JP4577164B2 - Relay transmission system - Google Patents

Description

  The present invention relates to a relay transmission system that performs relay transmission using a repeater.

  Several hundred Mb / s for monitoring / control signal transmission for monitoring / controlling relay stations of large-capacity transmission systems, and for collecting / transmitting data such as meteorological observations and earthquake observations at multiple points It is necessary to insert / extract relatively low-speed signals such as the following at each repeater. As such a relay transmission system, one using a regenerative repeater that regenerates and relays a signal once is known (for example, see Patent Document 1).

  This conventional relay transmission system includes a land terminal device having a control signal generating circuit for outputting an optical control signal and a signal receiving circuit for receiving and processing an optical measurement signal; an optical device for converting the optical control signal into an electrical control signal A submarine observation device comprising: an electrical / electrical conversion circuit; an electrical / optical conversion circuit that converts electrical control signals and electrical measurement signals into optical signals; and an optical fiber cable that passes the optical measurement signals through the device; An optical submarine cable is provided.

JP-A-7-202804

  Since the relay transmission system disclosed in Patent Document 1 has a multi-stage connection of seabed observation devices as regenerative repeaters, even if a repeater fails at one location, the relay repeater must be relayed by the failed repeater. Transmission of signals from the repeater becomes impossible, affecting the communication function of the entire system. For this reason, in order to achieve desired reliability as a whole system, it is necessary to make the components of the repeater highly reliable, and there is a problem that there are problems in terms of the feasibility and cost of the components.

  The present invention has been made to solve the above-described problems, and it is an object of the present invention to improve the reliability of the relay transmission system without the need to make the components of the repeater highly reliable. .

In the relay transmission system according to the present invention, a transmitting station, a plurality of repeaters, and a receiving station are connected via a transmission path, and a signal transmitted from the transmitting station is relayed by the respective repeaters to the receiving station. A relay transmission system for transmitting, wherein each of the repeaters includes a receiving unit that receives and reproduces a signal input to the own repeater, a transmission unit that transmits a signal output from the own repeater, and the receiving unit. A path selection unit for selecting the transmission unit for outputting the regenerated signal, and a passage path for passing the signal input to the own repeater and outputting the signal from the own repeater, and each of the repeaters The passing path is connected to the transmitting unit or the receiving unit of the adjacent repeater via the transmission path, and the route selecting unit of each repeater is connected to the route selecting unit of the next-stage repeater If no failure has occurred, And selects the transmission unit connected to the receiving portion of the vessel.

  The present invention can improve the reliability of a relay transmission system as a system.

Embodiment 1 FIG.
The relay transmission system according to the first embodiment of the present invention has a duplicated regenerative relay path composed of a receiver, a transmitter, and a path selector in each repeater, and a passing path for bypassing the regenerative relay path Is provided in each repeater, and the passing route and one of the regenerative repeater routes are connected between adjacent repeaters, so that the reliability of the system can be improved.

1 is a block diagram showing a relay transmission system according to Embodiment 1 of the present invention.
In FIG. 1, 1 is a repeater, 2 is a signal passing input end, 3 is a signal passing output end, 4a and 4b are signal receiving ends, 5a and 5b are signal transmitting ends, 6a and 6b are receivers, 7a and 7b are transmitters, 8 is a route selection unit, 9 is a signal processing unit, 10 is a device to be monitored, 11 is a passage route having a passage input end 2 and a passage output end 3, and 12a, 12b and 12c are transmission routes. It is. The reception ends 4a and 4b and the receivers 6a and 6b constitute a reception unit, and the transmission ends 5a and 5b and the transmitters 7a and 7b constitute a transmission unit.

  Here, the path selection unit 8 is a switch that switches the path in a semi-fixed manner, or a high-speed switch that selects an appropriate path for each time-division multiplexed signal, and is a LAN (Local Area Network). It is possible to use a general-purpose switch as used in The monitoring target 10 is, for example, a monitoring / control target device or an observation device that performs weather observation / earthquake observation. The passage path 11 is a single optical fiber. The transmission paths 12a, 12b, and 12c are parallel transmission paths, and use three optical fibers bundled in the same cable. However, the present invention is not limited to this. For example, three optical fiber cables may be used, and three signal lights having different wavelengths multiplexed in one optical fiber may be used. It can also be used as three independent transmission paths (so-called optical paths).

  In FIG. 1, 100 is a transmitting station, 101a, 101b and 101c are signal transmitting ends, 102a, 102b and 102c are transmitters, 103 is a receiving station, 104a, 104b and 104c are signal receiving ends, and 105a and 105b. , 105c are receivers. Note that the transmitting station 100 and the receiving station 103 are terminal devices arranged at both ends of the transmission system.

  Note that a regenerative repeater transmission system is configured as a whole in FIG. However, FIG. 1 shows only three repeaters 1, 1 ′, 1 ″ as repeaters, and a large number of repeaters and transmission paths connected in cascade between the repeater 1 ″ and the receiving station 103. Is not shown. Note that the configurations of the repeaters 1 ′ and 1 ″ are the same as those of the repeater 1, and thus the description thereof is omitted.

  In FIG. 1, the transmission terminals 101a, 101b, and 101c are connected to the passage input terminal 2 and the reception terminals 4a and 4b via transmission paths 12a, 12b, and 12c, and the transmission terminals 5a and 5b and the passage output terminal 3 are passed. The input terminal 2 ′ and the reception terminals 4a ′ and 4b ′ are connected via transmission paths 12b ′, 12c ′, and 12a ′, and are similarly connected to the reception terminals 104a, 104b, and 104c.

Next, the operation will be described.
In the repeater 1, signals input from the receiving ends 4a and 4b are converted from optical signals to electric signals by the receivers 6a and 6b and reproduced. In the so-called regenerative relay system, the signal is a series of repetitive pulses, and when relaying the repetitive pulses, only the temporal position of the pulses and the presence or absence of the pulses need only be correctly reproduced. The signal from the monitoring target 10 is a signal including information on monitoring results and observation results, and is input to the signal processing unit 9 and converted into a data format suitable for transmission. Signals from the receivers 6a and 6b and the signal processing unit 9 are input to the path selection unit 8, and any one of the transmitters 7a and 7b and the signal processing unit 9 is selected as a path for outputting the signal. The signal input to the signal processing unit 9 via the route selection unit 8 is a signal from the receivers 6a and 6b for controlling the monitoring target 10, and the signal processing unit 9 has a data format. Inversely converted and sent to the monitoring object 10.

  In the transmitters 7a and 7b, the electrical signal is converted into an optical signal and transmitted through the transmission terminals 5a and 5b. Further, the signal input to the passage input end 2 is sent to the passage output end 3 through the passage path 11 as an optical signal without being reproduced by the receiver. Then, the signals output from the passage output terminal 3 and the transmission terminals 5a and 5b are sent to the next repeater 1 'via the transmission paths 12a', 12b 'and 12c'. Note that the operation of the repeaters 1 ′ and 1 ″ is the same as that of the repeater 1, and thus the description thereof is omitted.

Next, high reliability by duplication will be described.
The repeater 1 has two paths, a path that is received by the receiver 6a via the transmission path 12b and the receiving end 4a, and a path that is received by the receiver 6b via the transmission path 12c and the receiving end 4b. Even when a failure occurs in one path and the signal cannot be normally received, the signal can be received through the remaining one path. Similarly, the transmitter 7a transmits the signal via two paths, that is, a path that transmits via the transmission end 5a and the transmission path 12b ′, and a path that transmits via the transmitter 7b via the transmission end 5b and the transmission path 12c ′. If either one of the routes is normal, transmission can be performed. Further, the route selection unit 8 is difficult to duplicate due to its role. When a failure occurs in the route selection unit 8, the repeater 1 falls into a state in which neither reception nor transmission is possible, but the route selection unit 8 passes through the passage route 11. Thus, communication between the transmitting station 100 and the repeater 1 ′ can be continued. Thereby, communication other than the repeater 1 can be continued.

  Similarly, when a failure occurs in the route selection unit 8 ′ and reception and transmission of the signal at the repeater 1 ′ become impossible, the transmission signal from the repeater 1 from the transmission end 5a is not transmitted. Communication can be maintained using a path from the transmission path 12b ′ to the receiving end 4b ″ of the repeater 1 ″ via the passage path 11 ″ of the repeater 1 ′. In this way, when the repeater fails, the communication function can be maintained by passing through the fail repeater via the passage paths 11, 11 ′, 11 ″, so that the communication function of the entire system can be maximized. As long as possible. Specifically, communication can be maintained as a system unless two adjacent repeaters become incapable of communication.

  Therefore, some of the receivers 6a, 6b, 6a ′, 6b ′, 6a ″, 6b ″ and the transmitters 7a, 7b, 7a ′, 7b ′, 7a ″, 7b ″ have failed. In this case, even when any of the route selection units 8, 8 ′, 8 ″ fails, it is possible to maintain the communication function by using the normal route as much as possible.

  FIG. 2 shows a case where the receiver 6b, the path selection unit 8 ', and the transmitter 7a' 'fail as an example of the case where the communication function of the system can be maintained. Paths that are interrupted by these failures are indicated by broken lines with arrows. A normally communicable route is a route indicated by a solid line with an arrow. The signal transmitted from the transmitter 102b in the transmission station 100 is transmitted to the transmission path 12b, the receiver 6a, the path selection unit 8, the transmitter 7a, the transmission path 12b ′, the passage path 11 ′, the transmission path 12a ″, and the receiver. It is possible to transmit to the receiving station 103 via 6b ′, path selection unit 8 ″, transmitter 7b ″, and transmission path 12c ′ ″. Considering the case where three independent regenerative relay systems are run side by side without such redundancy, each system becomes incapable of communication due to a single failure. On the other hand, in the first embodiment according to the present invention, there are many cases where communication can be maintained even in the case of failure at a plurality of locations, and there is an effect of dramatically improving reliability. In particular, the effect is large in a transmission system having a large number of relays.

  Note that, as in the first embodiment according to the present invention, in a repeater in a system in which a signal needs to be inserted / extracted by each repeater, a signal as a transmission destination of a signal reproduced by a receiver regardless of the presence or absence of redundancy. A route selection unit for selecting a processing unit or a transmitter is required, and it is not necessary to add a new route selection unit for redundancy. Therefore, the configuration shown in FIG. 1 can be realized as a relatively simple configuration in which the receiver and transmitter are duplicated and the passage path 11 is provided.

  As described above, in the relay transmission system according to Embodiment 1 of the present invention, each repeater has a duplex regenerative repeater path having a receiver that receives and reproduces a signal, a transmitter, and a path selector. In addition, each repeater is provided with a pass route for bypassing the regenerative repeater route, and the pass route and one of the regenerative repeater routes are connected between adjacent repeaters. Thereby, even when a failure occurs in a receiver, a transmitter, a path selection unit, etc., the communication function of the system can be maintained using a normal path, and the reliability of the system can be improved.

  In the first embodiment described above, a configuration example of a system in which a receiver, a transmitter, and a transmission path are duplexed has been described. However, the redundancy may be further increased. It is also possible to adopt a system configuration that can withstand a failure of a route selection unit in one repeater.

  In the first embodiment described above, a linear repeater that does not perform regenerative relay may be inserted into a part of the transmission path in the regenerative repeater transmission system shown in FIG. The repeater is one of the transmission paths 12a, 12b, 12c, 12a ′, 12b ′, 12c ′, 12a ″, 12b ″, 12c ″, 12a ′ ″, 12b ′ ″, 12c ′ ″. Considered a part. Furthermore, a linear repeater that does not perform regenerative relay may be inserted into the passage path of some repeaters. As a result, the transmission line loss that increases because the regenerative repeater is bypassed can be compensated by the linear repeater, and the communication function of the system can be maintained better.

  In the first embodiment, the transmission path is an optical fiber. However, the present invention is not limited to this, and may be another transmission path such as a coaxial cable. The effect is obtained. In the case of using a coaxial cable, the signal may be transmitted as an electric signal, and the transmitter and receiver may be configured to transmit and receive the electric signal.

Configuration diagram showing a relay transmission system according to Embodiment 1 of the present invention Configuration diagram showing a relay transmission system according to Embodiment 1 of the present invention

Explanation of symbols

1, 1 ′, 1 ″ repeater 2, 2 ′, 2 ″ passing input terminal 3, 3 ′, 3 ″ passing output terminal 4a, 4b, 4a ′, 4b ′, 4a ″, 4b ″ reception Ends 5a, 5b, 5a ′, 5b ′, 5a ″, 5b ″ Transmitting ends 6a, 6b, 6a ′, 6b ′, 6a ″, 6b ″ Receivers 7a, 7b, 7a ′, 7b ′, 7a '', 7b '' Transmitter 8, 8 ', 8''Path selector 11, 11', 11 '' Passing path 12a, 12b, 12c, 12a ', 12b', 12c ', 12a ", 12b'',12c'',12a''', 12b ''',12c''' Transmission path 100 Transmitting station 103 Receiving station

Claims (7)

A transmission system in which a transmission station, a plurality of repeaters, and a reception station are connected via a transmission path, and a signal transmitted from the transmission station is relayed by each repeater and transmitted to the reception station,
Each of the repeaters receives and reproduces a signal input to the repeater, a transmitter that transmits a signal output from the repeater, and a signal reproduced by the receiver A path selection unit for selecting the transmission unit, and a passage route for passing the signal input to the own repeater and outputting from the own repeater,
The passing path of each repeater is connected to the transmitting unit or the receiving unit of the adjacent repeater via the transmission path ,
The route selection unit of each repeater has the transmission unit connected to the reception unit of the next-stage repeater when no failure has occurred in the route selection unit of the next-stage repeater. A relay transmission system characterized by selecting . A transmission system in which a transmission station, a plurality of repeaters, and a reception station are connected via a transmission path, and the signal transmitted from the transmission station is relayed by the repeaters and transmitted to the reception station,
Each of the repeaters receives two signals received and reproduced from the signal input to the own repeater, two transmitters for transmitting the signal output from the repeater, and the signal reproduced by the receiver. A path selection unit that selects one of the transmission units for output, and one passage route that passes a signal input to the own repeater and outputs the signal from the own repeater,
The one passing path of each repeater is connected to one of the two transmitters of the adjacent repeater or one of the two receivers via the transmission path ,
The route selection unit of each repeater has the transmission unit connected to the reception unit of the next-stage repeater when no failure has occurred in the route selection unit of the next-stage repeater. A relay transmission system characterized by selecting . The route selection unit of each repeater selects the transmission unit connected to the passage route of the next-stage repeater when a failure occurs in the route selection unit of the next-stage repeater The relay transmission system according to claim 1 or 2 , characterized by the above. The path selection unit of each repeater, when a failure occurs in the reception unit of the next-stage repeater, among the reception units of the next-stage repeater, other failure has not occurred relay transmission system according to claim 1 or claim 2, characterized in that selecting the transmission unit connected to the receiving unit. Wherein said path selecting section of each repeater when a failure in the transmission of the own repeater occurs claim 1 or claim, characterized by selecting the other of the transmission section a fault has not occurred Item 3. The relay transmission system according to Item 2 .   The relay transmission system according to claim 1, wherein the transmission path is configured by an optical fiber.   The relay transmission system according to claim 1, wherein the transmission path includes a plurality of optical paths by wavelength division multiplexing transmission within an optical fiber.

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