KR200220587Y1 - Pulse Code Modulation Repeater - Google Patents

Abstract

1. Technical Field

The present invention relates to a pulse code modulated repeater.

2. The technical problem the invention is trying to solve

The object of the present invention is to provide a repeater which can be used as a pulse code modulated repeater of the European method (E1) by changing the pulse code modulated repeater used in the North American method (T1) by employing a minimum number of functional elements. have.

3. Summary of solution of design

The present invention, the first signal transmission means for delivering a pulse signal received from the repeater; Signal identification and compensation means for identifying a frequency band of the pulse signal transmitted through said first signal transmission means, and then compensating for said pulse signal; Second signal transfer means for transferring the pulse signals transmitted from the signal identification and compensation means to the exchange; Pulse comparison means for continuously monitoring the bipolar waveform transmitted through the signal identification and compensation means and receiving a predetermined clock extracted from the identification and compensation means to compare no signal or pulse error rate; Fault detecting means for detecting a signal in which a fault has occurred in the pulse signal transmitted from said pulse comparing means; An alarm generating means for lighting a warning LED (Light Emitting Diode) by a relay contact when a failure occurs in a signal transmitted from the repeater to the exchange, and for supplying a power failure due to a blown fuse; A warning for comparing an error detection signal transmitted from the error detection means with a clock of the signal identification and compensation means to transmit an alarm to the alarm generation means at a pavilion or loss of synchronization and to propagate the warning to another repeater. Control means; Third signal transfer means for transferring a pulse signal received in the unidirectional direction when receiving a bipolar waveform from the exchange and preventing a feed voltage from flowing into the exchange direction; And attenuation means for attenuating the pulse signal transmitted from the third signal transmission means by selecting whether to use an attenuator according to the distance between the exchanger and the repeater.

4. Important uses of the devise

The present invention is used for the pulse code modulation repeater of the European method.

Description

Pulse Code Modulation Repeater

The present invention relates to a pulse code modulation (PCM) station repeater.

In general, pulse code modulation (PCM) transmission determines whether there is a pulse in each time slot of a transmitted pulse string, and reproduces the pulse string exactly in time like the received pulse string, and sends it to the next transmission path. .

T1, the North American method of the PCM repeater, is a basic format of the T-carrier pulse code modulation transmission system used in North America and has a transmission facility for DS1 signals. T1 is a time-division multiplexed format of 24 telephones or data channels within a single 1.544 Mbps data stream, and when used with a digital relay, it can transmit up to about 200 KM over two pairs of cables. The T1 format provides 64 Kbps channels for each data line, where the PCM voice channels consist of 8-bit samples sampled at 8 KHz and have a 64 Kbps data rate. This T1 combines 24 multiplexed DS0 channels with one framing bit to form one frame of 1.544 Mbps and transmits 193 bits of 8 KHz every frame.

However, in the case of the PCM repeater of the North American type as described above, the PCM transmission repeater is replaced with the optical transmission facility due to the replacement of the PCM transmission facility and the mother-to-country transmission path facility, but the PCM repeater is dead even though the performance of the PCM repeater is very high. There was a problem.

Accordingly, the present invention has been devised to solve the above problems, and the pulse code modulation repeater used in the North American method (T1) is adopted as the pulse code modulation repeater of the European method (E1) by employing minimal functional elements. Its purpose is to provide a usable repeater.

1 is a block diagram of an embodiment of a pulse code modulation repeater according to the present invention;

Figure 2 is a circuit diagram of one embodiment of a pulse code modulation repeater according to the present invention.

Explanation of symbols on the main parts of the drawings

10: first signal transmission unit 20: signal identification and compensation unit

30: second signal transfer unit 40: pulse comparison unit

50: failure detection unit 60: warning generation unit

70: warning control unit 80: third signal transmission unit

90: attenuation part 100: first protection part

110: second protection unit 120: voltage transfer unit

130: voltage conversion unit 140: remote loop circuit

In order to achieve the above object, the present invention provides a pulse code modulation station for transmitting and receiving a signal between a repeater and an exchanger, comprising: first signal transfer means for transferring a pulse signal received from the repeater; Signal identification and compensation means for identifying a frequency band of the pulse signal transmitted through said first signal transmission means, and then for compensating said pulse signal; Second signal transfer means for transferring the pulse signal transmitted from the signal identification and compensation means to the exchange; Pulse comparison means for continuously monitoring the bipolar waveform transmitted through the signal identification and compensation means and receiving a predetermined clock extracted from the identification and compensation means to compare no signal or pulse error rate; Fault detecting means for detecting a signal in which a fault has occurred in the pulse signal transmitted from said pulse comparing means; Warning generating means for warning a light emitting diode (LED) by a relay contact when a signal transmitted from the repeater to the exchange is interrupted and for warning of a power failure due to a blown fuse; Comparing the fault detection signal transmitted from the fault detection means and the clock of the signal identification and compensation means to deliver an alarm to the alert generating means in the event of pavilion or synchronization of the waveform, and to propagate the alert to another repeater. Warning control means; Third signal transmitting means for transmitting the received pulse signal in a single direction when receiving a bipolar waveform from the exchange and preventing a feeding voltage from flowing into the exchange direction; And attenuation means for attenuating the pulse signal transmitted from the third signal transmission means.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention.

1 is a block diagram of an embodiment of a pulse code modulation repeater according to the present invention.

2 is a circuit diagram of an embodiment of a pulse code modulation repeater according to the present invention.

1 and 2, the pulse code modulation repeater according to the present invention is transmitted through a first signal transmission unit 10 and a first signal transmission unit 10 for transmitting a pulse signal received from a repeater. After identifying the frequency band of the pulse signal, the signal identification and compensation unit 20 for compensating the pulse signal, and the second signal for transferring the pulse signal transmitted from the signal identification and compensation unit 20 to the exchange Continuously monitors the bipolar waveform transmitted through the transmission unit 30 and the signal identification and compensation unit 20, and receives a predetermined clock extracted from the signal identification and compensation unit 20 to receive no signal or pulse error rate. The relay contact point when a failure occurs in the pulse comparison unit 40 for comparison, the failure detection unit 50 for detecting a failure signal in the pulse signal transmitted from the pulse comparison unit 40, and the signal transmitted from the repeater to the exchange. Sir by The LED (Light Emitting Diode) emits light, and a warning generator 60 is provided to warn that the power supply is disconnected due to a blown fuse, and a failure detection signal and a signal identification and compensation unit 20 are provided by the failure detector 50. Comparing the clock and transmitting the information to the alarm generator 60 in case of a pavilion or loss of synchronization, the warning controller 70 for propagating the warning to another repeater, and when receiving a bipolar waveform from the exchange, is transmitted in a single direction. And the pulse signal transmitted from the third signal transmitter 80 and the third signal transmitter 80 for transmitting the received pulse signal to prevent the feed voltage from flowing into the exchanger according to the distance between the switch and the repeater. An attenuator 90 is provided for selecting and using the attenuator.

In addition, the pulse code modulation station repeater of the present invention is connected between the repeater and the attenuation unit 90, and is provided for protecting the repeater from lightning (high voltage) suddenly generated by thunder or the like by being reversed by external conditions. 1 is a circuit connected between the protection unit 100 and the repeater and the first signal transmission unit 10, and a bipolar waveform is input to protect the repeater from lightning (high voltage) suddenly generated by thunder due to external conditions. Selects and connects the second protection unit 110, the voltage transmission unit 120 to select a predetermined power supply voltage applied from the outside, and transmits the power supply to the station repeater, and the power supply voltage applied from the outside to identify each signal. And a voltage converter 130 for converting the compensator 20, the pulse comparator 40, and the fault detector 50 into magnitudes of the driving voltages, and a pulse signal transmitted from the second signal transmitter 30. To, and to When generated, the pulse signal transmitted from the second signal transmission unit 30 is transferred to the third signal transmission unit 80 to loop to the power station by the relay contact, and the control signal transmitted from the warning control unit 90 is transmitted to a plurality of stations. It further includes a remote loop circuit 140 for transmitting to the repeater.

The signal identification and compensation unit 20 includes an automatic repeater 21 for transmitting a pulse signal transmitted from the first signal transfer unit 20 to the second signal transfer unit 30, and both ends of the signal repeater 21. The noise transmitted from the automatic repeater 21 connected between the connected crystal oscillator 22 and the power supply voltage 5V and the automatic repeater 21 is paralleled between the inductor 23 and one end of the inductor 23 and the ground. And capacitors 24 and 25 connected to block noise from the automatic repeater 21. Here, the automatic repeater 21 generates a clock by the crystal oscillator 22 and transmits the clock to the pulse comparator 40.

The pulse comparator 40 compares the first and second differential amplifiers 41 and 42 for amplifying the pulse signal transmitted from the automatic repeater 21 with the reference signal, and the signal identification and compensation unit 20 is automatically The comparator 43 for comparing the pulse signals transmitted from the first and second differential amplifiers 41 and 42 and the clock output from the automatic repeater 21 according to the clock signal transmitted from the repeater 21. Transmitting the logical product gate 44 for transmitting the clock output from the 43 and the automatic repeater 21 to the comparator 43, and the pulse signal output from the first differential amplifier 41 to the comparator 43 A logical product gate 45 and a logical product gate 46 for transferring the pulse signal output from the second differential amplifier 42 to the comparator 43.

The failure detector 50 detects and latches a clock according to a pulse signal transmitted from the comparator 43 of the pulse comparator 40 according to a time constant determined by the resistor R51 and the capacitor C51. A method for monitoring and latching an error in accordance with the pulse signal transmitted from the comparator 43 of the pulse comparator 40 according to the time constant determined by the multivibrator 51 and the resistor R52 and the capacitor C52. From the multi-vibrator 52, the counter 53 for counting the error detection period in accordance with the pulse signal transmitted from the comparator 43, from the pulse signal and the counter 53 output from the second multi-vibrator 52 An AND gate 54 for ANDing the output pulse signal;

An optical combiner 56 is provided by driving an alarm relay in accordance with a pulse signal transmitted from the third multivibrator 55 for outputting and latching an error generated through the AND gate 55.

The warning generator 60 includes a light emitting diode 61 controlled by the warning controller 70 to emit light.

The first protection part 100 includes a bridge circuit 101 and a three-pole lightning arrester 102.

The second protection unit 110 includes a bridge circuit 111 and a three-pole lightning arrester 112.

Referring to the operation of the repeater of the present invention having the structure as described above in detail as follows.

First, a process of transmitting a signal from a repeater to an exchange will be described.

When the pulse signal transmitted from the repeater is transmitted to the first signal transmission unit 10 through the second protection unit 110, the first signal transmission unit 10 receives the transmitted pulse signal signal identification and compensation unit 20 To pass. Subsequently, the signal identification and compensation unit 20 identifies the frequency band of the pulse signal transmitted from the first signal transmission unit 10 and then compensates for the attenuated pulse signal in the process transmitted from the repeater. The compensated pulse signal is transmitted to the second signal transmitter 30 and the pulse comparator 40.

The second signal transfer unit 30 transfers the pulse signal transmitted from the signal identification and compensation unit 20 to the exchange through the remote loop circuit 140. In addition, when the pulse comparison unit 40 compares the pulse signals transmitted from the signal identification and compensation unit 20 to the failure detection unit 50, the failure detection unit 50 generates no signal or a failure in the transmitted pulse signal. The signal is detected and transmitted to the warning control unit 70. Here, the no signal indicates a signal transmitted through the truncated transmission line, and the fault generating signal indicates a signal in which a fault occurs in the pulse signal transmitted from the repeater due to noise or the like.

When the warning control unit 70 transmits a no signal or a failure detection signal from the failure detection unit 50, the warning control unit 70 emits the light emitting diode 61 of the warning generation unit 60, thereby causing a failure in the relay station. It warns that it has occurred. In addition, the warning control unit 70 controls the warning generating unit of the other repeater through the remote loop circuit 140 to warn that a failure occurs in the authority repeater and the signal is not transmitted normally.

Next, a process of transmitting a pulse signal from the exchange to the repeater will be described.

When the signal transmitted from the exchange is transmitted through the remote loop circuit 140, the third signal transmission unit 80 transmits the transmitted pulse signal to the attenuation unit 90. Subsequently, the attenuator 90 attenuates the pulse signal transmitted from the third signal transmission unit 80 and transmits the attenuated signal to the repeater via the first protection unit 100. At this time, when the pulse signal transmitted from the third signal transmission unit 80 is more than the appropriate level, the user attenuates the pulse signal to the appropriate level by controlling the switches 91 to 94 of the attenuation unit 90. If the pulse signal of an appropriate level is transmitted from the third signal transmission unit 80, the attenuation unit 90 transmits the transmitted pulse signal to the repeater without attenuating it.

According to the present invention, as the PCM transmission facility between the domestic relay station and the mother-to-country transmission facility is converted to the optical transmission facility, and the exchange method is changed from the T1 level to the E1 level, the PCM repeater is largely dead. The new purchase of the unit can be suppressed and recycled for use, which can meet the demand, reduce the investment of the earth and earth, improve the transmission quality, and reuse the industrial waste without mass production again.

Although the technical idea of the present invention has been described in detail according to the above-described preferred embodiment, it should be noted that the above-described embodiment is for the purpose of description and not of limitation. In addition, those skilled in the art will appreciate that various embodiments are possible within the scope of the technical idea of the present invention.

As described above, the pulse code modulation repeater of the present invention employs functional elements such as an amplifier, a comparator, a counter, and a multivibrator in a pulse code modulation repeater used in the North American method (T1), thereby providing a comparator, a counter, and a multivibrator. By employing such functional elements, even when the parent-local transmission facility is replaced with the optical transmission facility, T1 can be reused without discarding, thereby greatly reducing the cost of installing E1.

Claims (6)

In the pulse code modulation station repeater for transmitting and receiving signals between the repeater and the exchange, First signal transmitting means for transmitting a pulse signal received from the repeater; Signal identification and compensation means for identifying a frequency band of the pulse signal transmitted through said first signal transmission means, and then for compensating said pulse signal; Second signal transfer means for transferring the pulse signal transmitted from the signal identification and compensation means to the exchange; Pulse comparison means for continuously monitoring the bipolar waveform transmitted through the signal identification and compensation means and receiving a predetermined clock extracted from the identification and compensation means to compare no signal or pulse error rate; Fault detection means for detecting an alarm signal in which a fault has occurred in the pulse signal transmitted from the pulse comparing means; Warning generating means for warning a light emitting diode (LED) by a relay contact when a signal transmitted from the repeater to the exchanger is interrupted, and for warning that the power supply is disconnected due to a blown fuse; Comparing the fault detection signal transmitted from the fault detection means and the clock of the signal identification and compensation means to deliver an alarm to the alert generating means in the event of pavilion or synchronization of the waveform, and to propagate the alert to another repeater. Warning control means; Third signal transmitting means for transmitting the received pulse signal in a single direction when receiving a bipolar waveform from the exchange and preventing a feeding voltage from flowing into the exchange direction; And And attenuating means for attenuating the pulse signal transmitted from the third signal transmitting means by selecting whether or not to use an attenuator according to the distance between the switch and the repeater. The method of claim 1, First protection means connected between the repeater and the attenuation means, for protecting the relay from the high voltage which is suddenly introduced by being reversed by external conditions; Second protection means connected between the repeater and the first signal transmission means and for protecting the relay from the high voltage suddenly generated by an external condition in a circuit in which a bipolar waveform is input; Voltage transmission means for selecting a predetermined power voltage applied from the outside and transferring the selected power voltage to the station repeater; Voltage conversion means for selectively connecting the power supply voltage applied from the outside to convert the power supply voltages into driving voltages of the signal identification and compensation means, the pulse comparison means and the fault detection means; And In the event of an error, the pulse signal transmitted from the second signal transmission means is transferred to the exchanger, and the pulse signal transmitted from the exchanger is transferred to the third signal transmission means, for looping to the power station by the relay contact, and from the controller. Remote loop circuit for transmitting the transmitted control signal to multiple repeaters Pulse code modulation repeater made further comprising. The method according to claim 1 or 2, The signal identification and compensation means, Automatic relay means for transmitting a pulse signal transmitted from said first signal transmitting means; A crystal oscillator having both ends connected to the automatic repeater; An inductor connected between a driving voltage for applying a predetermined voltage and the automatic relay means to block noise transmitted from the automatic relay means; And First and second capacitors connected in parallel between one end of the inductor and a ground to block noise transmitted from the automatic repeater; Pulse code modulation repeater consisting of. The method according to claim 1 or 2, The pulse comparison means, First and second differential amplifying means for amplifying the pulse signal transmitted from the automatic relay means in comparison with a reference signal; Comparison means for comparing pulse signals transmitted from the first and second differential amplifying means according to a clock output from the automatic relay means; Means for transferring said clock to said comparing means; Means for transferring the pulse signal output from the first differential amplifying means to the comparing means; And Means for transferring the pulse signal output from the second differential amplifying means to the comparing means Pulse code modulation repeater consisting of. The method according to claim 1 or 2, The fault detection means, First and second latching means for monitoring and latching a clock and an error according to the pulse signal transmitted from the comparing means, respectively; Counting means for counting an error detection period in accordance with a pulse signal transmitted from said comparing means; Logical product calculating means for performing an AND operation on the pulse signal output from the second latching means and the pulse signal output from the counting means; Third latch means for outputting and latching an error generated through the AND operation means; And Optical coupling means for optically driving the alarm relay according to the pulse signal transmitted through the first latch means and the third latch means Pulse code modulation repeater consisting of. The method of claim 5, The first latching means latches the pulse signal transmitted from the comparing means according to the first time constant determined by the connected first resistor and the first capacitor, And said second latching means latches a pulse signal transmitted from said comparing means in accordance with a second time constant determined by a connected second resistor and a second capacitor.