KR900005165B1 - Initial method for exchanges - Google Patents

Abstract

The system has a relay line control processor (10), a matching circuit (20), a multiplexer (30), a switching device (40), a multi- freqnency interface crcuit (50), and a tone generator (60). The process for connecting an idle code comprises the following steps: (a) seting up the number of time slots and geting a first time slot, (B) verifying the sub-highway of the time slot and insertingthe idle code at 16th time slot, (c) decreasing the number of time slot count by increasing the time slot point, and (d) carrying out the second and third steps continuously until all inspection of time slots is finished, and closing the initiallization process for inserting the idle code.

Description

How to Connect Idle Codes During Relaying Between Electronic Switching Stations

1 is a system diagram for carrying out the present invention.

2 is a flow chart of the present invention.

3 is a diagram of trunk lines during call connection and disconnection.

4 is a sub highway of the trunk line concentrator.

* Explanation of symbols for main parts of the drawings

10: trunk line control processor 20: digital trunk line matching device

30: relay line concentrator 40: switching device

50: multi-frequency signal matching device 60: tone generator

The present invention relates to a method of inserting an idle code of an all-electronic exchange, and more particularly to a method of inserting an idle code for a corresponding method in an all-electronic exchange capable of using both a 24-channel and a 32-channel scheme. will be.

In PCM type electronic switch, 24 channel type is North Ametica, and the number of time slots of one frame is 24 time slots and μ-law Companing type is used. 32 channel type is CEPT (Conference) A-law companding method is used as European de Postes of Telecommunication. At this time, the idle code is carried on the idle channel and the frame and signaling channel that does not contain the actual data.The channel containing the idle code is not switched with the relay call and the call that was being performed during system initialization or call. When disconnected, an idle code is inserted into each corresponding time slot to transmit a corresponding channel to an idle channel on a sub highway. At this time, in the related art, the all-electronic exchanger was fixed in the NA method or the CEPT method, and when the inter-country relay was inserted, the idle code used a method of connecting the 16 timeslots of a specific sub highway. At this time, the idle code of the CEPT method is 54H (01010100), and the idle code of the NA method is 7FH (01111111). However, in the current all-electronic exchange, a digital trunk line matching device serving a NA version and a digital trunk line matching device serving a CEPT version can be used in combination.

Therefore, each digital trunk line matching device may perform trunk line service in a corresponding manner, but the trunk line control processor must be able to service both the NA method and the CEPT method.

Therefore, when the relay line processor inserts an idle code in the electronic switch using a specific method (NA or CEPT method) as described above, since the 16 timeslots of a specific sub highway are unconditionally connected, the service method of the large switching center is not considered. There was a problem that the quality of service was deteriorated by sending idle code of a foreign country.

Therefore, an object of the present invention is to provide a method capable of inserting an idle code suitable for the type of exchange in the NA and CEPT dual electronic exchange.

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

1 is a system diagram for carrying out the present invention, a digital relay line matching device 20 for matching with data input through a digital relay line from a relay station control processor 10 power station for controlling and processing relay calls between stations, and the relay line control. A switching device 40 for switching the output of the relay line concentrator 30 and the output of the relay line concentrator 30 and the output of the system under the control of the processor 10 to form a path of data and a beep; , The multi-frequency signal interface device 50 for outputting a signaling signal generated by DTMF (Dual Tone Multi-Freguency) to the relay line concentrator 30, and a relay line concentrator for various digital tone signals. It consists of the tone generator 60 which outputs to 30. As shown to FIG.

2 is a flow chart according to the present invention, after setting the number of timeslots to be processed and obtaining a first timeslot, and a corresponding time after performing the first steps (a) and (b). A second step (c) (d) (e) (f) of identifying a subhighway of the slot and connecting the 16th timeslot of the corresponding subway to insert an idle code of the corresponding method; After the third process (g) (h) and the third process (g) (h), the time slot pointer is increased and the number of timeslot counts is increased after performing (d) (e) (f). A fourth process (i) is performed to check whether the time slot has been checked and to return to the second process if not, and to terminate and return the initialization process for inserting idle code upon completion of the check.

FIG. 3 is a general call processing diagram, and FIG. 3 (a) connects voice and data coming from the other station through the digital relay line matching device 20 and the trunk line concentrator 30 to the inside of the system through the switching device 40. And the voice data output from the subscriber of the own station is transmitted to the counter station through the relay line concentrator 30 and the digital relay line matching device 20 after passing through the switching device 40.

FIG. 3 (b) is a state diagram at the time of call disconnection. In this case, since the timeslot is in the idle state, the 16th timeslot of the sub highway corresponding to the timeslot is connected. Therefore, if the counterpart exchange is a CEPT exchange, the digital trunk line matching device 20 also matches the relay line with the CEPT scheme, and as a result, the 16th timeslot is connected from the subhighway of the timeslot with the idle code of the timeslot. The 54PT CEPT idle code is inserted and sent back to the destination exchange. In addition, if the counterpart switching center is the NA method, the digital relay line matching device 20 also matches the relay line with the NA method. As a result, the NA method idle code of 7FH is inserted into the idle time slot and transmitted to the counterpart switching center as described above. do.

4 is a diagram illustrating the sub highway layout of the relay line concentrator 30, and in the case of the relay line concentrator 30, up to five digital relay line matching devices 20 may be connected.

The present invention will be described in detail with reference to FIGS. 1, 2, 3, and 4 based on the above-described configuration.

The electronic switching system includes a trunk line control processor 10, which is a high level processor, and a digital trunk line matching processor, which is a lower level processor, for processing between trunk calls. The digital trunk line matching processor is a 24 channel (NA Version) and 32 channel (CEPT) method. According to each type of version), only the processing according to the corresponding type may be performed, but the trunk line control processor 10 should be able to process both the 24 channel method and the 32 channel method or a mixture of both methods.

In the all-electronic switch which can be mixed with the 24-channel method and the 32-channel method, the digital relay line matching device 20 is configured according to the service method of the counterpart switching center, and the digital relay line matching device 20 outputs the counterpart switching device. It directly matches with the digital relay line that transmits and transmits the idle code according to the 24 channel type and 32 channel type to the 16 timeslot of each sub highway. Therefore, the relay line device of the electronic switchboard has a plurality of digital relay line matching devices, and each of the digital relay line matching devices operates exclusively of the 32 channel type or the 24 channel type. In addition, as shown in FIG. 4, a maximum of five digital trunk line matching devices 20 may be connected to one trunk line concentrator 30, and one digital trunk line matching device 20 may trunk trunks to four sub highways. It is connected to the device 30. Therefore, when the idle code is to be inserted in the electronic switch which uses the 24 channel type and the 32 channel type, it is not possible to connect the 16 timeslots of the specific sub highways, so the idle code of the digital relay line matching device 20 must be loaded. do.

The maximum number of sub highways input to the trunk concentrator 30 is 39 sub highways as shown in FIG. 4. In FIG. 4, five digital trunk line matching devices 20 each have four sub highways (5 × 4 = 20 sub highways) and 16 sub highways output from the switch device 40, two sub highways output from the multi-frequency signal matching device 50, and one sub highway output to the tone generator 60 are inputted accordingly. To the highway.

In the general call processing, as shown in FIG. 3 (a), voice data from the other station is input to the trunk line concentrator 30 through the digital trunk line matching device 20, and the trunk line concentrator is used by the relay line control processor 10. When address data of the timeslot to be switched is written to the control memory of 30, voice data are exchanged through the switching device 40 and then sent to the subscriber side. At this time, when disconnecting the call by disconnecting the call as shown in FIG. 3 (b), the idle code from the 16th time slot of each sub highway of each digital trunk line matching device 20 is connected to the corresponding time slot of the call cutting. When the control memory is initialized, the idle code of the 16th time slot is directly connected to each sub highway connected to the digital trunk line matching device 20 and the trunk line concentrator 30, so that the 24 channel method and the 32 channel method can be used. The trunk line control processor 10 processes so that both can be used.

In addition, the multi-frequency signal matching device 50 inputs a DTMF signal of the subscriber and outputs an R2 signal such as a seizure and a recovery to the relay line concentrator 30 through two sub highways, and generates a tone. The device 60 outputs a signal tone such as busy tone, ringing tone, ring back tone, etc. to the relay line concentrator 30 through one sub highway according to the state of the call. When initializing the control memory at system initialization, the flow of the present invention for directly connecting the idle code of the 16th time slot of each sub highway from each digital trunk line concentrator 20 to the corresponding time slot proceeds as follows.

First, in step (a), the relay line control processor 10 sets the total number of timeslots processed by the relay line concentrator 30, which is a switching device 40, a digital relay line matching device 20, and the like. 32 time slots are calculated and set in the number of sub highways of the frequency signal matching device 50 and the tone generating device 60. If the total number of timeslots processed by the trunk concentrator 30 is set in step (a), the first time slot is taken from the total number of timeslots set in step (b) to start the initialization process. That is, in step (c), the trunk line control processor 10 obtains the sub highway number of the corresponding timeslot using the corresponding timeslot signal output from the digital trunk line matching device 20. Since one sub highway is composed of 32 timeslots, dividing the current timeslot number by 32 may obtain the subhighway number of the corresponding timeslot. Subsequently, the process proceeds to step (d) to designate the 16th channel number of the sub highway as the control memory address of the relay line concentrator 30.

The 24-channel and 32-channel idle codes recommended by the International Telegraph Advisory Committee (CCITT) are different.The 32-channel (CEPT) is 54H (01010100) and the 24-channel (NA) is 7FH (01111111). . In addition, since the digital relay line matching device 20 outputs an idle code of a 24-channel method or a 32-channel method to the 16th time slot, the relay line control processor 10 outputs an arbitrary time slot to the 16th time of the sub highway belonging to the corresponding time slot. By switching to the contents of the slot, you can insert an idle code that matches the method.

After the relay line control processor 10 designates the 16th timeslot number of the corresponding sub highway to enter the control memory in step (D), the pad data indicating the efficiency on the transmission line to the idle code in step (e). Add) Subsequently, when the selected timeslot number + pad data is written to the control memory in step (f), the contents of the timeslot is switched to the contents of the 16th timeslot of the subhighway by the relay line concentrator 30 so that the idle code is the timeslot. Is connected to. When the idle code is connected to the corresponding timeslot, in step (g), the pointer of the timeslot is increased to initialize the next timeslot, the count of the total timeslot set in step (h) is decreased, and in step (i) Check whether the initials of all the timeslots that have been set have been performed. If the initials are being initialized, go back to step (c) and perform the initials for the next timeslot.

Through the above process, the initialization process for idle code connection is performed for all timeslots set in step (a).

When the call is generated through the counterpart exchanger and the relay line after performing the initialization process as described above, the call connection is established as shown in FIG. 3 (a), and the voice data is exchanged between the own station and the counterpart station. When the call is cut or idle code connection is required, the idle code is connected to the control memory of the relay line concentrator 30 by writing the 16th time slot number of the sub highway to the corresponding time slot number. Therefore, it can be seen that the CEH idle code of 54H is connected when the counterpart exchanger is the CEPT method, and the NA idle code of 7FH is connected when the NA method is used.

As described above, when the idle code is connected to the frame signaling channel and the idle channel, the 16th time slot of the corresponding sub highway of the digital relay line matching device is directly connected to insert the idle code, thereby performing PCM 24 channels during the relay line processing. There is an advantage in that an appropriate idle code can be connected to each method in an all-electronic exchange that uses a method and a 32 channel method or a combination of both methods.

Claims (1)

In the method of connecting idle codes in inter-station relay in an electronic switch, first steps (a) and (b) of setting the total number of timeslots to be processed and bringing the first timeslot, and the first steps (a) ( b) a second process (c) (d) (e) of obtaining a subhighway number of the corresponding timeslot using the corresponding timeslot number and connecting the 16th channel of the corresponding subwayway with the idle code of the timeslot (f), a third step (g) (g) of increasing a timeslot pointer and decreasing a set number of timeslot counts after performing the second steps (c) (d) (e) (f), and After performing the third process (g) (h), it is checked whether or not the setting time slot has been checked. If the check is completed, the process returns to the second process, and if the check is completed, the fourth process (i) completes the idle code connection process. A method of connecting an idle cord during relaying between stations of an electronic switchgear.

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