JPS59219043A - Electric value supervising system - Google Patents

Abstract

PURPOSE:To allow both carrier terminal stations to judge easily whether a fluctuation in a received electric value is caused by a transmission line or any of the carrier terminal station devices by allowing both carrier terminal stations to supervise a transmitted value and a received value in a communication system where the carrier terminal stations are connected oppositely. CONSTITUTION:When loss or fluctuation or the like of a transmission line 3 is, for example, supervised from a carrier terminal station 1' to a carrier terminal station 2', a digital signal converted digitally from a transmitted value such as a transmission of a pilot signal, a transmitted voltage value of power for transmission and a transmitted current value or the like is transmitted from the carrier terminal station 1' to the carrier terminal station 2', and also transmitted to a level supervising device 11 and a comparator 10. A carrier terminal station device 5 converts digitally a received value such as a receiving level of the pilot signal, a received voltage of supply power and a received current value or the like to a comparator 13 and a level supervising device 14 and transmits the received value to a carrier terminal station device 4. Thus in case of the fluctuation of received value, both the carrier terminal stations 1', 2' can discriminate easily whether the cause exists in the transmission line 3 or the carrier terminal station devices 4, 5.

Description

Detailed Description of the Invention (a) Technical Field of the Invention The present invention relates to a communication system in which opposing carrier terminal stations are connected by a transmission path, in which pilot signals are transmitted from one carrier terminal station to the other six stations on Kayo Island. When transmitting analog electricity for power supply through a coaxial transmission line, the transmitting and receiving values such as the transmitting level, receiving level, transmitting voltage value, receiving voltage value, transmitting current value, and receiving current value are transmitted at the side carrier terminal station. The present invention relates to an electricity value monitoring method that allows both carrier terminal devices to easily determine whether the cause is the carrier terminal station or the transmission line when the received electricity value fluctuates.

(b) Prior Art and Problems Below, a conventional example will be explained using a pilot signal as an example of analog electricity.

FIG. 1 is a block diagram of a conventional pilot signal level monitoring system.

In the figure, 1 and 2 are carrier terminal stations, 3 is a transmission line, 4 and 5 are carrier terminal equipment, 6 is a pilot signal generator, and 7.8 is a level monitoring device.

Figure 1 shows an example of transmitting a pilot signal from carrier terminal station 1 to carrier terminal station 2, and monitoring abnormalities due to changes in transmission line 3 from carrier terminal station 1 to carrier terminal station 2. . That is, the pilot signal generated by the pilot signal generator 6 is transmitted to the carrier terminal device 4. Send I to the carrier terminal device 5 via the entire transmission line 3
At the sending end station 1, the level monitoring device 7 monitors the transmission level of the pilot signal generator 6, and at the carrier end station 2, the level monitoring device i+<58 monitors the pilot signal reception level of the carrier station device 5. There is. However, this method has the disadvantage that when there is a fluctuation in the reception level, it is difficult for the carrier terminal station 2 to determine whether the cause is the carrier terminal station 1 or the transmission line 3. The carrier terminal station L does not even know the reception level and the transmission line 3
Of course, +4J has a large drawback.

(c) Object of the Invention In view of the above-mentioned drawbacks, the object of the present invention is to provide an "easy connection" system for transmitting analog electricity from one carrier terminal station to the other carrier terminal station.
An object of the present invention is to provide an electric value monitoring system that facilitates determining whether the cause of fluctuations in atmospheric pressure is the carrier terminal station or the transmission line at a carrier terminal station.

(,i) Structure of the Invention In order to achieve the above object, the present invention transmits a pilot signal from a first carrier terminal station to a second carrier terminal station.

When transmitting analog electricity such as feeding power, the transmission level of the pilot signal from the first carrier terminal station.

The power transmission values such as the power transmission voltage value and the power transmission current value of the 1b5 power for supply are digitally converted to the second transport terminal station, and the power is transmitted to the second transport terminal station.
The carrier end station converts the received power values such as pilot signal reception level, power supply voltage value, and power reception current value into digital values and transmits them, and the transmitting end station monitors the transmitted and received values to receive the power. It is characterized by making it easy to distinguish the cause of fluctuations in electrical values before the transmission end station is installed.

(e) Embodiment of the Invention Below, as an embodiment of the present invention, a case of a pilot signal as analog electricity will be explained.

FIG. 2 is a block diagram of a pilot signal level monitoring system according to an embodiment of the present invention.

Components in the figure that have the same functions as those in FIG. 1 are indicated by the same symbols.

1', 2' are carrier terminal stations, 9, 1.2 are analog-to-digital converters (hereinafter referred to as A/D converters), 10+13
11 and 14 are comparators, 11 and 14 are level monitoring devices, 15 and 16 are meeting lines, and 14 is a transmission line in the transmission line 3 excluding the meeting lines 15 and 16.

Figure 2 shows an example of a case where a pilot signal is transmitted from carrier terminal station 1' to carrier terminal station 2', and abnormalities due to loss fluctuations in the transmission line 3 from carrier terminal station l' in the direction of carrier terminal station 2' are monitored. It is.

Pilot signal sending level Ls q at the connection point of the carrier terminal device 4 with the transmission line 14 A digital signal converted into a digital signal by the A/D converter 9 is transmitted to the carrier terminal device 5 using the meeting line 15 It is also sent to the level monitoring device 11 and comparator 10. The carrier terminal station 5 sends the sent digital signal of the pilot signal sending level Ls to the comparator 13 and the level monitoring device 14. On the other hand, the reception level of the received pilot signal is converted into a digital signal by the Lak A/D converter 12i/C, and the digital signal is sent to the carrier terminal equipment 4 via the meeting line 16 and also sent to the comparator 13. The comparator 13 detects the difference between the pilot signal sending level Ls and the receiving level LR, and monitors the level of the digital signal 14.
send to The level monitoring device 14 detects the difference between the pilot signal sending level Ls, the pilot signal sending level L8, and the receiving levels I and R. Since the variation range of this difference corresponds to the change in the transmission characteristics of the transmission line 3, abnormalities in the transmission line and the line 3 can be determined from this variation. (Even if the transmission characteristics of the transmission line 3 are improved and the characteristics of the contact line 14 are changed, the digital value of the pilot signal sending level Ls does not change.) Also, this difference is constant.
If the pilot signal sending level Ls decreases, the carrier terminal station l
An abnormality can be seen on the ' side. On the other hand, the received level LR of the pilot signal sent to the carrier terminal equipment 4 is sent to the comparator 10, and the comparator 10 generates a digital signal representing the difference between the pilot signal sending level Ls and the received level LR. Similarly to the level monitoring device 14, the 0 level monitoring device 11 that sends the fiffil IK detects a change in the transmission characteristics of the transmission 'kf3' or an abnormality on the carrier terminal station 1' side. Additionally, the carrier terminal device 5
If there is an abnormality, it can be determined by another monitoring function on the carrier terminal station 2' side as it is within the own station, as in the past, so it is easy to determine whether the cause of reception level fluctuation is transmission line 3 or carrier terminal station 1'. I can judge. On the carrier terminal station 1' side, it is not known whether the fluctuation in the pilot signal reception level LR on the carrier terminal station 2' side is caused by the direct transmission path 3 or the carrier terminal equipment 5, but at least the reception level LR, which was unknown in the past, is unknown. It is possible to determine whether the fluctuation in the carrier terminal station 1' 1jll is caused by the transmission path 3 and the carrier terminal equipment 5, and the causes can be easily distinguished. The above method has been described for the pilot signal, but when transmitting power, (,; Pressure value receiver - 1L voltage value), when monitoring the transmitting 7L current value and receiving current value, the receiving electric power is also used. When the value fluctuates, it is easy to determine whether the cause is the carrier terminal station or the transmission line at the carrier terminal station using the same method -Ci'+lQ.

(f) Effects of the Invention As explained in detail above, according to the present invention, when analog electricity is sent from one potato sending terminal station to the other carrier terminal station, the cause of the fluctuation in the received electricity value can be detected at the rainy day carrying terminal station. This has the effect of making it easier to determine whether it is a carrier terminal station or a transmission line.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional Byront signal level monitoring system, and FIG. 2 is a block diagram of a pilot signal level monitoring system according to an embodiment of the present invention.

Claims (1)

[Claims] In a communication system in which opposing carrier terminal stations are connected by a transmission path, when analog electricity is sent from a first carrier terminal station to a second carrier terminal station, the transmitted power value is converted into a digital value from the first carrier terminal station. and transmits it to the second carrier terminal station via the transmission line, and the second carrier terminal station converts the received power value into digital and transmits it to the first carrier terminal station via the transmission line. Electrical value monitoring method with all features.