JPH04122127A - System switching information transfer system for optical submarine cable system - Google Patents

Abstract

PURPOSE:To cancel a burst error caused by system switching by using system switching information between terminal station equipments for a transmission reception data on a telemetry bit. CONSTITUTION:When an active system is replaced into a standby system due to a fault or the like, a switching device 20 inputs system switching information to a transmission information interface circuit 1. The system switching information is sent to an opposite station together with a main signal via an MUX circuit 2 and a DMUX circuit 5 of the opposite station processes a telemetry bit and the result is outputted to a reception information interface circuit 6. The similar processing is implemented in the MUX circuit 2 of the opposite station and the DMUX circuit 5 of its own station and its own station detects it that the system switching is implemented in the opposite station. Thus, the receiver side uses the system switching recognition information to cancel a burst error caused by switching.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a system switching information transfer method for an optical submarine cable system, and in particular to a system switching information transfer system for a system having a redundant configuration in a landing station terminal device. Conventional technology] In conventional optical submarine cable systems, alarm information of the end station equipment on the own station side and average error rate for determining whether the line quality is good or bad are detected, and the transmission telemetry in the transmission line frame format is used as operating status information. It is input to the bit and sent to the terminal equipment on the opposite station side. In addition, the operating status information of the terminal device on the opposing station side is detected using the receiving telemetry bit.

However, the system switching information of the redundant component of the signal circuit was not being transmitted or received.

[Problem to be solved by the invention]

In this conventional optical submarine cable system, if the redundant system of the transmitting end station equipment switches from the active system to the backup system due to a failure, the line as a system will be interrupted momentarily, even if only temporarily. , a burst error occurs, but it is impossible to determine whether this burst error is due to system switching.

On the other hand, according to the recent global practice, it is necessary to accurately understand the cause of the error since the obligation to compensate for damages depends on the degree of the error that occurred. Normally, burst errors caused by redundant system switching are not covered by compensation.

However, in the conventional system, even if a burst error occurs due to switching of the redundant system, the status becomes unknown and there is a problem that compensation must be paid.

[Means to solve the problem]

In the optical submarine cable system system switching information transfer method of the present invention, a plurality of landing station terminal devices have a redundant signal circuit configuration of a working system and a protection system, and use telemetry bits of a transmission line frame format. In an information transfer method for an optical submarine cable system that transmits and receives multiple items of operating status information regarding the terminal equipment, each terminal equipment detects the operating status information of its own terminal equipment and converts it into serial data. and a transmission information interface means for inserting into the transmission telemetry bits of the frame format, a reception information interface means for detecting operation status information of the opposite station side terminal equipment from the received reception telemetry bits, and system switching means for performing system switching control between the active system and the standby system and sending system switching information indicating that system switching has been performed to the transmission information interface means; The configuration is such that the information is transmitted and received data on the telemeter saw pit.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. The terminal device of this embodiment includes a MUX circuit 2 that multiplexes digital quaternary signals, and an E10 circuit that converts electrical signals into optical signals.
A converter 3, an O/E converter 4 that converts optical signals into electrical signals, a DMUX circuit 5 that separates multiplexed digital fourth-order group signals, and a serial number of multiple pieces of operating status information on the local station side. It includes a transmission information interface circuit 1 that converts data into data and sends it to a MUX circuit 2, and a reception information interface circuit 6 that detects operation status information on the opposite station side received by a DMUX circuit 5.

The E10 converter 3 and O/E converter 4 of the terminal devices on the local side and the opposite side are connected to each other via an optical cable 7 and an optical submarine repeater 8.

In addition, the MUX circuit 2 is a dual MUX @ path A21 and a MUX circuit B22 that multiplex three digital fourth order signals.
and MUX circuit A21. The MUX circuit B22 has a switching device 20 that switches between active and standby systems of the MUX circuit B22.

Next, the operation will be explained.

The digital fourth-order group signal is multiplexed by a MUX circuit 2, further converted from an electrical signal to an optical signal by an E/○ converter 3, and transmitted to the opposing station via an optical cable 7 and an optical submarine repeater 8. At the opposite station, the signal is converted back into an electrical signal by an O/E converter 4, separated by a DMUX circuit 5, and regenerated into a digital next group signal. This is the operation of the main signal circuit.

Operating status of own station (alarm information and error rate information)
is converted into serial data by the transmission information interface circuit 1 so that it can be inserted into the telemetry bits of the transmission line frame format, and then input to the MUX circuit 2. The operating status information is E10-converted together with the main signal, sent to the opposite station, and separated by the DMUX circuit 5.

The MUX circuit 2 is duplexed, and the MUX circuit A21 and the MUX circuit B22 operate as the active system or the standby system by the switch 20. When the active system is switched to the standby system due to a failure or the like, the switching device 20 inputs system switching information to the transmission information interface circuit 1. This system switching information is transmitted to the opposing station together with the main signal via the MUX circuit 2, and is output to the receiving information interface circuit 6 by processing the telemetry bits in the DMUX circuit 5 of the opposing station.

The same process as described above is performed in the MUX circuit 2 on the opposite station side and the DMUX circuit 5 on the own side, and it is possible to detect on the own side that system switching has been performed on the opposite station side.

The receiving side can also cancel burst errors that occur due to switching by using this system switching recognition information.

〔Effect of the invention〕

As explained above, according to the present invention, system switching information can be transmitted to the telemetry bit, and by receiving this, the opposite station can recognize that system switching has occurred, and further,
This has the effect of canceling burst errors that occur due to system switching.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. 1... Transmission information interface circuit, 2... MUX
circuit, 3...E10 converter, 4...O/E converter,
5... DMUX circuit, 6... Reception information interface circuit, 7... Optical cable, 8... Optical submarine repeater,
2o...Switcher, 21...MUX circuit A, 22...
・MUX circuit B.

Claims (1)

[Claims] A plurality of landing station terminal devices have a redundant signal circuit configuration of a working system and a backup system, and transmit and receive multiple items of operational status information regarding the terminal devices using telemetry bits of a transmission line frame format. In the information transfer method of the optical submarine cable system, each terminal station detects operating status information of its own terminal station, converts it into serial data, and inserts it into the transmission telemetry bit of the frame format. an interface means, a reception information interface means for detecting operating status information of the opposite station terminal equipment from received reception telemetry bits, and a reception information interface means for controlling system switching between the working system and the standby system of the signal circuit to perform system switching. system switching means for sending system switching information indicating that the system switching has been performed to the transmission information interface means, and the system switching information is used as transmission/reception data on the telemetry bit between each of the terminal devices. System switching information transfer method for optical submarine cable systems.