KR20040020254A - A matching circuit of ds3 signal - Google Patents

Abstract

PURPOSE: A circuit for matching DS3 signal is provided, which is easily available with a very low cost as well as has an industrial utilization effect for using a universal relay with a very small volume. CONSTITUTION: A circuit for matching DS3 signal includes a universal relay(100), an impedance block(110), an input matching block(25), an output matching block(35) and a transformer(45). The universal relay(100) receives and transmits the DS3 communication signal by a selection signal and it processes the DS3 signal by outputting the DS3 signal applied thereto by another path. The impedance block(110) receives the DS3 signal applied from the universal relay(100) and matches the DS3 signal to output the matched DS3 signal. The input matching block(25) converts the DS3 signal applied from the impedance block(110) into an AU3 signal by adding an overhead information and outputs the converted AU3 signal. The output matching block(35) converts the inputted AU3 signal into a DS3 signal to output the DS3 signal. And, the transformer(45) adjusts the voltage level and the impedance by inputting the DS3 signal applied from the output matching block(35) and outputs the adjusted voltage level and impedance to the universal relay(100).

Description

DS 3 signal matching circuit {A MATCHING CIRCUIT OF DS3 SIGNAL}

The present invention relates to a DS3-class signal matching circuit, and more particularly, to a circuit for matching and transmitting DS3-class signals using only one general purpose relay without using an impedance relay.

Due to the increase in the demand for communication, equipment for transmitting communication signals at high speed has been developed, and high-speed signals are classified into DS1, DS1E, DS3, STM1, etc. for the standardization of the high speed transmission equipment.

The high-speed signal divided into the above classes and transmitted at high speed is assigned an inherent impedance (IMPEDANCE) for smooth transmission of each signal. In particular, the impedance must be matched with respect to the receiving side to signal error. Can be received without.

The transmission rate of the DS3 class is 44.736 Mbps, the impedance is 75 ohms (Ω), it is common to match the impedance (MATCHING) in the receiving side receiving through the transmission line.

By receiving the DS3 level signal as described above and adding overhead information, it is converted into an AU3 level signal of 51.840 Mbps, and the three AU3 levels are gathered together to become an STM1 level signal of 155.52 Mbps, and the STM1 level signal is optical The signal is transmitted by the optical transmitter via the optical cable and processed in the reverse direction by the optical receiver.

The equipment having the above function is generally called a transmission device, and in order to reduce the size and cost of the transmission device, it is necessary to develop a matching circuit necessary for input / output of a DS3-class signal at a small size and low cost.

Hereinafter, a DS3 signal matching circuit according to the prior art will be described with reference to the accompanying drawings.

Attached to explain the prior art, FIG. 1 is a functional configuration diagram of a class 3 input / output matching circuit according to the prior art, and FIG. 2 is a characteristic diagram of an impedance relay.

Referring to FIG. 1, the DS3 signal matching circuit according to the prior art is applied from a signal terminal processing a communication signal by operating a relay according to a corresponding selection signal, thereby providing a DS3 class of 44.736 Mbps. An input impedance relay unit 10 for inputting a signal in a state where the signal is matched with an impedance of 75 ohms (Ω),

An input matching unit 20 for converting a DS3-class signal applied from the input impedance relay unit 10 into an AU3-class signal of 51.840 Mbps by adding an overhead signal to the transmitter, ,

An output matching unit 30 which inputs an AU3-class signal of 51.840 Mbps applied from the transmitting end, converts the AU3-class signal into a 44.736-Mbps DS3-class signal, and outputs it;

A transformer 40 that receives the DS3-class signal applied from the output matching unit 30 and adjusts the voltage level and outputs the impedance by adjusting the impedance;

The output impedance relay unit 50 receives the DS3-class signal applied from the transformer 40 and matches the signal with an impedance of 70 ohms by outputting the signal to the signal terminal. It is composed of

In the above configuration, the input impedance relay unit 10 and the input matching unit 20 are referred to as an input unit 60, and the output matching unit 30, the transformer 40, and the output impedance relay unit 50 are output units 70. It is called.

Hereinafter, a DS3 signal matching circuit according to the related art having the above configuration will be described in detail with reference to FIGS. 1 and 2.

The signal stage converts a plurality of communication signals into a DS3 class signal of 44.736 Mbps by the corresponding process and applies them to the input impedance relay unit 10 constituting the input unit 60.

The input impedance relay unit 10 operates a relay according to the corresponding selection signal, and the relay inputs a DS3 level signal in a matching state because the input impedance is 70 Ω.

The input impedance relay unit 10 applies a matched and input DS3-class signal to the input matching unit 20, and the input matching unit 20 converts the DA3-class signal into an AU3-class signal and outputs it to the transmission stage. ,

The transmitter, for example, converts three AU3-class signals into STM1-class signals of 155.52 Mbps and transmits and receives them via an optical cable as optical signals.

The AU3-class signal received and applied from the transmission stage as described above is input by the output matching unit 30 of the output unit 70, converted into a DS3-class signal, output to the transformer 40, and the transformer ( 40) adjusts and outputs the voltage level and impedance of the input DS3 level signal to the set level.

The signal output from the transformer 40 is applied to the output impedance relay unit 50, and the output impedance relay unit 50 is matched to an impedance of 70 ohms and output to the signal terminal. .

Referring to FIG. 2, the impedance relays 10 and 50 match the impedance of the input / output DS3-class signal to 70 ohms and provide separation between frequency and return loss. And insertion loss is good, but it is relatively bulky, expensive, and not generally used, so procurement by supply and demand is not smooth.

When receiving the DS3-class signal transmitted from the signal stage, the impedance must be matched to receive without error, but when transmitting the DS3-class signal to the signal stage has a characteristic that does not have to accurately match the impedance.

Therefore, the DS3-class signal matching circuit having the above-described configuration has 70 ohms (Ω) at the input unit 60 and the output unit 70 to transmit the DS3-class signal transmitted and received with the signal terminal in a matching state. Since impedance relays 10 and 50 are used to input and output while matching impedances, circuits are complicated and bulky.

In addition, the impedance relay unit 10, 50 is to match the impedance (impedance) of 70 ohms (Ω), because it is not universal, expensive and difficult to procure to secure demand There is.

It is an object of the present invention to provide a matching circuit in which the size of the matching circuit for transmitting / receiving DS3-class signals is reduced and the price is lowered, and the procurement of the corresponding parts is easy.

In order to solve the above problems, the present invention includes a general-purpose relay for receiving and transmitting a communication signal of the DS class 3 by the selection signal, and outputs and processes the DS class signal applied to another path; An impedance unit configured to receive a DS-class signal applied from the general-purpose relay, match an impedance, and output the impedance; An input matching unit which adds overhead information to the DS class signal applied from the impedance unit and converts the signal into a Class III signal; An output matching unit converting the input A3 level signal into a DS level signal and outputting the converted signal; It is characterized by consisting of a transformer for inputting the DS-class signal applied from the output matching unit to adjust the voltage level and impedance and output to the general-purpose relay.

1 is a functional configuration diagram of a DS3 input / output matching circuit according to the prior art;

2 is a characteristic diagram of an impedance relay,

3 is a functional diagram of a DS3 signal matching circuit using the relay of the present invention;

4 is a detailed functional block diagram of the impedance unit according to the present invention.

** Explanation of symbols on the main parts of the drawing **

10: input impedance relay unit 20, 25: input matching unit

30,35: output matching section 40,45: transformer

50: output impedance relay unit 60: input unit

70: output unit 100: general purpose relay

110: impedance unit 112: impedance resistance

114: transformer 116: pull-down resistor

Hereinafter, according to the present invention, a DS3 signal matching circuit using a relay will be described with reference to the accompanying drawings.

In order to explain the present invention, FIG. 3 is a functional configuration diagram of a DS3 signal matching circuit using the relay of the present invention, and FIG. 4 is a detailed functional configuration diagram of an impedance unit according to the present invention.

3 and 4, according to the present invention, a 44.736 Mbps DS class 3 MATCHING circuit using a relay corresponds to a communication signal generated by a large number. The general purpose relay which converts and outputs DS3 level signal and inputs DS3 level signal applied from the signal terminal performing the processing in the opposite direction through the processing, and inputs the applied DS3 level signal according to the selected signal ( 100),

Impedance resistance 112 for matching the impedance of the DS3-class signal by receiving the DS3-class signal input from the signal terminal through the general-purpose relay 100 in an impedance matching state. ; A transformer (114) for adjusting the voltage level of the signal whose impedance is matched by the impedance resistor (112) and again adjusting the impedance; Impedance unit 110 for receiving and outputting the DS3 signal in a matched state by being made of a pull-down resistor 116 to adjust the voltage level of the signal output from the transformer 114 and output it,

Input the DS3 class signal of 44.736 Mbps applied in the matching state from the impedance unit 110, add the information on the transmission path, etc. as overhead (OVERHEAD) information to convert to the AU3 class signal of 51.840 Mbps for transmission An input matching section 25 output to the stage,

An output matching unit 35 for converting the 51.840 Mbps AU3-class signal applied from the transmission stage into a 44-736 Mbps DS3-class signal by separating the overhead by the corresponding processing;

It is composed of a transformer 45 for inputting a signal applied from the output matching section 35 to adjust the voltage level and impedance to be applied to the general-purpose relay 100 through a dedicated path.

Hereinafter, according to the present invention having the above-described configuration, it will be described in detail with reference to Figures 3 and 4 attached to the DS3 signal matching circuit using a relay.

As the demand for communication increases with the modern society, high speed transmission equipment and high speed exchangers have been developed to deal with a large number of communication signals with a few exchanges and transmission paths.

The high-speed communication signals as described above are regularly classified or classified based on the transmission speed. For example, when transmitting a 1.544 Mbps signal is called a DS1 transmission line, and when transmitting a 44.736 Mbps signal, a DS3 transmission line. In case of transmitting 51.840 Mbps signal, it is called AU (AU) level 3, and it is called STM1 level that transmits 155.52 Mbps signal of three AU3 levels. The signals are transmitted and received using a coaxial cable or an optical cable.

Each of the high-speed signals according to the above-mentioned stepwise classification is converted into a high-speed signal of a high transmission rate by adding a plurality, or converted into a high-speed signal of a low transmission rate by transmitting a number, and the corresponding signal is matched in the above case. Circuit is needed.

The present invention relates to a matching circuit for matching and inputting a DS3-class high-speed signal to a AU3-class high-speed signal and outputting the reverse signal. Transmitting and receiving a signal is called a transmitting end.

The DS-3 class signal of 44.736 Mbps applied from the signal stage is input to the corresponding dedicated path, and the DS3 level signal is output to the signal stage through another corresponding dedicated path, thereby providing the selected signal. The general purpose relay 100 performs a function of operating the general purpose relay so that the DS3-class signal is inputted and outputted.

In order to receive the DS3-class signal applied from the signal stage without error, the impedance must be matched, and the DS3-class applied from the general-purpose relay 100 by the impedance resistor 112 of the impedance unit 110. The impedance of the signal is matched, and the signal is output after the impedance is matched and the voltage level is adjusted by the transformer 114 and the impedance is again adjusted and output. The DS3-class signal output as described above is the pull-down resistor 116. ) The voltage level is adjusted once again and output.

As described above, when the impedance and the voltage level are adjusted to the matching state by the impedance unit 110 and output, the input is input to the input matching unit 25, and the corresponding overhead is added to the AU3-class high speed signal of 51.840 Mbps. It is converted into and output to the transmitting end.

The transmission stage collects three AU3-class signals, converts them into STM1-class signals of 155.52 Mbps transmission speed including the corresponding overhead, and simultaneously transmits the signals received through the optical cable to AU3-class signals to convert the output matching unit. Is applied to (35).

The output matching unit 35 receiving the AU3-class signal from the transmitting end converts the overhead into a DS3-class signal and applies it to the transformer 45 while separating and processing the overhead.

The transformer 45 adjusts the voltage level and impedance of the DS3-class signal inputted from the output matching unit 35 and applies it to the general purpose relay 100 through a corresponding dedicated path, and the general purpose relay 100 It transmits DS3 level signal to signal stage through dedicated path.

The general purpose relay 100 includes a dedicated path for transmitting a signal applied from a signal terminal to the impedance unit 110 and a dedicated path for transmitting a signal applied from the transformer 45 to the signal terminal, respectively. The general-purpose relay operates by the control applied through the selection signal to transmit the signals of each path.

The general-purpose relay 100 simply connects a path so that a corresponding signal is transmitted, does not adjust impedance and voltage level, and must match impedance in order to process a signal received from a signal terminal. As described above, the impedance matching is processed by the impedance unit 110, and general communication equipment inputs a matching (MATCHING) signal at the receiving side.

In more detail, the DS3 level signal is input in a matched state by the impedance resistor 112 constituting the impedance unit 110, the voltage is adjusted by the transformer 114, and the impedance is adjusted again, and the pull-down resistor is used. By 116, the voltage level is adjusted again and output.

Therefore, the present invention having the above-described configuration uses one general-purpose relay having two paths, and therefore, there is an advantage of not having to use two conventional and bulky impedance relays.

In addition, there is an advantage of receiving the DS3-class signal input by adding the impedance unit 110 in a matched state.

The present invention having the above-described configuration has an industrial use effect of using a general-purpose relay having a low cost, easy procurement, and a small volume in inputting a DS3-class signal in an impedance matching state.

In addition, since only one general-purpose relay is used, there is a miniaturization effect of reducing the size of the matching circuit, and at the same time, since the circuit configuration is simple, there is an industrial use effect of improving reliability by reducing a failure site.

Claims (3)

A general purpose relay for receiving and transmitting a communication signal of a class 3 class by a selection signal and outputting a class 3 signal applied to another path; An impedance unit for receiving a third-class signal applied from the general-purpose relay, impedance matching, and outputting the impedance; An input matching unit which adds overhead information to the DS class signal applied from the impedance unit and converts the signal into a Class III signal; An output matching unit for converting the input A3 level signal into a DS level signal and outputting the same; And a transformer for inputting a third-class signal applied from the output matching unit to adjust a voltage level and an impedance, and output the same to the general-purpose relay. The method of claim 1, wherein the general-purpose relay, And an input signal and an output signal are transmitted through the respective paths, and are transmitted through the respective paths and operated by the corresponding selection signal. The method of claim 1, wherein the impedance unit, An impedance resistance input by matching the impedance of the applied signal; A transformer for adjusting and outputting a voltage level and an impedance of a signal input in a state where impedance is matched by the impedance resistance; And a drop-down resistor for adjusting a signal level of the signal output from the transformer.