JPS60113547A - Auxiliary signal multiplex system - Google Patents

Abstract

PURPOSE:To improve the transmission efficiency of an auxiliary signal by using the auxiliary signal which is composed of a frame signal as a switch signal, and by transmitting the signal by switching the frame signal when the signal which is transmitted between systems has trouble. CONSTITUTION:For example, when a transmission route 20 has trouble while data and a frame signal are transmitted between transmitters/receivers 1a and 1a', and between 1b and 1b' by using transmission routes 20 and 30, in the transmitter/receiver 1a' of B station, the frame signal disappears, and the frame signal does not flow to a signal line 6. Thus, a controller 3b switches a switch 2b to the transmitter/receiver 1b'. In the transmitter/receiver 1a of A station, the frame signal disappears, and a controller 3a switches a switch 2a to the transmitter/receiver 1b. At this time, both stations A and B switch from an SYS1 to SYS2, and the multiplex communication is executed through the transmission route 30.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for transmitting a
This is related to switching between systems for Reisodesuke territory.

In recent years, optical communications have made remarkable progress, and the performance of devices and equipment has rapidly improved. On the other hand, as part of the % optical communication system, the former V-length multi-electric transmission power system is about to be made into a commercial line. The codes of the transmission lines used in this 7-system optical communication system range from scrambled binary codes to BSI
(Bit 8equenceIndependent
) Codes with f are now being used.

BSI countermeasures can be achieved by preventing the same code from appearing consecutively in the transmission code and devising the code format so that the same code does not occur consecutively.

Generally, in digital communications, the receiving station extracts the clock component from the main signal and uses seven clocks to identify and regenerate all received signals.
If the signal is a series of the same codes (for example, a series of 0 codes), it becomes impossible to draw the clock component from among them, and a code error v' occurs.

Therefore, some method must be used to prevent this redundancy. Conventionally, 12 circuits of stripes and 2 fs were used to suppress consecutive occurrences of the same phrase symbol, but even in this case, there is a probability that the same symbol continues for a long time, so a perfect S1 pair tree is not achieved.

Nowadays, the transmission speed is twice that of transmission 1G, using the code conversion rule of % and '0'.
CMI (, Coded Mark Inversi
on ) code is used to perform BSI conversion. Utilizing an optical communication system in a digital communication system using such a CMI code transmission line is advantageous in terms of high-speed code transmission.

In optical communication 7 system, what is the application value of the system? In order to improve the quality of the signal, an increasing number of systems are being used to transmit multiple auxiliary signals such as dedicated meeting signals and monitoring signals by superimposing them on the main signal.
When transmitting the I code code, the auxiliary signal = 20 MI code rule (CFtV (Coded Ru
(1e Violation)), the signal is superimposed on the CMI-encoded main signal, and the auxiliary signal is superimposed to prevent the number of transmission layers from increasing.

However, light i! Support for i1 system failure 1
It is strongly recommended that the technology for transmitting No. 6 using a different optical communication system be replaced. In this case, the transmission system is switched between the opposing stations, so both stations receive 1g of supplementary power at about the same time.
It is necessary to switch the number. Therefore, the switching information must be exchanged between all games in some way. In conventional systems, such switching information is transmitted as part of the auxiliary signal, so it is necessary to superimpose this switching information on the main signal in addition to many auxiliary signals.
The number of auxiliary signals to be transmitted will be reduced accordingly.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an auxiliary signal multiplexing method that increases the transmission efficiency of auxiliary signals.

According to the present invention, in a transmission system consisting of a plurality of systems in which the main signal is encoded with an iCMI code, an auxiliary signal composed of a frame with a code that violates the CMI coding rule is superimposed on the main signal and transmitted. In the signal multiplexing system, an auxiliary No. 16 multi-sub system is obtained in which the frame information of the auxiliary signal is used as switching information for auxiliary signals between systems.

Next, embodiments of the present invention will be described in detail with reference to the drawings.

Figure 1 ial, fbl, (clij, frame purchase of main signal and auxiliary signal.
The figure is a block diagram showing an example of a system configuration.

Figure 1 shows the entire frame of alU, the main issue, and the CRV (coded this ule) is shown in foreshadowing.
An auxiliary signal is superimposed on H[ of Violation ). In other words, auxiliary (No. 8 is the CI of the main signal on the sending side)
It is superimposed on the main signal by changing the code conversion rule, and has no effect on the transmission speed and code of the main signal. fbl indicates the frame structure of the auxiliary signal used in the present invention. II EI Q is a frame synchronization signal, and 11 to '6+''1 to 1'6 are auxiliary signals, respectively.This frame structure is shown in (C) and is inserted into the frame structure of the auxiliary signal of This is a system-to-system switchover from the auxiliary No. 1d, which was previously used, by removing the inter-system switching Igo No. 8W2.

The frame same signal is used for switching between frames.
As a result, the frame structure is faster because the frames are repeatedly layered, making it easier to transmit signals.

FIG. 2 is a block diagram showing an embodiment according to the present invention.

This embodiment is a two-way communication system in which auxiliary signals are switched and transmitted between two transmission systems 8Y81.8YS20 in both A and B stations in the event of a failure.

In the figure, la, la', lb, and tb/ are transmitting/receiving devices that multiplex and demultiplex main signals and auxiliary signals, respectively, and 2a and 2b are switching devices that switch input and output of auxiliary signals such as meeting signals and monitoring signals. , 3a and 3b are control devices which respectively control the switching devices 2a and 2bk in response to switching signals, and 4 to 11 are signal control devices.

Now, 8Y81 is operational in both A and B stations, and the switching device 2a is connected to the signal line 8qO connected to the transmitter/receiver 1tla (la').
). When the raw signal 8Y81 is sent to the transmitter/receiver device 1a, the transmitter/receiver device la receives the main signal 1'.
CMI (Coded Ma
rk Inversion) and by applying the code conversion rule t-, the auxiliary signal supplied from the switching device 2a is superimposed on the main signal l without shaking the transmission speed. Further, in order to insert the frame signal into the auxiliary signal, a transmission line No. 1d as shown in Fig. 1 (bl) is formed,
It is sent to the transmission path 20.

When the transmitting/receiving device l'a receives the transmission line signal, it monitors the code conversion rule of the transmission line signal, detects an error in the CMI code conversion rule, loses all the auxiliary signals, decodes it, and sends it to the L signal line 1 (
1 to the switching device 2b. The main signal is inversely converted into CMI and sent to 5ysi. Further, a frame signal (F) shown in m1 (fb) in the transmission path signal is also taken out by the transmitting/receiving device la' and applied to the control iron i3b via the signal line 6.

The control device 3b is connected to the transmission/reception device 1a/21)2 to which a frame signal is applied from the signal line 6).

In the above operation, the transmitter/receiver 1a of station A is in speed 16 mode,
The transmitting/receiving device i a/ of the B station was operating in the receiving mode, but when a main signal was generated from the 5Y81 of the B station, the transmitting/receiving 1d device 1b changed to the transmitting mode and the transmitting/receiving device 1h device 1a changed to the receiving mode as described above. behaves similarly.

Here, if a failure occurs in the transmission line 20, the frame signal will no longer be detected by the transmitting/receiving device la' of the B station, and the frame signal will no longer flow through the signal line 6.

The control device 3b thereby switches the switching device 2b to the transmitter/receiver 1d.
Switch to device 1b'. Also, the frame signal is no longer detected in the transmitting device la of the A station, and the control device 3a switches the switching device 2a to the transmitting/receiving device 1b. That is,
At this point, both stations A and B switch from 5YSI to 8YS2 and perform all multiplex communication of auxiliary signals with main 1g 2 via transmission line 3 (l).
xb/ each make the same operating sound.

As described above, in this embodiment, the frame signal of the auxiliary signal is used as switching information and is switched to be transmitted between 8YS2 when the auxiliary information is removed, which was transmitted between 5YSI and 8YS2.

As explained above, according to the present invention, by using the frame signal constituting the auxiliary signal as the switching information for inter-system switching of the auxiliary signal transmitted along with the main No. 18, the auxiliary signal It becomes possible to increase transmission efficiency.

[Brief explanation of the drawing]

Figure 1 is a diagram for explaining the frame structure of the Ikugo-go and the auxiliary Igo-go, and (a) shows the main signal with CF
Figure 2 shows an embodiment of the present invention. l a , l b , l a', lb' -- ---
- transmitting and receiving device, 2a; 2b...Switching device, 3a, 3b...Control device, 20°3o...Transmission line. Agent Patent Attorney Oto Uchihara (6Ln(b) Le/Σ

Claims (1)

[Claims] Main signal = iCMI encoded In multiple transmission systems, an auxiliary signal encoded in a signal format that can be superimposed on the main signal that is structured into a frame and violates the CMI encoding rules is superimposed. In the auxiliary signal multiplexing method, the frame information of the auxiliary signal to be sent is monitored, and based on this frame information, the auxiliary signal is Complementary signal multiplexing method 0, which is characterized by the ability to select a 7-stem system to be multiplexed