JPH02246439A - Control line monitoring system using scramble pattern - Google Patents

Abstract

PURPOSE:To attain the monitor of a control line with only a small-sized and simple hardware by applying scramble to a supervisory and controlling signal to send the result and restoring the signal at the receiver into an original signal. CONSTITUTION:A monitoring/controlling signal from a monitoring/controlling signal generator 1 is scrambled with an exclusive OR circuit (EX-OR) 22 by using a scramble pattern from a scramble signal generator 20, the scrambled signal (data) is modulated by a modulator 2 and distributed and sent to an active line 15 and a standby line 16 from a hybrid circuit 3. The signal enters a demodulator 12 via a switch 6 in the reception section and an EX-OR 23 uses a descramble pattern from a descramble signal generator 21 to restore it into the original signal, it is received by the reception section 14 to monitor the control line. Thus, control line monitor is attained with only a small-sized and simple hardware without the use of a monitoring pilot signal generator using a large sized component.

Description

[Detailed description of the invention] [Table of contents] Overview Industrial field of application Prior art (Figure 5) Means for solving the problem to be solved by the invention (Figure 1) Effect (Figure 1) Implementation Example (Figures 2 to 4) Effects of the invention [Summary] IIl? using a scramble pattern? Regarding the I#iI monitoring method, control line monitoring can be performed using only small and simple hardware, without using a conventional monitoring pilot signal generator that uses large parts such as a tone fork oscillator or a reed filter. @'a is a system for monitoring analog control lines that monitor and control wireless equipment by shallowly FM modulating the main line.
In the 'lA monitoring system, the transmitting side is provided with a monitoring/control signal generator, a scramble signal generator, and an exclusive OR circuit, and the receiving side is provided with a descrambling signal generator, an exclusive OR circuit, and so on. The transmitting side scrambles and transmits the supervisory control signal using a scrambling pattern, and the receiving side restores the received signal to the original signal using the descrambling pattern.

[Industrial application field]

The present invention relates to a control line monitoring method using a scramble pattern, and more specifically, the present invention is used when monitoring control lines for monitoring and controlling wireless equipment, and in particular, monitoring can be performed using small and simple hardware. This invention relates to a second method for monitoring giJn lines using a scrambling pattern as described above.

[Conventional technology]

Conventionally, signals for monitoring and controlling wireless equipment have been transmitted by inserting bits into the main line (digital) or shallow FM modulation of the main line (analog).

In the method of shallowly FM modulating the main signal as described above, the control line monitoring using an analog control line is performed using a Pyro7) signal in addition to the normal monitoring control signal. is common.

FIG. 5 is a block diagram of a conventional control line monitoring system using a pilot signal as described above.

On the transmitting side, a supervisory/control signal generator 1, a modulator 2, a hybrid circuit 3, a supervisory pilot signal generator 4, an analog adder 5, etc. are provided.

Also, on the receiving side, there is a switch 6 for switching between the working line and the protection line, bandpass filters 7 to 9, and a detector 1.
0. II, a logic determination section 13 that performs logic determination for switching the switch 6, a reception section 14, a demodulator 12, etc. are provided.

The signal sent from the transmitting side is divided into two by the hybrid circuit 3.
One of them is sent to the working line 15, and the other is sent to the protection line wA16.

Under normal conditions, the switch 6 connects the working line 15 to the receiving unit 1.
When a fault occurs in the working line, the protection line 16 and the receiving unit 14 are switched to be connected by a signal from the logic determining unit 13.

On the transmitting side, the monitor/control signal (SV/RC) from the monitor/control B signal generator 1 is shallowly FM modulated by the modulator 2 and sent out, and the monitor pilot signal (SV/RC) from the monitor pilot signal generator 4 is transmitted. For example, a combination signal of three sine wave signals) is sent out, and the signal is sent out from the hybrid circuit 3 to each line via the analog adder 5.

This signal is received on the receiving side and various monitoring, control, etc. are performed.

At that time, the signal sent from the monitor/lj1m signal generator 1 is to monitor and control the N line equipment etc. in the middle of the transmission path, and the monitor pilot signal from the K-signal generator 4 is , for monitoring the transmission path itself.

If you try to implement the above method using conventional technology,
The supervisory pilot signal must be placed in a lower frequency band than the supervisory/control 1 (SV/RC) signal.

In other words, the S V/RC signal is modulated by the modulation H2.
This is because it is common to perform K modulation or QAM modulation, and in that case the band used is wide (S V
/RC shows only the center frequency, and there is a variation of F+:f with respect to this center frequency F).

Therefore, the monitoring pilot signal (a combination of three sine wave signals) has to be placed in a lower frequency band than the SV/RC.

When the supervisory pilot signal is placed in a low frequency band, the outer diameters of components such as a pitch fork oscillator and a reed filter that constitute the supervisory pilot signal generator 4 become large.

[Problem to be solved by the invention]

The above-mentioned conventional devices had the following drawbacks.

That is, since the monitoring pilot signal must be placed at a low frequency position, it is necessary to use large components such as a pitchfork oscillator and a reed filter to generate the signal.

Therefore, there is a drawback that the control line monitoring system becomes large in size.

The present invention eliminates these conventional drawbacks and uses only small and simple hardware without using a monitoring pilot signal generator that uses large components such as a conventional tone fork oscillator or reed filter. The purpose is to enable control line monitoring.

[Means to solve the problem]

In order to achieve the above object, the present invention is as follows.

FIG. 1 is a principle diagram of a control line monitoring system using a scramble pattern according to the present invention.

This invention does not use the conventionally used monitoring pilot signal, but instead transmits the monitoring/control signal itself with soufflé, and returns the signal to the original monitoring/control signal on the receiving side.

The monitoring/control signal (data) (hereinafter referred to as "rSV/RC signal") from the monitoring/control signal generator 1 is processed through an exclusive OR circuit ( (hereinafter referred to as EX-OR)
Scrambled by 22.

This scrambled signal (data) is modulated by the modulator 2 and then distributed from the hybrid circuit 3 to the working line 15 and the protection line 16 and sent out.

In the receiving section, the signal enters the demodulator 12 via the switch 6 and is demodulated, and is further restored to the original signal by the EX-OR 23 using the descrambling pattern from the descrambling signal generator 21.

By receiving this at the receiving unit 14, the control line is monitored.

[Effect]

Since the configuration is as described above, the scramble signal generator 2
0 or the same control as the conventional method by simply using the descrambling signal generator 21? One-line monitoring is possible.

In this case, the scramble signal generator etc. may be, for example,
Since it can be realized using simple hardware such as a shift register, it does not require a large device unlike conventional ones.

〔Example〕

Embodiments of the present invention will be described below based on the drawings. Second
The figure is a block diagram of one embodiment of the present invention, and the same reference numerals as in FIG. 1 indicate the same parts.

On the transmitting side, a monitoring/control signal generator 1, a scramble signal generator (SCR) 20, a modulator 2, a hybrid circuit 3, and an EX-OR 22 are provided.

Further, on the receiving side, a switch 6 for switching between the working line 15 and the protection line 16, a demodulator 12, an EX-OR 23, a receiving section 14, a descrambling signal generator (DSCR) 21,
A synchronization determination unit 23 and the like are provided.

Then, the demodulator 12 extracts the scramble pattern sent from the transmitting side from the demodulated signal, and the synchronization determination unit 23 extracts the scramble pattern sent from the transmitting side.
Synchronization is determined at

The result of this synchronization determination is the switch 6 for switching the transmission path.
control switching. Also, depending on the timing after the synchronization determination, the descramble signal generator (DSCR) 2
1 and inputs the output of the demodulator 12 and the descrambling pattern from the descrambling signal generator 21 (same as the scrambling pattern on the transmitting side) to the EX-OR 23, extracting the original data and receiving it. Send to Department 14.

During the above operation, if the synchronization determination unit 23 determines that synchronization is not achieved, for example, if the preset generator polynomial is incorrect, or if there is a transmission failure, a control signal is sent to switch the switch 6. issue.

Furthermore, if synchronization is established, a timing signal is sent to the descrambling signal generator 21 to perform descrambling.

FIG. 3 is a diagram showing a specific example of the scramble signal generator in the above embodiment.

In this example, an 8-bit (Di to Do) configuration shift register SR and EX-OR are used, and an external clock CL is used.
The data is sequentially shifted by K, and a scramble signal (scramble pattern) is output from the output OUT.

The scrambled bang obtained at the output OUT is defined by a predetermined polynomial, such as G (X) = X'+X''+1, and its pattern has randomness. Have it ready.

Note that the descrambling signal generator also performs descrambling by using the same scramble pattern as described above.

FIG. 4 is an explanatory diagram of scrambling in the above embodiment.

Now, suppose that the SV/RC data is as shown in (a). A scramble pattern (S
The CR pattern) is defined by a predetermined generating polynomial G (x) as shown in (b) (see Figure 3), and the pattern has randomness (assuming there is no identical pattern within the data). .

Next, the data in (a) is scrambled by the pattern in (b) by the EX-OR 22, and the sending data (exclusive OR of the SV/RC data and the SCR pattern) with unknown contents as in (c) is generated. obtained, and this is used in a hybrid circuit (H
) 3 and send it out.

On the receiving side, the data is received and a demodulator (DEM) 1
2, the EX-OR 23 uses the descrambling pattern shown in (d) from the descrambling signal generator 21 (same as the scrambling pattern shown in -1-) to convert the original (S Extract.

This extracted data, like (e), is the same as the original data (b).

In the above operation, various scrambling patterns can be obtained by changing the generator polynomial, so by preparing a plurality of these, it is possible to prevent root interference peculiar to radio.

〔Effect of the invention〕

As explained above, the present invention has the following effects.

(1) The components for scrambling or descrambling the SV/RC signal need only be simple hybrids that perform logical processing.

Therefore, there is no need for large parts like in the past,
The system of the present invention has a compact and economical hybrid configuration.

(2) Differences in patterns due to abnormalities in the transmission line or interference from other routes can be detected, making it an excellent method for monitoring control lines.

[Brief explanation of drawings]

Fig. 1 is a principle diagram of a control line monitoring system using a scramble pattern according to the present invention, Fig. 2 is a block diagram of an embodiment of the present invention, and Fig. 3 is a specific example of a scramble signal generator in the above embodiment. FIG. 4 is an explanatory diagram of scrambling in the above embodiment, and FIG. 5 is a block diagram of a conventional example. 1-Control/monitoring signal generator 2--Modulator 3-Hybrid circuit 20--Scramble signal generator (SCR) 6-Switch 12-Demodulator 22.23--Exclusive OR (EX-OR) ) 21-Descrambling signal generator (DSCR) - receiving section

Claims (1)

[Claims] In a control line monitoring method for monitoring an analog control line for monitoring and controlling wireless equipment by performing shallow FM modulation on the main line, a monitoring system that outputs a monitoring control signal to the transmitting side. / A control signal generator (1), a scramble signal generator (20) that outputs a scramble pattern, and an exclusive OR circuit (22) are provided, and on the receiving side, a descramble signal generator that generates a descramble pattern is provided. The exclusive OR circuit (22) on the transmitting side scrambles the supervisory control signal using a scramble pattern and sends it out, and the exclusive OR circuit (22) on the transmitting side scrambles the supervisory control signal and sends it out. A control line monitoring method using a scrambling pattern characterized in that a received signal is restored to the original signal using a descrambling pattern by an exclusive OR circuit (23).