KR0130722B1 - End exchange hook detection device - Google Patents

Abstract

The hook state detecting apparatus in a full electronic switching system comprises a memory unit composed of a first area initiated by a initial state of power supply and a reset signal, for storing hook state data generated from a subscriber's line, and a second area interfaced with an upper device, for storing subscriber numbers and line numbers changed and detected in the hook state, a comparing unit for comparing the hook state's changed data currently generated on the subscriber line and the hook state data stored in the first area of the memory unit, a latching unit for outputting a chip enable signal and a writing signal if the hook state data compared in the comparing unit are different from each other and latching the compared hook state data, and a connecting unit for mediating an interface connection for an access of both directions to the same address in reading the hook state data stored in the second area of the memory unit from the upper device, whereby providing a satisfactory connection with a reduction of a load occurrence and the reliability in a system operation.

Description

Hook state detection device in dry electronic exchange

1 is a diagram illustrating a hook detection operation by a Summon Scanning method in a conventional electronic switch.

2 is a block diagram of a hook state detection apparatus in an electronic switch according to the present invention.

* Explanation of symbols for main parts of the drawings

10: subscriber 20: memory unit

30: comparison circuit portion 40: latch circuit portion

50: connection prevention part

The present invention relates to an electronic switch system of the present invention, in particular, to exclude a virtual connection state due to noise of a subscriber line in detecting a hook state of a subscriber and to detect and store only a subscriber having a change in the hook state to provide efficiency in call connection processing. will be.

In the conventional electronic switch, the hook state detection device is a serial (Serial) that sequentially enters from the channel 0 of the first subscriber board to the channel 511 of the last subscriber board in the first frame, as can be seen in FIG. A memory 1 for storing latched data, and a previous hook stored in the memory 1 in a second frame, having a serial / parallel conversion circuit for latching hook data by 8 channels. And a comparator 2 for reading the data and comparing it with the hook data coming from the current frame, and a register 3 for latching and storing the result when the hook state change of the line occurs in comparison with the unit of 32 channels.

In the conventional hook state detection device as described above, high data is serially output continuously when low data is on-hook when the hook state of the subscriber is off-hook for each channel. At this time, the serial / parallel conversion circuit latches the applied hook data for each byte by byte and stores the hook data in the memory 1. If the hook data applied from the subscriber line in the second frame is the status data, the hook data stored in the memory 1 in the first frame becomes the data of the previous state. Therefore, the comparator 2 reads the previous state data of the memory 1 and compares the current data with each channel. At this time, if the channel of the hook change of the line is detected, the board is set to 1 in the relevant register (3). If the data in the previous state and the data in the current state are the same, the register (3) is cleared to ø.

At this time, the host device reads the data stored in the register 3 to determine the board in which the hook change of the line has occurred, and reads 4 bytes up to 32 in the channel? Stored in the memory 1 to read the hook data of the board. Therefore, it is possible to know whether hook change of line occurs by board by reading register value in upper device.

At this time, if the memory 1 in which the hook data value of the board in which the register 3 value is read is accessed is accessed, it is found that a channel having a hook change occurs in the corresponding line.

As described above, the conventional hook state detection operation detects a hook change of a line for each subscriber board unit. Thus, even if a hook change occurs only in one subscriber line, the hook state of the 32 subscriber channels, which are the entire board subscribers, is compared and read-processed. There was a problem that the system malfunctioned due to a lot of load in the.

The present invention has been made in view of the above-described problems, and its object is to detect and store only the hooked line of the subscriber line in the electronic switchboard, thus eliminating the call processing load according to the comparison of the entire board subscriber line. It is designed to provide efficiency in call connection processing.

A feature of the present invention for achieving the above object is to interface with a first area and an upper device, which is initialized by an initial state of a power supply and a reset signal, and stores hook state data generated in a subscriber line in an all-electronic exchange. A memory means comprising a second area for storing the line number and the subscriber number detected by the change of the hook state, and the hook state change data of the currently generated subscriber line and the hook state data stored in the first area of the memory means. A comparison means, a latch means for outputting a chip enable signal and a write signal and latching the compared hook state data when the hook state data compared to the comparison means differ from each other and stored in a second area of the memory means in a higher-level device. Interface for accessing the same address from both sides when reading hook status data It provides around the electronic switch-hook detection apparatus comprising: a connection means for connecting the intervention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a block diagram of a hook state detection apparatus in an electronic switch according to the present invention.

As can be seen in the figure, the present invention comprises a subscriber 10, a memory unit 20, a comparison circuit unit 30, a latch call unit 40, a connection preventing unit 50, the memory unit 20 The first area 20a consists of the second area 20b, and the first area 20a latches and stores the continuous hook data applied from the subscriber 10 in the first frame, and the second area 20b. Stores the subscriber board number and channel number for latched off-hook or on-hook hook data and has an interface port for access from the host device. The comparison circuit unit 30 reads the previous hook data stored in the memory unit 20 in the second frame, records and stores the current hook data, and compares the read previous hook data with the current hook data. The latch circuit unit 40 latches the detected hook data when detecting a change in the hook state because they are different from each other in the hook data compared to the comparison circuit unit 30.

Referring to the operation of the present invention having a function as described above are as follows.

In an initial state where power is supplied or when a reset signal is supplied, the first region 20a and the second region 20b of the memory unit 20 enter an initialization state.

After that, when a signal of an off-hook state is generated from the subscriber 10 line in the first frame, the raw data is stored in the first area 20a of the memory unit 20 and turned off from the subscriber 10 line in the second frame. When a signal of a hook state is generated, data of the current state generated before storing in the first area 20a of the memory unit 20 is applied to the comparison circuit unit 30, and the first area 20a of the memory unit 20 is applied. After reading the previous data stored in the memory, the current generated data is stored in the first area 20a of the memory unit 20. Thereafter, the comparison circuit unit 30 compares the read hook data with the current hook data, and compares the result with the latch data through the latch circuit 40 when the previous hook data is different from the current hook data. A VAL alarm bit for generating a chip enable signal and a write enable signal for storage in the second area 20b of the device and displaying valid data as shown in (b). Set to store the low data, and store data in the second area 20b of the memory unit 20 when the hook data is off-hook or on-hook.

At this time, the host device accesses data stored in the second area of the memory unit 20 to read the hook state information of the subscriber, and then sets the MSB to 1 to notify that the hook state information has been read.

At this time, the connection preventing unit 50 arbitrates when the user wants to simultaneously access the information of the hook state stored in the second area 20b of the memory unit 20 in the left port and the right port. To prevent.

As described above, the hook state change generated from the subscriber board line of the electronic switchboard is analyzed and stored only in the subscriber's preference that has changed, and the memory is notified to the host device. Is provided.

Claims (1)

In an electronic switching system, a line number and a subscriber number, which are initialized by an initial state of a power supply and a reset signal, are interfacing with a first area and an upper device that store hook state data generated from a subscriber line, and the hook state is changed. A memory means comprising a second area for storing the data; a comparison means for comparing the hook state change data of the currently generated subscriber line with the hook state data stored in the first area of the memory means; and a hook state compared with the comparison means. Latch means for outputting a chip enable signal and a write signal when data differs from each other, and latching the compared hook state data; and accessing the same address when reading the hook state data stored in the second area of the memory means from an upper device; And a connecting means for arbitrating the interface connection. Around the electronic switch-hook detection apparatus as.