JPS62163433A - Error monitor system - Google Patents

Abstract

PURPOSE:To supervise an error rate with a simple equipment by generating the violation of code rules in a monitor signal sent through a monitor line when any transmission error is detected in a transmission line. CONSTITUTION:A coded transmission signal from a transmission terminal station 2 is sent through a transmission line 5 and a repeater 4 to a reception terminal station 3. A monitor transmission terminal station 12 sends a coded transmission code as a monitor signal X. When an error monitor circuit 6 connected to the repeater 4 detects the violation of the code rules of a transmission signal, an output pulse Y is generated. A monitor repeater 14 relays a monitor signal X and when the output signal Y exists, the repeater 14 generates the violation of the code rules (e.g., the inversion of an optional bit) in the monitor signal X and sends the result. A monitor reception terminal station 13 detects the violation of the code rules of the monitor signal to detects the error in the transmission line 5. Then a simple circuit is enough for the repeater 14 and an idle line of the transmission lines 5 is used for the monitor line.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an error monitoring system for monitoring transmission path errors in a digital transmission system.

[Conventional technology]

FIG. 2 is an example of a conventional error monitoring system.

/ is the basic concept of the transmission system, transmitting terminal equipment,
Receiving terminal device 3, relay device≠, transmission line! More oval. After the digital information signal is code-converted into a specific transmission code, such as an OMI code, by the transmitting terminal equipment, it is sent to the transmission path! and is transmitted to the receiving terminal device 3 via the repeater @+1.

Here, the relay device Hiro is used to reproduce and relay the transmission signal.

The receiving terminal device 3 decodes the received transmission signal into the original digital information signal.

The error monitor circuit t is connected to the receiving terminal device 3 or the relay device≠
Detects violation of coding rules in the received coded signal and generates an error pulse. A pulse counter 7 counts error pulses generated from the error monitor circuit 6.

Since the transmission path bit rate is known, the error detection rate is calculated from the number of error pulses observed within a certain period of time, and when the error rate is worse than a preset error rate, it is sent as an alarm signal by the multiplexer r into a dedicated frame structure. and sent to the monitoring device.

A monitoring line 10 is configured by the multiplexing device t and the monitoring device 2.

[Problem to be Solved by the Invention 3] As described above, in the prior art, I0 monitoring is performed by a monitoring device located on the receiving terminal device side, but the following drawbacks occur.

(1) It is necessary to install a pulse counter for each repeater. This pulse counter requires a timing function to set a fixed observation time, so it is very important.

(2) A monitoring line (often a low bit rate metallic line) with a different bit rate and frame structure than the transmission system line is required.

(3) Error monitoring on the transmitting end station side is not possible.

(4) It is impossible to monitor the value of the AFL rate itself;
Accurate monitoring is not possible.O An object of the present invention is to provide an error monitoring system that solves the above-mentioned drawbacks.

[Means for solving problems]

The present invention transmits error detection information detected by an error monitor circuit connected to a relay device or a receiving end station device in bit units, and the error detection information from each error monitor circuit is transmitted in a simple manner into one line. It is multiplexed and transmitted on a monitoring line, and centrally monitored by a monitoring device.

The conventional technology is that it uses a monitoring line consisting of the same transmission equipment and transmission line as the transmission line of the transmission system itself, that it can centrally monitor accurate error rates, and that the central monitoring location is on the transmitting side, The difference is that it can be set arbitrarily on either receiving side.

〔Example/〕

Figure 1 shows the features of the present invention! This is an example of 8g/, and numbers from / to O are equivalent to the same numbers in FIG. /2 is a monitoring transmitting terminal device, 13 is a monitoring receiving terminal device, and /Hiro is a monitoring relay device, forming a monitoring line /l.

The operation will be explained below. Monitoring transmitter terminal #/2 transmits the encoded transmission code as a monitoring signal. This transmission code is equivalent to the transmission code used in the transmission system itself. Next, the monitoring relay device rIt, /lI- receives the monitoring signal, and when the output signal of the error monitor circuit B is q/〃, it generates a coding rule violation for the monitoring signal and transmits it vertically. . The monitoring signal passed through an arbitrary number of stages of this monitoring relay device/g and then decubitus/relayed is received by the monitoring receiving terminal device/3. Monitoring receiving terminal equipment 1
In step 3, errors in the transmission system are monitored by detecting code rule violations from the received monitoring signal.

This shows the logical function of the relay device l≠ using an OMI code or DMI code as a transmission code, where X is a monitoring signal transmitted from the monitoring transmitter 12 using an OMI code or DMI code, and Y is an error monitor circuit. output signal,
2 is an output signal of the monitoring relay device. Error monitor circuit When an error in the transmission line is detected, the output signal Y becomes X.
It becomes Xl〃.

Now, as the monitoring signal X, 'ON' as shown in Fig.
Assuming that a repeated signal of and Nl2 ((in 3MI code or DMI code, it means a series of Q mark signals) is used), when the output signal Y of the error monitor circuit B is The monitoring signal X is inverted, and a violation of the OMI code or DMI code code rule occurs in the output signal Z of the monitoring relay device /≠.

The above is an explanation of the operation. According to the invention, even when monitoring relay devices are connected in multiple stages, the error monitor circuit monitors the transmission path when it detects an error without synchronizing the transmission path frame. Error detection information can be multiplexed by a simple method of generating a coding rule violation in any l bits of a signal.

Further, since the monitoring line has the same transmission code and bit rate as the transmission system itself, it is possible to use, for example, an empty line of the transmission system.

In addition, by using an empty line in the opposite direction,
2 is installed on the side of the receiving terminal device 3, and the monitoring receiving terminal device/3 is installed on the side of the transmitting terminal device, it is possible to monitor errors on the transmitting terminal device side.

A switch /j is inserted between the error monitor circuit 6 and the monitoring relay device /lA. By setting the input (AIBIO) of this switch /j to %O, it is possible to prohibit the monitoring relay device 1II- from generating a code rule violation. With this configuration, any errors in the transmission section! 7 monitoring is possible. For example, during normal times, input terminals A and B.

By setting C to %/I, all transmission sections are monitored for errors, and when an error occurs, the input terminal AIBto is arbitrarily set to 0. It will be a limited edition performance.

[Embodiment 3] Fig. 1 is a third embodiment of the present invention, and numbers b, / to o are the same as the same numbers in Fig. 1. 2.2 is a monitoring transmitting terminal device, 23 is a monitoring receiving end-to-end device, and 2.2 is a monitoring relay device, which constitutes a monitoring line/lt-.

The operation will be explained below. The monitoring transmitter terminal fL12 is a pulse pattern generator, 2! A specific pulse pattern generated frequently is transmitted as a monitoring signal.

Next, monitoring relay device 2! /L receives the monitoring signal, and when the output signal of the error monitor circuit 2 is 11'', it inverts and relays the monitoring signal.It passes through this monitoring relay device 241 in any number of stages and is externally transmitted/relayed. The monitored signal received by the monitoring receiving terminal device 23 is sent to the i6 detector 26, which combines this pulse pattern with the pulse pattern generated by the pulse pattern generator 2J-. A mismatch is detected.

Error monitoring is performed as described above. For example, if the OMI code is used in the transmission system, the pulse pattern may be 1010/...'O, 'It
□ If N and %l are generated alternately, it becomes equivalent to the all note mark I state in the OMI code, so as in the first embodiment, it is possible to use the empty line of the transmission system as a monitoring line. be.

[Example≠]

FIG. 3 shows an embodiment of the present invention, and similarly to FIG. 3, the error monitor circuit 6 and the monitoring relay device 24 are shown in FIG.
It comes out with a switch/o inserted between L and L.

This switch/o makes it possible to prohibit inversion of the monitoring signal in the monitoring relay device 2≠.

〔Example! ]

Figure 6 is the first example of the present invention! In this embodiment, / to t are equivalent to the same numbers in FIG. 33 is a monitoring receiving terminal device, and 3≠ is a monitoring relay device, which constitutes a monitoring line //.

The operation will be explained below. The monitoring relay device [1j4t receives the monitoring signal from the front monitoring relay device, and when the output signal strength of the error monitor circuit t is β/〃, it inserts q/〃 into the monitoring signal and relays it. However, if there is no pre-monitoring relay device, the output signal of the error monitor circuit 2 is directly output as the i-monitoring signal. The monitoring signal that has been reproduced and relayed through an arbitrary number of stages of the monitoring relay device is finally received by the monitoring receiving end interlocking RIT 33, and the number of pulses is counted. Error monitoring is performed as described above.

[Embodiment 2] FIG. 7 shows a sixth embodiment of the present invention, and like FIG. 3, in FIG.
A switch /J'' is inserted between the two. This switch it makes it possible to prohibit insertion of Sl 7 // into the monitoring signal in the monitoring relay device 34t.

〔Effect of the invention〕

As explained above, according to the present invention, it is not necessary to install a 1-pulse counter for each relay device, and monitoring signals from each relay device can be multiplexed with a small number of logic circuits, thereby increasing the space available in the transmission system. Since the line can be shared as a monitoring line, a significant reduction in the amount of hardware can be achieved.

In addition, it is possible to centrally monitor a transmission system installed over a long distance, and the monitoring location can be arbitrarily set on either the transmitting end station side or the receiving end side.

Furthermore, since the monitoring section can be freely set, it is possible to limit the location of the failure. Furthermore, since the error rate can be directly and accurately monitored, it is also useful for preventive maintenance of the system.

[Brief explanation of drawings]

Figure 1: Seventh embodiment; Figures 1-2: Examples of bad implementation of the first embodiment; Figures 1-3: Diagrams explaining the operation of Figures 1-2. , Fig. 2...Conventional example, Fig. 3...Second
Example, Figure μ...Third Example, Figure J...Example ≠, Figure...! Example of FIG. 7, No. 2
Example. l...Transmission system, λ...Transmission terminal device, 3...
・Receiving terminal equipment, Hiro...relay equipment,! ...-transmission line,
2...Error monitor circuit, 7...Pulse counter,
! . . . multiplexing device, ri . . monitoring device, 10. //・
... Monitoring line, /2,22... Monitoring transmitting terminal equipment,
/ 3-23+ 37...Monitoring receiving terminal device, 14
L, Ko≠*31A...Monitoring relay device, lJ''...
Switch, 2J″...Pulse pattern generator, 2t・
...Error detector.

Claims (6)

[Claims] (1) In a transmission system that is composed of a transmitting end station device, a receiving end station device, a relay device, and a transmission line and transmits digital signals using a coded transmission code, the connection to the receiving end station device or the relay device is performed. an error monitor circuit that detects a code rule violation of a transmission code; a monitoring transmitting terminal device that transmits the encoded transmission code as a monitoring signal; and an output signal of the error monitor circuit that receives the monitoring signal. is "1", a monitoring relay device generates a coding rule violation for the monitoring signal and relays it, and a monitoring signal reproduced and relayed by the monitoring relay device is received and a coding rule violation is detected. An error monitoring system comprising: a monitoring receiving terminal device. (2) The error monitoring system according to claim 1, further comprising means for prohibiting the occurrence of a code rule violation in the monitoring relay device. (3) In a transmission system that is composed of a transmitting end station device, a receiving end station device, a relay device, and a transmission line and that transmits digital signals using a coded transmission code, a connection to the receiving end station device or the relay device is provided. an error monitor circuit that detects a code rule violation of a transmission code, a pulse pattern generator that generates a specific pulse pattern, a monitoring transmitting terminal device that transmits the pulse pattern as a monitoring signal, and a monitoring signal that transmits the monitoring signal. a monitoring relay device that inverts and relays the monitoring signal when the output signal of the error monitor circuit is “1”; and a monitoring device that receives the monitoring signal reproduced and relayed by the monitoring relay device. An error monitoring system comprising: a receiving end station device; and an error detector that detects a mismatch between the received pulse pattern and the pulse pattern of the pulse pattern generator. (4) The error monitoring system according to claim 3, further comprising means for prohibiting inversion of the monitoring signal in the monitoring relay device. (5) In a transmission system that is composed of a transmitting end station device, a receiving end station device, a relay device, and a transmission line and transmits digital signals using a coded transmission code, the connection to the receiving end station device or the relay device is performed. and receives a monitoring signal from an error monitor circuit that detects a violation of the coding rule of a transmission code and the monitoring relay device, and when the output signal of the error monitor circuit is "1", the monitoring signal is set to "1".
1", and a monitoring receiving terminal device that receives the monitoring signal reproduced and relayed by the monitoring repeating device and counts the received pulse signal. An error monitoring system characterized by: (6) In the monitoring relay device, “1” to the monitoring signal
6. The error monitoring system according to claim 5, further comprising means for prohibiting insertion of ".