JPH0736628B2 - Cross connect equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is used for a data transmission cross-connect device.

〔Overview〕

According to the present invention, in the cross-connect device, the input line, the output line, and the cross-connect switch communication path are divided into two or more groups, and when a failure occurs, the connection relationship is updated for each group to increase the circuit scale. Without doing so, the control is easy, and quick line switching can be performed even when a failure occurs.

[Conventional technology]

FIG. 3 is a block diagram of a conventional cross-connect device.

Cross connect is a technology to realize a communication path efficiently, economically and reliably. Regarding this technology,
In September 1988, the journal of the Institute of Electronics, Information and Communication Engineers, Vol.
71 No.9 pp.934-943, "Trends in Digital Cross-Connect Technology" is available.

Conventionally, the cross-connect device has a configuration as shown in FIG. In FIG. 3, 31 is a mapping information control circuit, 32 is a transmission path switching control circuit, 33 is a cross-connect switch communication path, 34 _{1 to} 34 _2N are 2N input lines, and 36 _{1 to} 36 _N are N.
2: 1 selectors, 37 _{1 to} 37 _N are N 2: 1 selectors, 35 ₁
~ 35 _2N is 2N output lines.

Below, the case where the selection of the selectors 36 _{1 to} 36 _N and 37 _{1 to} 37 _N is fixedly assigned will be described. Cross-connect switch The mapping information control circuit 31 manages and controls the connection relationship between the _2N input lines 34 _{1 to} 34 _2N and the output lines 35 _{1 to} 35 _2N input to the communication path 33. By changing 31 connection information, that is, the mapping table, 2N input lines 34 _{1 to} 34 _2N and output line 35 ₁
The connection relations of ~ 35 _N are updated and the communication network is being reconfigured.

This means can also be used for line protection in the event of a transmission line failure. For example, if there are no obstacles, the input line
34 ₁ and the output line 35 _2N are connected, the output line 35 _N as protection line
It is assumed that is prepared. In this state,
If the output line _{352 N} fails for some reason, update the mapping table of the mapping information control circuit 31,
The transmission line can be switched by changing the connection information of the input line 34 ₁ from the output line 35 _2N to the output line 35 _N.

Further, there is a configuration in which a line protection selector is provided outside the cross-connect switch communication path 33 to switch the transmission path. In FIG. 3, selectors 36 _{1 to} 3
6 _N , 37 _{1 to} 37 _N are used for line protection of the input line 34 and the output line 35, and the output of each selector 36 _{1 to} 36 _N , 37 _{1 to} 37 _N is selectively controlled based on the transmission line switching control circuit 32. To be done. For example, selector 36 ₁ has input line 34 ₁ and input line 34 _{N + 1.}
Used for line signal switching. If the selectors 36 _{1 to} 36 _N and the selectors 37 _{1 to} 37 _N are individually controlled by using the transmission line disconnection control circuit 32, it is possible to switch input lines or output lines. In addition, if they are controlled collectively, N input lines or output lines can be grouped into groups (incoming routes A ₃₁ , B ₃₁ and outgoing routes A ₃₂ , B).
₃₂ ) It is possible to switch in group units.

[Problems to be Solved by the Invention]

However, in such a conventional cross-connect device,
For example, when line protection is performed using a cross-connect switch communication path, it is necessary to update all mapping table information of the cross-connect map information control circuit for each protection. The amount of information required for this update increases according to the number of channels accommodated in the cross-connect switch communication path. For example, when the cross-connect switch communication path is formed by a square lattice cross-point switch, the amount of update information increases in proportion to the square of the number of input terminals. Therefore, there is a problem that the time required to transfer the mapping information also increases. Further, since the increase in the switch scale increases the time required to search for the protection free line, there is a problem that it is not possible to switch the line quickly in the event of a failure. Also, when line switching is performed using a secreter separately from the cross-connect switch communication path, the selector and the cross-connect switch communication path are realized by different integrated circuits (ICs), so heat generated in the output buffer is generated. The amount and power consumption were problems.

The present invention solves the above problems, and an object of the present invention is to provide a cross-connect device that can easily perform control and can quickly switch lines without increasing the circuit scale.

[Means for Solving the Problems]

The present invention, a plurality of 2N input lines, cross-connect switch communication path connected to the 2N input lines, 2N output lines connected to the cross-connect switch communication path,
A first mapping information control means for controlling the connection of the communication path of the cross-connect switch based on the mapping information to switch the connection between the 2N input lines and the 2N output lines. In the cross connect device,
The 2N input lines, 2N output lines, and the cross-connect switch communication path are each divided into two or more groups. Within the 2N input lines or the 2N output lines, In addition to the connection switching by the first mapping information control means when a failure occurs, a first transmission path switching control means for performing connection switching control in the cross-connect switch communication path in the group unit is provided. Characterize.

Further, the present invention provides a plurality of 2N input lines, cross-connect switch circuits connected to the 2N input lines, 2N output lines connected to the cross-connect switch circuits, and mapping information based on the mapping information. And in the cross-connect device comprising a second mapping information control means for performing connection control of the cross-connect switch circuit to switch connection between the 2N input lines and the 2N output lines,
The 2N input lines, the 2N output lines, and the cross-connect switch circuit are each divided into two or more groups, and the addresses designating the 2N input lines are hierarchized. The upper address is set to the group address that specifies the group, and the lower address is set to the address in the group that individually specifies the input lines in the group, and the above 2N input lines or the above 2N output lines fail. In this case, there is provided a second transmission path switching control means for performing connection switching control between the input line and the output line in the group unit by designating the group address separately from the connection switching by the first mapping information control means. be able to.

[Action]

Each of the 2N input lines, 2N output lines and the cross-connect switch communication path is divided into two or more groups. The first transmission path switching control means performs control to update the connection relationship for each group when a failure occurs in 2N input lines or 2N output lines.

As described above, the line size can be switched easily without increasing the circuit scale, and can be easily controlled even when a failure occurs.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings. First
FIG. 1 is a block diagram of a cross-connect device according to an embodiment of the present invention. In Figure 1, the cross-connect device includes a plurality of 2N input lines 14 ₁ to 14 _2N, a cross-connect switch speech path 13 connected to the 2N number of input lines 14, connected to the cross connect the speech path 13 2N output lines 15 ₁ to 15
_2N , as a first mapping information control means for performing control to reconfigure the network by updating the connection relationship between 2N input lines 14 and 2N output lines 15 and cross-connect switch communication path 13 And a mapping information control circuit 11.

Here, the feature of the present invention is that 2N input lines 14,
2N output lines 15 and cross-connect switch channel 13
Are each divided into two or more groups. When a failure occurs in the 2N input lines 14 or the 2N output lines 15, the control for updating the connection relation for each group is performed. The transmission line switching control circuit 12 is provided as one transmission line switching control means.

The operation of the cross-connect device having such a configuration will be described. In FIG. 1, output lines 15 ₁ to 15 _N and output line 15
_{N + 1} to 15 _2N form a group of outgoing routes A ₁₂ and B ₁₂ of N units, and in a normal state, that is, in a state without a failure,
Output lines 15 ₁ to 15 _N is assumed to any input lines are connected in accordance with the mapping information of the mapping information control circuit 11. In this state, when some failure in the output path A ₁₂ occurs, it is outputted to Dekataro B ₁₂ output signal to the output path A ₁₂ based on the control signal supplied from the transmission line switching control circuit 12 , N line unit protection is possible.

Further, the input lines 14 ₁ to 14 _N and input lines 14 _{N + 1} to 14 _2N forms a group of Irigata path A _11, B ₁₁ to the N units, there is no normal state, i.e. a fault condition Then, it is assumed that the input lines 14 _{1 to} 14 _N are connected to arbitrary output lines according to the mapping information of the mapping information control circuit 11. In this state, any failure occurs in Irigata path A _11, if the interrupted input from Irigata path A _11, the cross-connect switch speech path 13 based on the control signal supplied from the transmission line switching control circuit It is possible to switch the input line from the incoming route A ₁₁ to the incoming route B ₁₁ .

FIG. 2 is a block diagram of a cross connect device according to another embodiment of the present invention. In FIG. 2, 21 is a mapping information control circuit, 22 is a transmission line switching control circuit, and 23 ₁ to 23 _2N are 2N × 2.
2N basic cells forming the N cross-connect switch circuit, 24 _{1 to} 24 _2N are input lines, 29 is a mapping information register, 26 is a switching information register, 27 is an exclusive OR gate, 28 is a cross-connect switch cell, 25 ₁ ~ 25 _2N
Is an output line. In addition, input lines 23 ₁ to 23 _N and input line 23
_{N + 1} to 23 _2N is a group of incoming routes A ₂₁ and B _{21 in} units of N lines, output lines 25 _{1 to} 25 _N and output lines 25 _{N + 1 to} 25 _2N are outgoing routes A _{22 in} units of N lines, Form a group of B ₂₂ .

The table is a table showing the addresses of the input lines in the case of N = 4 of the cross-connect device of another embodiment of the present invention. In the table, the input line address is composed of 3 bits, the upper 1 bit is the group address, and the lower 2 bits is the individual address in the group. The mapping information from the mapping information control circuit 21 is stored in the mapping information register 29 of each of the basic cells 23 ₁ to 232 _N , and the control information from the transmission path switching control circuit 22 is held in the switching information register 26. The upper 1 bit of the mapping information register 29 and the output of the switching information register 26 become the input of the exclusive OR gate 27, and the cross-connect switch cell 28 receives the input line based on the output and the lower 2 bits of the mapping information register 29.
Select the output signal from 24 _{1 to} 24 ₈ . In the normal state, that is, in the state where there is no failure, the output of the switching information register 26 is “0”, and the output of the mapping information register 29 is directly supplied to the cross-connect switch cell 28 and stored in the mapping information control circuit 21. The input line and the output line are connected according to the mapping table. In the event of a failure, switching from the inbound route A ₂₁ to the inbound route B ₂₁ is achieved by setting the output of the switching information register 26 to "1" and reacting the group address.

[Effects of the Invention] As described above, the present invention has an excellent effect that the control is easy and the line can be quickly switched even when a failure occurs without increasing the circuit scale.

[Brief description of drawings]

FIG. 1 is a block configuration diagram of a cross-connect device according to an embodiment of the present invention. FIG. 2 is a block diagram of a cross-connect device according to another embodiment of the present invention. FIG. 3 is a block diagram of a conventional cross-connect device. 11, 21, 31 ... Mapping information control circuit, 12, 22, 32 ...
... transmission line switching control circuit, 13 and 33 ...... cross connects the speech _{path, 14 1 ~14 2N, 24 1} ~24 2N, 34 1 ~34 2N ...... input _{lines, 15 1 ~15 2N, 25 1} ~25 _2N , 35 _{1 to} 35 _2N ...... Output line, 2
3 ₁ to 23 _2N …… Basic cell, 26 …… Switching information register, 27…
… Exclusive OR gate, 28 …… Cross connect switch cell, 29 …… Mapping information register, A ₁₁ , A
₂₁ , A ₃₁ , B ₁₁ , B ₂₁ , B ₃₁ …… Incoming route, A ₁₂ , A ₂₂ , A ₃₂ , B
₁₂ , B ₂₂ , B ₃₂ …… Departure route.

Claims (2)

[Claims] 1. A plurality of 2N input lines, a cross-connect switch communication path connected to the 2N input lines, 2N output lines connected to the cross-connect switch communication path, and mapping information. Based on the above 2N input lines and the above
In a cross-connect device having a first mapping information control means for switching connection between 2N output lines, the 2N input lines, 2N output lines and the cross-connect switch communication path are Each of them is divided into two or more groups, which is different from the connection switching by the first mapping information control means when a failure occurs in the 2N input lines or the 2N output lines. A cross-connect device comprising a first transmission line switching control means for performing connection switching control in the cross-connect switch communication channel on a group basis. 2. A plurality of 2N input lines, a cross-connect switch circuit connected to the 2N input lines, 2N output lines connected to the cross-connect switch circuit, and mapping information based on the mapping information. In a cross-connect device comprising a second mapping information control means for performing connection control of the cross-connect switch circuit to switch connection between the 2N input lines and the 2N output lines, the 2N The input lines, the 2N output lines, and the cross-connect switch circuit are each divided into two or more groups, and the addresses designating the 2N input lines are hierarchical,
The upper address is set to the group address that specifies the group, and the lower address is set to the in-group address that individually specifies the input lines in the group, and a failure occurs in the 2N input lines or 2N output lines. In this case, the second transmission line switching control means for controlling the connection switching between the input line and the output line in the group unit by designating the group address separately from the connection switching by the first mapping information control means. A cross-connect device characterized in that