JP2881487B2 - Live insertion and removal circuit - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an option card in which a PBX can be added.

(Prior Art) FIG. 2 shows a configuration of a conventional option card. In FIG. 2, reference numeral 20 denotes a PBX main unit, and reference numeral 21 denotes an option card, which has the following blocks. 22 is a highway buffer, 23 is an audio circuit unit that generates audio data, 24 is a control unit, 25 is an interface circuit that controls communication between the PBX main unit and the control unit, 26 is a data buffer, and 27 is activated by turning on power. A reset circuit unit, 28 is an address buffer, and 29 is a power supply unit.

The operation of the conventional option card configured as described above will be described. Option card 2 for PBX main unit 20
When the power is turned on after adding 1 to the power supply unit 29, power is supplied to each block in the option card 21.First, the interface circuit 25 stops the operation of the highway buffer 22 and the data buffer 26, and the reset circuit unit 27 When the interface circuit 25 is activated, the interface circuit 25 activates the control unit 24, the highway buffer 22, and the data buffer 26, and the audio data generated by the audio circuit unit 23 is transmitted to the PBX main unit 20 via the highway 30. , Also P
The BX main unit 20 includes a data buffer 26 and an address buffer 28.
, And communicates with the control unit 24 via the interface circuit 25.

(Problems to be Solved by the Invention) However, in the above-described conventional configuration, when an option card is added while the power is turned on, unnecessary noise data is generated from the highway buffer and the data buffer because the interface circuit is not operating. Sent out, PB
There was a risk of causing a failure in the X master.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problem, and an object of the present invention is to provide an option card in which unnecessary noise data is not transmitted even if the card is added while the power is turned on.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a power supply unit A for supplying power to an interface circuit, a highway buffer and a data buffer to an option card added to a PBX main unit, and a control unit. , A reset circuit section, and a power supply section B for supplying power to the address buffer. The power supply section A supplies power to the interface circuit before the expansion is completed to initialize the highway buffer and the data buffer. The power supply section B operates the reset circuit section when the power supply section B is completed and the expansion is completed, and the reset circuit section which has started operation starts the interface circuit.

(Operation) Therefore, according to the present invention, the option card is
Before the expansion to the main unit, the highway buffer and the data buffer are stopped, and after the expansion circuit is activated by the reset circuit unit, communication with the PBX main unit is started. Since the data buffer is already stopped, unnecessary noise data is not transmitted.

Embodiment FIG. 1 shows a block configuration of an option card according to an embodiment of the present invention. In FIG. 1, 1 is PB
The X main unit 2 is an option card and is composed of the following blocks. 3 is a highway buffer, 4 is an audio circuit unit, 5 is a control unit, 6 is an interface circuit, 7
Is a data buffer, 8 is a reset circuit section, 9 is an address buffer, 10 is a power supply section A which starts up before an option card is added, and 11 is a power supply section B which starts up when an option card is added.

Next, the operation of the embodiment configured as described above will be described. In the above embodiment, before adding the option card 2 to the PBX main unit 1, the power supply unit A10 is turned on to start the interface circuit 6, and after the highway buffer 3 and the data buffer 7 start up in the initial state, Stop the operation. After the above, an option card is added, the power supply section B11 is turned on, the reset circuit section 8 is activated, and the reset circuit section 8 activates the interface circuit 6. The interface circuit 6 activates the control unit 5, the highway buffer 3, and the data buffer 7, and the audio data generated by the audio circuit unit 4 is transmitted to the PBX main unit 1 via the highway 14, and the PBX main unit 1 It communicates with the control unit 5 via the interface circuit 6 via the buffer 7 and the address buffer 9.

(Effects of the Invention) As is clear from the above embodiment, the present invention controls the power supply unit for supplying power to the interface circuit, the data buffer, and the highway buffer before the option card is added to the PBX main unit, and simultaneously controls the expansion. Unit, reset circuit, and power supply unit that supplies power to the address buffer. The highway buffer and the data buffer are initialized before the expansion is completed, and the interface circuit is started by the reset circuit when the expansion is completed. By doing so, there is an effect that an option card can be added without causing a failure to the PBX main unit.

[Brief description of the drawings]

FIG. 1 is a block diagram of an option card according to an embodiment of the present invention, and FIG. 2 is a block diagram of an option card according to a conventional embodiment. 1,20 …… PBX main unit, 2,21 …… Option card, 3,22
…… Highway buffer, 4,23 …… Audio circuit part, 5,24…
... Control unit, 6,25 ... Interface circuit, 7,26 ... Data buffer, 8,27 ... Reset circuit unit, 9,28 ... Address buffer, 10 ... Power supply unit A, 11 ... Power supply unit B , 29 ……
Power supply part.

Claims (1)

(57) [Claims] An interface circuit activated between a PBX main unit and a control unit by a reset circuit unit, an address buffer and a data buffer between the interface circuit and the PBX main unit, an audio circuit unit and the PBX main unit are provided. An expansion card for a PBX having a highway buffer for transmitting voice data between devices, comprising: a power supply unit A for supplying power to the interface circuit, the highway buffer, and the data buffer; and a power supply unit A for the control unit, the reset circuit unit, and the address buffer. The power supply unit A has two power supplies, a power supply unit B for supplying power. The power supply unit A supplies power to the interface circuit before the expansion is completed, and starts up the highway buffer and the data buffer in an initial state, thereby starting the expansion. When completed, the power supply unit B operates the reset circuit unit, and the reset circuit unit Activates the interface circuit.