JP3070664B2 - Line protection control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a line protection control system in a transmission line, and more particularly to a line protection control system (hereinafter, referred to as a 1 + 1 line protection control system) in a transmission line having a working system and a protection system. .

[0002]

2. Description of the Related Art As a conventional example of this type, there is a 1 + 1 line protection control system having a configuration as shown in FIG.

The conventional 1 + 1 line protection control system includes a switching unit 20, an active line interface unit 21, and a standby line interface unit 22, as shown in FIG.

[0004] More specifically, the switching unit 20 includes a transmission buffer 201 and two reception buffers 202 and 20.
3, a line protection control unit 204, and a selection circuit 205.

[0005] The transmission buffer 201 receives the signal in the upstream direction, and
And output to the standby line interface unit 22. Two receive buffers 202 and 2
03 is the active line interface unit 2
1 and a signal in the downstream direction from the standby line interface unit 22,
To be sent to

A line protection control unit 204
Receives a working failure signal from the working line interface unit 21, a protection failure signal from the protection line interface unit 22, an external command switching request signal and an external switching request signal, and Of the line interface unit 21 and the standby line interface unit 22, the side on which a signal is selected is set online, and the side on which no signal is selected is set off-line. Further, the line protection control unit 2
Reference numeral 04 transmits an online setting signal to the side set online.

Specifically, when the active line interface unit 21 is set to online, the line protection control unit 204 transmits an active online setting signal to the active line interface unit 21. When the standby line interface unit 22 is set online, a standby online setting signal is transmitted to the standby line interface unit 22. The active system online setting signal and the standby system online setting signal are supplied to the selection circuit 205.
Has also been sent.

The selection circuit 205 receives an active online setting signal and a standby online setting signal from the line protection control unit 204, and receives any one of the signals from the receiving buffers 202 and 203 (that is, the active line interface unit 21). And any of the signals from the standby line interface unit 22) as a signal in the downstream direction.

An active line interface unit 21 and a standby line interface unit 22
Are receiving units 211 and 221 for receiving upstream signals from the switching unit 20, respectively;
The transmission unit includes transmission units 212 and 222 for transmitting a downstream signal from the transmission path to the switching unit. Further, when the active line interface 21 and the standby line interface unit 22 are set online according to the active online setting signal and the standby online setting signal, respectively, the active line interface 21 and the standby line interface unit 22 turn on the online LED and monitor all faults. When the offline setting is made, the process of turning off the online LED and stopping the process in the fault monitoring unit which does not require the process is stopped.

In the conventional 1 + 1 line protection control system having such a configuration, a signal transmitted from the active line interface unit 21 and a signal transmitted from the standby line interface unit 22 are determined depending on whether or not there is a failure. Select one of the signals and
It can be transmitted as a downstream signal.

In the conventional 1 + 1 line protection control system, the transmission and reception of signals between the units is performed by a transmission buffer (2
01, 212, 222) and the receiving buffer (202, 203, 211, 221) of the unit on the receiving side. At this time, in the conventional 1 + 1 line protection control method, the active line interface unit 21 and the standby line interface unit 22 transmit and receive data on both the upstream side and the downstream side regardless of the online or offline state. The same signal is transmitted and received via the buffer.

[0012]

However, the above-mentioned 1 + 1 line protection control system of the related art has a problem that the power consumption is high as described in detail below.

Generally, CMOS devices are used for transmission and reception buffers for interfacing between units. As is well known, this CMOS device has a feature that a current does not flow when an input value is fixed, but a current flows each time the input value is switched.

By the way, in the conventional 1 + 1 line protection control system, either the working line interface unit 21 or the standby line interface unit 22 in the off-line state is connected to the downstream in the same manner as the unit set online. Transmitting and receiving signals in the direction. Accordingly, the two receiving buffers 202 and 2 of the switching unit 20
03 receives a signal from an off-line unit.

Here, the signal in the downstream direction from the unit in the off-line state is not selected by the selection circuit 205 of the switching unit 20 as described above.

Nevertheless, in the conventional 1 + 1 line protection control method, since signals are transmitted and received in the downstream direction between the unit in the off-line state and the switching unit 20, the transmission related to the downstream direction is performed. And the receiving buffer also operates. Therefore,
As described above, in the transmission and reception buffers, current flows in the operating state, so that the conventional 1 + 1 line protection control system consumes more power than necessary.

Accordingly, an object of the present invention is to provide a line protection control system with low power consumption in order to solve the above-mentioned problems of the conventional example.

[0018]

In order to solve the above-mentioned problems, the present invention focuses on the fact that when a fixed value is input to the transmission and reception buffers, no current flows through the transmission and reception buffers. The following means are provided.

That is, according to the present invention, a working line interface unit connected to a working transmission line, a protection line interface unit connected to a protection transmission line, the working line interface unit and the protection line interface unit are connected. A line protection control system comprising: a switching unit for setting one of the system line interface units to an offline state and transmitting a signal from the other in a downstream direction,
The working line interface unit and the protection line interface unit convert the signals from the working transmission line and the protection transmission line into fixed value signals having fixed values, respectively, and transmit the signals in the downstream direction. The active line interface unit and the standby line interface unit detect the state when the offline state is set, and output the fixed value signal to the fixed value signal. The means provides a line protection control scheme characterized by transmitting in the downstream direction.

Further, according to the present invention, in the line protection control method, the working line interface unit and the protection line interface unit each transmit the signal in the downstream direction to the switching unit. It comprises a transmission buffer, and among the working line interface unit and the protection line interface unit, the one of the fixed value output means in the offline state sends the fixed value signal to the transmission buffer, The transmission buffer transmits the fixed value signal to the switching unit, thereby obtaining a line protection control method.

According to the present invention, in the line protection control method, the switching unit includes two reception buffers for receiving signals from the active line interface unit and the standby line interface unit, respectively. Wherein the receiving buffer for receiving a signal from one of the active line interface unit and the standby line interface unit in the off-line state receives the fixed value signal. A control scheme is obtained.

Further, according to the present invention, in the line protection control method, the fixed value signal is a signal capable of reducing power consumption of the transmission buffer and the reception buffer. A control scheme is obtained.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

The 1 + 1 line protection control system of the present embodiment has a configuration as shown in FIG.

That is, as shown in FIG. 1, the 1 + 1 line protection control system of the present embodiment employs a switching unit 10 and an active line interface unit 11.
And a standby line interface unit 12.

More specifically, the switching unit 10 comprises a transmission buffer 101 and two reception buffers 102 and 10
3, a line protection control unit 104, and a selection circuit 105.

The transmission buffer 101 receives the signal in the upstream direction, and
And to the standby line interface unit 12. Two receive buffers 102 and 1
03 is the active line interface unit 1
1 and a signal in the downstream direction from the standby line interface unit 12,
To be sent to

The line protection control unit 104
Receives the active system failure signal from the active system line interface unit 11, the standby system failure signal from the standby system line interface unit 12, and the external command switching request signal and the game switching request signal. Of the line interface unit 11 and the standby line interface unit 12, the side on which a signal is selected is set online, and the side on which no signal is selected is set offline. Further, the line protection control unit 1
Reference numeral 04 transmits an online setting signal to the side set online.

More specifically, when the active line interface unit 11 is set to online, the line protection control unit 104 transmits an active online setting signal to the active line interface unit 11. When the standby line interface unit 12 is set online, a standby online setting signal is transmitted to the standby line interface unit 12. The active system online setting signal and the standby system online setting signal are supplied to the selection circuit 105.
Has also been sent.

The selection circuit 105 receives the active system online setting signal and the standby system online setting signal from the line protection controller 104, and receives one of the signals from the receiving buffers 102 and 103 (ie, the active system line interface unit 11). And any one of the signals from the standby line interface unit 12) in the downstream direction.

The active line interface unit 11 and the standby line interface unit 12
Are respectively receiving units 111 and 121 for receiving an upstream signal from the switching unit 10,
The transmission units 112 and 122 for transmitting the downstream signal from the transmission path to the switching unit and the function of forcibly fixing the downstream signal to a fixed value and outputting a fixed value signal are provided. The fixed value output circuits 113 and 123 are provided. Further, when the active line interface 11 and the standby line interface unit 12 are set online according to the active online setting signal and the standby online setting signal, respectively, the active line interface 11 and the standby line interface unit 12 turn on the online LED and monitor all faults. When the offline setting is performed, the process of turning off the online LED and stopping the process in the fault monitoring unit which does not require the process is stopped, and the fixed value output circuits 113 and 123 are operated to output the fixed value signal in the downstream direction. That is, when the active line interface unit 11 and the standby line interface unit 12 are set offline, the transmission buffer 112
, And 122, a fixed value signal is input to the receiving buffer 1 on the switching unit 10 side.
A fixed value signal is also input to 02 and 103.

Next, as an example of the operation of the 1 + 1 line protection control system according to the present embodiment having such a configuration, as an example, first, the active line interface unit 11 is online, The unit has failed,
The case where the standby line interface unit 12 is brought online will be described.

First, the upstream signal input to the switching unit 10 is bridge-transmitted to the active line interface unit 11 and the standby line interface unit 12 via the transmission buffer 101. Active line interface unit 11
Is received via the reception buffer 111, and similarly, the standby line interface unit 12 receives the data via the reception buffer 121.

In this example, since the active line interface unit 11 is in the online state, the active line interface unit 11 outputs the signal received from the active transmission line to the fixed value output circuit 113 in the downstream direction. Is transmitted to the switching unit 10 via the transmission buffer 112 without being converted into a fixed value signal. On the other hand, since the standby line interface unit 12 is in the offline state, the standby line interface unit 12 outputs the signal received from the standby transmission line to the fixed value output circuit 123.
And forcibly converts the signal into a fixed value signal, and sends the signal to the switching unit 10 via the transmission buffer 122.

The switching unit 10 receives a signal as it is received from the active transmission line via the reception buffer 102 from the active line interface unit 11 and also receives a fixed value signal from the standby line interface unit 12. The data is received via the reception buffer 103. The selection circuit 105 receives the respective signals received from the active line interface unit 11 and the standby line interface unit 12 via the receiving buffers 102 and 103, and controls the active line interface under the control of the line protection control unit 104. A signal from the interface unit 11 is selected and transmitted as a downstream signal.

As described above, in the present embodiment, since the fixed value signal is input to the buffer related to the signal in the downstream direction of the standby line interface unit in the off-line state, Does not perform a switching operation, and therefore no current flows through the buffer.

Next, the operation when a failure occurs in the active transmission line will be described.

When a failure occurs in the working transmission line, the working line interface unit 11 sends a working failure signal to the line protection control unit 104. The line protection control unit 104 sets the active line interface unit 11 to the offline state and sets the standby line interface unit 12 to the online state in response to the active system failure signal. Further, the selection circuit 105 selects the signal received from the standby line interface unit 12 based on the setting of the line protection control unit 104 and outputs the signal as a downstream signal.

Active line interface unit 11
In response to the setting of the offline state by the line protection control unit 104, the fixed value output circuit 113 forcibly converts the signal received from the working transmission line into a fixed value signal, Is transmitted to the selection circuit 105 via the transmission buffer 112 and the reception buffer 102 on the switching unit 10 side.

On the other hand, the standby line interface unit 12 is controlled by the line protection control unit 104.
In response to being set to the online state, the fixed value output circuit 123 cancels the forcible conversion to the fixed value output signal, and the signal received from the standby transmission line is transmitted to the transmission buffer 122 and the switch. The data is directly transmitted to the selection circuit 105 via the reception buffer 103 on the unit 10 side.

As described above, in the present embodiment, after switching the setting between the online state and the offline state, the buffer related to the downstream signal of the active line interface unit in the offline state is fixed. Since the value signal is input,
The buffer does not perform a switching operation, so that no current flows through the buffer.

Therefore, in the 1 + 1 line protection control system of the present embodiment, since the fixed value signal is input to the buffer related to the downstream signal of the unit in the off-line state,
In general, there is no switching operation in the buffer constituted by a COMS device, and no unnecessary current is consumed in the buffer.

[0043]

As described above, according to the present invention, in the 1 + 1 line protection control method, the downstream signal of a unit in an off-line state can be converted into a fixed value signal. Since the buffer does not perform the switching operation, the current consumption of the buffer constituted by the CMOS device is eliminated, and the power consumption can be reduced as a whole.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a 1 + 1 line protection control system according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional 1 + 1 line protection control system.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 switching unit 101 transmission buffer 102 reception buffer 103 reception buffer 104 line protection control unit 105 selection circuit 11 active line interface unit 111 reception buffer 112 transmission buffer 113 fixed value output circuit 12 standby system line interface unit 121 reception buffer 122 transmission buffer 123 Fixed value output circuit

Claims (4)

(57) [Claims] 1. An active line interface unit connected to an active transmission line, a standby line interface unit connected to a standby transmission line, and any one of the active line interface unit and the standby line interface unit In a line protection control method comprising: setting one of them as an offline state and a switching unit for transmitting a signal from the other in a downstream direction, the working line interface unit and the backup line interface unit are respectively Fixed value output means for converting a signal from the working transmission line and the protection transmission line into a fixed value signal having a fixed value and transmitting the fixed value signal in a downstream direction, wherein the working line interface unit and the protection Rye Interface unit, respectively, when it is set to the off-line state, by detecting the state, the fixed value signal from the fixed value output means, line protection control method characterized in that it sent to the downstream direction. 2. The line protection control system according to claim 1, wherein the active line interface unit and the standby line interface unit each transmit a signal in the downstream direction to the switching unit. A fixed value output unit that is in the offline state among the active line interface unit and the standby line interface unit, sends the fixed value signal to the transmission buffer, The transmission buffer sends the fixed value signal to the switching unit. 3. The line protection control method according to claim 2, wherein the switching unit includes two reception buffers for receiving signals from the active line interface unit and the standby line interface unit, respectively. Line protection control, wherein a reception buffer that receives a signal from one of the active line interface unit and the standby line interface unit that is in the offline state receives the fixed value signal. method. 4. The line protection control method according to claim 3, wherein the fixed value signal is a signal capable of reducing power consumption of the transmission buffer and the reception buffer. method.