JPH10257580A - Cross connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small sized cross connector with low power consumption even when the cross connector handles communication requiring a large capacity in the cross connector having redundant constitution used for an optical transmission system or the like suitable for long distance transmission of information requiring a high capacity at a high speed. SOLUTION: This cross connector is provide with a current system cross connect means 1 forming a current system and consisting of plural frames of the same internal constitution, a spare system cross connect means 2 that forms a spare system and is constituted of number of frames less than that of the current system cross connect means 1 and a changeover control means 3 that makes in use each frame consisting of the spare system cross connect means 2 in place of the faulty frame respectively, when a fault occurs in at least one frame among the plural frames consisting of the current system cross connect means 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cross-connect device, and more particularly to a cross-connect device having a redundant structure used in an optical transmission system suitable for long-distance transmission of high-speed, large-capacity information.

In recent years, high-speed and large-capacity transmission has been demanded in a trunk system of a communication network, and in a communication system for performing such transmission, a cross-connect device used therein has been increased in scale. Along with this, the cross-connect device tends to be divided into a number of shelves instead of being accommodated in one shelves. On the other hand, in order to enhance reliability, a transmission device generally has a redundant configuration, but a cross-connect device also has a redundant configuration. Under these circumstances, there is a tendency that the cross-connect device occupies a large area and consumes a large amount of power.

[0003]

2. Description of the Related Art FIG. 10 is a block diagram schematically showing a conventional cross-connect device having a redundant configuration. In the figure,
The receiving side IF board 101 and the SW unit 10 as the working system (0 system)
2. There is a transmitting IF board 103, and a receiving IF board 104, a SW unit 105, a transmitting IF board 10 as a standby system (1 system).
There are six. The receiving side IF boards 101 and 104 are
1a, 104a and branching parts (DIS) 101b, 10
4b, the processing units 101a and 104a respectively perform interface processing of signals sent from other devices, and the branch units 101b and 104b branch the processed signals and switch the active and standby SW units. Send to 102 and 105. The SW units 102 and 105 include a selection unit (SEL) 10
2a, 105a, processing units 102b, 105b, branch unit 1
02c and 105c, respectively, and
05a is a receiving IF board 101 for the active and standby systems,
Each of the signals transmitted from the signal 104 is selected, the processing units 102b and 105b perform cross-connect processing, respectively, and the branching units 102c and 105c branch the processed signals to form a working system and a standby system. Transmission side IF board 10
Send to 3,106. Each of the transmission-side IF boards 103 and 106 includes selection units 103a and 106a and processing units 103b and 106b, and each of the selection units 103a and 106a is one of the signals transmitted from the active and standby SW units 102 and 105. Respectively, and processing units 103b and 106b
Performs interface processing and outputs the result to another device. Although not shown, the left side of FIG. 10 is a branching unit for branching a signal sent from another device to the working-side and standby-system receiving-side IF boards 101 and 104, and the right-hand side is a working unit and a standby system. Spare transmission side IF panels 103 and 106
There is a selection unit that selects one of the signals from the other and outputs it to another device.

In such a configuration, if the working system is normal, the receiving IF board 101, the SW unit 102, the transmitting IF
When the board 103 operates, and a failure occurs in any of the receiving IF board 101, the SW unit 102, and the transmitting IF board 103, only the faulty device is switched to the corresponding device on the spare side. .

FIG. 11 is a diagram showing a specific configuration of the conventional cross-connect device shown in FIG. I in FIG.
The F rack 107 includes the receiving-side IF boards 101 and 104 and the transmitting-side IF boards 103 and 106 in FIG. 10, and the SW racks 108 and 109 in FIG. 11 correspond to the active SW unit 102 in FIG. The SW racks 110 and 111 correspond to the standby SW unit 105 in FIG.

That is, the IF rack 107 in FIG. 11 is configured for each channel (1 to n).
The active (0-system) IF unit 107a and the standby system (1
System) IF unit 107b. For example, the working system IF unit 107c and the standby system IF unit 107 for channel n are used.
d. Each IF unit includes a receiving unit and a transmitting unit.

In the SW frames 108 and 109, the cross connect process of the working system is divided into two frames, and the signals of channels 1 to n are input to their input sides, and the output side is the input side. , SW frame 108 are channels 1 to (n
/ 2), and the SW frame 109 outputs the channel (n /
2 + 1) to n are output. Stand-by SW rack 11
The same applies to 0 and 111.

Since the internal structure of each SW frame is the same, the internal structure of the SW frame 108 will be described as a representative. SW frame 10
Reference numeral 8 includes selectors 108a and 108b for each channel and a switch 108c. For example, channel 1
The selecting unit 108a of the channel 1 receives signals (,) from the receiving units of the active and standby IF units 107a and 107b of the channel 1.
), And selects one of them according to an instruction from the monitoring / control rack 112 to be described later and sends it to the switch unit 108c. Further, for example, the selection unit 108b of the channel n receives signals (,) from the receiving units of the active and standby IF units 107c and 107d of the channel n, and selects one according to an instruction from the monitoring / control frame 112. And sends it to the switch unit 108c. The switch unit 108c performs a cross-connect process in accordance with an instruction from the monitoring and control frame 112, and sends, for example, the signal (1) of channel 1 to the transmission units of the working and standby IF units 107a and 107b of channel 1. Also, for example, the signal of channel n / 2 is sent to each transmission unit (not shown in FIG. 11) of the IF unit of the working system and the protection system of channel n / 2.

Similarly, the switch unit of the SW frame 109 converts, for example, a signal of the channel (n / 2 + 1) to each transmitting unit (illustrated in FIG. 11) of the working and standby IF units of the channel (n / 2 + 1). (Omitted). Also, for example, the signal () of channel n is sent to the transmission units of the IF units 107 c and 107 d of the working system and the protection system of channel n. Similarly, in the protection system, the switch unit of the SW frame 110 sends, for example, the signal () of channel 1 to the transmission units of the IF units 107 a and 107 b of the working system and protection system of channel 1. Further, for example, a signal of channel n / 2 is converted to a signal of channel n /
2 is transmitted to each transmitting unit (not shown in FIG. 11) of the active and standby IF units. The switch section of the SW frame 111
For example, the signal of the channel (n / 2 + 1) is
2 + 1) is sent to each transmitting section (not shown in FIG. 11) of the working and standby IF sections. Also, for example, channel n
Of the channel (n) for the active and standby IFs of the channel n
This is sent to each of the transmission units 107c and 107d.

The monitoring and control frame 112 is an active SW frame 10
8, 109 are monitored, and when a failure occurs in any of them, the faulty SW frame is replaced with the corresponding standby system S.
Switch to the W frame. That is, when a failure occurs, the operation of each selector is controlled.

[0011]

However, as shown in FIG. 11, the SW frame is composed of two racks in the working system and the standby system, respectively, so that a total of four racks are provided. If the cross-connect device handles larger-capacity communication, the number of racks in both the active system and the standby system increases. In such a case, the installation area occupied by the cross-connect device increases, and the power consumed by the cross-connect device also increases. There has been a problem that the amount of wiring connecting the frames increases, and of course the cost of the cross-connect device also increases.

The present invention has been made in view of such a point, and an object of the present invention is to provide a small and low power consumption cross-connect device even when the cross-connect device handles large-capacity communication.

[0013]

According to the present invention, in order to achieve the above-mentioned object, as shown in FIG. 1, an active system cross-connect means 1 which forms an active system and comprises a plurality of frames having the same internal configuration. And a standby system, which is the same as the internal configuration of each rack of the active system cross-connect unit 1 and has a smaller number of racks than the active system cross-connect unit 1. When a failure occurs in at least one of the plurality of racks constituting the active cross-connect unit 1, the standby cross-connect unit 2
And a switching control means 3 for using each of the frames constituting in place of the obstacle frame, to provide a cross-connect device.

In the above configuration, when a failure occurs in at least one of the plurality of frames constituting the working cross-connect means 1, the switching control means 3
Each rack constituting the backup cross-connect means 2 is used instead of the obstacle rack. That is, when a failure occurs in one of the plurality of racks constituting the active system cross-connect means 1, one of the plurality of racks constituting the backup cross-connect means 2 is connected to the occurrence of the failure. Use it in place of a rack. If a failure occurs simultaneously in two of the plurality of racks constituting the active cross-connect means 1, two of the plurality of racks constituting the backup cross-connect means 2 are connected to the failures. Use it in place of the rack where the problem occurred.

Each rack of the backup cross-connect means 2 does not correspond one-to-one with each of the plurality of racks constituting the working cross-connect means 1, but is commonly used for any faulty rack. Be able to substitute. In addition, a plurality of racks are prepared in the standby cross-connect unit 2 so as to cope with a case where a plurality of racks of the active cross-connect unit 1 simultaneously fail. However, the number is smaller than the number of the active cross-connect means 1.

Thus, even when the cross-connect device handles large-capacity communication, the number of racks held by the standby cross-connect means 2 can be smaller than in the conventional case, so that the cross-connect device is small and consumes low power. Can be provided.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a cross-connect device according to an embodiment of the present invention will be described with reference to the drawings.

First, the principle configuration of the first embodiment will be described with reference to FIG. In the first embodiment, an active system is formed and a working system cross-connect means 1 composed of a plurality of racks having the same internal configuration, and a standby system is formed and the inside of each rack of the working system cross-connect means 1 is formed. The backup cross-connect means 2 has the same configuration as that of the working cross-connect means 1 and is composed of a smaller number of shelves than the working cross-connect means 1, and at least one of the plurality of shelves making up the active cross-connect means 1 A cross-connect device, characterized in that it comprises switching control means 3 for causing each of the frames constituting the standby cross-connect means 2 to be used in place of the faulty frame when a fault occurs in one of the cross-connects. Provided.

In the above configuration, when a failure occurs in at least one of a plurality of racks constituting the working cross-connect means 1, the switching control means 3
Each rack constituting the backup cross-connect means 2 is used instead of the obstacle rack. That is, when a failure occurs in one of the plurality of racks constituting the active system cross-connect means 1, one of the plurality of racks constituting the backup cross-connect means 2 is connected to the occurrence of the failure. Use it in place of a rack. If a failure occurs simultaneously in two of the plurality of racks constituting the working cross-connect means 1, two of the plurality of racks constituting the backup cross-connect means 2 are replaced with the failures. Use it in place of the rack where the problem occurred.

Each rack of the backup cross-connect means 2 does not correspond one-to-one to a plurality of racks constituting the working cross-connect means 1, but can be substituted for any faulty rack. To do. In addition, a plurality of racks are prepared in the standby cross-connect unit 2 so as to cope with a case where a plurality of racks of the active cross-connect unit 1 simultaneously fail. However, the number is smaller than the number of the active cross-connect means 1.

Thus, even when the cross-connect device handles large-capacity communication, the number of racks held by the backup cross-connect means 2 can be reduced as compared with the conventional one, so that the cross-connect device is small and consumes low power. Can be provided.

Next, the first embodiment will be described in detail. FIG. 2 is a diagram showing a detailed configuration of the first embodiment. In the figure, an IF frame 11 performs interface processing for transmission and reception with other devices, and converts received signals of channels 1 to n into SW frames 12 and 13 of an active system (system 0) and a SW frame 14 of a standby system (system 1) 14. Send to The SW racks 12 and 13 have the same configuration as each other, perform cross-connect processing by half, and return each output signal to the IF rack 11. SW frame 14 is SW frame 1
This is a standby (1 system) SW rack having the same configuration as 2 and 13. The monitoring / control rack 15 is an active SW rack 12, 1
3 is monitored, and when a failure occurs in any of them, the failed SW rack is switched to the standby SW rack 14.

The IF rack 11 is configured for each channel. For example, the working IF unit 11a and the standby I
F section 11b, and for example, a working IF section 11c and a standby IF section 11d for channel n. Each IF unit includes a receiving unit and a transmitting unit, and each transmitting unit includes a selecting unit 11aa, 11ba, 11ca, 1
1 da is included.

In the SW racks 12 and 13, the cross-connect processing of the working system is divided into two racks and performed.
On the input side, the signals of channels 1 to n are both input from the IF rack 11, and on the output side, the SW rack 12 outputs the signals of channels 1 to (n / 2), and the SW rack 13 outputs the channel (n / 2 + 1) to n. SW frame 12,1
3 has the same internal configuration, the representative internal configuration of the SW frame 12 will be described below.

The SW frame 12 includes a selection unit 12 for each channel.
a, 12b and a switch section 12c. For example, the selection unit 12a of the channel 1 receives signals (,) from the receiving units of the active and standby IF units 11a and 11b of the channel 1, and selects one of them according to an instruction from the monitoring and control frame 15. To the switch unit 12c. Further, for example, the selecting unit 12b of the channel n receives signals (,) from the receiving units of the active and standby IF units 11c and 11d of the channel n, and selects one according to an instruction from the monitoring and control frame 15. And sends it to the switch unit 12c. The switch unit 12c performs a cross-connect process in accordance with an instruction from the monitoring and control frame 15, and for example, converts the signal () of channel 1 into the active and standby IF units 11 of channel 1.
The data is sent to the selection units 11aa and 11ba of the transmission units a and 11b. Further, for example, the signal of channel n / 2 is
/ 2 is sent to the selection unit (not shown in FIG. 2) of each transmission unit of the working system and the protection system IF unit.

Similarly, in the case of the SW frame 13, for example, the signal of the channel (n / 2 + 1) is
2 + 1) are sent to the selection units (not shown in FIG. 2) of the transmission units of the working and standby IF units. Further, for example, the signal () of the channel n is sent to the selection units 11ca and 11da of the transmission units of the active and standby IF units 11c and 11d of the channel n.

The standby system SW frame 14 is the active system SW frame 1
2 and 13, the input side of which receives the signals of the working system and the protection system of channels 1 to n from the IF rack 11, and the output side of which includes channels m to (m +
n / 2-1). m is 1 or (n / 2
+1). In the SW frame 14, for example, the selection unit 14 a of the channel 1 selects the active and standby I
A signal (,) is received from each receiving unit of the F units 11a and 11b, and one is selected and sent to the switch unit 14c in accordance with an instruction from the monitoring / control rack 15. Further, for example, the selecting unit 14b of the channel n is provided with the active and standby IF
Signals (,) are received from each of the receiving units 11c and 11d, and one of them is selected and sent to the switch unit 14c according to an instruction from the monitoring / control rack 15.

The switch unit 14c performs a cross-connect process in accordance with an instruction from the monitoring / control rack 15, for example,
The signal (* 1) of the channel m is transmitted to the selectors 11 of the transmitters of the active and standby IF units 11a and 11b of the channel 1.
aa, 11ba and channel (n / 2 +
The information is sent to the selecting unit (not shown in FIG. 2) of each transmitting unit of the active and standby IF units in 1). Also, for example, the signal (* 2) of the channel (m + n / 2-1) is converted into a selection unit (not shown in FIG. 2) of each transmission unit of the active and standby IF units of the channel n / 2. ), And the IF unit 11 of the working system and the standby system of the channel n.
The data is sent to the selection units 11ca and 11da of the transmission units c and 11d.

FIG. 3A is a diagram showing the internal configuration of the switch units 12c to 14c of the SW racks 12 to 14.
(B) is a diagram showing a configuration of a cell format used in the switch units 12c to 14c. In this example, it is assumed that an ATM cell is sent to the cross-connect device, and the cross-connect device performs cross-connect processing on a cell-by-cell basis. The cross-connect device is an output buffer type ATM switch.

That is, the switch unit 16 includes a multiplexing unit (M
UX) 17, a routing bit filter 18, and a buffer 19. Each of the signals of channels 1 to n is input to the multiplexing unit 17, and the multiplexing unit 17 performs time division multiplexing on the signals to convert the signals into n-times speed signals.
8 is output. The routing bit filter 18 (n
/ 2), and routing bit filter data is set in advance from the monitoring / control rack 15 for each. Each of the routing bit filters 18 extracts only a signal of a specific channel from each of the channels 1 to n multiplexed into the multiplexed signal according to the routing bit filter data and sends the extracted signal to a corresponding buffer in the buffer 19. Output. The buffer 19 is composed of (n / 2) buffers and converts an n-fold speed into the original speed.

A signal having the format shown in FIG. 3B is input to the switch section 16. That is, in this format, for example, 1 byte is stored in a 53-byte ATM cell.
One byte of routing bit information is added.
The routing bit information is created as routing information when passing through the switch unit 16 based on the VPI / VCI mounted on the header of the ATM cell. By monitoring the routing bit information, each of the routing bit filters 18 can extract only a signal of a specific channel from each of the channels 1 to n multiplexed into the multiplexed signal.

Returning to FIG. 2, the monitoring / control rack 15 monitors the active SW racks 12 and 13 and when a fault occurs in any of them, the faulty SW rack is replaced with the standby SW rack 14.
To switch to. That is, first, the monitoring / control rack 15 sets each predetermined routing bit filter data in the routing bit filter of the switch unit 12c of the SW rack 12 and the routing bit filter of the switch unit 13c of the SW rack 13. And the working SW
As long as neither the frame 12 nor 13 has a fault,
The monitoring / control rack 15 is connected to the channels 1 to (n /
SW) is added to each selection unit included in the transmission unit of each IF unit for 2).
Each signal (〜 ·) sent from the frame 12 is selected, and each I (I / O) signal for the channels (n / 2 + 1) to n of the IF frame 11 is selected.
Each selection unit included in the transmission unit of the F unit selects each signal (...) Transmitted from the SW frame 13.

Next, for example, when a failure occurs in the SW frame 12, the monitoring and control frame 15 is switched to the standby SW frame 1
4, the same data as the predetermined routing bit filter data set in the routing bit filter of the switch unit 12c of the SW frame 12 is set in the routing bit filter of the switch unit 14c. Further, the monitoring / control rack 15 is connected to the channels 1 to (n / 2) of the IF rack 11.
Each of the selection units included in the transmission unit of each IF unit for
2, not the signal from the SW rack 14 (* 1
* 2). In addition, each signal (·) transmitted from the SW frame 13 is provided to each selection unit included in the transmission unit of each IF unit for the channels (n / 2 + 1) to n of the IF frame 11.
~) As it is.

Thus, when a failure occurs in the SW frame 12, the standby SW frame 14 operates in place of the SW frame 12. Similarly, when a failure occurs in the SW frame 13, the monitoring / control frame 15 is switched to the standby system SW frame 1.
4, the same data as the predetermined routing bit filter data set in the routing bit filter of the switch unit 13c of the SW frame 13 is set in the routing bit filter of the switch unit 14c. Further, the monitoring / control rack 15 is connected to the channel (n / 2 + 1) of the IF rack 11.
To the selection units included in the transmission unit of each IF unit for
Instead of the signal from the frame 13, the signal from the SW frame 14 (*
1 to * 2). The IF frame 11
Each of the selection units included in the transmission unit of each IF unit for channels 1 to (n / 2) of each channel is provided with each signal (
~) Is selected as it is.

As a result, even when a failure occurs in the SW frame 13, the standby SW frame 14 operates in place of the SW frame 13. When the SW frame 12 or the SW frame 13 is restored to the normal state, the original SW frame 14 is
Switching back to the W frame is performed immediately.

The selectors 12a, 12b, 13a, 13b, 14a, 14b for each channel of the SW racks 12-14.
Operates to select a signal from the standby system of the corresponding channel when a failure occurs in the active system for each channel of the IF rack 11.

Next, a second embodiment will be described. The second embodiment is basically the same as the first embodiment, but shows a case where the working SW rack is divided into three or more.

FIG. 4 is a diagram showing the configuration of the second embodiment. In the second embodiment, the IF rack 21 has the same configuration as the IF rack 11 of the first embodiment, but the working SW rack is divided into k pieces of SW racks 22 to 23, All have the same configuration. The spare system SW frame is SW frame 2
4 and has the same configuration as the working type SW racks 22 to 23. The monitoring / control rack 25 monitors the k SW racks 22 to 23 in the active system, and switches the faulty SW rack by the standby SW rack 24 when any of them has a failure. To do.

The structure of the IF frame 21 is the same as that of the first embodiment.
Since the configuration is the same as that of the F frame 11, the description is omitted. In the SW frames 22 to 23, the active system cross-connect processing is divided into k frames, and the signals of the channels 1 to n are input from the IF frame 21 to any of the input sides thereof. From the output side, signals for (n / k) channels are output. For example, the SW frame 22 of # 1 outputs signals of channels 1 to (n / k), and the SW frame 23 of #k outputs signals of channels [n- (n / k-1)] to n. The internal configurations of the SW racks 22 to 23 are basically the same as those of the SW racks 12 and 13 of the first embodiment, and thus description thereof is omitted.

However, the switch unit 2 of the SW rack 22 of # 1
2c performs a cross-connect process in accordance with an instruction from the monitoring / control rack 25, and for example, converts the signal () of channel 1 into the active and standby IF sections 21a and 21 of channel 1.
b to the selection units 21aa and 21ba of each transmission unit. Further, for example, the signal of the channel n / k is sent to a selector (not shown in FIG. 4) of each transmitting unit of the active and standby IF units of the channel n / k.

Similarly, although not shown, the switch unit of the # 2 SW frame performs a cross-connect process in accordance with an instruction from the monitoring / control frame 25, and for example, outputs a signal of the channel (n / k + 1). The signals are sent to the selectors (not shown in FIG. 4) of the transmission units of the working and standby IF units of the channel (n / k + 1). Further, for example, the signal of the channel (2n / k) is sent to the selecting unit (not shown in FIG. 4) of each transmitting unit of the working and standby IF units of the channel (2n / k). The same applies to each of the SW frames # 3 to # (k-1).

The switch section 23c of the SW frame 23 of $ k is
The cross-connect processing is performed in accordance with the instruction from the monitoring / control rack 25, and, for example, the signal of the channel [n- (n / k-1)] is converted to the working system and the standby system of the channel [n- (n / k-1)]. The signal is sent to the selecting unit (not shown in FIG. 4) of each transmitting unit of the IF unit of the system. Further, for example, the signal () of the channel n is converted to the selectors 21ca and 21da of the transmitters of the active and standby IF units 11c and 11d of the channel n.
Send to

The SW frame 24 is a currently used SW frame 22 to 23.
The same internal configuration as that described above is provided. The input side receives working and protection system signals of channels 1 to n from the IF rack 21, and the output side includes channels m to (m + n / k-
The signal of 1) is output. m is 1, (n / k + 1), (2
n / k + 1),... [n (1-1 / k) +1]. The switch unit 24c of the SW rack 24 performs a cross-connect process according to an instruction from the monitoring / control rack 25, and for example, converts the signal (* 1) of the channel m into the active and standby IF units 21a and 21b of the channel 1. The signals are sent to the selection units 21aa and 21ba of each transmission unit, and the channels (n / k + 1), (2n / k + 1),.
/ K) +1] to the selecting sections (not shown in FIG. 4) of the transmitting sections of the working and standby IF sections. Further, for example, the signal (* 2) of the channel (m + n / k-1) is converted into the channels (n / k), (2n / k),.
[N (1-1 / k)] are sent to the selectors (not shown in FIG. 4) of the respective transmission sections of the working and protection IF sections, and the working and protection channels of channel n are respectively sent. Selecting section 21c of each transmitting section of the system IF sections 21c and 21d
a, 21da.

The monitoring / control rack 25 monitors the k SW racks 22 to 23 of the active system, and when a failure occurs in any of them, replaces the faulty SW rack with the standby SW rack 2.
Use 4 to switch. That is, first, the monitoring / control rack 25 sets each predetermined routing bit filter data in the routing bit filter of the switch unit of each SW rack. As long as no failure has occurred in all of the active SW racks 22 to 23, the monitoring / control rack 25
Each selection unit included in the transmission unit of each IF unit for the channels 1 to (n / k) of the F frame 21 is caused to select each signal (〜 ·) sent from the SW frame 22 of # 1. Each selection unit included in the transmission unit of each IF unit for the channels (n / k + 1) to (2n / k) of the IF rack 21 selects each signal transmitted from the not-shown # 2 SW rack. . Thus, ♯
The same processing is performed for each of the SW frames 2 to ♯ (k−1), and finally, the channel [n− (n / k−
1)] Each selection unit included in the transmission unit of each IF unit for -n is made to select each signal (..-) sent from the SW rack 23 of $ k.

Next, for example, when a failure occurs in the SW frame 22 of # 1, the monitoring / control frame 25 sends
The same data as the predetermined routing bit filter data set in the routing bit filter of the switch unit 22c of the SW rack 22 is set in the routing bit filter of the switch unit 24c of the W rack 24. further,
The monitoring / control rack 25 is connected to the channels 1 to (n /
k) in each selection unit included in the transmission unit of each IF unit for
Instead of the signal from the frame 22, the signal from the SW frame 24 (*
1 to * 2). The IF frame 21
Each of the selection units included in the transmission units of the IF units for the channels (n / k + 1) to n of (n) is made to directly select each signal sent from each of the SW frames # 2 to #k.

As a result, when a failure occurs in the SW frame 22, the standby SW frame 24 operates instead of the SW frame 22. When a failure occurs in each of the SW frames # 2 to #k, the standby SW frame 24 operates in the same manner instead of the failed SW frame.

Next, a third embodiment will be described. The third embodiment is basically the same as the first and second embodiments, except that the working SW rack is divided into three or more, and two standby SW racks are provided. Is shown.

FIG. 5 is a diagram showing the configuration of the third embodiment. In the third embodiment, the IF rack 31 has basically the same configuration as the IF rack 11 of the first embodiment, but the selection units 31aa, 31ba, and 31c of each channel.
Signals are input to a and 31da from one of the working SW rack and the standby SW rack. As in the second embodiment, the working type SW racks have k SW racks 32 to 32.
33, all of which have the same configuration. The standby system SW rack is composed of two SW frames 34 and 35, and each has the same configuration as the active system SW frames 32 to 33. The monitoring / control rack 36 is composed of k working SW racks 32 to
33, and when one of them has a fault, the faulty SW frame is switched to the standby SW frame 34 or the SW frame 35. When two of the failures 32 to 33 have occurred at the same time, the failures are switched by the standby SW frame 34 and the SW frame 35.

The k SW racks 32 to 33 are the same in construction and operation as the k SW racks 22 to 23 of the second embodiment, and therefore description thereof is omitted. The SW frame 34 is an S
It has the same internal configuration as the W racks 32 to 33. The input side receives working and protection signals of channels 1 to n from the IF rack 31 on the input side.
The signal of (m + n / k-1) is output. m is 1, (n /
k + 1), (2n / k + 1),... [n (1-1 / k)
+1]. Switch section 34 of SW frame 34
c performs a cross-connect process in accordance with an instruction from the monitoring and control frame 36, and for example, converts the signal (* 1) of the channel m into the IF units 31a and 31 of the active and standby systems of the channel 1.
b to the selection units 31aa and 31ba of each transmission unit, and the channels (n / k + 1), (2n / k + 1),.
[N (1-1 / k) +1] active and standby IFs
The data is sent to a selection unit (not shown in FIG. 5) of each transmission unit. Further, for example, the channel (m + n /
k-1) signal (* 2) to channels (n / k), (2
n / k),... [n (1-1 / k)], and sends them to the selectors (not shown in FIG. 5) of the transmitters of the active and standby IF units. The data is sent to the selectors 31ca and 31da of the transmitters of the IF units 31c and 31d of the active system and the standby system of the channel n.

Similarly, the SW frame 35 is an active type SW frame 3
It has the same internal configuration as that of channels 2 to 33. The input side receives the signals of the working system and the protection system of channels 1 to n from the IF frame 31, and the output side has channels p to (p + n).
/ K-1). p is 1, (n / k +
1), (2n / k + 1),... [N (1-1 / k) +
1], but the number is not the same as m of the SW frame 34 at the same time. The switch unit 35c of the SW frame 35 also performs a cross-connect process in accordance with an instruction from the monitoring / control frame 36, and for example, converts the signal (* 3) of the channel p into the active and standby IF units 31a and 31b of the channel 1. The signals are sent to the selection units 31aa and 31ba of each transmission unit, and channels (n / k + 1), (2n / k + 1),.
−1 / k) +1] to the selecting units (not shown in FIG. 5) of the transmitting units of the working and standby IF units. Further, for example, the signal (* 4) of the channel (p + n / k-1) is converted to the channels (n / k), (2n / k),
.. [n (1-1 / k)] active and standby IFs
The selection section 3 of each of the transmission sections of each of the transmission sections of the IF sections 31c and 31d of the working system and the protection system of the channel n while transmitting to the selection section of each transmission section (not shown in FIG. 5).
Send to 1ca and 31da.

The monitoring / control rack 36 monitors the k SW racks 32 to 33 of the active system, and when any one of them has a fault, the faulty SW rack is replaced by the standby SW rack.
Switch to the frame 34 or the SW frame 35. Further, when two of the k SW racks 32 to 33 of the active system have a fault at the same time, they are switched by the SW racks 34 and 35 of the standby system.
That is, the control operation of the monitoring / control rack 36 during the time when no failure has occurred in all of the active SW racks 32 to 33 and when any one of them has a failure is described in the second embodiment. Is the same as that of the monitoring / control rack 25.

Further, k SW racks 32 to 33 of the current system are used.
Among them, for example, when a failure occurs simultaneously in the SW frame 32 of # 1 and the SW frame of # 2 (not shown), the monitoring and control frame 36 is connected to the SW frame 34 and the SW frame 35 of the standby system. The switch frame 32 of # 1 and the S of # 2 are connected to the respective routing bit filters of the switch units 34c and 35c.
The same data as the predetermined routing bit filter data set in the routing bit filter of each switch unit of the W frame is set. Further, the monitoring / control rack 36 sends signals from the SW rack 34 to the selection units included in the transmission units of the IF units for the channels 1 to (n / k) of the IF rack 31 instead of the signals from the SW rack 32. Signal (* 1- *
Select 2). Also, each selector included in the transmission unit of each IF unit for the channels (n / k + 1) to (2n / k) of the IF rack 31 sends signals from the SW rack 35 instead of signals from the # 2 SW rack. A signal (* 3 to * 4) is selected. The channel of the IF frame 31 (2n / k
Each of the selection units included in the transmission unit of each IF unit for +1) to n is made to directly select each signal transmitted from each of the SW frames # 3 to #k.

Thus, the # 1 SW rack 32 and the # 2
Even if a failure occurs simultaneously in the SW frame of the
The W frame 34 and the SW frame 35 will operate instead. Of course, when a failure occurs simultaneously in the other two SW racks of the active system, the SW rack 34 and the SW rack 35 of the standby system are also used.
Operate similarly in place of those two obstacle SW racks.

In the third embodiment described above, the standby system
Although two frames are provided, three or more frames may be provided. Thereby, for example, it is possible to cope with a case where a failure occurs with a new SW frame during the recovery work.

In the first to third embodiments described above,
Each of the selectors provided on the IF frame and the SW frame may be provided with a phase difference absorption circuit for absorbing a phase difference between each signal of the working system and the protection system. As a result, when the signals of the active system and the standby system are simultaneously input to the selection unit, such as during maintenance of the SW frame or switching back after recovery from a failure, switching or switching back without interruption is performed. realizable. However, at the time of switching due to the occurrence of a failure in the SW frame, the switching of the instantaneous interruption is impossible because the signal of the working system has not reached the selection unit.

Next, a fourth embodiment will be described. 4th
Although the fourth embodiment is basically the same as the second embodiment, the fourth embodiment has a configuration in which an optical coupler is used in the signal branching unit of the second embodiment. .

FIG. 6 is a diagram showing the configuration of the fourth embodiment. In the figure, the same reference numerals are given to the same parts as the configuration of the second embodiment, and the description of these same parts will be omitted.

In the fourth embodiment, an E / O section 37 for converting an output electric signal into an optical signal is provided at the output end of the receiving section of the working IF section 21a for channel 1 in the IF frame 21. Also, an O / E unit 38 for converting an optical signal transmitted from the active SW frame 23 into an electric signal, and a standby SW are provided at the input end of the transmission unit of the active IF unit 21a for channel 1.
O / E for converting an optical signal sent from the rack 24 into an electric signal
A part 39 is provided. Similarly, an E / O unit 40 for converting an output electric signal into an optical signal is provided at the output end of the receiving unit of the standby IF unit 21b for channel 1. Also, the working SW frame 2 is connected to the input end of the transmitting unit of the standby IF unit 21b for channel 1.
O / E unit 4 for converting an optical signal sent from 3 into an electric signal
1 and an O / E unit 42 for converting an optical signal sent from the standby system SW frame 24 into an electric signal. Although only the IF unit for channel 1 is shown in FIG.
Similarly, the E / O unit and the O / O unit
/ E part is provided.

An optical coupler 43 is connected to the E / O unit 37 to split an optical signal, and each of the SW frames 22 to 22 of the working system # 1 to #k.
3 and distributed to the SW rack 24 of the standby system. Similarly, E /
An optical coupler 44 is connected to the O section 40 to split an optical signal.
It is distributed to each of the SW racks 22 to 23 of the working system # 1 to k and the SW rack 24 of the standby system. Although not shown, channel 2
Similarly, an optical coupler is provided in the receiving unit of each IF unit for .about.n.

O / E units 45 to 48 for converting the transmitted optical signals into electric signals are provided on the SW frames 22 to 23 of the active system # 1 to k and the SW frames 24 of the standby system, respectively. The electric signal thus converted is sent to the selectors 22c, 23c and 24c, respectively, as in the second embodiment.

The E / O units 49 and 51 are also provided on the output sides of the working type SW frames 22 to 23 and the standby type SW frame 24.
And optical couplers 50 and 52 are provided.
/ E part 38,39,41,42.

With such a configuration, an electric signal is converted into an optical signal, branched, and then returned to an electric signal. Since the transmission speed of the electric signal handled here is, for example, 2.4 Gbps, if the branching is performed without changing the electric signal, reflection occurs at the branch point to cause waveform deterioration, and the electric power is transmitted between the frames. If a signal is routed through a coaxial cable as it is, a coaxial cable loss occurs, and amplitude deterioration occurs. However, such a problem can be solved by converting the optical signal into an optical signal and transmitting the optical signal between the frames, and branching with an optical coupler.

The method of the fourth embodiment, in which a signal is converted into an optical signal and then branched, may be applied to the third embodiment. That is, when there are only two SW frames in the standby system, as shown in FIG. 7A, the O / E unit 53a and the two O / E units are provided in the selection unit 53 of the transmission unit for each channel of the IF frame. / E sections 53b and 53c are provided.
a is connected to a working SW frame, and the O / E units 53b, 53
Two standby switches are connected to c. If three or more standby SW racks are provided, as shown in FIG. 7B, the selection unit 54 of the transmission unit for each channel of the IF rack includes an O / E unit 54a and three O /
E sections 54b and 54c are provided, a working SW rack is connected to the O / E section 54a, and a standby SW rack is connected to the O / E sections 54b and 54c.

Further, in the fourth embodiment, each selector used for the IF frame and each SW frame may be configured using an optical switch. For example, SW frame 2
To explain this by taking 2 as an example, the O / E units 45 and 46 and the selection unit 22a are configured as shown in FIG. That is, the optical switch 55 is composed of the optical switch 55, the O / E unit 56, and the selection voltage generation unit 57. The optical signal from the working optical coupler 43 (FIG. 6) is sent to the first switch unit 55a of the optical switch 55, The optical signal from the standby optical coupler 44 (FIG. 6) is sent to the second switch unit 55b. The first switch unit 55a and the second switch unit 55b are each configured by a waveguide switch,
The path of the passing optical signal is determined according to the polarity of the voltage applied from the selection voltage generator 57. One of the first switch unit 55a and the second switch unit 55b outputs an optical signal
When output to the / E unit 56, the other is wired so as not to output the optical signal to the O / E unit 56.

Further, the method of the fourth embodiment in which the signal is converted into an optical signal and then branched as shown in FIG.
In the case where the present invention is applied to the third embodiment, the selection unit 53 and the selection unit 54 (FIG. 7) may be configured by optical switches. FIG. 9 illustrates a case where an optical switch is applied to the configuration illustrated in FIG.

In FIG. 9, the optical signal from the working SW frame is converted into an electric signal by the O / E unit 58,
Send to 1. On the other hand, only one of the optical signals from a plurality of SW frames of the standby system is selected via the optical switches 59a and 59b. The optical switch 59
The selection switching by the switches a and 59b is performed when a failure occurs in the working SW frame. In the subsequent restoration at the time of restoration, the selection positions of the optical switches 59a and 59b do not change as they are, and the switching operation is not performed. Absent. In addition, in the switching at the time of maintenance, when switching from the working system to the standby system is performed, the selection and switching of the standby SW rack by the optical switches 59a and 59b is performed in advance. For this reason, instantaneous interruption does not occur due to the switching operation of the optical switches 59a and 59b at the time of switching back after restoration or maintenance. Optical switches 59a, 5
The optical signal selected in 9 b is converted into an electric signal in the O / E unit 60 and sent to the hitless selection unit 61.

In the non-instantaneous interruption selector 61, an electric signal from the working system is input to the phase absorber 61a, and an electric signal from the standby system is input to the phase absorber 61b. Phase absorption unit 61
a and the phase absorption unit 61b are each constituted by a phase absorption buffer, and when the same ATM cell is input from the active system and the standby system at the time of restoration after restoration or maintenance, the phase absorption unit 61a and the phase absorption unit Among the 61b, the one that has received the ATM cell first holds that cell. Then, when the same ATM cell arrives at the other end, the comparing unit 61c detects it and notifies the selecting unit 61d. Upon receiving the notification, the selection unit 61d switches back from the standby system to the active system if the recovery is performed after the recovery, and performs the system switching in the required direction during the maintenance. Thus, instantaneous interruption switching is realized at the time of restoration after maintenance or at the time of maintenance.

[0068]

As described above, according to the present invention, when the working cross-connect means is composed of a plurality of racks having the same structure, the spare cross-connect means is replaced by the internal structure of the working cross-connect means. And the number of bridges is smaller than the number of active cross-connect means. As a result, even when the cross-connect device handles large-capacity communication, the number of racks held by the backup cross-connect means can be reduced as compared with the conventional case, so that a cross-connect device with small size and low power consumption can be provided. Becomes possible.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a detailed configuration of the first embodiment.

FIG. 3A is a diagram illustrating an internal configuration of a switch unit of a SW frame, and FIG. 3B is a diagram illustrating a configuration of a cell format used in the switch unit;

FIG. 4 is a diagram illustrating a configuration of a second embodiment.

FIG. 5 is a diagram illustrating a configuration of a third embodiment.

FIG. 6 is a diagram illustrating a configuration of a fourth embodiment.

FIG. 7 (A) is a diagram applied to a case where there are two standby SW racks, and FIG. 7 (B) is a diagram applied to a case where three or more standby SW racks are provided; .

FIG. 8 is a diagram illustrating a case where each selection unit in the fourth embodiment is configured using an optical switch.

FIG. 9 is a diagram illustrating an example in which the method according to the fourth embodiment, in which a signal is converted into an optical signal and then branched according to the fourth embodiment, is applied to the third embodiment; It is a figure explaining the case where it constituted.

FIG. 10 is a block diagram showing a cross-connect device having a conventional redundant configuration.

FIG. 11 is a diagram showing a specific configuration of a conventional cross-connect device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Working cross-connect means 2 Standby cross-connect means 3 Switching control means

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification symbol FI H04L 11/20 C (72) Inventor Toshifumi Fujimoto 1-2-25 Ichibancho, Aoba-ku, Sendai-shi, Miyagi Fujitsu Tohoku Digital Technology Fujitsu Tohoku Digital Technology Co., Ltd. (72) Inventor Keiichi Kanno 1-2-2, Ichibancho, Aoba-ku, Sendai, Miyagi Prefecture

Claims (9)

[Claims] 1. A transmission device for performing large-capacity communication,
In a cross-connect device having a redundant configuration, an active system is formed, an active-system cross-connect unit configured from a plurality of racks having the same internal configuration, and a standby system is formed, and each rack of the active-system cross-connect unit is formed. A backup cross-connect means having the same internal configuration as the number of the work-related cross-connect means and a number smaller than the number of work-type cross-connect means, and at least one of a plurality of the work parts constituting the working-type cross-connect means; And a switching control unit that causes each of the frames constituting the standby system cross-connect unit to be used instead of the faulty frame when a fault occurs in one of the frames. 2. The active system cross-connect unit and the standby system cross-connect unit each include a routing bit filter, and the switching control unit switches by setting filter data of each of the routing bit filters. The cross-connect device according to claim 1, wherein: 3. The signal transmitted from the first device is branched,
A branching means for sending out to the working cross-connect means and the protection cross-connection means; and a second means for selecting one of the outputs sent from the working cross-connection means and the protection cross-connection means, and
Selecting transmitting means for transmitting to the device, wherein the selecting transmitting means, the working cross-connect means and the standby cross-connect means switch one of the plurality of input signals to the switching state. 2. The cross-connect device according to claim 1, further comprising selection means for selecting according to an instruction of the control means. 4. The cross-connect device according to claim 3, wherein each of said selecting means includes a phase difference absorbing means for absorbing a phase difference between a plurality of input signals. 5. The branching unit includes: an electrical / optical conversion unit configured to convert an electric signal sent from the first device into an optical signal; and an optical signal output from the electrical / optical conversion unit. An optical coupler for transmitting to the working cross-connect means and the protection cross-connection means, wherein the working cross-connection means and the protection cross-connect means electrically connect the optical signal sent from the optical coupler. 4. The cross-connect device according to claim 3, wherein optical / electrical conversion means for converting into a signal is provided at a stage preceding the selection means. 6. The working-use cross-connect means and the protection-use cross-connect means include: an electrical / optical conversion means for converting an output electrical signal into an optical signal; and a branching optical signal output from the electrical / optical conversion means. And an optical coupler for transmitting to the selective transmitting means, wherein the selective transmitting means comprises an optical / electrical converting means for converting an optical signal sent from the optical coupler into an electric signal, 4. The cross-connect device according to claim 3, wherein the cross-connect device is provided in each of the preceding stages. 7. An electric / optical conversion means for converting an electric signal sent from the first device into an optical signal, and a branching means for splitting an optical signal output from the electric / optical conversion means. An optical coupler for transmitting to the working system cross-connect means and the protection system cross-connection means, wherein the working-system cross-connection means and the protection-system cross-connection means convert an optical signal into an electric signal. With the respective conversion means, each selection means of the working cross-connect means and the protection cross-connect means is constituted by an optical switch, the optical signal sent from the optical coupler, after passing through the optical switch, the light/
4. The cross-connect device according to claim 3, wherein the cross-connect is input to an electric conversion unit. 8. The working-use cross-connect means and the protection-use cross-connect means include: an electrical / optical conversion means for converting an output electrical signal into an optical signal; and a branching optical signal output from the electrical / optical conversion means. And an optical coupler for transmitting to the selective transmitting unit, wherein the selective transmitting unit converts the optical signal into an electric signal.
An electric conversion unit, wherein the selection unit of the selection transmission unit includes an optical switch, and an optical signal sent from the optical coupler is input to the optical / electric conversion unit after passing through the optical switch. The cross-connect device according to claim 3, wherein: 9. The working-use cross-connect means and the protection-use cross-connect means include: an electrical / optical conversion means for converting an output electrical signal into an optical signal; and a branching optical signal output from the electrical / optical conversion means. And an optical coupler for transmitting to the selective transmitting means, wherein the selective transmitting means converts the optical signal sent from the optical coupler of the working cross-connect means into an electric signal. Converting means; an optical switch for selecting one of the optical signals sent from each optical coupler of the standby cross-connect means; and a standby system for converting the optical signal sent from the optical switch to an electric signal. Optical / electrical converting means; absorbing a phase difference between respective electric signals sent from the working optical / electrical converting means and the standby optical / electrical converting means; Cross-connect device according to claim 3, characterized in that it comprises a phase difference absorbing unit, the for.