KR200174925Y1 - Isdn-nt extracting timing source from u-interface signal - Google Patents

Abstract

The present invention provides a connection device by synchronizing the transmission device with a synchronization clock extracted from a U-connection signal of a tester or an exchanger for relaying the service of the ICT to a subscriber of a remote station without an ICT switch. It is possible to quickly test and repair the relay section, and the manufacturer is characterized by a built-in synchronous circuit to establish the environment for quality inspection.

Description

ISDN-NT extracting timing source from U-interface signal

The present invention relates to a synchronization circuit using a connection signal, and more particularly, to provide a synchronization circuit that can extract a synchronization clock from the connection signal without supplying the synchronization clock to the transmission device of the integrated information communication network relay section. It's about IS-DENT.

Generally, the conventional IS-ENT used for the ICT relay section

As shown in FIG. 1, the U-connection signal is input from the connector 1 and passes through the primary surge protection unit 6 and the test port unit 10, and then passes through the secondary surge protection unit 9. Input to the connection signal matching unit 7 and after the extraction / playback in the connection signal transmission / reception unit 8 to the field programmable gate array (4) for processing as a signal to be sent to the common unit of the transmission device It has a structure which is inputted and outputted to the connector 1 via the buffer unit 2, and does not have a synchronization circuit for extracting a synchronization clock from the U-connected signal.

The network configuration and test configuration of the conventional IS-ENT is set to the external clock reception mode by setting the comprehensive information communication network tester 12 having the external clock transmission / reception function in the switching center 11 as illustrated in FIG. The synchronization clock 15 output from the transmission device 13 is connected to the tester 12 to synchronize the transmission device 13. In another method, the tester 12 may be set to an external clock transmission mode so that the synchronous clock 15 output from the tester 12 may be connected to the transmission device 13 to synchronize.

In addition, in order to synchronize the transmitter 18 of the remote station 17, the transmitter 18 can be set. In the new clock mode, the transmission devices 13 and 18 of the relay section can synchronize.

After the tester 12 and the transmission devices 13 and 18 are synchronized, the time-division multiplexing is carried out by the transmission device 13 when the connection signal 16 of the tester 12 is inputted to the TS-ENT 14. And a pulse code modulation to be transmitted to the transmission device 18 of the remote station 17, and the U-connection signal 20 through the demultiplexing process of the transmission device 18 and the IS-DL 19. It is restored to and sent to the network termination device 22 of the subscriber (21). This series of procedures enables the testing of the connected signal from the tester 12 to the network termination device 22 of the subscriber 21.

Therefore, synchronization of the transmission device is essential to test the relay section, and only a tester 12 having an expensive external clock transmission or reception function can be used to test the relay section. In addition, small and medium-sized manufacturers who do not have a tester 12 with external clock transmission / reception functions due to economic burden do not provide the synchronous clock 15 in the exchange office 11, so that the transmission device, ISD-ENT and I We couldn't have the environment to test SD-LTI.

The object of the present invention was achieved in view of the above-described problems of the prior art, and an object of the present invention is to implement a test for a relay section of an integrated information communication network and a connection of an exchange by using a tester without an external clock transmission / reception function. It is to provide a test and development environment for small and medium manufacturers by extracting the synchronous clock to be supplied to the transmitter from the signal.

In order to achieve the above object of the present invention, the synchronization circuit unit according to the present invention compares the components of an input signal to generate a clock, which is fed back to the division circuit in the field programmable gate array and finally generated. The synchronous clock is output externally through the connector. By inputting the externally output synchronous clock into the synchronous clock input terminal of the transmission apparatus, the transmission apparatus can be synchronized with the connected-connection signal of the integrated information network tester.

1 is a diagram illustrating the internal structure of a conventional IS-ENT

Figure 2 is an illustration showing a test method of a conventional embodiment

Figure 3 is a diagram of the internal structure of the IS-Den-ent according to the present invention

4 is a detailed structural diagram of the embodiment

5 is an exemplary view showing a test method of the embodiment

<Brief description of the main parts of the drawings>

1 ----- Connector 2 ----- Buffer

3 ----- Clock Oscillator 4 ----- Gate Array

6 ----- Primary surge protection unit 7 ----- U-connection signal matching unit

8 ----- U-connection signal transmission / reception part 9 ----- Secondary surge protection part

10 ----- Test port part 11 ----- Exchange station

12 ----- Testing Machine 13 ----- Transmission

14 ----- IS-DENT-ANT 19 ----- IS-DENT-LT

22 ----- Network termination device 24 ----- Synchronous circuit part

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

The configuration of the present invention is described with reference to FIG. 3 to synchronize the transmission device using the U-connection signal of the integrated information communication network tester, and the U-connection signal is input from the connector 1 to provide a primary surge protection unit ( 6) through the test port unit 10 and again through the secondary surge protection unit 9 to the U-connection signal matching unit 7, the matched signal is connected to the U-connection signal transmission / reception unit 8 ) Is input to the field programmable gate array 4 through a process of extracting / reproducing the connected signal from the inside.

The clock divided and output by the internal circuit of the field programmable gate array 4 is input as one input signal of the synchronization circuit 24, and the clock generated by the clock oscillator 3 is input to the field programmable gate array 4; It is divided by the other internal circuit of and is input as the other input signal of the synchronization circuit section 24.

The synchronizing circuit section 24 generates a clock by comparing the components of the two input signals, which are fed back to the division circuit inside the field programmable gate array 4. Finally, the generated synchronous clock is output to the outside through the connector (1). By inputting the externally output synchronous clock into the synchronous clock input terminal of the transmitter, the transmitter can be synchronized with the U-connection signal of the ICT network tester.Built-in synchronous circuit allows economical without external clock transmission / reception function. Inexpensive tester makes it easy to test and maintain the relay section of the ICT network, and even a manufacturer who does not receive a synchronous clock can have a development environment.

The synchronization circuit unit 24 will be described in more detail with reference to FIG. 4. The U-connection signal inputted to the clock extraction / dividing unit 25 is synchronized via the PEL circuit unit 30 from the clock extraction / dividing unit 25. One comparison clock for generating a clock is output and input to one input terminal of the PLL circuit unit 30. As another clock for comparison in the PEL circuit unit 30, the clock generated by the clock oscillator 28 is divided in the division circuit unit 27 and input to the PEL circuit unit 30. The PEL circuit unit 30 compares the input signals of two input components and feeds them back to the division circuit unit 31 so that the outputted clock can be synchronized.

Through the feedback process described above, it is finally output as a synchronous clock through the transmission driver 32, and the clock can be synchronized with this clock.

On the other hand, in order to control the generation and prohibition of the synchronous clock from the U-connection signal of the integrated information communication network, the AND circuit 29 receives the clock output from the clock extraction / dividing section 25 and the control signal output from the control section 14. When input to, the output signal combined by the AND circuit 29 is input to the PEL circuit unit 30. The control unit 26 selects so that the user can control it arbitrarily. Designed and controlled by position 5 or central processing unit. The synchronous clock generated by the PLL circuit unit 30 converts the signal into a signal component that can be matched to the transmission device by the transmission driver 32 and transmits it.

According to the constitution of the present invention, since the transmission apparatus can be synchronized using only the connection signal of the exchanger of the integrated telecommunication network or the tester without the external clock function, the operator of the optical transmission room of the integrated telecommunications network switching station can operate the external clock function. Economical low-cost tester can test the relay section of the connected signal, speed up the service and maintenance to the subscriber, and even if the manufacturer cannot receive the synchronous clock, the transmission device by the exchanged signal of the exchange alone Because it can be motivated, it is effective to implement quality inspection environment.

Claims (1)

The U-connection signal is input from the connector and input to the U-connection signal matching unit through the primary surge protection unit, the test port unit and the secondary surge protection unit, and the extraction / regeneration process is performed at the U-connection signal transmission / reception unit. In the die-entry used in the general information communication network relay section having a configuration that is input to the field programmable gate array for processing as a signal to be sent to the common part of the transmission device, and is output to the connector through the buffer unit, IS-DENT with a built-in synchronization circuit that enables the generation or prohibition of a synchronous clock for the test implementation of the connected-connection signal relay section of the integrated information communication network using a tester without an external clock transmission or reception function.