JPH03143050A - Loop communication system - Google Patents

Abstract

PURPOSE:To improve the reliability of information transmission by notifying deterioration in quality of a transmission line to a system control means when number of undefined codes generated per unit time exceeds a prescribed level. CONSTITUTION:A system control means 7 applies connection or changeover command of transmission lines 10, 11 based on the detection of an undefined code on the transmission lines 10, 11 and the notice of quality deterioration in the transmission line. After a quality monitor means 8 obtains number of undefined codes generated per unit time from the undefined code detected by the system control means 7, the undefined code per unit time and a referenced quality monitor comparison data are compared and when the undefined code per unit time exceeds a prescribed level, the deterioration in the quality of the transmission lines 10, 11 is informed to the system control means 7. Thus, the deterioration in the transmission line is early detected and the reliability of information transmission is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object 1 of the Invention] (Production of rigidity! Pf) The present invention relates to a loop communication system that connects a dual transmission path consisting of a current III system and a standby system. .

(Conventional handling method) Informatization? 1'+ for the extension of one meeting, multiple transmissions 1.4 including the control station, the working system (- secondary system) and the waiting system (secondary system)
11 in the opposite direction. A loop-type communication system has been developed that connects to J-1 via a double I-signal transmission path that transmits one I-signal and performs more advanced communications.

Such a loop expression i! In order to improve the reliability and reliability of information transmission, the A system is designed to improve the reliability of information transmission.When a line failure occurs due to the line S, stations adjacent to the transmission line where the line failure has occurred are placed in a loop. The system enters the back state, thereby forming a return loop between the active system and the standby system, and communication is resumed.

Also, to improve the performance of loop communication systems.
By using two sets of transmitting and receiving units in each station and using both the active and standby systems equally, the apparent performance can be doubled.

Thus, although loop communication systems have improved reliability and performance and provide more advanced communication,
Transmission lines deteriorate after long-term use. As described above, when the transfer path deteriorates, the effective transfer rate decreases due to the deterioration, resulting in a decrease in reliability.

Furthermore, after a line fault occurs until communication is restarted, communication is interrupted due to system switching at each station and loopback processing at a station adjacent to the transmission line where the line fault has occurred.

(Problem to be solved by the invention) As described above, in the conventional loop communication system described above, when the transmission path deteriorates, the effective transfer rate decreases with the deterioration, and the 11; Spying on unreliable codes.

Furthermore, communication is interrupted from the time a line failure occurs until communication is fully established, which similarly causes a decline in the reliability of information transmission.

The purpose of the present invention is to provide a loop martial arts system that has been developed in response to these circumstances and can improve the reliability of information transmission.

[++XS construction of the invention] (Means for solving the problem) In order to achieve the above object, the loop communication system of the present invention transmits multiple stations including at least one control station by double transmission. When a failure occurs on the transmission path, stations adjacent to the failure point on the transmission path enter a loopback state and reconfigure the transmission path based on a loopback instruction from the control station. In a loop communication system, each station has a system control means that instructs connection or switching of the transmission path based on the detection of an undefined code on the transmission path and notification of quality deterioration of the transmission path, and a After calculating the number of undefined codes generated per qtα■r from the defined codes, we calculate the number of undefined codes generated per qtα■r.
The undefined code per 'j interval is compared with the standard quality monitoring comparison data, and if the undefined code per il1 exceeds a predetermined level, the quality deterioration of the transmission path is sent to the system J1 control means. A quality monitoring means for notifying the user, and a comparison result holding means for holding the comparison result by the quality monitoring means, which has comparison data for quality monitoring as a reference and a timer for giving a unit time. .

(Sakukawa) In the loop communication system of the present invention, the system control means instructs the connection or switching of the transmission path based on the detection of an undefined code on the transmission path and the notification of quality deterioration of the transmission path, and the quality monitoring means After determining the number of undefined codes generated per time rl from the undefined codes detected by the control means, this! 1 (place 11!1) Compares the human table code of 1 interval with the comparison data for quality monitoring that serves as the basis, and if the undefined code of the middle rank exceeds a predetermined level, it is sent to the system control means. Notify of quality deterioration of the transfer path.

(Embodiment) Details of embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a loop communication system according to the present invention.

As shown in the figure, the transmission station of Loop Budo (Niji System) consists of a receiving section (R1) 1, a LAN interface 2,
Transmitter (1''l) 3, receiver (+?2) 4, LAN interface 5, transmitter (1'2) 6, system control unit 7, quality monitoring unit 8, node processor (NP) interface 9. In response, fM has been established.

The receivers 1 and 4 convert serious or optical signals transmitted through the transmission path (active system) 10 and the transfer path (standby system) 11 into a logic format that can be recognized within the transmission station.

LAN interfaces 2 and 5 are connected to system 1. The transmission line system is physically connected or switched according to instructions from the control unit 7.

The transmitters 3 and 6 convert information from inside the transmission station into electrical or optical signals, and send the converted signals to the transmission line 10.
Or output to 11.

A system control unit 7, which is a system control means, maintains information on the transmission line system currently in use, detects undefined codes on the transmission line 10 or 11, and detects undefined codes on the transmission line 10 or 11 from the quality monitoring unit 8.
Alternatively, based on the notification of quality deterioration in step 11, an instruction is given to connect or switch the system to LAN interface 2 or 5.

The quality monitoring unit 8, which is a quality monitoring means, detects the undefined codes generated every 71'-(n hours) from the undefined codes detected by the system control unit 7 every Llt time from the NP gain face 9. After calculating the number, compare the undefined code for the 11th hour opening time with the standard quality monitoring comparison data from NP gain phase 9, and find that the undefined code for the 71''L hour is at the predetermined level. If the value exceeds the threshold, the system control unit 7 is notified of the quality deterioration of the transmission path 10 or 11.

The NP gain face 9, which is a means for holding a comparison frame, receives instructions from a node processor (NP) (not shown) and performs a predetermined operation. After setting the timer to H, the comparison result by the quality monitoring section 8 is maintained.

Next, the operation of the X1-configured loop communication system will be explained using a second country.

The loop communication system shown in the country connects a transmission station (STN) 12. via transmission lines 10 and 1. 13°14.
It is said to be a 47.7 configuration with 15 connected.

Note that each transmission station 12, 1.3, 14, and 1.5 detects quality deterioration of the transmission line 10, which is the active system, but only the transmission station 15 can issue a system switching instruction.

In other words, it is assumed that the transmission station 15 corresponds to a control station.

First 1. ,,AN interface 2 is currently transmission line 10
is active, and when the receiving section 1 receives a signal from the transmission path 10, the receiving section 1 converts the signal into a format that can be recognized by logic and sends it to the LAN interface 2. The LAN interface 2 further divides the signal into line information and data and sends them to the system control unit 7.

Here, the line information includes information necessary for quality illumination such as undefined code detection and carrier detection.

Then, when the quality of the transmission line 10 between the transmission station 13 and the transmission station 14 deteriorates, the quality monitoring unit 8 detects the undefined code detected by the system control unit 7 from the 711th position 11, +i. Find the number of chords. Furthermore, the quality monitoring unit 8 detects 7 undefined codes for the ili + +near interval! Compare with standard quality monitoring comparison data.

As a result of this comparison, if the undefined code per unit exceeds a predetermined level, the NP gain phase 9 and the system control unit are notified that the quality of the transmission path 10 has deteriorated.

Upon receiving the notification, NP gain face 9 interrupts,
Information is posted to the NP controlling the transmission station 13 in the form of a status signal.

The main point provided with this information is to create a control packet and transmit it to the control station +, -,! A packet indicating a system switching request is transmitted to 115.

Here, the control packet 1 transmitted from the transmission station 13 is recognized by all the stations, and each transmission station that receives the control packet sequentially monitors the carrier of the transmission path 1.
Start LI. In other words, 1. The AN interface 5 monitors the carrier on the transmission line 11 and waits for (fifth speed'!'fU11 to become active).

The transmission station 15 which received the control packet from the transmission station 13,
Transmits the manually-generated data from the receiving section 1 of the bmi-transmission 7810.
J8] 1 to the transmitter 6.

At this time, when the receiving section 4 of the transmission station 15 detects a carrier, the system is switched to (Lmi transmission path 1) by the L/N interface 5.

On the other hand, in the transfer stations 13 and 4 adjacent to the transmission path whose quality has deteriorated, a return loop is formed at the point in time when the receiving section 4 detects a carrier from the transfer path 11, respectively.

However, if the transmission station 15 has already finished switching the transmission line 10 or is controlling another line, the transmission station 15 will ignore the IJI switching request from the transmission station 13. However, more appropriate control is performed according to the priority order of processing.

In this way, in this practical example, the undefined coats on the current system are constantly monitored, and the undefined coats between 11101117 and 11101117 are constantly monitored. ≧Compare the code with comparison data for quality monitoring that serves as a criterion. As a result of the comparison, if the per unit definition code exceeds the treasure level, the transmission station adjacent to the transmission line where the quality has deteriorated will start a prayer return loop according to instructions from the control station. I tried to form it.

Therefore, it is possible to use the transmission line in a high-quality condition, and furthermore, it is possible to prevent communication from being interrupted from the time a line failure occurs until the communication is opened. The reliability of information transmission is maintained by
j is done.

[Effects of the Invention 1] As explained above, according to the loop martial arts 15 system of the present invention, it is possible to improve the G/M property of information transmission.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing details of a transmission station according to an actual example of the loop communication system of the present invention, and Fig. 2 shows the overall configuration for explaining the operation of the loop martial arts 13 system. It is a country. 1... 13 parts of receiver (R1) 2...1. AN interface, 3... Sending (second part (1'l)) 4... Receiving part (R2), 5... N interface, 6... to 1.
Transmitting unit (T2), 7... System control unit, 8... Quality initiating unit, 9 - Note processor (NP) interface, 1
0.11...1m feed route.

Claims (1)

[Claims] (1) A plurality of stations including at least one control station are connected in a loop via a double transmission path, and when a failure occurs in the transmission path, the control station sends a loopback instruction to transmit the transmission. In a loop communication system in which the station adjacent to a faulty point on the transmission path enters a loopback state and reconfigures the transmission path, each station detects an undefined code on the transmission path and prevents quality deterioration of the transmission path. system control means that instructs the connection or switching of the transmission line based on the notification of Comparing the undefined code per unit with reference quality monitoring comparison data, and notifying the system control means of quality deterioration of the transmission path when the undefined code per unit exceeds a predetermined level. Loop type communication characterized by comprising a monitoring means, and a comparison result holding means having a timer for giving the reference quality monitoring comparison data and the unit time, and holding the comparison result by the quality monitoring means. system.