213b, and thus one button telephone It is possible for the device to correspond to different destination office line compatibility standards and call characteristic standards.

According to the above embodiment, in order to store the destination in the CPU 23 in the host main unit 2, when a plurality of station line unit devices 21 are mounted in the main unit 2,
By the destination setting input by one button telephone 1, the station line matching characteristics of the 2-line to 4-line conversion circuits 212 and the transmission / reception circuits 213 of all the station line unit devices 21 mounted on the same main unit 2 are transmitted. The call characteristics of can be switched at once according to the desired destination.

In the above embodiment, the telephone 1 is used as the means for inputting the designated data, but the means for inputting the designated data directly connected to the main unit 2 or the designated data built in the main unit 2 is used. It may be a means for inputting.

[0026]

As is apparent from the above embodiments, according to the key telephone apparatus of the present invention, the communication characteristics of the transmitter / receiver circuit and the 2-wire / 4-wire conversion circuit in the station line unit device are designated. It is possible to switch to a desired communication characteristic based on the control of the system control circuit in the main unit via the means for inputting data, and therefore one button telephone device can support different communication characteristic standards for each destination. You can

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a key telephone device of the present invention.

FIG. 2 is a circuit diagram showing a specific circuit configuration of a 2-wire / 4-wire conversion circuit and a transmission / reception circuit of the office line unit device in FIG.

FIG. 3 is a block diagram showing a configuration of a conventional key telephone device.

FIG. 4 is a circuit diagram showing a specific circuit configuration of a 2-wire / 4-wire conversion circuit and a transmission / reception circuit of the office line unit device in FIG.

[Explanation of symbols]

 1 button telephone 2 main device 13 telephone control circuit 21 station line unit device 23 system control circuit 212 two-line four-line conversion circuit 213 transmission / reception circuit 215 station line control circuit

Claims (2)

[Claims] 1. A transmitter / receiver circuit capable of selecting and setting a call characteristic from a plurality of call characteristics different from each other by a call characteristic corresponding circuit provided inside and a plurality of station lines different from each other by a station line matching correspondence circuit. A station line unit device having a two-line to four-line conversion circuit capable of selecting and setting station line matching from among the matching and a station line control circuit for controlling these communication characteristic circuits, and designating an input communication characteristic Communication data corresponding to the communication characteristic corresponding circuit via the station line control circuit so that the transmitting / receiving circuit and the 2-wire / 4-wire conversion circuit are set to the specified communication characteristics by the stored specified data. And a system control circuit for controlling the station line matching correspondence circuit, and means for inputting data designating communication characteristics set by the transmission / reception circuit and the 2-wire / 4-wire conversion circuit. Button phone apparatus. 2. A key telephone device according to claim 1, wherein the means for inputting data designating communication characteristics is provided in a key telephone equipped with a telephone control circuit for controlling the main unit by the inputted data.