JP2870063B2 - Digital key telephone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention can easily configure a key telephone system by allowing a general-purpose analog single telephone and a dedicated digital key telephone to be arbitrarily connected to a main device. The present invention relates to a digital key telephone apparatus configured as described above.

[Conventional technology]

Generally, in this type of digital key telephone apparatus, a dedicated digital key telephone (hereinafter referred to as a digital telephone) is connected to a connection terminal.
Separately, in order to connect a general-purpose analog single telephone (hereinafter referred to as an analog telephone) to a connection terminal, a dedicated terminal I / F circuit for the analog telephone is used to convert an analog signal into a digital signal every time. It is necessary to add an analog I / F adapter with D function.

Here, FIG. 2 shows the configuration of a conventional digital key telephone apparatus used in combination with a digital telephone and an analog telephone.

That is, in FIG. 2 arrangement, 11 denotes the main unit of the digital key telephone system, 12 ₁ to 12 _n is a telephone line
Line I / F with D / A conversion circuit connected to CO ₁ to CO _n
A circuit 14 is a digital communication circuit for connecting a digital signal. The digital communication circuit 14 is directly connected to a digital telephone A. Reference numeral 15 denotes a control circuit for controlling the entire apparatus system, 16 denotes an incoming signal generation circuit for generating an incoming signal, and 17 ₁ to 17 _n denotes a dedicated D added to connect the analog telephone B to the connection terminal. This is an analog I / F adapter with a / A conversion circuit.

 Next, the operation of the above-described conventional configuration will be described.

First, with respect to the digital telephone A, the digital signal to be transmitted is taken as it is into the digital communication circuit 14, and is controlled by the control circuit 15 to control the line I / O.
Flow F circuit 12 _1, once after having been converted into an analog signal by the line I / F circuit 12 _1, and of being outputted to the telephone line CO _1, this way, can call by the digital telephone set A is there.

As for the analog phone B, the analog signal transmitted is, after being digital signals by an analog I / F adapter 17 ₁ having a D / A converter circuit, just as in the case of the digital telephone set A , flows through the line I / F circuit 12 ₁ is incorporated into the digital communication circuit 14, the line I /
Telephone line is converted back into an analog signal by F circuit 12 ₁
The signal is output to CO ₁ , and here again, the telephone call by the analog telephone A becomes possible.

That is, in the case of the conventional digital key telephone apparatus, the connection is made by adding an analog I / F adapter having a dedicated D / A conversion circuit in addition to the connection of the digital telephone A to the connection terminal. The connection of the analog telephone B to the terminal is enabled.

[Problems to be solved by the invention]

However, in the above-mentioned conventional digital key telephone apparatus using both a digital telephone and an analog telephone, a dedicated analog I / F having a D / A conversion circuit is required to enable the analog telephone B to be connected to the connection terminal. The additional installation of an adapter is indispensable. On the other hand, the digital telephone A cannot be directly connected to the connection terminal to which this analog I / F adapter has been added, and new special rebuilding is performed. Or, there is a problem that the analog I / F adapter cannot be used unless it is removed.

SUMMARY OF THE INVENTION An object of the present invention is to provide a digital key telephone apparatus in which a digital telephone and an analog telephone can be arbitrarily connected to connection terminals. is there.

[Means for solving the problem]

The present invention, in order to achieve the above object, supplies a call current from a power supply, and a power supply unit provided with a connection terminal for telephone connection, a power supply unit interposed between the power supply unit, A connection detection circuit for detecting the connection of the telephone to the terminal and determining whether the signal from the connection terminal is a digital signal or an analog signal based on the amount of call current; If so, digital transmission is performed, and if it is an analog signal, analog transmission and reception are performed.

[Action]

Therefore, according to the present invention, when the telephone is connected to the connection terminal provided in the power supply unit, the connection detection circuit detects the connection of the telephone, and the signal from the connection terminal is converted into a digital signal according to the amount of call current. If the signal is determined as a signal, digital transmission can be performed. If the signal from the connection terminal is determined as an analog signal, analog transmission and reception can be performed. There is an effect that the key telephone system can be easily configured by arbitrarily connecting any of them.

〔Example〕

FIG. 1 shows the configuration of one embodiment of the present invention.

In the configuration of FIG. 1, reference numeral 1 denotes a main unit to which the present embodiment is applied, and 2 ₁ to 2 _n are connected to telephone lines CO _{1 to} CO _n and have a line I having a D / A conversion circuit. / F circuit, 3 is an analog communication switch for connecting analog signals, and 4 is a digital communication circuit for transmitting digital signals. Reference numeral 5 denotes a control circuit for controlling digital and analog signals and the entire system, and reference numeral 6 denotes an incoming signal generation circuit for generating an incoming signal.

Reference numerals 7 _{1 to} 7 _{n denote} terminal I / F circuits for arbitrarily connecting the digital telephone A or the analog telephone B. Reference numeral 8 denotes a main unit 1 incorporated in these terminal I / F circuits 7 _{1 to} 7 _n.
A power supply unit 9 for supplying 24V power to the power supply unit 9 is interposed between the power supply unit 24V and the power supply unit 8, detects the connection of the telephone to the connection terminal, and converts a signal from the connection terminal into a digital signal based on a communication current amount. A connection detecting circuit for determining whether the signal is an analog signal or a digital signal, that is, whether the telephone connected to the connection terminal is a digital telephone A or an analog telephone B; This is a relay that turns on and off.

Subsequently, an operation in the configuration of the above embodiment will be described.

In Figure 1 embodiment configuration, to the terminal I / F circuit 7 _1,
If digital telephone A is connected,
24V talk current is supplied from the power supply unit 8 via the connection detection circuit 9, and the connection detection circuit 9 detects the connection of the telephone to the terminal. Then, when the digital telephone A starts operating, the connection detecting circuit 9 detects the connection of the telephone to the connection terminal, and determines that the telephone connected to this connection terminal is the digital telephone A according to the amount of call current. by determination, the digital signal is transmitted to the digital communication circuit 4 through the transformer of the power supply unit 8, and is controlled by the control circuit 5 flows to the line I / F circuit 2 _1, the line I / F on which are temporarily converted into an analog signal by circuit 2 _1, shall apply intended to be output to the telephone line CO _1, here, it is possible to call by the digital telephone set a.

Meanwhile, in turn, for the same terminal I / F circuit 7 ₁ described above, the analog telephone B in place of the digital telephone set A
Is connected, the connection detection circuit 9 detects the connection of the telephone to the connection terminal, as described above. Then, when the handset of the analog telephone B is lifted and a telephone call is started, the connection detection circuit 9 determines that the telephone connected to the connection terminal is the analog telephone B based on the amount of communication current. 3 to control the analog signal to the line I / F circuit 2 ₁
Flushed, one which output from the line I / F circuit 2 ₁ leave telephone line CO ₁ analog signals, again, it is possible to call by the analog telephone set B.

Therefore, in the above embodiment, it is determined whether the telephone connected to the connection terminal is the digital telephone A or the analog telephone B, and the operation and control corresponding to each can be performed. Without worrying about the troublesome analog I / F adapter.
Any type of analog or digital telephone can be connected to the connection terminal, and as a result, the analog I / F adapter that was required in the conventional case becomes unnecessary.

〔The invention's effect〕

According to the present invention, as is apparent from the configuration of the above embodiment, when a telephone is connected to the connection terminal provided in the power supply unit, the connection detection circuit detects the connection of the telephone and connects the telephone. If the signal from is a digital signal, the connected telephone is determined to be a digital telephone and digital transmission is performed. If the signal from the connection terminal is an analog signal, the connected telephone is an analog telephone. Analog transmission and reception can be performed by recognizing that
It is not necessary to use a dedicated analog I / F adapter only for analog telephones, and without the hassle of selecting required connection terminals, for the same connection terminal, for example, according to TPO, digital telephone or analog telephone Any of them can be used and changed arbitrarily and connected.
In addition, since existing analog telephones can be easily connected to the key telephone system, it is not necessary to use a key telephone dedicated to the system, so that the system itself can be reduced in price easily and easily. effective.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a connection structure of a main part of a digital key telephone apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a connection structure of a main part of a conventional digital key telephone apparatus. . 1,11 ...... main _{unit, 2 1 ~2 n, 12 1} ~12 n ...... D / A conversion circuit with the line I / F circuit, 3 ...... analog conversation switch, 4, 14 ...
... Digital communication circuit, 5,15 ... Control circuit, 6,16 ... Incoming signal generation circuit, 7 _{1 to} 7 _n ... Terminal I / F circuit, 8 ... Power supply unit, 9 ... Connection detection circuit 10 …… Relay, 17 _{1 -1}
7 _n …… Analog I / F adapter with D / A conversion circuit, CO _{1 to} C
O _n ...... telephone line, A ...... dedicated digital key telephone set,
B: General purpose analog single phone.

Claims (1)

(57) [Claims] 1. A power supply unit for supplying a call current from a power supply and having a connection terminal for connecting a telephone, and a telephone connection to the connection terminal interposed between the power supply and the power supply unit. And a connection detection circuit that determines whether the signal from the connection terminal is a digital signal or an analog signal based on the amount of call current. A digital button telephone apparatus comprising: a control circuit for performing digital transmission by determining that the telephone is a telephone, and for an analog signal, determining that the connected telephone is an analog telephone and performing analog transmission and reception. .