JP3146432B2 - Telephone switching equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a telephone exchange, and more particularly, to a telephone exchange having a memory backed up by a backup power supply.

[0002]

2. Description of the Related Art Some telephone exchanges can set individual data such as user data. This type of telephone exchange has a memory for storing individual data, for example, a RAM, and further includes a backup power supply for protecting the data stored in the memory.

When installing this type of telephone exchange,
Since it is not known what data is written in the memory, it is rewritten (initialized) with initial data previously written in the ROM or the like in the telephone exchange.
There is a need.

Conventionally, in order to initialize the memory, the telephone exchange has been provided with an initialization switch. Then, after installing the telephone exchange, when the power is first turned on,
When the initialization switch is turned on, the central processing unit in the telephone exchange detects this fact and initializes the memory. That is, the data written in the ROM is written in the RAM.

[0005]

A telephone exchange having a memory for storing individual data requires a backup power supply for backing up the memory and a switch for initializing the memory. Therefore, there are problems in that the number of parts is large and the cost is high, and at the same time, the miniaturization of the device is hindered.

SUMMARY OF THE INVENTION An object of the present invention is to provide a telephone exchange device in which the number of parts is reduced, the size and cost are reduced, and individual data can be set.

Japanese Unexamined Patent Publication No. Hei 3-259696 discloses a telephone exchange device which detects a change in power supply voltage and sets the exchange to an initial state based on the detection result. Since no distinction is made between the main power supply and the backup power supply, and there is no description regarding the memory, this is completely different from the present invention.

[0008]

According to the present invention, a main power supply is provided.
In the telephone exchange apparatus having a memory which is backed up by the power source for memory backup that is independent of the previous
Said voltage detection means for detecting a power supply voltage for memory backup, the conductive memory backup based on the detection signal from the voltage detecting means when the serial main power is turned on
Determining whether a source is connected to the memory;
A memory backup power supply is connected to the memory
If it is determined that there is no telephone exchange, an initialization means for initializing the memory can be obtained.

Here, the initialization means, when the detection signal is equal to or less than a predetermined threshold voltage of the memory backup power supply, the memory backup power supply .
It is determined that the power supply is not connected to the memory, and the memory is initialized.

According to the present invention, the power supply is independent of the main power supply.
In the method for initializing memory backed up by a memory backup power supply, the main power supply is turned on.
When the voltage of the memory backup power supply is detected, and the detected voltage is equal to or less than a predetermined threshold value, the memory backup power supply is connected to the memory.
Method of initializing a memory that is backed up by the power source for memory backup, characterized in that so as to initialize the memory determined not to be continued can be obtained.

[0011]

The voltage detection circuit measures the voltage of the backup power supply when the power is turned on, detects connection / disconnection of the backup power supply, and outputs a detection signal when the backup power supply is disconnected. I do. The central processing unit initializes the memory in response to the detection signal.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an embodiment of a telephone exchange according to the present invention. As shown in FIG. 1, the telephone exchange (exchange) 11 includes a central processing unit 12, a memory 13 connected to the central processing unit 12, a backup power supply 14 for backing up the memory 13, and a voltage of the backup power supply 14. And a voltage detection circuit 15 that outputs a detection signal to the central processing unit 12. It is assumed that a main power supply (not shown) is connected to the telephone exchange 11 via a main power switch (not shown).

The central processing unit 12 controls the telephone exchange 1
It takes charge of the operation 1 and mainly performs a telephone exchange operation. At the time of the telephone exchange operation, the central processing unit 12 refers to the information written in the memory 13.

The memory 13 stores information such as personal data necessary for the exchange operation of the telephone exchange device 11. Writing and reading are performed by the central processing unit 12.

The backup power supply 14 is a battery or the like, and supplies a power supply voltage to the memory 13 in order to protect contents stored in the memory 13 when the main power supply is cut off.

The voltage detection circuit 15 includes a backup power supply 1
4 is detected and compared with a predetermined threshold value. Thereby, the voltage detection circuit 15 determines whether the backup power supply 15 is connected to the memory. If it is determined that the backup power supply 15 is not connected, a detection signal is output to the central processing unit 12.

Hereinafter, the initialization operation when the telephone exchange is installed will be described with reference to FIG.

When the main power supply is turned on in step S11, the power supply voltage is supplied to the central processing unit 12 and the voltage detection circuit 15, respectively.

When the power supply voltage is supplied, the voltage detection circuit 15 detects the voltage of the backup power supply 14 in step S22. Then, in step S23, a comparison is made with a predetermined threshold value. This comparison is performed to detect whether the backup power supply 14 is connected to the memory 13 or not. That is, when a voltage exceeding the threshold value is detected, it is determined that the backup power supply 14 is connected to the memory 13, and when a voltage lower than the threshold value is detected, the backup power supply 14 is connected to the memory 13. Judge that you have not. The result of the determination is notified to the central processing unit 12 by a detection signal.

The central processing unit 12 receives the detection signal from the voltage detection circuit 15 and the backup power supply 14
If not, the memory 13 is initialized in step S24. That is, the data written in advance in the ROM or the like of the central processing unit is written in the memory 13. Conversely, if the backup power supply 14 is connected to the memory 13, the process proceeds to step S25, and the replacement operation is started without initializing the memory 13 and keeping its contents.

As described above, in the telephone exchange according to the present embodiment, when the main power is turned on, if the backup power is not connected, the memory is initialized, and if the backup power is connected, the memory is initialized. Does not initialize the memory. Therefore, when the telephone exchange is installed for the first time, the memory is automatically initialized, and when the power is turned off or the like, the memory is not initialized.

[0023]

According to the present invention, since the presence or absence of the connection of the backup power supply is detected, a switch for instructing the initialization of the memory becomes unnecessary, the number of parts is reduced, and the size of the apparatus is reduced. And cost reduction can be realized.

Further, an artificial operation for initializing the memory is not required.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a flowchart for explaining an operation at the time of installation of the telephone exchange of FIG. 1;

[Explanation of symbols]

 11 telephone exchange device (exchange) 12 central processing unit 13 memory 14 backup power supply 15 voltage detection circuit

Continued on the front page (72) Inventor Takashi Matsumoto 3-19-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Seiji Matsunami 3- 19-2, Nishi-Shinjuku, Shinjuku-ku, Tokyo (56) References JP-A-3-259696 (JP, A) JP-A-63-131799 (JP, A) JP-A-63-169897 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) H04Q 3/54-3/56 H04M 3/22-3/36

Claims (3)

(57) [Claims] 1. A telephone exchange having a memory which is backed up by a memory backup power supply which is independent of a main power supply , wherein when said main power supply is turned on,
Voltage detecting means for detecting a voltage of the power source for memory backup, the eye based on the detection signal from said voltage detection means
Memory backup power supply is connected to the memory
Judge whether the memory backup power supply is
Initializing means for initializing the memory when it is determined that the telephone is not connected to the memory . 2. When the detection signal indicates that the voltage of the memory backup power supply is equal to or lower than a predetermined threshold value, the initialization means may execute the memory backup operation.
Power supply is not connected to the memory
2. The telephone exchange according to claim 1 , wherein said memory is initialized. 3. A method of initializing a memory which is backed up by a memory backup power source that is independent of the main power source, the detecting memory bus <br/> supply voltage Kkuappu when the main power is turned on, If the detected voltage is equal to or less than a predetermined threshold, the memory back
Power supply is not connected to the memory
Characterized by being adapted to initialize the memory Te
A method for initializing memory that is backed up by a memory backup power supply.