KR0153678B1 - Matching apparatus - Google Patents

Abstract

The present invention relates to a relay line connecting device having a loopback function, comprising: a loop control signal generator 34 generating a loop control signal according to control of a system; A connection receiving relay unit 31 which receives a bipolar line signal from a relay line side and connects the line signal according to a loop control signal; A reception matching transformer section 32 for converting a bipolar signal input from the reception relay section 31 into a unipolar signal; A reception matching circuit (33) for impedance matching the output of the reception matching transformer section (32) to the system side; A transmission matching circuit section 35 which receives a unipolar signal from the system side and performs impedance matching; A transmission matching transformer section 36 for converting the unipolar output signal of the transmission matching circuit section 35 into a bipolar signal; And a connection transmission relay section 37 which connects the bipolar output of the transmission matching transformer section 36 to a line side or a reception side according to a loop control signal to form a path environment path, and remote and internal loopback by a loopback control signal. Since it is possible, the test path can be provided at the connection part with the trunk line as needed, and the maintenance is easy.

Description

Relay line connection device with loopback function

1 is a block diagram showing a general relay line connection system.

2 is a block diagram showing the conventional trunk line connecting apparatus shown in FIG.

3 is a block diagram showing a relay line connecting device according to the present invention.

4 is an embodiment of a trunk line connecting apparatus according to the present invention.

* Explanation of symbols for main parts of the drawings

11: PSTN connection part 12: PSTN connection receiving part

13: PSTN connection transmitter 14: Clock recovery and matching data synchronization unit

15: framing / deframing section 16: deframing section

17 Framing unit 21 Transmit / receive relay connection unit

22: transmission / reception matching circuit 23: transmission / reception matching circuit

31: PSTN connection relay receiver 32: reception matching transformer

33: reception matching circuit section 34: loop control signal generating section

35: transmission matching circuit section 36: transmission matching transformer section

37: PSTN connection relay transmitter

The present invention relates to a relay line connecting device for interfacing a relay line side for transmitting bipolar data and a system side for processing unipolar data in a communication device such as a satellite communication terrestrial system (DAMA-SCPC). It relates to a trunk line connecting device.

Satellite communication terrestrial system is a communication device for providing voice telephony and low-speed data services using satellites. A central station and a plurality of relay stations are distributed to communicate with each other. In such a satellite communication terrestrial system, in order to connect information received from a satellite to a public telephone network (PSTN), a relay line is required between the satellite communication ground system and the public telephone network (PSTN) side, and the relay line is longer than a normal line. Since the loss is large, data is transmitted in a bipolar manner on the relay line in order to reduce errors in information transmission.

As described in FIG. 1, the connection system for interfacing the PSTN and the satellite communication terrestrial system by the relay line includes a PSTN connection receiver 12 which receives bipolar data from the relay line side and converts it into unipolar, and the PSTN connection. A clock recovery and matching data synchronizer 14 which receives the output of the receiver 12 to recover the clock and synchronizes data; A deframing unit (16) for deframing the data received from the clock recovery and matching data synchronization unit (14) and outputting it to the system side; A framing unit 17 for framing data input from the system side; A PSTN connection transmitter 13 converts the framed unipolar data into bipolar and outputs it to the relay line.

In this connection system, the conventional PSTN connection transmission / reception unit 11 includes a transmission / reception relay connection unit 21, a transmission / reception matching transformer unit 22, and a transmission / reception matching circuit 23 as shown in FIG. Consists of

The conventional PSTN connection transmission / reception unit 11 receives and decodes bipolar (HDB3) trunk data from the trunk line, converts the bipolar (HDB3) trunk data into unipolar data, and transmits the data to the deframing unit inside the system, and the data received from the system is encoded by HDB3. After the operation, the bipolar data is transmitted to the trunk line.

However, such a conventional connection device lacks a loopback function, and therefore, when constructing a test path or an order wire (O / W) loop, it was necessary to have a separate circuit or to construct a test path using another part of the circuit that can be looped back. There is a problem that is difficult to maintain.

Accordingly, an object of the present invention is to provide a relay line connecting device capable of selectively configuring a test path at a system side connection end that is directly interfaced with the relay line.

The apparatus of the present invention for achieving the above object is a relay line connecting device that receives a bipolar signal from a public telephone network (PSTN) by a relay line and converts it into a unipolar to connect to a satellite communication terrestrial system, the control of the system A loop control signal generator for generating a loop control signal; A connection receiving relay unit receiving a bipolar line signal from a relay line and connecting the line signal according to a loop control signal; A reception matching transformer for converting a bipolar signal input from the reception relay unit into a unipolar signal; A reception matching circuit for impedance matching the output of the reception matching transformer to a system side; A transmission matching circuit unit which receives a unipolar signal from a system side and performs impedance matching; A transmission matching transformer unit converting the unipolar output signal of the transmission matching circuit unit into a bipolar signal; And a connection transmission relay unit configured to form a connection lower path environment path to the line side or the reception side according to the loop control signal of the bipolar output of the transmission matching transformer unit.

That is, the present invention is to provide a loopback function by controlling the relay in accordance with the loop control signal after installing a relay in the connection with the relay line transmitted as a bipolar signal, for example, when the loopback signal becomes high, the relay line side The bipolar received signal inputted from is inputted to the bipolar transmitter and outputted to the relay line side. The unipolar signal inputted from the system side is fed back from the transmit relay unit to the receiving relay unit through the matching transformer and then outputted to the system side through the receiving matching transformer. .

Therefore, during normal operation (if not loopback), the signal input from the relay line is transmitted to the system side, and the signal input from the system side is transmitted to the relay line side. When the loopback signal is input, the signal input from the relay line side is fed back to the relay line side. (This is called user / remote loopback), and the signal input from the system side is fed back to the system side (this is called inner loopback).

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

The trunk line connection system to which the present invention is applied receives the output of the PSTN connection receiving unit 12 and the output of the PSTN connection receiving unit 12 which converts the bipolar data from the relay line side into unipolar as shown in FIG. A clock recovery and matching data synchronizer 14 for recovering a clock and synchronizing data; A deframing unit (16) for deframing the data received from the clock recovery and matching data synchronization unit (14) and outputting it to the system side; A framing unit 17 for framing data input from the system side; A PSTN connection transmitter 13 converts the framed unipolar data into bipolar rolls and outputs them to the relay line.

And, the relay line connecting apparatus according to the present invention, as shown in Figure 3, the loop control signal generation unit 34 for generating a loop control signal in accordance with the control system; A connection receiving relay unit 31 which receives a bipolar line signal from a relay line side and connects the line signal according to a loop control signal; A reception matching transformer section 32 for converting a bipolar signal input from the reception relay section 31 into a unipolar signal; A reception matching circuit (33) for impedance matching the output of the reception matching transformer section (32) to the system side; A transmission matching circuit section 35 which receives a unipolar signal from the system side and performs impedance matching; A transmission matching transformer section 36 for converting the unipolar output signal of the transmission matching circuit section 35 into a bipolar signal; And a connection transmission relay section 37 which connects the bipolar output of the transmission matching transmission section 36 to the line side or the reception side according to the loop control signal to form a path environment path.

In addition, as shown in FIG. 4, in the circuit of the embodiment for implementing the connection relay unit and the matching transformer unit, the transmission relay unit 31 is implemented with two relays K1 and K3, and the transmission matching transformer unit 36 is implemented. ) Is implemented with one matching transformer T1, the receiving relay unit 37 is also implemented with two relays K2 and K4, and the receiving matching transformer unit 32 is also implemented with one transformer.

The first to fourth relays may be implemented as TQ2-5V relays, and the first and second matched transformers may be implemented as PE5764 to convert bipolar signals into 2 Split Phase Unipolar signals.

Next, the operation of the embodiment of the present invention configured as described above will be described by dividing into a case where no loopback is performed and a case where loopback is performed.

1. No loopback

In the normal case without loopback, the HDB3 bipolar line signal is received from the relay line, converted to unipolar and then output to the system side, and the unipolar signal received to the system side is converted to HDB3 bipolar signal and output to the relay line side.

In other words, when the loopback control signal USER / REM_LOOP goes low, the first and fourth relays K1 to 4K are output because the output terminals of the first and second inverters U1 and U2 become high. K4) is turned off so that the output of the fourth relay K4 is connected to the second relay K2. Therefore, the bipolar signal inputted through the terminals SET1-TIP-IN + and SET1-TIP-IN- from the relay line is applied to the matching transformer T2 through the fourth relay K4 and the second relay K2. The matching transformer T2 converts the applied bipolar signal into a unipolar signal and outputs it to the system through the terminals RTIP and RRING.

In addition, when the loopback control signal USER / REM_LOOP is low, the receiver receives high output terminals of the first and second inverters U1 and U2, so that the first to fourth relays K1 to K4 are high. ) Is turned off so that the output of the first relay K1 is connected to the third relay K3. Therefore, the unipolar signal received through the terminals (TXA, TXB) from the system side is converted into a bipolar signal in the matching transformer (T1), and then passed through the terminals (SET1-TIP) through the first relay (K1) and the third relay (K3). -OUT +, SET-TIP-OUT-) is sent to the relay line.

2. Loopback

If a loopback is required, a loopback command is generated from a system controller (not shown). Accordingly, when the loopback signal generator 34 outputs high, the relays K1 to K4 are operated so that the signal input from the relay line is returned to the relay line. It is fed back to the side (this is called user / remote loopback), and the signal input from the system side is fed back to the system side (this is called inner loopback).

That is, when the loopback signal input through the terminal USER / REM_LOOP becomes high, the outputs of the first and second inverters U1 and U2 become low, and accordingly, the first to fourth relays K1 to K4. Is turned on to form a loopback path. For example, the output of the fourth relay K4 is connected to the third relay K3 so that the bipolar signal input from the relay line is transmitted to the relay line as it is, and the output of the first relay K1 is sent to the second relay K2. The signal inputted from the system side is converted into a bipolar in the matching transformer T1 and then converted into a unipolar in the matching transformer T2 and output to the system side.

As described above, since the remote and internal loopbacks can be performed by the loopback control signal according to the present invention, a test path can be provided at the connection part with the relay line if necessary, so that the maintenance is easy.

Claims (3)

In a trunk line connecting device which receives a bipolar signal from a public telephone network (PSTN) by a relay line and converts it into a unipolar to connect to a satellite communication terrestrial system, a loop control signal generating unit for generating a loop control signal under control of the system ( 34); A connection receiving relay unit 31 which receives a bipolar line signal from a relay line side and connects the line signal according to a loop control signal; A reception matching transformer section 32 for converting a bipolar signal input from the reception relay section 31 into a unipolar signal; A reception matching circuit (33) for impedance matching the output of the reception matching transformer section (32) to the system side; A transmission matching circuit section 35 which receives a unipolar signal from the system side and performs impedance matching; A transmission matching transformer section 36 for converting the unipolar output signal of the transmission matching circuit section 35 into a bipolar signal; And a connection transmission relay section 37 for connecting the bipolar output of the transmission matching transformer section 36 to a line side or a reception side according to a loop control signal to form a path environment path. Connection device. The relay line connection device of claim 1, wherein the connection transmission relay unit and the connection reception relay unit are implemented by a plurality of TQ2-5V relays. 2. The relay line connection device of claim 1, wherein the transmission matching transformer and the reception matching transformer are implemented as matching transformers.