KR100327044B1 - Apparatus for reducing subhighway of exchange - Google Patents

Abstract

The present invention relates in particular to an apparatus for reducing subhighways used in an announcement broadcasting apparatus of a switch and a dual tone multi frequency (DTMF) receiving apparatus. In the prior art, since both the transmitting and receiving subhighways are allocated to the announcement broadcasting unit 102 and the DTMF unit 103 accommodated in the access switching subsystem (ASS-S) of the exchange, In the case of this large matched exchange subsystem or when configured as a matched exchange subsystem that is used for a particular purpose, there is a problem of a lack of subhighway. In the present invention, the sub-highway that matches the time switch 204 in the announcement broadcasting unit 202 and the DTMF unit 203 of the exchange is reduced. Accordingly, the sub-highway is reduced by half while maintaining the maintenance functions of the announcement and DTMF devices, thereby reducing the cable and maximizing the capacity of the time switch 204.

Description

Subhighway saving device of exchanger {APPARATUS FOR REDUCING SUBHIGHWAY OF EXCHANGE}

The present invention relates to a subhighway reduction apparatus of an exchange, and more particularly, to an apparatus for reducing a subhighway used in an announcement broadcast apparatus and a dual tone multi frequency (DTMF) receiving apparatus of an exchange.

1 is a block diagram showing an embodiment of a subhighway use of a switch according to the prior art, which includes a local and global service interface (LGSI) control unit 101, a guide broadcast unit 102, and a DTMF unit ( 103, and a time switch 104.

In the figure, the upper call processing software sends a command to the local and global service interface control unit 101 via an external bus to send an announcement message to a specific subscriber.

The local and global service interface control unit 101 is a channel of the announcement broadcasting unit 102, for example, the announcement broadcasting unit 102 via the local bus to transmit the necessary announcement broadcast through the available channel of 128 channels when accepting 32K subscribers Instruction in memory. The local and global service interface control unit 101 manages the available channels by checking the memory periodically to determine whether the channel for 128ch is in use or idle.

For example, the announcement broadcaster 102 searches a memory for 128 channels every 128 ms and drives a circuit inside when there is a message sending command in a corresponding channel, and then through a corresponding time slot, that is, a corresponding channel of a subhighway. The requested announcement message is transmitted to the time switch 104. The announcement broadcaster 102 transmits the announcement broadcast message to the time switch 104 and writes information 'in transmission' to the memory and notifies the local and global service interface controller 101 to the memory. 'In the memory, so that the local and global service interface control unit 101 can manage the channel state.

The higher call processing software controls the time switch 104 to switch the channel received from the announcement broadcaster 102 to the channel to which the necessary subscriber is connected so that the subscriber can listen to the necessary announcement broadcast message.

Referring to the operation of the DTMF unit 103, when the subscriber presses the DTMF digit, the call processing software recognizes this and switches the time switch 104 so that this signal is received by the DTMF unit 103, and the local and global service interface. The control unit 101 instructs DTMF reception on which subhighway several channels. At this time, the local and global service interface control unit 101 manages the channel of the DTMF unit 103 to give information to the upper call processing software so that the DTMF signal is switched to the available channel.

The local and global service interface control unit 101 informs the DTMF unit 103 that a DTMF signal is received in a channel through a local bus.

The DTMF unit 103 can find this information by periodically searching the internal local bus matching memory. When this information is received, the DTMF unit 103 controls the internal circuit (DTMF detector) to detect the digit information, and the detection result is local again. It writes to the bus matching memory and reports the result to the local and global service interface control unit 101.

Looking at the operation of the announcement broadcast unit 102 and the DTMF unit 103 can be concluded as follows.

The local and global service interface control unit 101 controls the announcement broadcasting unit 102 and the DTMF unit 103 and manages states such as available and unavailable for each channel. For the actual service, the announcement broadcasting unit 102 only transmits a message, and the DTMF unit 103 only receives DTMF signals. That is, it can be seen that the announcement broadcaster 102 needs only the transmission subhighway, and the DTMF unit 103 only needs the reception subhighway.

However, when looking at all the conventional exchanges, it can be seen that the transmission / reception subhighway is simultaneously present in each of the announcement broadcasting unit 102 and the DTMF unit 103 as described above. The reason there are both transmit / receive subhighways is that the exchange has automatic maintenance of all devices, checking the function of each device periodically (typically three minutes). That is, the announcement broadcast unit 102 is periodically tested by one channel every three minutes, and if the result is 'NOK', a fault message is displayed through the operator terminal, and the DTMF unit 203 is also the same.

In the case of the DTMF unit 103, the DTMF unit 103 has a transmitting device. When the DTMF signal is transmitted through the channel of the corresponding transmission subhighway, the time switch 104 loops back and again through the receiving subhighway. It is received by the DTMF unit 103. The DTMF unit 103 detects this and reports it to the local and global service interface control unit 101, and the local and global service interface control unit 101 reports this information to the upper operation maintenance software at the time of 'NOK' to the operator terminal. Allow display

Since the loopback test of the announcement broadcast unit 102 cannot detect an abnormality by receiving the announcement message, an arbitrary test pattern signal (AA or channel number) is transmitted and looped back by the time switch 104. The data is detected and the result is reported to the local and global service interface control unit 101. The local and global service interface control unit 101 reports the result to the upper maintenance software when the result is 'NOK' and is displayed on the operator terminal. .

As such, the announcement broadcasting unit 102 and the DTMF unit 103 periodically perform a loopback test for each channel under the control of the local and global service interface control unit 101, and the local and global service interface control unit 101 performs the device 102. , The channel currently in service is controlled so as not to perform the test. In addition to the periodic automatic test, the operator can perform the test to the operator terminal if necessary, and the time switch 104 loopback test is also performed.

Because of the above operational maintenance functions, both the transmitting and receiving subhighways are assigned to the announcement broadcasting unit 102 and the DTMF unit 103 accommodated in the access switching subsystem (ASS-S) of the exchange. .

This configuration results in a shortage of subhighways in the case of large matching exchange subsystems or when configured as a matching exchange subsystem used for a specific purpose, especially for embedded intelligent peripherals (IP). If the channel accommodates 512 channels, DTMF requires 1024 channels.

If the unnecessary use of such subhighway can be effectively used, the structure design of the switchboard can be effectively performed, and thus, in case of a transmission or reception-only device such as the announcement broadcasting unit 102 and the DTMF unit 103, the subhighway is provided through the present invention. Reduced to half to have an efficient exchange structure.

An object of the present invention is to provide a subhighway reduction apparatus of an exchanger that reduces a subhighway that is matched with a time switch in an announcement broadcasting unit and a DTMF unit of an exchanger.

In order to achieve the above object, the present invention provides a sub-highway saving apparatus of an exchanger including a guide broadcast unit and a time switch connected to the DTMF unit through a subhighway: the guide broadcast unit is configured to perform a guide broadcast transmission function. A broadcast transmitter; A first time slot controller for providing a subhighway enable signal corresponding to a specific time slot; A first output controller configured to provide an output of the announcement broadcast transmitter to the subhighway according to a subhighway enable signal of the first time slot controller; A loopback test detection unit performing a loopback test function; A second time slot controller for providing a subhighway enable signal corresponding to a specific time slot; And a second output controller configured to provide a signal provided through the subhighway to the loopback test detection unit according to the subhighway enable signal of the second time slot controller.

1 is a block diagram showing one embodiment of subhighway use of an exchange according to the prior art;

Figure 2 is a block diagram showing an embodiment of a subhighway saving device of the exchange according to the present invention;

3 is a block diagram illustrating an embodiment of an announcement broadcast unit and a DTMF unit shown in FIG. 2;

4 is a block diagram illustrating an embodiment of a time slot controller illustrated in FIG. 3;

5 is a timing diagram illustrating the operation of FIG. 4.

<Description of the symbols for the main parts of the drawings>

201: local and global service interface control unit

202: announcement broadcasting unit

203: DTMF part

204: time switch

301 and 311: first and second local bus memory

302, 312: first and second central processing unit

303: announcement broadcasting unit

304: loopback test detection unit

305, 306, 315, and 316: first to fourth time slot controllers

307, 308, 317, and 318: first to fourth output control units

313: DTMF sending part

314: DTMF detection unit

401: latch portion

402: data conversion unit

Hereinafter, the embodiment of the present invention will be described in detail with reference to the following drawings.

Figure 2 is a block diagram showing an embodiment of a sub-highway saving apparatus of the exchange according to the present invention, a local and global service interface control unit 201, announcement broadcast unit 202, DTMF unit 203, and time switch 204 It consists of.

3 is a block diagram illustrating an exemplary embodiment of the announcement broadcast unit 202 and the DTMF unit 203 shown in FIG. 2. The announcement broadcast unit 202 may include a first local bus memory 301 and a first central processing unit. Processing Unit (CPU) 302, announcement broadcast transmitter 303, loopback test detector 304, first and second time slot controllers 305 and 306, and first and second output controllers 307 and 308. ). The DTMF unit 203 includes the second local bus memory 311, the second central processing unit 312, the DTMF sending unit 313, the DTMF detecting unit 314, and the third and fourth time slot control units 315 and 316. And third and fourth output control units 317 and 318.

In the figure, the first central processing unit 302 in the usual announcement broadcasting unit 202 periodically searches the first local bus memory 301 so that the channel with the announcement command is '0', and the idle channel is The first time slot controller 305 is set to '1' and the announcement service is performed for all channels. At this time, if there is no channel for the loopback test command, the second time slot controller 306 sets all of them to '1'.

Normally, the second CPU 312 of the DTMF unit 203 periodically searches the second local bus memory 311 so that the channel having the DTMF reception command is '0' and the idle channel is '1'. The time slot control unit 316 is set and DTMF detection service is performed for all channels. At this time, if there is no channel for the loopback test command, the third time slot controller 315 sets all of them to '1'.

In this state, only the channel during the announcement broadcast transmission service is enabled in the transmitting subhighway, only the channel in the DTMF signal processing is enabled in the receiving subhighway, and all other channels are disabled.

At this time, when the loopback test request is received on any channel by the announcement broadcasting unit 202 and the loopback test request is simultaneously received on any channel by the DTMF unit 203, the operation is as follows. In this case, a loopback test request is made to both devices 202 and 203 by the local and global service interface control unit 201, and the local and global service interface control unit 201 is in a state for all channels of the two devices 202 and 203. It does not require a loopback test on the same channel at the same time.

First, the first central processing unit 302 in the announcement broadcasting unit 202 searches the first local memory 301 to recognize the announcement broadcasting service and the loopback test request for any of several channels, and thus the channel for the announcement service. Sets '0' to the first time slot controller 305 and '0' to both the time slot controller 305 and the time slot controller 306 for the loopback test request channels.

Thereafter, when the announcement broadcasting service and the loopback test data transmission and detection function are performed, the announcement message is transmitted to the subscriber through the transmission subhighway, and the loopback test data is transmitted through the transmission subhighway, and thus, at the time switch 204. It is looped and received over the receive subhighway. At this time, the DTMF reception channel for the channel is idle, that is, the fourth output control unit 318 is three-state, so there is no fear of data collision. Therefore, the local and global service interface control unit 201 may be notified of this result.

At the same time, if a DTMF loopback test request is received for any channel that does not have a guide broadcast transmission occupancy (guide broadcast transmission channel or guide broadcast loopback test request channel) in the DTMF unit 203, the second central processing unit of the DTMF unit 203 ( 312 sets the fourth time slot control unit 316 to '0' for the DTMF receiving service channel, and sets the fourth time slot control unit 316 and the third time slot control circuit 315 to the DTMF loopback test request channel. Set to 0 '.

Thereafter, when the DTMF detection service and the loopback test data transmission and detection function are performed, the original DTMF signal is received from the subscriber, and the loopback test data is transmitted by the transmission time switch 204 through the enabled third output control unit 317. It is received through the fourth output control unit 318 which is looped and enabled through the receiving subhighway. Similarly, since the third and fourth output control units 317 and 318 of the announcement broadcast are all disabled in the tri-state for the corresponding channel, there is no fear of data collision.

4 is a block diagram illustrating an embodiment of the first to fourth time slot controllers 305, 306, 315, and 316, and includes a latch unit 401 and a data converter 402.

In the same figure, the latch unit 401 latches the presence / absence information for each channel from the central processing unit.

The data converter 402 converts the parallel data output of the latch unit 401 into serial data according to the frame synchronization as shown in FIG. 5A and the SQ2 signal as shown in FIG. 5B, and outputs a subhighway enable signal as shown in FIG. 5C.

Each of the first and second central processing units 302 and 312 of the announcement broadcasting unit 202 or the DTMF unit 203 periodically searches the first and second local bus memories 301 and 311 for each channel. Before the command is executed, the command information for each channel is received and the channel being used is '0' and the channel not being used is '1' and the information is stored in the latch unit 401 of FIG. 4. At this time, the size of the latch unit 401 is equal to the channel capacity. In other words, if it is 64 channels, it becomes 64 bits.

2) At the moment of storing the information, this information is applied to the input of the parallel / serial converter.

3) Since the parallel / serial converter uses 125us of frame synchronization signal as the STLD signal and the SQ2 signal of one channel, that is, one time slot, is used as the clock signal, the parallel / serial converter outputs the corresponding time slot. If it is in use, the signal 'high' is time-multiplexed if it is not in use.

4) This signal is used as a control signal of the three-state buffer for transmission and reception of announcement and DTMF devices.

Next, when the time slot control circuit according to the present invention configured as shown in Fig. 4 is applied to the announcement broadcasting device and the DTMF device as shown in Fig. 3), the operation is particularly performed. Explain how it works.

The present invention is focused on the fact that the announcement broadcast apparatus of the exchange is a transmission-only device and the DTMF detection device is a reception-only device, and can be applied to an intelligent peripheral device built in a switch related to an intelligent network.

As described above, the present invention saves the subhighway matched with the time switch 204 in the announcement broadcasting unit 202 and the DTMF unit 203 of the exchange. Therefore, the sub-highway is reduced by half while maintaining the maintenance functions of the announcement and DTMF devices, thereby reducing the cable and maximizing the capacity of the time switch 204.

Claims (2)

In the sub-highway reduction apparatus of the exchanger having a time switch which is connected through the sub-way with the announcement broadcasting unit and the DTMF unit: The guide broadcast unit may include: a guide broadcast transmitter for performing a guide broadcast transmission function; A first time slot controller for providing a subhighway enable signal corresponding to a specific time slot; A first output controller configured to provide an output of the announcement broadcast transmitter to the subhighway according to a subhighway enable signal of the first time slot controller; A loopback test detection unit performing a loopback test function; A second time slot controller for providing a subhighway enable signal corresponding to a specific time slot; And a second output controller configured to provide a signal provided through the subhighway to the loopback test detection unit according to the subhighway enable signal of the second time slot control unit. The method of claim 1, The DTMF unit includes a DTMF sending unit that performs a DTMF sending function; A third time slot control unit providing a subhighway enable signal corresponding to a specific time slot; A third output controller configured to provide an output of the DTMF transmitter to the subhighway according to a subhighway enable signal of the third time slot controller; A DTMF detection unit performing a DTMF detection function; A fourth time slot controller for providing a subhighway enable signal corresponding to a specific time slot; And a fourth output control unit providing a signal provided through the subhighway to the DTMF detection unit according to the subhighway enable signal of the fourth time slot control unit.