JP2000022595A - Signal selection system in redundant line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of non-matching signals between the transmission line signals of redundant constitution. SOLUTION: This system is provided with an input IF part for inputting first and second signals C1 and C2 from the respective input lines of the redundant constitution, a first output IF part for selecting a normal signal by itself and outputting it to a first redundant output line for the branching signals C1a and C2a of the first and second input signals, a second output IF part for selecting the normal signal by itself and outputting it to a second redundant output line for the other branching signals C1b and C2b of the first and second input signals and a signal selection control part for detecting the non-matching signal selection in the first and second output IF parts and matching the selection of the respective branching signals in the first and second output IF parts to a signal input system (C1 or C2) without abnormality for the respective branching signals.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal selection method for a redundant line, and more particularly to a signal selection method for a redundant line in a communication system in which communication devices employing a redundant configuration are connected in multiple stages. In recent years, this type of data communication system has adopted a standby switching method with the aim of improving network reliability, operability, and maintainability. Above all, in the intra-station transmission system and the short-distance inter-station transmission system, a non-revertive 1: 1 preliminary switching system is adopted from the viewpoint of easiness of maintenance, control, management and the like.
Under such a protection switching method, it is required that the transmission signals of the working and protection lines are kept the same, and that the communication service can be continued smoothly regardless of the line switching.

[0002]

2. Description of the Related Art FIGS. 12 and 13 are diagrams for explaining the prior art, and show a partial configuration of a data transmission system using a conventional 1: 1 standby switching system. In FIG. 12, transmission devices A to C having the same redundant configuration are connected to each other via transmission lines of system 0 and system 1. The figure is 0
The case where the system is the active system and the 1 system is the standby system is shown,
Focusing on the downstream signal (the same applies to the upstream signal), the main signal input to the interface unit (IFa) of the transmission device A is subjected to signal processing such as clock transfer and signal duplication by a signal processing unit (DUP). The output signal is IFb, I
It is distributed to each selector (SEL) of Fd. IFb, I
Each SEL of Fd selects the output signal of IFa, so that the same signal from IFa is transmitted to each transmission path in section AB.

Similarly, the main signal input to IFa of the transmission apparatus B is subjected to signal processing such as clock transfer and signal duplication by DUP, and the output signal is output to each SEL of IFb and IFd.
Distributed to Here also, each SEL selects the output signal of IFa, so that the same signal from IFa is transmitted to each transmission path in section BC. Hereinafter, the same applies. FIG.
3, focusing on the details of the transmission device B, IFa,
IFc receives the transmission signal in the section AB and outputs the signals C1 and C2.
And the signals C1 and C2 are distributed to IFb and IFd, respectively. IFb includes an SEL for selecting one of the branch signals C1a and C2a, and a selection control unit (SLC) for switching the selection of the SEL.
It checks and monitors the presence or absence of an error for a and C2a, and basically selects the branch signal C1a or C2a having no error. Similarly, IFd is the branch signal C1.
b and C2b, and the SEL
And a selection control unit SLC for switching the selection of
C checks and monitors the presence or absence of an error in the branch signals C1b and C2b by itself, and basically selects the branch signal C1b or C2b having no error.

The signals C1a, C2a, C1b, C2
If there is no error in b, each SLC selects, for example, the side of the signals C1a and C1b according to the default information.
Further, selection of each SLC can be controlled by redundancy switching control from a redundancy control unit (RCBb) described later. With this configuration, if a communication failure occurs on the 0-system downstream transmission line in the section AB, the signal C1 in the transmission device B causes an error, and accordingly, the branch signals C1a and C1b in the IFb and IFd simultaneously cause errors. Thereby, in IFb, the SLC detects an error in the signal C1a, switches the selection of the SEL to the C2a side, and outputs it to the transmission path D1. In IFd, SLC
Detects an error in the signal C1b and selects the SEL in C2b.
, And output to the transmission path D2. In this way, the same signal C without error is applied to the working and protection lines in the section BC.
2a and C2b are transmitted.

On the other hand, an error is also detected in the signal processing unit DUP of IFa, and the fact is notified to the redundancy control unit RCBa. The RCBa notifies the redundancy control unit RCAb of the transmission device A of the occurrence of the failure via the 1-system uplink in the section AB.
Thereafter, the system 1 in the section AB is switched to the working system and the system 0 is switched to the standby system according to a known line switching control procedure between RCBa and RCAb.

[0006] Normally, since both uplink and downlink lines are switched, information on the switching control is transmitted from RCAb to RC.
Aa is also notified, so that RCAa
The selection of each SEL of c is switched to the 1-system side. In this way, in the transmission path in the section AB, the system 1 becomes the working system in both the upstream and downstream directions.
By the way, focusing on the transmission device B, the branch signals C1a and C1b from the IFa are respectively transmitted through different paths (gate elements, wiring cables, connectors, etc.) to the IFb and IF.
For example, even if the branch signal C1a is normal, the branch signal C1b may become an obstacle due to a poor contact on the way. Further, the branch signals C2a, C2a
The same can happen for 2b.

[0007]

However, conventionally, I
Since each SLC of Fb and IFd selects a branch signal of each input by its own judgment, even if a communication failure does not occur in the transmission path in the section AB, if only the branch signal C1a becomes an error, the SEL of IFb Only switches to section BC
Inconsistency occurred in the transmission line signals of Or the branch signal C1
When only b causes an error, only the SEL of IFd is switched, and a mismatch occurs in the transmission path signal in the section BC.

Conventionally, for example, when the selection of the active IFb is switched, the standby IF
In some cases, the selection of d is matched with the selection of the working IFb. However, no processing is performed when the selection of the standby IFd is switched. As a result, section B
A mismatch occurred in the transmission path signal of C. In addition to the above, in practice, for example, one IFb
Or IFd may be hot-swapped.
Since the signal selection of the F section is initialized in a default direction, a selection mismatch with another IF section may occur.

Furthermore, each branch signal in IFb and IFd may cause an error to occur or disappear in a complicated pattern (combination). As described above, in the above-described conventional system, IFb, IFd may be used under various practical situations. There was considerable selection mismatch between IFd. In addition, if such a selection mismatch is left unchecked, there is a disadvantage that continuity of communication cannot be obtained when the transmission device C switches between active and standby.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a signal selection system which does not cause a signal mismatch between transmission line signals having a redundant configuration. .

[0011]

The above-mentioned problem is solved, for example, by referring to FIG.
Is solved. That is, the signal selection method of the redundant line of the present invention (1) is based on the first and second input lines of the redundant configuration.
An input IF unit for inputting second signals C1 and C2,
A first output IF unit that selects a normal signal for each one of the branch signals C1a and C2a of the second input signal and outputs the signal to the first redundant output line D1, and a first and second input signals For the other branch signals C1b and C2b, a second output IF unit that selects a normal signal by itself and outputs it to the second redundant output line D2, and a signal selection mismatch between the first and second output IF units. A signal selection control unit for detecting and matching the selection of each branch signal in the first and second output IF units with the input signal system (C1 or C2) having no abnormality for each branch signal. is there.

According to the first aspect of the present invention, a signal selection mismatch between the first and second output IF sections is detected, and each branch signal (C1a, C2a) in the first and second output IF sections is detected.
With the configuration in which the selection of (C1b, C2b) is matched to the input signal system (C1 or C2) having no abnormality for each branch signal, no signal mismatch occurs between the signals on the redundant output lines.

Preferably, in the present invention (2), in the above-mentioned present invention (1), the signal selection control section determines that the first and second output IF sections have normal branch signals so that the first and second output IF sections are normal. , The selection of each branch signal in the second output IF section is matched with the selection of the working output IF section at that time. If the signal selection mismatch between the first and second output IF units occurs for some reason, the first and second
In some cases, all the branch signals in the output IF section have returned to normal. Even in such a case, according to the present invention (2), the selection of each branch signal in the first and second output IF sections is matched with the selection of the working output IF section at that time, so that the subsequent redundant output line Not only will there be no signal mismatch between the signals, but this selection will be consistent with the current / standby selection of the system.

The signal selection method for a redundant line according to the present invention (3) is characterized in that the first and second signals C and C are input from each of the redundantly configured input lines.
An input IF unit for inputting the first and second input signals and a first signal for selecting a normal signal for each of the one branch signal C1a and C2a of the first and second input signals and outputting the selected signal to the first redundant output line D1.
And a second output IF unit for selecting a normal signal for each of the other branch signals C1b and C2b of the first and second input signals and outputting the signal to the second redundant output line D2,
Detecting that any one of the output IF units is newly mounted, and selecting the branch signal in the output IF unit is performed by using the already installed output IF unit.
And a signal selection control unit adapted to the selection of the unit.

According to the present invention (3), any one of the output IFs
By detecting the newly installed output IF section and matching the selection of the branch signal in the output IF section with the selection of the already mounted output IF section, any one of the output IF sections is extracted during the system operation, and the Even if implemented, there is no signal mismatch between the signals on the redundant output lines. Further, the signal selection method for a redundant line according to the present invention (4) includes an input IF unit for inputting the first and second signals C1 and C2 from each input line of the redundant configuration, and an input IF unit for each of the first and second input signals. A first output IF unit that selects a normal signal for one of the branch signals C1a and C2a and outputs the selected signal to the first redundant output line D1, and the other branch signals C1b and C1b of the first and second input signals, respectively; A second output IF unit that selects a normal signal by itself for C2b and outputs it to the second redundant output line D2, and a branch signal of an input signal system C1, C2 different between the first and second output IF units. When the error of one of the branch signals is recovered from the error state, the first and second
And a signal selection control unit for matching the selection of each branch signal in the output IF unit with the input signal system (C1 or C2) having no abnormality for each branch signal.

If both of the branch signals (for example, C1a and C2b or C2a and C1b) of the input signal systems C1 and C2 that are different between the first and second output IF units are in an error state, the two IFs
The selection in the section must be inconsistent, but when the error in one of the branch signals is recovered, the inconsistency in selection can be resolved. In such a case, according to the present invention (4), the selection of each branch signal in the first and second output IF units is adjusted to the input signal system (C1 or C2) that does not have an abnormality for each branch signal. With the configuration, no signal mismatch occurs between the signals of the subsequent redundant output lines.

In the signal selection method for a redundant line according to the present invention (5), the first and second signals C and
An input IF unit for inputting the first and second input signals and a first signal for selecting a normal signal for each of the one branch signal C1a and C2a of the first and second input signals and outputting the selected signal to the first redundant output line D1.
And a second output IF unit for selecting a normal signal for each of the other branch signals C1b and C2b of the first and second input signals and outputting the signal to the second redundant output line D2,
Different input signal systems C1, C between the first and second output IF units
When the error of all the branch signals is recovered from the error state of both of the two branch signals, the selection of each of the branch signals in the first and second output IF units is matched with the selection of the working output IF unit at that time. And a signal selection control unit.

If both of the first and second output IF sections have different error signals in the input signal systems C1 and C2 branch signals (for example, C1a and C2b or C2a and C1b), both IFs are in error.
The selection in the section must be inconsistent, but when all errors are recovered, the inconsistency in selection can be resolved. In such a case, according to the present invention (5), the selection of each branch signal in the first and second output IF sections is matched with the selection of the working output IF section at that time, so that the subsequent redundant output line In addition, no signal mismatch occurs between these signals, and this selection is a selection that matches the current / protection selection of the system.

The signal selection method for a redundant line according to the present invention (6) is characterized in that the first and second signals C
An input IF unit for inputting the first and second input signals and a first signal for selecting a normal signal for each of the one branch signal C1a and C2a of the first and second input signals and outputting the selected signal to the first redundant output line D1.
And a second output IF unit for selecting a normal signal for each of the other branch signals C1b and C2b of the first and second input signals and outputting the signal to the second redundant output line D2,
When all the branch signals in the first and second output IF sections are normal, the selection of each branch signal in the first and second output IF sections is matched with the selection of the working output IF section at that time, and An input signal system (C1 or C1) other than the above and having no abnormality in the branch signal in the first and second output IF units.
When there is 2), a signal selection control unit is provided for adjusting the selection of each branch signal in the first and second output IF units to the input signal system having no abnormality for each branch signal.

Therefore, even in the initial state, for example, when the system is powered on, a selection that matches the selection of the working / spare of the system is automatically obtained, and there is an error in a part of the branch signal at that time. Also, a selection is made automatically so that no signal mismatch occurs between the signals on the redundant output lines.

[0021]

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Note that the same reference numerals indicate the same or corresponding parts throughout the drawings. FIG. 2 is a diagram illustrating a transmission device according to an embodiment.
In the figure, reference numeral 10 denotes a signal selection processing unit. Other configurations may be the same as those described with reference to FIGS. In the following, signal selection control for downlink signals will be described, but the same applies to signal selection control for uplink signals.

The function of the signal selection processing unit 10 is a CP (not shown).
This is realized together with the function of the redundancy control unit RCBb by software processing composed of U and a memory. Signal selection processing unit 1
0 generates a control signal SC for correcting a mismatch between signal selections at IFb and IFd based on various information obtained from IFb, IFd, RCBb and the like, and outputs the control signal SC to RCBb. The RCBb that has received this performs its own working / standby switching control and also controls to correct the mismatch of signal selection between IFb and IFd.

Here, the various information includes selection signals S1 and S2 in each SLC, an error determination signal for each branch signal in each SLC, or each branch signal C1a and C2.
a, C1b and C2b themselves, IFb and IFd mounting determination signals Z1 and Z2, and transmission line D managed by RCBb
1, D2 current / backup management information, and the like. FIG.
9 is a flowchart of the signal selection process according to the first embodiment, showing a case where the signal selection in both output IF units is adjusted to an input signal system having no abnormality.

For example, this process is input by being periodically called from the RCBb. In step S1, each S
It is determined whether or not there is a selection mismatch (S1 ≠ S2) based on the selection signals S1 and S2 in the LC. In the case of a match, there is no need to correct the selection, and the process exits as it is. If they do not match, it is checked in step S2 whether all the input signals C1a, C2a, C1b, and C2b are abnormal. The determination of the presence or absence of the abnormality may use the determination result of the presence or absence of the error detected by each SLC. Step S3
Then, it is determined whether there is an input signal system C1 or C2 having no abnormality. If there is no selection, the selection cannot be corrected, and the process exits as it is.

If there is any, all selections of each SLC are matched to the input signal system C1 or C2 having no abnormality in step S4. Then, the process exits. Although the above description has been given of the case where the signal selection mismatch is periodically detected, for example, the selection mismatch is detected by hardware, and the RCBb is interrupted by the detection of the mismatch. The apparatus may be configured to execute the processing after S2.

In the first embodiment, the output line D
It should be noted that signal selection matching is performed irrespective of the working / spare of D2. FIG. 4 is an image diagram of the signal selection processing according to the first embodiment. In the drawing, B1 represents a configuration composed of SEL and SLC of IFb, and B2 represents a configuration composed of SEL and SLC of IFd.

In FIG. 4A, the event proceeds from (a) to (c). In (a), all input signals C1
a, C2a, C1b, C2b are normal and B1, B2
Both select input signals C1a and C1b and provide them to output lines D1 and D2, respectively. In (b), if the input signal C1a becomes abnormal now, the operation of SLC causes B1.
Is switched to the input signal C2a side, and a signal selection mismatch occurs with B2. In (c), when the signal selection processing unit 10 in this case detects a selection mismatch, the input signal system C2 having no abnormality (that is, the input signal C2
Adjust the selection of B2 to the side of b).

In FIG. 4B, FIG.
This is the same as (a) of (A). In (b),
Now, when the input signal C1b becomes abnormal, the signal selection of B2 is switched to the input signal C2b side by the action of the SLC, and a mismatch in signal selection occurs with B1. (C)
In this case, upon detecting the selection mismatch, the signal selection processing unit 10 adjusts the selection of B1 to the side of the input signal system C2 (that is, the input signal C2a) having no abnormality.

By the way, in the first embodiment, when the signal selection mismatch between the first and second output IF units occurs for some reason, the first and second output IF units may be used. It is possible that all branch signals have returned to normal. In such a case, although the processing is not shown, it is possible to match the selection of each branch signal in the first and second output IF sections with the selection of the working output IF section at that time. In this way, not only will there be no signal mismatch between the signals of the subsequent redundant output lines, but this matching will be a selection that matches the working / standby selection of the system.

FIG. 5 is a flowchart of a signal selection process according to the second embodiment, showing a signal selection process when one of the output IF units is newly mounted. In the operating transmission device B, IFb or IFd is often hot-swappable. For example, pull out IFd, then IF
d, the SLC of IFd becomes the signal C1b, C2b
Is not abnormal, the signal specified by the default information (for example, the signal C1b) is selected. At this time,
If IFb is selecting signal C2a, a selection mismatch will occur. Therefore, it is necessary to correct the selection mismatch in such a case.

In the figure, for example, a call is made periodically by the RCBb to input this processing. In step S11, it is determined whether IFb or IFd that has not been mounted is newly mounted. If it has not been implemented yet, there is no need to match the selection, and the process exits as it is.
If IFb or IFd is newly mounted, the input signal system (that is, C1 or C2) selected by the already mounted IFd or IFb is checked in step S12. In step S13, the input signal system selected by the newly mounted IFb or IFd is matched with the input signal system selected by the already mounted IFd or IFb, and the process exits.

In the above description, the case where the new implementation of the IF unit is periodically detected is described. For example, the new implementation of the IF unit is detected by hardware, and the RC is detected by the new implementation detection.
An interrupt is generated in Bb.
The apparatus may be configured to execute the subsequent processing. FIG.
FIG. 9 is an image diagram of a signal selection process according to the second embodiment.

In FIG. 6A, in FIG. 6A, B2 is not mounted. In (b), when B2 is now hot-plugged, B2 selects the signal C1b side according to the default information of the SLC. At this time, since the selection in the already mounted B1 is the signal C2a, a mismatch in the signal selection between the B1 and the B1 occurs. In (c), when the signal selection processing unit 10 in this case detects the new mounting of B2, the signal C2 on the same side as the signal C2a selected by the already mounted B1 is detected.
Match the selection of B2 to 2b.

In FIG. 6B, in FIG. 6A, B1 is not mounted. In (b), when B1 is now hot-plugged, B1 selects the signal C1a side according to the default information of the SLC. At this time, since the selection in the already mounted B2 is the signal C2b, a mismatch in signal selection occurs between the signal B2 and the signal C2b. In (c), when the signal selection processing unit 10 in this case detects the new mounting of B1, the signal C on the same side as the signal C2b selected by the already mounted B2 is detected.
Match the selection of B1 to 2a.

FIG. 7 is a flowchart of a signal selection process according to the third embodiment. By the way, IFb, IFd
In some cases, the branch signals of the input signal systems C1 and C2 that are different between the input signals of the above may be abnormal. For example, the signal C1a causes an error in IFb, and the signal C2 in IFd.
b is an error. In such a case, the inconsistent state of signal selection must be tolerated, but when the error is recovered, the inconsistent state of signal selection can be corrected. At this time, there are a case where all errors are recovered and a case where some errors are recovered. The third embodiment shows the signal selection processing when the latter part of the errors is recovered. .

In the figure, for example, a call is made periodically by the RCBb to input this processing. In step S21, it is determined whether or not the error has been partially recovered. If the error is not partially recovered, the process exits to apply another processing method (for example, the method of FIG. 9 described later). In the case of partial error recovery, all input signals C1
The presence or absence of an abnormality is checked for a, C2a, C1b, and C2b. The determination of the presence or absence of the abnormality may use the determination result detected by each SLC. In step S23, it is determined whether or not there is an input signal system (C1 or C2) having no abnormality. If there is no selection, the selection mismatch cannot be corrected, and the process exits as it is.

If there is, in step S24 all selections of each SLC are matched to the input signal system C1 or C2 having no abnormality, and the process exits. Although the above description has been given of the case where it is periodically detected whether or not partial error recovery is performed, for example, the state of partial error recovery is detected by hardware, and an interrupt is generated in RCBb by the detection of the recovery. Thus, the apparatus may be configured to execute the processing after step S22 in FIG.

In the third embodiment, the output line D
It should be noted that selection matching is performed irrespective of the working / spare of 1, D2. FIG. 8 is an image diagram of a signal selection process according to the third embodiment. In (a) of FIG. 8A, B1 selects the signal C2a and B2 selects the signal C1b due to the occurrence of each error of the signals C1a and C2b, and the signal between the B1 and B2. There is a selection mismatch. In (b), when the error of the signal C1a is recovered, for example, this is a state of partial error recovery. In (c), when the signal selection processing unit 10 detects restoration of the signal C1a, the signal selection processing unit 10 places B1 on the side of the input signal system C1 having no abnormality (that is, the input signal C1a).
Adjust the signal selection of.

In (a) of FIG. 8B, signals C2a and C2a
Due to the overlapping of the errors 1b, B1 selects the signal C1a and B2 selects the signal C2b, and a mismatch in signal selection occurs between B1 and B2.
In (b), for example, when the error of the signal C2a is recovered, this is a state of partial error recovery. In (c), when detecting the restoration of the signal C2a, the signal selection processing unit 10 in this case adjusts the signal selection of B1 to the side of the input signal system C2 having no abnormality (that is, the input signal C2a).

FIG. 9 is a flow chart of the signal selection processing according to the fourth embodiment. In the case where the respective branch signals of the input signal systems C1 and C2 different between the input signals IFb and IFd become abnormal, all errors are detected. The signal selection process in the case of recovery is shown. In the figure, for example, a call is made periodically from RCBb to input this processing. In step S31, it is determined whether or not all errors have been recovered. If not all errors have been recovered, this processing is exited in order to apply another processing method (for example, the method shown in FIG. 7).

In the case of all error recovery, step S3
In step 2, it is checked whether all input signals C1a, C2a, C1b, and C2b are abnormal. The determination of the presence or absence of this abnormality is made in each S.
The determination result of the presence or absence of an error detected by the LC may be used. In step S33, it is determined whether or not all input signals are abnormal. If there is any abnormality, this method is not applied, and the process exits as it is.

If there is no abnormality in all the input signals, the input signal system (C1 or C2) selected by the active IF unit is obtained in step S34. In step S35, the input signal system (C1 or C2) selected by the active IF unit.
To the selection of all IF sections, and the process exits. In the above description, the case of periodically detecting whether or not all errors have been recovered has been described. For example, the state of all errors recovery is detected by hardware, and an interrupt is generated in RCBb upon detection of the recovery. The apparatus may be configured to execute the processing after step S34 in FIG.

According to the fourth embodiment, after all the errors have been recovered, the selection of all the IF units is immediately made in accordance with the selection of the active system (that is, the active system recognized in relation to the opposite device). Therefore, the time of the selection mismatch state can be shortened. FIG. 10 is an image diagram of a signal selection process according to the fourth embodiment. In (a) of FIG. 10A, the signals C1a and C1a
Due to the overlapping of the errors 2b, B1 selects the signal C2a, and B2 selects the signal C1b, and a mismatch in signal selection occurs between B1 and B2.
In (b), when all the errors are recovered, this is the state of all error recovery. In (c), when the signal selection processing unit 10 in this case detects the recovery of all errors, the signal selection processing unit 10 matches the selection system of B2 (signal C2b) to the selection system of B1 (signal C2a) which is the current working system.

In (a) of FIG. 10B, the signals C2a, C2a,
Since each error of C1b occurs at the same time, B1
Selects the signal C1a, and B2 selects the signal C2b, and a mismatch in signal selection occurs between B1 and B2. In (b), when all the errors are recovered, this is the state of all error recovery. In (c), when the signal selection processing unit 10 in this case detects that all errors have been recovered, the signal selection processing unit 10 sends B1 to the selection system (signal C2b) of B2 which is the current working system.
(Selection system (signal C2a)).

FIG. 11 is a flowchart of a signal selection process according to the fifth embodiment, and shows a signal selection process suitable for application to, for example, signal selection matching in an initial state when power is supplied to the apparatus. In step S41, all input signals C
The presence / absence of an error is checked for 1a, C2a, C1b, and C2b. In step S42, it is determined whether or not there is no abnormality in all the input signals. If there is no abnormality, in step S43, the input signal system (C1 or C1) selected by the active system output IF unit is selected.
Find 2). In step S44, the signal selection of all output IF units is matched with the input signal system selected by the active system output IF unit.

If it is determined in step S42 that there is no abnormality in all input signals, it is checked in step S45 whether there is an input signal system (C1 or C2) having no abnormality.
If not, the process exits. If there is, in step S46, the selection of all output IF units is adjusted to the input signal system having no abnormality. In the above embodiments, each signal selection control is described separately. However, the apparatus may be configured by combining two or more arbitrary signal selection processes.

Although a plurality of embodiments suitable for the present invention have been described, it is needless to say that various changes can be made in the configuration, control, and combination of these components without departing from the spirit of the present invention. Not even.

[0048]

As described above, according to the present invention, signal mismatch does not occur between transmission signals in a redundant configuration even in various situations, so that the reliability, operability, and serviceability of this type of network are improved. Is a major contributor to the improvement of

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is a diagram illustrating a transmission device according to an embodiment.

FIG. 3 is a flowchart of a signal selection process according to the first embodiment.

FIG. 4 is an image diagram of a signal selection process according to the first embodiment.

FIG. 5 is a flowchart of a signal selection process according to a second embodiment.

FIG. 6 is an image diagram of a signal selection process according to a second embodiment.

FIG. 7 is a flowchart of a signal selection process according to a third embodiment.

FIG. 8 is an image diagram of a signal selection process according to a third embodiment.

FIG. 9 is a flowchart of a signal selection process according to a fourth embodiment.

FIG. 10 is an image diagram of a signal selection process according to a fourth embodiment.

FIG. 11 is a flowchart of a signal selection process according to a fifth embodiment.

FIG. 12 is a diagram (1) illustrating a conventional technique.

FIG. 13 is a diagram (2) illustrating a conventional technique.

[Explanation of symbols]

 Reference Signs List 10 signal selection processing unit DUP signal processing unit IF interface unit RCA to RCC redundancy control unit SEL selector SLC selection control unit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Naomi Sakurai 3-1-1 Hirooka, Kanazawa-shi, Ishikawa Prefecture Inside Fujitsu Hokuriku Communication System Co., Ltd. (72) Yoshinari Akakura 3-1-1 Hirooka, Kanazawa-shi, Ishikawa Prefecture Fujitsu Hokuriku Communication System Co., Ltd. (72) Inventor Chisato Hamaya 3-1-1 Hirooka, Kanazawa-shi, Ishikawa Prefecture Fujitsu Hokuriku Communication System Co., Ltd. (72) Inventor Hiroyuki Ogaki 4-1-1 Kamiodanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture No. 1 Fujitsu Limited F term (reference) 5K021 AA08 CC08 CC11 DD02 DD05 EE00 FF04 FF11 5K042 CA07 CA15 DA06 DA32 EA03 FA01 GA01 JA01 NA03

Claims (6)

[Claims] An input IF unit for inputting first and second signals from each input line of a redundant configuration, and a normal signal is selected by itself for each one of the first and second input signals. The first output to the first redundant output line
And an output IF unit for selecting a normal signal for each of the other branch signals of the first and second input signals and outputting the selected signal to a second redundant output line.
And an output IF unit for detecting a mismatch between signal selections in the first and second output IF units, and selecting each of the branch signals in the first and second output IF units without any abnormality in each of the branch signals. A signal selection control unit adapted to the input signal system of (1). 2. The signal selection control section according to claim 1, wherein said first and second outputs are:
2. The method according to claim 1, wherein the selection of each branch signal in the first and second output IF sections is matched with the selection of the working output IF section at that time when all the branch signals in the F section are normal. 2. A signal selection method for a redundant line according to item 1. 3. An input IF unit for inputting first and second signals from each input line of a redundant configuration, and a normal signal is selected by itself for each one of the first and second input signals. The first output to the first redundant output line
And an output IF unit for selecting a normal signal for each of the other branch signals of the first and second input signals and outputting the selected signal to a second redundant output line.
Output IF section, and detecting that any one of the output IF sections is newly mounted, and selecting the branch signal in the output IF section to the already mounted output IF section.
A signal selection control unit adapted to select a unit. 4. An input IF unit for inputting first and second signals from each input line of a redundant configuration, and selecting a normal signal by itself for each one of the first and second input signals. The first output to the first redundant output line
And an output IF unit for selecting a normal signal for each of the other branch signals of the first and second input signals and outputting the selected signal to a second redundant output line.
When the error of one of the branch signals of the input signal system different from the error state of both of the output IF unit and the first and second output IF units recovers from the error state, the first and second output IF units A signal selection control unit for adjusting the selection of each branch signal in the output IF unit to an input signal system having no abnormality for each branch signal. 5. An input IF unit for inputting first and second signals from each input line of a redundant configuration, and a normal signal selected by itself for each one of the first and second input signals. The first output to the first redundant output line
And an output IF unit for selecting a normal signal for each of the other branch signals of the first and second input signals and outputting the selected signal to a second redundant output line.
The first and second output IF units may be used when all of the branched signals of the input signal systems different between the first and second output IF units recover from the error state. And a signal selection control unit for matching the selection of each branch signal in (1) with the selection of the active system output IF unit at that time. 6. An input IF unit for inputting first and second signals from each input line of a redundant configuration, and selecting a normal signal by itself for each one of the first and second input signals. The first output to the first redundant output line
And an output IF unit for selecting a normal signal for each of the other branch signals of the first and second input signals and outputting the selected signal to a second redundant output line.
When all the branch signals in the first and second output IF sections are normal, the selection of each branch signal in the first and second output IF sections is performed by the current system output IF section at that time. In accordance with the selection, if there is an input signal system other than the above and which has no abnormality with respect to the branch signal in the first and second output IF sections, the selection of each branch signal in the first and second output IF sections is made. A signal selection control unit for adjusting each branch signal to an input signal system having no abnormality.