KR100565823B1 - Apparatus for restoring cut off state of optic switch in digital optic relay for mobile communication - Google Patents

Abstract

The present invention provides an apparatus and a method for restoring an optical switch when the optical switch of the mobile communication digital optical repeater enables automatic recovery to a normal operation state by an external control command when the optical switch of the remote optical unit is switched. . To this end, the present invention is a mobile communication digital optical repeater having a first remote optical unit connected to the donor via a first remote optical unit and a first remote optical unit from the donor, the first remote optical unit Is a first optical switch for switching the optical path of the optical signal transmitted from the donor according to a normal operating condition or switching condition by an external control command, and a normal opposite to the first optical switch according to an external control command. A second optical switch switched to an operating condition or a switching condition to form an optical path, and an optical signal distributed from the first optical switch to the second remote optical unit and the second optical switch according to an external control command A splitter, a main optical module for processing and outputting an optical signal from the second optical switch into a control signal and an RF signal, and the main optical module part Receiving a receive optical signals is characterized in that the optical sub-module is configured to retransmit the first optical switch.

Optical Repeater, Donor, Remote Optical Unit, Optical Switch, Transfer, Recovery

Description

Apparatus and method for recovery of optical switch switching in digital optical repeater for mobile communication {APPARATUS FOR RESTORING CUT OFF STATE OF OPTIC SWITCH IN DIGITAL OPTIC RELAY FOR MOBILE COMMUNICATION}             

1 is a view showing a connection configuration of a conventional digital optical repeater for mobile communication,

FIG. 2 is a view showing an appearance of an optical switch applied for branching an optical signal in the remote optical unit shown in FIG. 1;

3A and 3B are views illustrating an internal path in the normal operation of the optical switch shown in FIG. 2 and an internal path in the transfer operation, respectively;

4 is a view showing a path connection state in normal operation in the conventional remote optical unit,

5 is a view showing a path connection state during the transfer operation in the conventional remote optical unit,

6 is a view showing the configuration of the recovery device when switching the optical switch of the digital optical repeater for mobile communication according to the present invention,

7 is a view showing a path connection state in the normal operation of the optical switch according to an embodiment of the present invention,

8 is a view showing a path connection state during the switching operation of the optical switch according to an embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

80,100: remote optical unit, 82, 84: optical switch,

86: optical splitter, 88: main optical module,

90: multiplexer, 92: optical signal processing unit,

94: digital-to-analog converter, 96: sub optical module.

The present invention relates to an apparatus and method for recovering when switching an optical switch of a digital optical repeater for mobile communication, and more particularly, to automatically recover to a normal operation state when switching of an optical switch provided in the optical communication repeater for a mobile communication. The present invention relates to a recovery apparatus and method for switching optical switches of a digital optical repeater for mobile communication.

As is well known, the connection configuration of an optical repeater is connected to a remote device (remote optical unit) via an optical cable from a base station equipment (Master Hub Unit (MHU) or donor) (hereinafter referred to as donor). Unit (ROU)) (hereinafter referred to as remote optical unit).

In the above-described configuration method, the connection between the donor and the remote optical unit is selectively applied to one-to-one connection or one-to-many connection method as needed, and one-to-two connection corresponding to one-to-many connection method. The scheme is as shown in FIG.

As shown in FIG. 1, when two first and second remote optical units 20 and 30 are connected to one donor 10 through an optical cable, the signal flow from the donor 10 is Donor 10-> first remote light unit 20-> second remote light unit 30 in the order of the bar, when the first remote light unit 20 is inoperable state of the second connected to the bottom As it becomes impossible to receive a signal transmitted from the donor 10 in the remote optical unit 30, all the networks connected to one donor 10 become out of service.

Therefore, recently, the first remote light unit 20 in order to maintain the service, the second remote light unit 30 at the bottom even when it is difficult to maintain the service due to an abnormal occurrence such as power failure, the first An optical switch capable of bypassing signals can be installed in the remote optical unit 20.

As shown in FIG. 2, the optical switch 40 includes first to fourth devices in which four optical cables 42-1, 42-2, 42-3, and 42-4 are connected using a 2 × 2 switching method. Switching paths (1 to 4) can be secured, and three signal connection pins of 5V / Signal / GND are provided. Among them, Signal pins are used to enable switching or normal path control of the optical switch from the outside. .

In the path control of the optical switch 40, the path control in the normal operation is the first switching path 1 is connected to the fourth switching path 4, as shown in Figure 3a, the second switching path ( While 2) is configured to be connected to the third switching path 3, in the case of a switching condition by an external control signal, as shown in FIG. 3B, the first switching path 1 is the third switching path 3. ) So that the second switching path 2 can be connected to the fourth switching path 4.

That is, the switching conditions of the optical switch 40 may be various, but the conditions in a general optical repeater are as shown in Table 1 below.

     Condition    Transfer     Recovery or not      blackout    Automatic transfer     Auto recovery    Power off    Automatic transfer    Automatic recovery impossible    Error occurred    Automatic transfer     Auto recovery    Forced transfer      Cut    Automatic recovery impossible

On the other hand, when the optical switch 40 is applied to the remote optical unit, the state in which the optical switch 40 is operating normally is as shown in FIG.

As shown in FIG. 4, the first remote optical unit 20 includes a main optical module 50 having a multiplexer 52 and an optical signal processing unit 54, a digital / analog converter 60, and a sub-light. When the optical switch 40 is normally operated, the module 70 may include a signal transmitted from the donor 10 to the first switching path 1 and the fourth switching path 4 of the optical switch 40. Through the input to the main optical module 50.

The main optical module 50 processes the optical signal passing through the multiplexer 52 into a control signal and an RF signal through the optical signal processing unit 54, and the digital / analog converter 60 performs the main optical module 50. This signal is output after analog conversion from the

On the other hand, the signal from the multiplexer 52 is transmitted to the sub optical module 70, the signal transmitted to the sub optical module 70 is the second switching path (2) and the third of the optical switch 40 It is transmitted to the separate second remote light unit 30 through the switching path (3).

On the other hand, when the switching operation of the optical switch 40 is made, as shown in FIG. 5, the switching path of the optical switch 40 is changed from the first switching path 1 to the third switching path ( 3) and from the second switching path 2 to the fourth switching path 4.

That is, the signal transmitted from the donor 10 does not go through the main optical module 50 via the third switching path 3 from the first switching path 1 of the switched optical switch 40 but directly to the second remote. It is transmitted to the optical unit 30.

Meanwhile, in the main optical module 50 of the first remote optical unit 20, since there is no signal path connected to the donor 10, the main optical module 50-> sub optical module 70-> optical switch A loop path from the first switching path 2 to the fourth switching path 4 to the main optical module 50 of 40 is formed, in which case only a loop of meaningless signal is continuously Will be done.

When the donor 10 applies a predetermined control command to the optical switch 40 to perform a forced change, after the switching of the optical switch 40 is performed, any command signal is output from the donor 10. While not being applied to the remote optical unit 20, the first remote optical unit 20 maintains an infinite state of switching.

Accordingly, in the state where the switching state of the optical switch 40 is maintained, it is impossible to automatically restore the switch by an external control command, so that the operation personnel inevitably have the position where the first remote optical unit 20 is installed. There is a problem that you need to go to the operation initialization state manually.

In addition, when the operating personnel inadvertently forcibly transfers the optical switch 40, the first remote optical unit 20 may stop service until the first remote optical unit 20 is manually switched to an operation initialization state. Since it is impossible to perform the operation, the operation time of the unit is delayed, and there is a problem in that it takes a loss in operating costs.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, and an object thereof is a movement to enable automatic recovery to a normal operating state by an external control command when an optical switch of a remote optical unit is switched. The present invention provides a recovery device and method for switching optical switches of a digital optical repeater for communication.

According to the device of the present invention to achieve the above object, a digital optical repeater for mobile communication having a first remote optical unit connected to the donor via an optical cable from the donor, and a second remote optical unit connected to the donor via the first remote optical unit The first remote optical unit comprises: a first optical switch for switching an optical path of an optical signal transmitted from the donor according to a normal operating condition or a switching condition by an external control command, and an external control command A second optical switch switched to a normal operating condition or switching condition opposite to the first optical switch to form an optical path, and a second remote optical unit and a second optical unit configured to receive an optical signal from the first optical switch according to an external control command. Optical splitter for distributing and transmitting to two optical switches, and processing and outputting the optical signal from the second optical switch into a control signal and an RF signal. Provides an optical module, and, upon receiving the receiving the optical signal from the main photo-optical switch module for mobile communication of digital optical repeater, characterized in that the optical sub-module, consisting of re-transmitting the first optical switch switching the recovery device.

According to the method of the present invention to achieve the above object, the first remote optical unit is connected via the optical cable from the donor, the second remote optical unit is connected via the first remote optical unit to receive the optical signal from the donor An optical signal transmission method of a digital optical repeater for mobile communication, comprising: switching an optical signal from a donor in a first optical switch according to a normal operating condition of a first optical switch provided in the first remote optical unit; Transmitting the signal to the main optical module through a two optical switch and outputting the signal after being processed into a control signal and an RF signal, and receiving the optical signal of the main optical module from the sub optical module of the first remote optical unit; Transmitting to an optical switch and transmitting an optical signal from the first optical switch to a second remote optical unit through an optical splitter; According to the switching condition of the first optical switch, the optical signal from the donor is transmitted from the first optical switch to the optical splitter, and the optical splitter distributes the optical signal to the second remote optical unit and the second optical switch under normal operating conditions. And transmitting the optical signal from the second optical switch to the main optical module, and restoring the optical switch to a normal operating condition according to an external control command. Provided is a recovery method when switching an optical switch of a digital optical repeater for communication.

Hereinafter, the present invention configured as described above will be described in detail with reference to the accompanying drawings.

That is, Figure 6 is a view showing the configuration of the recovery device when switching the optical switch of the digital optical repeater for mobile communication according to the present invention.

As shown in FIG. 6, the recovery apparatus when switching an optical switch according to the present invention includes a first remote optical unit 80 receiving a signal from a donor and a bypass operation from the first remote optical unit 80. It consists of a second remote light unit 100 that receives a signal from the donor.

The first remote optical unit 80 includes a first optical switch 82, a second optical switch 84, an optical splitter 86, a main optical module 88, a digital-to-analog converter 94, and a sub An optical module 96 includes a first switching path 1 of the first optical switch 82 connected to the donor and a second switching path 2 connected to the sub optical module 96. The third switching path 3 is connected to the optical splitter 86, and the fourth switching path 4 is connected to the first switching path 1 of the second optical switch 84.

The second optical switch 84 has a first switching path 1 connected to a fourth switch path 4 of the first optical switch 82, and a second switching path 2 is connected to the second switching path 2. While connected to the optical splitter 86, the third switching path (3) is connected to the main optical module 88.

The optical splitter 86 has an input terminal connected to a fourth switching path 4 of the first optical switch 82, and two output terminals are respectively connected to the second remote optical unit 100 and the second optical switch 84. It is connected to the second switching path (2) of), and the distribution path of the applied optical signal is switched according to the normal operation or switching state of the first optical switch 82 by an external control command.

On the other hand, when the first optical switch 82 and the second optical switch 84 is in a normal operating state in response to an external control command, the second optical switch 84 is in a switched state. When the first optical switch 82 is in a switching state, the second optical switch 84 is configured to maintain a normal operating state.

In the same figure, the main optical module 88 includes a multiplexer 90 and an optical signal processing unit 92. The multiplexer 90 receives an optical signal from the second optical switch 84. Multiplexing is applied to the optical signal processing unit 92 and the sub optical module 96, and the optical signal processing unit 92 performs signal processing by dividing the optical signal from the donor into a control signal and an RF signal.

The digital-to-analog converter 94 converts the RF signal processed through the optical signal processing unit 92 of the main optical module 88 into analog output.

Next, the operation of the present invention made as described above will be described in detail with reference to FIGS. 7 and 8.

First, the operation of the remote optical unit according to the path connection state in the normal operation of the optical switch will be described in detail with reference to FIG. 7.

First, when the first optical switch 82 is in a normal operating state, the first switching path 1 is connected to the second switching path 4, and the second switching path 2 is connected to the third switching path 3. ).

The second optical switch 84 maintains the switching state because the first optical switch 82 is in a normal operating state, and the first switching path 1 is connected to the third switching path 3. The second switching path 2 is connected with the fourth switching path 4.

In this state, the signal transmitted from the donor is transmitted from the first switching path 1 of the optical switch 82 to the second optical switch 84 through the fourth switching path 4, The signal transmitted to the first switching path 1 of the second optical switch 84 is transmitted to the multiplexer 90 of the main optical module 88 through the third switching path 3.

The multiplexer 88 applies an optical signal to the optical signal processor 92 and a sub optical module 96. The optical signal processor 92 converts the optical signal into a control signal and an RF signal. Signal processing is performed, and the digital-to-analog converter 94 converts the RF signal from the optical signal processing unit 92 and outputs the analog signal.

Meanwhile, a signal transmitted to the sub optical module 96 is transmitted from the second switching path 2 of the first optical switch 82 to the optical splitter 86 through the third switching path 3, and the optical The distributor 86 transmits the signal received from the optical switch 82 to the second remote optical unit 100.

Next, the operation of the remote optical unit according to the path connection state during the switching operation of the optical switch will be described in detail with reference to FIG. 8.

First, when the first optical switch 82 is switched to a state switched by an external control command, the first switching path 1 of the first optical switch 82 is connected to the third switching path 3. The second switching path 20 is connected with the fourth switching path 4.

The second optical switch 84 is converted to a normal operation state as the first optical switch 82 is switched to a transfer state, and the first switching path 1 is connected to the fourth switching path 4. The second switching path 2 is connected with the third switching path 3.

In addition, when the first optical switch 82 is switched to a switching condition, the optical splitter 86 has two output distribution paths of the optical signal, the second remote optical unit 100 and the second optical switch 84. Switch to the path.

In this state, the signal transmitted from the donor is transmitted from the first switching path 1 of the first optical switch 82 to the optical splitter 86 through the third switching path 3, and the optical splitter ( 86 divides and transmits an optical signal to the second switching path 2 and the second remote optical unit 100 of the second optical switch 84.

The second optical switch 84 transmits the optical signal received through the second switching path to the multiplexer 90 of the main optical module 88 through the third switching path 3, and the multiplexer 90 ) Transmits the optical signal to the optical signal processor 92 and the sub optical module 96.

On the other hand, the optical signal processing unit 92 performs the control to block the output in order to prevent the output signal from being applied to the digital-to-analog converter 94 because the first remote optical unit 80 is in a transfer state.

In addition, the bus optical module 96 transmits the optical signal received from the multiplexer 90 to the second switching path 2 of the first optical switch 82, the first optical switch 82 is The signal received in the second switching path 2 is transmitted to the first switching path 1 of the second optical switch 84 through the fourth switching path 4, but the second optical switch 84 Since the fourth operating path 4 connected to the first switching path 1 is not connected to the next stage because of the normal operating state, no further signal transmission is performed.

In this state, when the control command is transmitted from the donor, the control command is transmitted from the first optical switch 82 to the main optical module 88 through the optical splitter 86 and the second optical switch 84. As it becomes possible, it is possible to automatically restore the switching state of the optical switch to the normal operation state according to the control operation of the main optical module 88.

On the other hand, the present invention is not limited to the above-described typical preferred embodiments, but can be carried out in various ways without departing from the gist of the present invention, various modifications, alterations, substitutions or additions are common in the art Those who have knowledge will easily understand. If the implementation by such improvement, change, replacement or addition falls within the scope of the appended claims, the technical idea should also be regarded as belonging to the present invention.

As described above, according to the present invention, even when the optical switch installed in the first remote optical unit is switched while the donor and the remote optical unit of the mobile communication digital optical repeater are connected in a one-to-many connection manner, Accordingly, as it is possible to automatically restore the transfer state to the normal operating state, it is possible to automatically recover the transfer state of the remote optical unit from a remote place, and the operation and maintenance of the optical repeater can be easily performed. As a result, it is possible to reduce the operating time and operating cost due to the automation structure.

Claims (10)

In a digital optical repeater for mobile communication having a first remote optical unit connected to the donor via a first cable and a second remote optical unit connected to the donor via an optical cable, The first remote light unit, A first optical switch for switching the optical path of the optical signal transmitted from the donor according to a normal operating condition or switching condition by an external control command; A second optical switch which switches to a normal operating condition or a switching condition opposite to the first optical switch according to an external control command to form an optical path; An optical splitter which distributes and transmits an optical signal from the first optical switch to a second remote optical unit and a second optical switch according to a normal operating condition or a switching condition by an external control command of the first optical switch; A main optical module for processing and outputting an optical signal from the second optical switch into a control signal and an RF signal; And a sub optical module configured to receive an optical signal from the main optical module and to retransmit the optical signal to the first optical switch. The method of claim 1, The first optical switch has a first switching path connected to the donor, a second switching path connected to the sub optical module, a third switching path connected to the optical splitter, and a fourth switching path connected to the second optical switch. Recovery device when switching optical switch of the digital optical repeater for mobile communication, characterized in that configured to be connected to the optical switch. The method of claim 2, The second optical switch has a first switching path connected to the first optical switch, a second switching path connected to the optical splitter, a third switching path connected to the main optical module, and a fourth switching path. Recovery device when switching the optical switch of the digital optical repeater for mobile communication, characterized in that configured to maintain a disconnected state. The method of claim 2, The input terminal of the optical splitter is connected to the first optical switch, and two output terminals are respectively configured to be connected to the second remote optical unit and the second optical switch when switching the optical switch of the digital optical repeater for mobile communication Recovery device. The method according to claim 1 or 4, The optical splitter is configured to distribute and transmit an optical signal to the second optical remote unit and the second optical switch when the first optical switch is switched according to an external control command. Recovery device at switch changeover. The method of claim 1, The main optical module, when the first optical switch is a switching condition according to an external control command, the recovery device when switching the optical switch of the mobile optical digital repeater, characterized in that for performing the control to block the output of the signal-processed RF signal . In the optical signal transmission method of a digital optical repeater for mobile communication in which a first remote optical unit is connected from a donor through an optical cable, and a second remote optical unit is connected via a first remote optical unit to transmit an optical signal from the donor. , In accordance with the normal operating conditions of the first optical switch provided in the first remote optical unit, the first optical switch transmits the optical signal from the donor to the main optical module through the second optical switch in the transfer state, the control signal and RF Processing the signal and outputting the signal; The optical signal of the main optical module is received by the sub optical module of the first remote optical unit and transmitted to the first optical switch, and the optical signal from the first optical switch is transmitted to the second remote optical unit through an optical splitter. step, According to the switching condition of the first optical switch by an external control command, the optical signal from the donor is transmitted from the first optical switch to the optical splitter, and the optical splitter transmits the optical signal to the second remote optical unit and to the normal operating condition. Distributing and transmitting to the second optical switch; Transmitting an optical signal from the second optical switch to the main optical module; And recovering the optical switch from a switching condition to a normal operating condition according to an external control command. The method of claim 7, wherein In the step of transmitting the optical signal from the second optical switch in the normal operating conditions to the main optical module, the main optical module is configured to block the output according to the signal processing of the optical signal of the mobile optical digital repeater Recovery method when switching optical switch. The method of claim 7, wherein The external control command is a control command from the donor, the recovery method when switching the optical switch of the digital optical repeater for mobile communication. The method of claim 7, wherein The external control command is a control command by a manual operation, the recovery method when switching the optical switch of the digital optical repeater for mobile communication.

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