JP2003061171A - Cross connection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cross connection system that performs cross connection in the unit of two cross connections or more at the same time, reduces the circuit scale and enhances the service, flexibility of line setting and the accessibility. SOLUTION: The cross connection system is provided with: a first cross connector (spatial switch 1) that sets the paths of transmission frame signals between high-speed transmission lines and between a high-speed transmission line and a low speed transmission line in the unit of first information block; and a second cross connector (time switches 2, 3) that cross-connects the first information block cross-connected to the low speed transmission line by the first cross connector to the low speed transmission line in the unit of a second information block whose capacity is smaller than that of the first information block or in the unit of time slots.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronous optical network (SONET) / synchronous digital hierarchy (SD).
H) The present invention relates to a cross-connect device applied to an optical network such as a transmission system, and more particularly to a cross-connect device for setting a route between a high-speed transmission line side and a low-speed transmission line side (subscriber line side).

[0002]

2. Description of the Related Art In a digital synchronous network using a synchronous optical network (SONET) / synchronous digital hierarchy (SDH) transmission system, a high-speed transmission path side (higher-order path)
It is necessary to perform cross-connection in units of large information blocks on the side, and to perform cross-connection in units of small information blocks on the low-speed transmission path side (low-order path) on the subscriber side.
However, in the cross-connect device (XC) or insertion / demultiplexing / multiplexing device (ADM) for performing such cross-connect, conventionally, one cross-connect device realizes simultaneous cross-connect in units of different information blocks. There was nothing I did.

Japanese Unexamined Patent Publication (Kokai) No. 6-177848 discloses an invention relating to a cross-connect device that can be commonly used by a plurality of different cross-connect units. This conventional technology is
(Tributary unit) 11 signal units (1.5Mbp
s) and an AU (administrative unit) 3 signal unit (49 Mbps) cross connect can be combined in one cross connect device, and a TU11 signal unit cross connect is possible. A switching circuit for eliminating an unnecessary circuit configuration for processing the AU3 signal and a control circuit required for processing the AU3 signal are added to the device.

When processing the TU11 signal, the switching circuit is switched to the non-exclusion side to perform cross-connection in TU11 signal units. When cross-connecting in units of AU3 signals, the switching circuit is switched to the exclusion side to eliminate the unnecessary circuit configuration and operate the device. Also, AC
Three signals are virtually divided into TU11 signal units, and the same AU
By performing a cross-connect operation such that a plurality of virtual TU11 signals divided from three signals are always output in the same direction, cross-connect is realized in AU3 signal units.

[0005]

However, when the above-mentioned conventional technique is applied to a cross-connect device that simultaneously performs cross-connect in units of two or more cross-connects,
The following problems occur.

In the above-mentioned prior art, in order to realize cross-connects with different exchange units, in addition to the time slot conversion function in the minimum cross-connect unit, a time slot conversion function in a larger cross-connect unit is added. The circuit configuration is redundant because it is necessary. Also,
Since it is necessary to additionally provide a circuit configuration for processing the AU signal and a switching circuit for eliminating unnecessary circuits, the circuit configuration is redundant. Therefore, when this conventional device is applied to a cross-connect device that simultaneously performs cross-connection in units of two or more cross-connects, the first conventional device performs cross-connection in units of large information blocks.
2 and the second cross-connect section for cross-connecting in units of small information blocks, and therefore, there is a problem that the circuit scale increases additively.

The present invention has been made in view of the above,
In a cross-connect device that simultaneously performs cross-connect in units of two or more cross-connects, an object is to obtain a cross-connect device that can reduce the circuit scale, improve service, improve line setting flexibility, and improve accessibility. I am trying.

[0008]

In order to achieve the above object, a cross-connect device according to the present invention receives a high-speed transmission frame signal transmitted on a high-speed transmission path, and stores an information area in the received transmission frame, Converting into a first information block unit of a predetermined capacity, cross-connecting the converted first information block to either the low speed transmission path side or the high speed transmission path side in the first information block unit, and the low speed transmission path side A first cross-connect device for cross-connecting the low-speed transmission frame signal received from the first information block unit to the high-speed transmission path side; and a first cross-connect device cross-connected to the low-speed transmission path side by the first cross-connect device. One information block has a second information block unit or a time slot unit having a smaller capacity than the first information block. Characterized in that it comprises a second cross-connect apparatus for performing cross-connection to the low-speed transmission path.

According to the present invention, there is provided a first cross-connect device for performing route setting of a transmission frame signal between a high speed transmission line and a high speed transmission line and between a high speed transmission line and a low speed transmission line in units of a first information block. The first information block cross-connected to the low-speed transmission line side by the first cross-connect device is connected to the low-speed transmission line in units of second information blocks or timeslots each having a smaller capacity than the first information block. And a second cross-connect device for cross-connecting.

In a cross connect device according to the next invention, in the above-mentioned invention, the second cross connect device receives the low-speed transmission frame signal received from the low-speed transmission line in the second information block unit or the time slot unit. It is further characterized by further having a function of performing cross-connect to the first cross-connect device side.

According to the present invention, the second function for cross-connecting the low-speed transmission frame signal received from the low-speed transmission line to the first cross-connect device side in the second information block unit or the time slot unit is provided. I am trying to add it to the cross-connect device.

[0012] A cross-connect device according to the next invention is the above-mentioned invention, wherein the first cross-connect device has a space switch for setting a route for each of the first information blocks, and the second cross-connect device. The connecting device is the second
It is characterized by having a time switch for setting a route for each information block unit or each time slot unit.

According to the present invention, in the first cross-connect device, the route setting is performed in the first information block unit by the space switch, and the second cross-connect device is performed in the second information block unit by the time switch. Alternatively, the route is set for each time slot.

In the cross connect device according to the next invention, in the above invention, the first cross connect device receives a high speed transmission frame signal received from a plurality of first high speed transmission lines in the first information block unit. A plurality of first information block separating means, and the separated first information block is routed to either the low speed transmission line side or the second high speed transmission line side in units of the first information block. A route setting means, a first information block multiplexing means for multiplexing the first information block route-set by the route setting means on the low-speed transmission path side to generate the low-speed transmission frame signal; A plurality of multiplexes for multiplexing the first information block whose route is set on the second high-speed transmission line side by the setting means to generate the high-speed transmission frame signal and transmitting the high-speed transmission frame signal to the second high-speed transmission line. A second information block multiplexing means,
Second information for separating the low-speed transmission frame signal whose route is set to the side of the first cross-connect device by the second cross-connect device into the first information block units and input to the route setting means Block separation means, and the route setting means routes the first information block input from the second information block separation means to the second high-speed transmission line side in units of the first information block. It is characterized by setting.

According to the present invention, in the first cross-connect device, a high-speed transmission frame signal received from a plurality of first high-speed transmission lines by a plurality of first information block separating means is added to the first information block. The first information block is separated into units, and the first information blocks separated by the route setting means are connected to the low-speed transmission path side and the second information block in units of the first information block.
The route is set to one of the high-speed transmission line sides of. The first information block routed to the low speed transmission line side is multiplexed by the first information block multiplexing means to generate a low speed transmission frame signal, and the first information block routed to the high speed transmission line side is generated. Are multiplexed by a plurality of second information block multiplexing means to generate a high speed transmission frame signal. Further, the low-speed transmission frame signal whose route is set to the first cross-connect device side by the second cross-connect device is separated into the first information block unit by the second information block separating means, and then the route setting means is formed. Entered in. The first information block input from the second information block separating means to the route setting means is route-set by the route setting means to the second high-speed transmission line side in units of the first information block.

In the cross connect device according to the next invention, in the above invention, the high-speed transmission frame signal has an STM-N frame structure, and the low-speed transmission frame signal is an STM-n (n <N) frame. The first information block separation means has a structure, and the first information block separating means STs in virtual container units in the payload of the STM-N frame.
The MN frame is separated, the route setting means is a space switch for performing cross-connection in units of virtual containers, and the first information block multiplexing means is provided to the low speed transmission line side by the space switch. The route-set virtual container is multiplexed into the STN-n frame, and the second information block multiplexing means sets the virtual container route-set to the second high-speed transmission line side by the space switch to the STN-n frame. The STM-n is multiplexed in N frames, and the second information block separating means is STM-n routed to the first cross-connect device side by the second cross-connect device.
It is characterized in that the frame is separated into virtual container units in the payload of the STM-n frame.

According to the present invention, the high speed transmission frame signal has an STM-N frame structure, and the low speed transmission frame signal has an STM-n (n <N) frame structure. The first information block separating means is STM-N for each virtual container unit in the payload of the STM-N frame.
The N frames are separated, and the separated virtual container is input to the space switch. The first information block multiplexing means multiplexes the virtual container whose path is set on the low-speed transmission path side by the space switch into the STN-n frame. The second information block multiplexing means multiplexes the virtual container whose route is set on the side of the second high-speed transmission path by the space switch into the STN-N frame. The second information block separating means is an STM whose route is set to the side of the first cross-connect device by the second cross-connect device.
-N frame is separated into virtual container units in the payload of the STM-n frame. The space switch sets the route for each virtual container.

In the cross connect device according to the next invention, in the above invention, the second cross connect device receives an STM-n frame from the first information block multiplexing means of the first cross connect device. Then S
First frame converting means for converting to TM-1 frame, second frame converting means for converting STM-n frame received from the low-speed transmission line into STM-1 frame, and the first or second frame ST from conversion means
A time switch for exchanging the time slot unit in the payload of the M-1 frame, and the STM-1 frame from the first frame converting means exchanged by the time switch is converted into an STM-n frame to convert the low speed. STM from the third frame converting means for sending to the transmission line and the second frame converting means exchanged by the time switch
Fourth frame converting means for converting the -1 frame signal into an STM-n frame signal and inputting it to the second information block multiplexing means of the first cross-connect device.

According to the present invention, in the second cross-connect device, the first frame converting means includes the first information block multiplexing means of the first cross-connecting device and the S
The TM-n frame is received and converted into an STM-1 frame. Further, the second frame converting means converts the STM-n frame received from the low speed transmission line into the STM-1 frame. The time switch exchanges the time slot unit in the payload of the STM-1 frame from the first or second frame converting means. The third frame converting means converts the STM-1 frame from the first frame converting means exchanged by the time switch into an STM-n frame and sends it out to the low speed transmission line. The fourth frame conversion means converts the STM-1 frame signal from the second frame conversion means exchanged by the time switch into an STM-n frame signal to perform the second information block multiplexing of the first cross-connect device. Enter in the means.

In the cross connect device according to the next invention, in the above invention, the second cross connect device receives an STM-n frame from the first information block multiplexing means of the first cross connect device. Then S
First frame converting means for converting to TM-1 frame; second frame converting means for converting a low speed transmission frame signal received from the low speed transmission path into an STM-1 frame; and the first or second frame S from conversion means
A time switch for exchanging a time slot unit in the payload of the TM-1 frame, and an STM-1 frame from the first frame converting means exchanged by the time switch for a low speed transmission frame signal on the low speed transmission line. STM-1 frame signals from the second frame converting means exchanged by the time switch and the third frame converting means for converting to STM-n.
And a fourth frame converting means for converting into a frame signal and inputting to the second information block multiplexing means of the first cross-connect device.

According to the present invention, in the second cross-connect device, the first frame converting means includes the first information block multiplexing means of the first cross-connecting device and the S
The TM-n frame is received and converted into an STM-1 frame. Further, the second frame converting means converts the STM-n frame received from the low speed transmission line into the STM-1 frame. The time switch exchanges the time slot unit in the payload of the STM-1 frame from the first or second frame converting means. The third frame converting means converts the STM-1 frame from the first frame converting means exchanged by the time switch into a low speed transmission frame signal on the low speed transmission path and sends it to the low speed transmission path. Fourth
In the frame converting means, the STM-1 frame signal from the second frame converting means exchanged by the time switch is converted into an STM-n frame signal and is converted into the second information block multiplexing means of the first cross-connect device. input.

In the cross connect device according to the next invention, in the above invention, the first cross connect device separates the SOH of the STM-N frame received from the first high speed transmission line into virtual container units. First SOH separating means for inputting to the space switch, and SOH-separating the SOH in virtual container units from the STM-n frame routed to the first cross connecting device side by the second cross connecting device. Second SOH separation means for inputting to the space switch, and the first SOH separation means.
The SOH input from the SOH separating means is set to the same route side as the corresponding virtual container in the same STM-N frame as the SOH, and the second SOH is set.
The SOH input from the OH separation means is routed to the same STM-n frame as the SOH on the same route side as the corresponding virtual container, and the spatial switch is routed to the low speed transmission route side. SO
ST for H generated by the first information block multiplexing means
First SOH inserting means for inserting into the M-n frame, and SOH routed to the second high-speed transmission path side by the space switch into the STM-N frame created by the second information block multiplexing means. A second SOH inserting means for inserting, wherein the first information block multiplexing means creates an STM-n frame using the SOH inserted by the first SOH inserting means, and the second information The block multiplexing means is characterized by creating the STM-N frame using the SOH inserted by the second SOH inserting means.

According to the present invention, in the first cross-connect device, the SDH frame (S
The section overhead (SOH) included in the TM-N, STM-n frame) is also cross-connected in virtual container units. In the first cross-connect device, the first SOH separating means separates the SOH of the STM-N frame received from the first high-speed transmission line into virtual container units and inputs them to the space switch. Second SO
In the H separation means, the STM-n routed to the first cross-connect device side by the second cross-connect device is set.
The SOH is separated from the frame in units of virtual containers and input to the space switch. In the space switch, the SOH input from the first SOH separation means is used as the SOH.
Is set to the same route side as the corresponding virtual container in the same STM-N frame as
The SOH input from the H separation means is the same S
The route is set on the same route side as the corresponding virtual container in the TM-n frame. In the first SOH insertion means,
The S is routed to the low speed transmission line side by the space switch.
OH is generated by the first information block multiplexing means S
Insert in TM-n frame. The first information block multiplexing means is the SO inserted by the first SOH inserting means.
An STM-n frame is created using H and input to the second cross-connect device. The second SOH insertion means is
The SOH routed to the second high-speed transmission path side by the space switch is inserted into the STM-N frame created by the second information block multiplexing means. The second information block multiplexing means creates an STM-N frame by using the SOH inserted by the second SOH inserting means and sends it to the second high speed transmission line.

In the cross connect apparatus according to the next invention, in the above invention, the second cross connect apparatus is an STM-n input from the first information block multiplexing means to the first frame converting means. The apparatus further comprises first SOH transfer means for separating the SOH from the frame and directly outputting the separated SOH to the third frame converting means, and the third frame converting means includes the first SOH.
The STM-n frame signal is created by using the SOH input from the transfer means.

According to the present invention, in the second cross-connect device, the first SOH transfer means transfers the SOH from the STM-n frame input from the first information block multiplexing means to the first frame converting means. The separated SOH is directly output to the third frame converting means without passing through the time switch. The third frame conversion means is
Using the SOH input from the first SOH transfer means, S
A TM-n frame signal is created and sent to the low speed transmission line.

A cross-connect device according to the next invention is the above-mentioned invention, wherein the second cross-connect device is STM-n input from the first information block multiplexing means to the first frame converting means. First SOH transfer means for separating SOH from the frame and directly inputting the separated SOH to the third frame conversion means, and separation of SOH from the STM-n frame received by the fourth frame conversion means And the separated SOH is added to the fourth
Second SOH transfer means for directly inputting to the frame conversion means of STM, wherein the third and fourth frame conversion means use the SOH input from the first and second SOH transfer means, respectively. It is characterized in that -n frame signals are created.

According to the present invention, in the second cross-connect device, the first SOH transfer means transfers the SOH from the STM-n frame input from the first information block multiplexing means to the first frame converting means. The separated SOH is directly output to the third frame conversion means without passing through the time switch. The third frame conversion means is
Using the SOH input from the first SOH transfer means, S
A TM-n frame signal is created and sent to the low speed transmission line. On the other hand, the second SOH transfer means separates the SOH from the STM-n frame received by the fourth frame conversion means, and directly inputs the separated SOH to the fourth frame conversion means without passing through the time switch. To do. The fourth frame conversion means uses the input SOH to STM-n
A frame signal is created and output to the first cross-connect device side.

[0028]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a cross-connect device according to the present invention will be described in detail below with reference to the accompanying drawings.

First Embodiment A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 conceptually shows a complete line group configuration of a cross-connect device for cross-connecting three routes A, B, and C. FIG. 2 shows a specific configuration of the time switch 2 (or 3) of FIG.

The routes A and B are high-speed transmission lines, and the route C is a low-speed transmission line on the subscriber line side which is inserted (added) / separated (dropped) with respect to the high-speed transmission lines A and B. The route A has n-channel input / output lines, and the route B has m-channel input / output lines. Here, it is assumed that all channels n of the route A and all channels m of the route B are set to the route C on the add / drop side. Therefore, the route C has (m + n) channel input / output lines.

In the space switch 1 having a plurality of optical switch elements arranged in a matrix of n × m, the input line from the route A is routed to the route B or the route C, and the route B is also set. The cross-connect operation is performed by setting the input line from the route A to the route A or the route C, and further setting the input line from the route C to the route A or the route B.

The cross-connect operation in the space switch 1 is performed by the first information block of a predetermined capacity unit which is the same as or smaller than the information area (payload) in the digital transmission frame signal transmitted on the route A or the route B. It is executed in units.

Time switch (TSI: Time Slot Interc)
2) and 3) perform time slot conversion by controlling the reading of the data memory, and the cross-connect operation in the time switches 2 and 3 is smaller than the cross-connect unit in the space switch 1. Second information block unit or time slot unit (1 byte)
Done in.

If the number of input lines of the input / output lines n of the route A is k1 (1 ≦ k1 <n), the k1 channel is input (dropped) to the time switches 2-1 to 2-k1 and the time is changed. The switches 2-1 to 2-k1 perform exchange in units of second information blocks or units of time slots. Route B
K2 (1 ≦ k2 <
m), the k2 channel has time switches 3-1 to 3-3.
-Input (drop) to k2, time switch 3-1 to
At 3-k2, the exchange is performed in the second information block unit or the time slot unit.

Remaining channels (n + m-k1-k2)
Are reserved for insertion (addition) from the route C to the route A or the route B. In FIG. 1, the time switch for adding to the space switch 1 is not shown.

The one time switch 2 and 3 are L × L (L input L output) time switches, k1 is n / L (rounding up after the decimal point), and k2 is m / L.

FIG. 2 shows the internal structure of one time switch 2-1 (or 3-1). The time switch 2-1 outputs from the address memory 6 a plurality of memories 4-1 to 4-L for inputting the input signal of the first information block unit from the space switch 1 through the L channel input port. The counter 7 for generating the output timing signal of the address signal and the write address for writing to the memories 4-1 to 4-L are stored, and the memory 4 is set by the setting of the monitor control interface (not shown).
The address memory 6 stores read address signals for reading from -1 to 4-L. Writing to the memories 4-1 to 4-L is performed in the phase of the input signal.

Here, from the memories 4-1 to 4-L, according to the read address signal output from the address memory 6, the second information block unit or time slot unit smaller than the cross connect unit in the space switch 1 is used. Then, the data is read.

Further, the time switch 2-1 is a selector 5-1 to 5 for selectively selecting a signal output from each of the memories 4-1 to 4-L in parallel in a second information block unit or a time slot unit. -L and each selector 5-1 to 5-L
Generates the output timing signal of the select signal output from the address memory 8 and the selectors 5-1 to 5-L that output the signal output from the second information block unit or the time slot unit to the output port of the L channel. Counter 9 and an address memory 8 for storing select signals input to the selectors 5-1 to 5-L according to the setting of the monitor control interface.

Next, the cross-connect operation from the route A to the route C using the space switch 1 and the time switches 2-1 to 2-k1 will be described.

The high-speed transmission frame signal input from the n-channel route A is routed by the space switch 1, part of which is output to the route C, and the rest is output to the route B. The cross-connect operation in the space switch 1 is executed for each first information block.

The signal of the first information block unit whose route is set to the side of the route C is input to the memories 4-1 to 4-L of the time switches 2-1 to 2-k1. The storage phase is the input phase of the input signal. For reading from the memories 4-1 to 4-L, the read address is stored in the address memory 6 according to the setting from the monitoring control interface, and the read addresses are stored in the memories 4-1 to 4-L according to the timing generated by the counter 7. It is done by outputting to. The read data is output to the selectors 5-1 to 5-L.

The selectors 5-1 to 5-L select and output one of the read data from the memories 4-1 to 4-L. In the address memory 8, the memories 4-1 to 4--4 are set according to the setting from the monitor control interface.
Select signals for instructing each of the selectors 5-1 to 5-L from which part of the read data to be selected in L are stored, and these select signals are selected according to the read timing from the counter 7. It is output to 5-L.

Therefore, the selectors 5-1 to 5-L output the second information block unit or time slot unit signal to the output port of the L channel.

The cross-connect operation from the route B to the route C is similarly performed. Further, the cross-connect operation from the route C to the route A or the route B is similarly performed.
That is, in the space switch 1, the cross-connect operation is performed in the first information block unit, and in the time switch 2, the second information block unit or the time slot unit having a capacity smaller than that of the first information block unit. The cross connect operation is executed.

As described above, in the first embodiment,
A first cross-connect device (spatial switch) for performing route setting of a transmission frame signal between a high-speed transmission line and a high-speed transmission line and between a high-speed transmission line and a low-speed transmission line in units of a first information block; A first information block cross-connected to the low-speed transmission line side by the cross-connect device is cross-connected to the low-speed transmission line in units of second information blocks or timeslots having a smaller capacity than the first information block. Since two cross-connect devices (time switch) are provided, the circuit scale is reduced when cross-connecting in units of two or more cross-connects at the same time, and service improvement, flexibility of line setting and further It is possible to improve accessibility.

Embodiment 2. Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, a case will be described in which the cross-connect device of the present invention is applied to a digital synchronous network based on SDH (Synchronous Digital Hierarchy) defined in ITU-T G.707.

This cross-connect device cross-connects in units of 64 kbps frame (unit of time slot) with the first cross-connect device shown in FIG. 3 which performs cross-connect in units of VC4 (virtual container 4) (155.52 Mbps). The second cross-connect device shown in FIG. 5 for connecting is provided.

The first cross-connect device shown in FIG.
A plurality of STM-16 reception interfaces 10-1 to 10-10 that perform reception termination processing (such as SOP separation) of STM-16 frame signals received from the n-channel high-speed transmission path.
-N and the payload in the STM-16 frame to VC4
Cross-connect operation is performed in VC4 units with a plurality of VC4 separating units 11-1 to 11-n that are separated into units (STM-1 units not including SOP) and are input to 16 input ports of the space switch 12, respectively. The space switch 12 and the space switch 12 that has been routed to the high-speed transmission line side 16
A plurality of VC4 multiplexing units 13 for multiplexing VC4s of channels
-1 to 13-n and STM-16 transmission interfaces 14-1 to 14-n for performing transmission termination processing (insertion of SOP, etc.) of STM-16 frame signals.

Further, the first cross-connect device includes four VC4 multiplexers 15 for multiplexing the VC4s of four channels whose routes are set to the low-speed transmission path side in the space switch 12 into STM-4 frame signals, STM-4 frame signal transmission termination processing is performed to perform 4-channel STM-4
The STM-4 transmission interface 17 for transmitting the frame signal and the 4 received from the second cross-connect device side
An STM-4 receiving interface 18 for performing reception termination processing of the STM-4 frame signal of the channel;
It is provided with four VC4 separating units 16 for separating the payload in the frame into VC4 units.

In order to set a route at the space switch 12 of the first cross-connect device, the CPU 2
1. Virtual container routing table (VC-
RT) 20 and an address generator 19. V
A transmission path for switching a plurality of optical switches in the space switch 12 is set in the C-RT 20. C
The PU 21 refers to the VC-RT 20 and outputs the number of the VC 4 input to the space switch 12 and the route to be designated corresponding to the VC 4 to the address generation unit 19. The address generation unit 19 generates the address of the corresponding VC 4 based on these input information and inputs it to the space switch 12. In the space switch 12, a plurality of optical switches are switched using this input address, so that the high speed transmission line on the reception side of the space switch 12-the high speed transmission line on the transmission side-the second side.
Set the route between these cross-connect devices.

Next, the operation of the first cross-connect device will be described. The STM-16 signal received from another transmission device via the receiving side high-speed transmission line is subjected to STM-16 signal reception termination processing at the STM-16 reception interfaces 10-1 to 10-n. The STM-16 signal subjected to the reception termination processing is the VC4 separation units 11-1 to 11-.
At n, the virtual container 4 (VC4) is separated.

FIG. 4 shows the frame structure of the STM-N signal. The STM-N signal has a relay section overhead RSOH and 5 consisting of 3 rows × 9 × N bytes.
A section overhead SOH having a multiplex section overhead MSOH consisting of rows × 9 × N bytes and a management unit pointer (AU pointer) indicating the start position of a virtual container (VC) consisting of one row × 9 × N bytes, and a payload Has an area. STM
-The payload area of the N signal, that is, the virtual container area, is a 9-row by N-byte path overhead POH.
And has a payload area of 9 rows × 260 × N bytes. One VC4 is multiplexed in the STM-1 frame, and N VC4s are multiplexed in the STM-N frame. Note that the payload area of the STM-N signal, that is, the virtual container area is subjected to byte interleaving that is multiplexed in byte units.

At the VC4 separating units 11-1 to 11-n, VC
The VC 4 separated into four units is input in parallel to the space switch 12. In the space switch 12, the address generator 1
Based on the route setting according to the address input from 9, the cross-connect in VC4 unit is executed. That is, C
The PU 21 refers to the VC-RT 20 and outputs the number of the VC 4 input to the space switch 12 and the route to be designated corresponding to the VC 4 to the address generation unit 19. The address generation unit 19 generates the address of the corresponding VC 4 based on these input information and inputs it to the space switch 12. In the space switch 12, a plurality of optical switches are switched by using the input address to set the high-speed transmission path on the transmission side and the VC4 path to the subscriber side.

The VC4 whose path is set to the transmission side high-speed transmission line in the space switch 12 is the VC4 multiplexing unit 13-1.
13-n. VC4 multiplexer 13-
1 to 13-n multiplex 16 input VC4s and output them. In the multiplexed VC4, the STM-16 transmission interfaces 14-1 to 14-n terminate the transmission of the STM-16 signal and transmit it to the transmission-side high-speed transmission line.

On the other hand, the VC4 routed to the subscriber side in the space switch 12 is input to the VC4 multiplexer 15. The VC4 multiplexer 15 multiplexes four input VC4s to create a payload of an STM-4 frame. The multiplexed VC 4 is added to the STM-4 at the STM-4 transmission interface 17, and the STM-4 is added.
The transmission of the signal is terminated.

On the other hand, the STM-4 signal from the subscriber side is
At the STM-4 receiving interface 18, STM-
Reception termination processing of four signals is performed. VC4 separation unit 16
Separates the payload in the STM-4 frame into VC4 units and inputs the separated VC4 to the space switch 12. Then, the space switch 12 sets the route to the high-speed transmission line on the transmission side.

Next, details of the second cross-connect device shown in FIG. 5 will be described. This second cross-connect device performs cross-connect in the time slot unit of the STM-1 frame signal, that is, in the unit of 64 kbps frame (unit of 1 byte).

This second cross-connect device is a 4-channel ST input from the first cross-connect device side.
The STM-4 reception interface 22 that performs reception termination processing of the M-4 frame signal and the STM-4 signal input from the STM-4 reception interface 22 are 64 kbp.
4 × 4 (4 inputs 4)
Output) time switch 23 and time switch 23 to V
STM-4 transmission interface 2 that executes transmission termination processing of STM-4 signals multiplexed and output in C4 units
4 and STM-received from the subscriber line (low-speed transmission line) side
An STM-4 reception interface 25 that performs a reception termination process of a 4-frame signal, and an STM that performs a transmission termination process of an STM-4 frame signal input from the STM-4 reception interface 25 and outputs it to the first cross-connect device side. -4 transmission interface 26.

FIG. 6 shows the internal structure of the 4 × 4 time switch 23. The time switch 23 separates the VC4 separation units 27-1 to 27-4 for separating the payload of the input STM-4 frame signal into VC4 units and the VC4 input from the VC4 separation units 27-1 to 27-4, respectively. V
Memories 28-1 to 28-4 for storing the input phase of C4
And a counter 32 for generating an output timing signal of an address signal output from the address memory 31, a write address for writing to the memories 28-1 to 28-L, and a monitor control interface (not shown). An address memory 31 is provided which stores a read address signal for reading from the memories 28-1 to 28-4 by setting. Address memory 31
Data is read from the memories 28-1 to 28-4 in a unit of 64 kbps frame (unit of 1 byte) by the read address signal output from the unit. in this case,
Each of the memories 28-1 to 28-4 has a VC4 for three frames.
It has a memory capacity capable of storing data (2,430 bytes × 3).

The time switch 23 is connected to each memory 28.
Selectors 29-1 to 29-4 for selecting one of the signals output in parallel in units of 64 kbps from -1 to 28-4,
The output timing signal of the select signal output from the address memory 33 and the VC4 multiplexers 30-1 to 30-4 that multiplex the signals output from the selectors 29-1 to 29-4 in the unit of 64 kbps frame into the VC4. It has a counter 34 for generating and an address memory 33 for storing select signals for the selectors 29-1 to 29-4 according to the setting of the monitoring control interface.

Next, the operation of the second cross-connect device will be described. The 4-channel STM-4 signal input from the first cross-connect device side is subjected to reception termination processing of the STM-4 frame signal in the STM-4 reception interface 22 and input to the 4 × 4 time switch 23. It In the time switch 23, cross connection is performed in units of 64 kbps.

In the time switch 23, first, the payloads of the STM-4 frame signals input via the input ports of the four channels are converted into VC4 separation units 27-1 and 27-2.
It is separated into VC4 units at 7-4.

In FIG. 7, 64 is performed by the time switch 23.
It is a figure for demonstrating the cross connection of a kbps unit, and the frame structure of the STM-N signal is shown. As described above, the STM-N signal is
Management for indicating the start position of the relay section overhead RSOH consisting of 3 rows × 9 × N bytes and the multiple section overhead MSOH consisting of 5 rows × 9 × N bytes and the virtual container (VC) consisting of 1 row × 9 × N bytes It has a section overhead SOH having a unit pointer (AU pointer) and a payload area. The payload area of the STM-N signal, that is, the virtual container area has a path overhead POH of 9 rows × N bytes and a payload area of 9 rows × 260 × N bytes. In the STM-1 frame,
One VC4 is multiplexed and N is included in the STM-N frame.
VC4s are multiplexed. In the payload area of VC4, that is, STM-1, 4 × 7 × 3 virtual containers 11 (VC11: 1.544 Mbps) are multiplexed. That is, in the time switch 23,
Time slot exchange (1 byte) of the STM-1 signal (virtual container) is performed.

The VC4 separated into VC4 units by the VC4 separation units 27-1 to 27-4 is stored in the memories 28-1 to 28-2.
8-4 is stored. The storage phase is the input phase of VC4. Reading from the memories 28-1 to 28-4
This is performed by storing the read address in the address memory 31 according to the setting from the monitor control interface and outputting the read address to the memories 28-1 to 28-4 according to the timing generated by the counter 32. However, 64k from the memories 28-1 to 28-4
A read address for reading data in bps is stored in the address memory 31. The data read from the memories 28-1 to 28-4 in units of 64 kbps is output to the selectors 29-1 to 29-4.

In the selectors 29-1 to 29-4,
One of the read data from the memories 28-1 to 28-4 is selected and output. The address memory 33 stores the memory 2 depending on the setting from the monitor control interface.
Select signals for instructing each selector 29-1 to 29-4 from which of the read data 8-1 to 28-4 to select are stored. These select signals are read timing from the counter 34. Is output to the selectors 29-1 to 29-4.

FIG. 8 shows the selection logic of the selectors 29-1 to 29-4. Each selector 29-1 to 29
Each select signal input to -4 is 243 so that 2430 bytes of VC4 data can be selected for each byte.
It is set so that 0 identifications can be made.

The read data thus selected is input to the VC4 multiplexers 30-1 to 30-4. V
The C4 multiplexing units 30-1 to 30-4 multiplex the signals output in units of 64 kbps into VC4 and output the signals to the four output ports. The 4-channel VC4 output from the VC4 multiplexing units 30-1 to 30-4 is input to the STM-4 transmission interface 24 in FIG.
The signal transmission termination processing is executed and sent to the low-speed transmission line.

As described above, in the second embodiment,
The first cross-connect device performs cross-connection in VC4 units, and the second cross-connect device 64 k
Cross connection is performed in units of bps.

In the second embodiment, the S input from the subscriber line side to the first cross-connect device is used.
The TM-4 signal is not cross-connected in units of 64 kbps frame, but a time switch similar to the time switch 23 is inserted between the STM-4 reception interface 25 and the STM-4 transmission interface 26 to join. The STM-4 signal input from the private line side to the first cross-connect device may also be cross-connected in units of 64 kbps.

Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIGS. Embodiment 2
Then, in the second cross-connect device, 64 kbp
The 4 × 4 time switch 23 is adopted to perform the cross-connect in s units, but in the third embodiment, the 2 × 2 time switches 36-1 to 36-4 are adopted. In addition, the second cross-connect device is provided with two different input / output interfaces on the low-speed transmission path side (subscriber line side). One is the three-channel optical interfaces 38-1 to 38-3, and in this case, the OC3 interface of SONET 155.52 Mbps is used. The other is a multiplexed bus interface 37. The loopback function is individually supported for each of the optical interfaces 38-1 to 38-3 and the multiplexed bus interface 37. In addition, in the third embodiment, the first cross-connect device has the same configuration as that shown in FIG. 3, and executes cross-connect in VC4 units.

The second cross-connect device of the third embodiment shown in FIG. 9 is an STM that carries out reception termination processing of the STM-4 frame signal input from the first cross-connect device side.
-4 reception interface 35 and 2 × 2 time switches 36-1 to 36-3 cross-connecting in units of 64 kbps
6-4, the multiplex bus interface 37 arranged between the time switches 36-1 to 36-4 and the multiplex bus.
And time switches 36-1 to 36-4 and 3 channel O
OC3 interfaces 38-1 to 38-3 arranged between the C3 optical transmission line and the time switches 36-1 to 36-
STM output from 4 to the first cross-connect device side
-4 frame signal transmission termination processing is performed. The multiplex bus interface 37 is, for example, an interface for mapping a frame format signal other than an SDH frame into a VC4 frame and vice versa. For example, an interface between a VC4 frame and a frame format signal of a multiplexed bus in which an 8-bit payload and an 8-bit supervisory signal are alternately repeated.

In the time switches 36-1 to 36-4, the multiplexed bus frame signals input from the multiplexed bus interface 37 are provided in units of 64 kbps on the first cross-connect device side and the optical interfaces 38-1 to 38-1.
38-3, and the OC3 frame signals input from the optical interfaces 38-1 to 38-3 to the first cross-connect device side or the multiplexing bus interface 37 in units of 64 kbps. A route is set, and the STM-4 frame signal input from the first cross-connect device side is routed to any one of the multiplexed bus interface 37 and the optical interfaces 38-1 to 38-3 in units of 64 kbps. To work.

FIG. 10 shows the internal structure of the 2 × 2 hour switch 36-1 which performs the cross-connect operation as described above. The time switch 36-1 has substantially the same configuration as the configuration shown in FIG.
0, demultiplexing bus interface 41, memory 4
2-1 to 42-2, selectors 43-1 to 43-2,
VC4 multiplexer 44 and demultiplexing bus interface 4
5, an address memory 46, a counter 47, an address memory 48, and a counter 49.

This second cross-connect device operates as follows. STM-4 signal from STM receiving interface 35 or OC3 interface 38 of FIG.
The frame signals from -1 to 38-3 are VC4 of FIG.
It is input to the separation unit 40, and VC is separated in the VC4 separation unit 40.
It is separated into 4 units. The separated VC4 is a memory 42-
Input to 1. On the other hand, the frame signal from the multiplexing bus is input to the demultiplexing bus interface 41, where it is mapped to a predetermined information block (VC4 unit). The information block in units of VC4 is sequentially stored in the memory 42-2.
Entered in.

The memory capacity of each of the memories 42-1 to 42-2 is equivalent to 4 VC frames and 3 frames (2430 bytes × 3). The storage phase is the input phase of VC4 or the pulse phase of the frame signal from the demultiplexing bus. For reading from the memories 42-1 to 42-2, the read address is stored in the address memory 46 according to the setting from the monitoring control interface, and the read addresses are stored in the memories 42-1 to 42-2 according to the timing generated by the counter 47. It is done by outputting to.
However, 64 kbp from the memories 42-1 to 42-2.
A read address for reading data in s units is stored in the address memory 46. The data read from the memories 42-1 to 42-2 in units of 64 kbps are output to the selectors 43-1 to 43-2.

In the selectors 43-1 to 43-2,
One of the read data from the memories 42-1 to 42-2 is selected and output. The address memory 48 contains the memory 4 depending on the setting from the monitor control interface.
Select signals for instructing each of the selectors 43-1 to 43-2 which one of the read data 2-1 to 42-2 is to be selected are stored, and these select signals are read from the counter 49. It is output to the selectors 43-1 to 43-2 according to the timing.

FIG. 11 shows the selection logic of the selectors 43-1 to 43-2. Each selector 43-1 to 4-4
Each select signal input to 3-2 is set to 24 bits so that 2430 bytes of VC4 data can be selected for each byte.
It is set so that 30 items can be identified.

The data thus selected by the selector 43-1 is input to the VC4 multiplexer 44. VC4
The multiplexer 44 multiplexes a signal input in units of 64 kbps into VC4. Then, these multiplexed VC4
The STM-4 transmission interface 39 or O of FIG.
Output to the C3 interfaces 38-1 to 38-3.
The STM-4 transmission interface 39 performs transmission termination processing of the input VC4 and outputs the STM-4 frame signal to the first cross-connect device side. Also, O
The C3 interfaces 38-1 to 38-3 convert the input VC4 into an OC3 frame signal and send it to the optical transmission line.

On the other hand, the data selected by the selector 43-2 is input to the demultiplexing bus interface 45. 64 kb for demultiplexing bus interface 45
A signal input in ps units is multiplexed into a VC4 frame, and the operation of demapping the VC4 frame to a frame format signal for the above-described multiplexed bus other than the SDH frame is executed, and the demapped frame signal is multiplexed. Output to the compliant bus.

As described above, also in the third embodiment,
The first cross-connect device performs cross-connection in VC4 units, and the second cross-connect device 64 k
Cross connection is performed in units of bps. Also, STM
It becomes possible to handle multiplexed buses other than -1 unit and signals on the optical transmission line, which leads to improvement in flexibility of services and line settings and accessibility.

Fourth Embodiment Next, a fourth embodiment of the invention will be described with reference to FIGS. In the fourth embodiment, in the first cross-connect device, the section overhead (SOH) of the STM-N frame signal is also cross-connected.
That is, since the space switch 12 performs cross-connection in VC4 units, the space switch 12 performs ST connection.
The SOH of M-1 unit is the payload of the STM-1, that is, the route is set to the same route side as the corresponding virtual container.

On the other hand, on the second cross-connect device side,
Since the 65 kbps unit cross-connect is performed, the SOP is transferred by bypassing the time switch without passing through the time switch so that the SOH does not receive the 64 kbps unit cross connect even in the time switch.

FIG. 12 shows the configuration of the first cross-connect device according to the fourth embodiment, which corresponds to the first cross-connect device shown in FIG.
SOH separation unit 50 as a component of the cross-connect device of
-1 to 50-n and SOH insertion sections 51-1 to 51-n
The SOH insertion part 52 and the SOH separation part 53 are added.

In FIG. 12, the STM-16 signal received from another transmission device via the receiving side high-speed transmission line is S
The TM-16 reception interfaces 10-1 to 10-n perform reception termination processing of the STM-16 signal, and separate the SOP and the payload. The payload is the VC4 separation unit 11
-1 to 11-n and then to the space switch 12, and the same operation as described above is performed. On the other hand, STM
Sixteen STM-1 frames of SOH separated from the -16 signal are input to SOH separation units 50-1 to 50-n, where they are separated into virtual container units (VC4 units), that is, STM-1 units. Space switch 12
Entered in. Then, the SOH of each STM-1 unit input to the space switch 12 is the SOH as described above.
The payload of TM-1, that is, the corresponding VC4
And the route is set to the same route. Such route setting is performed by the address generator 19, the VC-RT 20 and the CPU.
21 is executed.

In the space switch 12, the SOH route set on the transmission side high-speed transmission line side is the SOH insertion unit 51-
It is input to any of 1 to 51-n. SOH insertion part 51
In -1 to 51-n, the input SOH is STM-16
Sixteen frames corresponding to the frames are multiplexed and input to the STM-16 transmission interfaces 14-1 to 14-n. S
In the TM-16 transmission interfaces 14-1 to 14-n, the input SOH is added to the VC4 multiplexers 13-1 to 13-.
n is combined with the payload of the STM-16 frame input from n to form an STM-16 frame, and the formed S
The TM-16 frame is sent to the high-speed transmission line on the transmission side.

On the other hand, in the space switch 12, SOH routed to the second cross-connect device side is SO
It is input to the H insertion unit 52. The SOH insertion unit 52 multiplexes four input SOHs corresponding to STM-4 frames and inputs the multiplexed SOHs to the STM-4 transmission interface 17. In the STM-4 transmission interface 17, the input SOH is input from the VC4 multiplexing unit 15 to the STM.
-4 frames are combined with the payload to form an STM-4 frame, and the formed STM-4 frame is sent to the second cross-connect device.

Further, from the second cross connect device, S
STM input to TM-4 receiving interface 18
-4 is the STM-4 receiving interface 18
Reception termination processing of the -4 signal is performed, and the SOP and the payload are separated. The payload is input to the VC4 separation unit 16 and then to the space switch 12, and the same operation as described above is performed. On the other hand, SOH for four STM-1 frames separated from the STM-4 signal is stored in the SOH separation unit 5
3 into the virtual container unit (VC4
Units), that is, STM-1 units, and input to the space switch 12. Then, the SOH of each STM-1 unit input to the space switch 12 is routed to the same route as the corresponding VC 4 as described above. Then, these SOH and VC4 are the VC4 multiplexing unit 13-
1-13-n, SOH insertion units 51-1 to 51-n, and STM-16 transmission interface 14-1 to 14-
It is sent to the high-speed transmission line on the transmitting side via n.

Next, the second cross-connect device according to the fourth embodiment will be described with reference to FIGS. 13 and 14.

The second cross-connect device shown in FIG. 13 has a SOH transfer unit 54 added to the components of the second cross-connect device shown in FIG.

That is, in the second cross-connect device for performing the cross-connect in the unit of 64 kbps, the SOH transfer unit 54 is provided so that the SOH does not receive the cross-connect in the unit of 64 kbps.
4 bypasses the time switch 23 so that SOH is directly input from the STM-4 receiving interface 22 to the SDM-4 transmitting interface 24.

The STM-4 reception interface 22 performs reception termination processing of the STM-4 signal and separates it into SOP and payload. Payload is time switch 2
3 and the same operation as described above is performed. On the other hand, S
The SOH for four STM-1 frames separated from the TM-4 signal is input to the STM-4 transmission interface 24 via the SOH transfer unit 54. In the STM-4 transmission interface 24, the payload of the STM-4 signal input from the time switch 23 and the SOH transfer unit 5
The SOH input from 4 is combined to form an STM-4 frame signal, and the formed STM4 frame signal is sent to the subscriber line.

The second cross-connect device shown in FIG. 14 has the SOH transfer section 55 and the SOH transfer section 56 added to the components of the second cross-connect apparatus shown in FIG. The SOH transfer unit 55 includes the STM-4 reception interface 35 and the OC3 interface 38-1.
To 38-3, the SOH transfer unit 56
C3 interfaces 38-1 to 38-3 and STM-4
It is inserted between the transmission interface 39.

That is, also in the second cross-connect device, the SOH transfer units 55 and 5 are arranged so that the SOH does not receive the cross-connect in units of 64 kbps.
6 is provided, and the SOH transfer units 55 and 56 bypass the time switches 36-1 to 36-4 to transfer SOH from the STM-4 reception interface 35 to the OC3 interfaces 38-1 to 38-3 or OC3.
The interfaces 38-1 to 38-3 are directly input to the STM-4 transmission interface 39.

The STM-4 reception interface 35 performs reception termination processing of the STM-4 signal and separates it into SOP and payload. Payload is time switch 3
The data is input to 6-1 to 36-4 and the same operation as described above is performed. On the other hand, STM-1 separated from STM-4 signal
SOH for four frames is input to the OC3 interfaces 38-1 to 38-3 via the SOH transfer unit 55. In the OC3 interfaces 38-1 to 38-3, the payload input from the time switches 36-1 to 36-4 and the SOH input from the SOH transfer unit 55 are combined to form an OC3 frame signal, and the formed signal is formed. OC
The 3-frame signal is sent to the optical transmission line.

On the other hand, the OC3 frame signals input to the OC3 interfaces 38-1 to 38-3 from the optical transmission line are subjected to reception termination processing at the OC3 interfaces 38-1 to 38-3 and separated into SOP and payload. It
The payload is input to the time switches 36-1 to 36-4 and the same operation as described above is performed. On the other hand, the SOH separated from the OC3 signal is sent to the SOH via the SOH transfer unit 56.
It is input to the TM-4 transmission interface 39. ST
In the M-4 transmission interface 39, the time switch 3
Payload input from 6-1 to 36-4 and SOH
The SOH input from the transfer unit 56 is synthesized to synthesize STM-4.
A frame signal is formed and the formed STM-4 frame signal is output to the first cross-connect device.

In this way, various supervisory control information on the high-speed transmission line side and the subscriber line side is transferred in correspondence with the route setting of the space switch 12 of the first cross-connect device.

Although the configuration and operation of the embodiments of the cross-connect device of the present invention have been described above, the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the scope of the claims. Is possible.

In the above embodiment, the unit of the cross-connect performed by the space switch 12 is VC4, but the other VC unit (VC3, VC11, etc.) is used.
May be applied. Also, the cross-connect unit performed by the time switch is not limited to 64 kbps, and if the unit is smaller than the cross-connect unit in the space switch 12, the cross-connect may be performed in an arbitrary capacity unit.

[0100]

As described above, according to the cross-connect device of the present invention, the route setting of the transmission frame signal is first performed between the high speed transmission line and the high speed transmission line and between the high speed transmission line and the low speed transmission line. The first cross-connect device that performs this information block unit and the first information block that is cross-connected to the low-speed transmission line side by the first cross-connect device, and the second information block that has a smaller capacity than the first information block. Since the second cross-connect device for cross-connecting to the low-speed transmission line is provided in the information block unit or the time slot unit, the circuit scale in the case of simultaneously performing cross-connecting in two or more cross-connect units It is possible to improve the service, improve the flexibility of line setting, and improve accessibility.

According to the cross-connect device of the next invention, the second cross-connect device receives the low-speed transmission frame signal received from the low-speed transmission line by the first information block unit or the time slot unit. Since the function to perform cross-connect to the cross-connect device side is further provided, bidirectional route setting is possible in the second cross-connect device, and at the same time, cross-connect can be performed in units of two or more cross-connects. It is possible to reduce the circuit scale when performing the service, improve the service, improve the flexibility of the line setting, and improve the accessibility.

According to the cross-connect device of the next invention, the route setting in a large capacity unit in the first cross-connect device is performed by the space switch suitable for high-speed processing, and the route setting in the second cross-connect device is performed. Since the route is set in small capacity units by the time switch, it is possible to realize an efficient cross-connect operation by making use of the characteristics of both switches.

According to the cross-connect device of the next invention, the first cross-connect device includes a plurality of first information block separating means, a route setting means, a first information block multiplexing means, and a plurality of second information block multiplexing means. Information block multiplexing means and second information block separating means, and the route setting means sets a predetermined first route between the first high speed transmission line, the second high speed transmission line and the low speed transmission line side. Since it is realized in information block units, it is possible to cross-connect arbitrary signals on the low-speed transmission line side and the high-speed transmission line side on the subscriber line side in fixed information block units.

According to the cross-connect device of the next invention, the high-speed transmission frame signal has the STM-N frame structure and the low-speed transmission frame signal has the STM-n (n <n
N) With the frame structure, the first cross-connect device can cross-connect arbitrary signals on the high-speed transmission path side and the low-speed transmission path side in virtual container units such as VC4.

According to the cross-connect device of the next invention, the high-speed transmission frame signal has the STM-N frame structure, and the low-speed transmission frame signal has the STM-n (n <n
N) In the case of having a frame structure, the first cross-connect device can cross-connect arbitrary signals on the high-speed transmission line side and the low-speed transmission line side in units of virtual containers such as VC4, and also in the second cross-connect device. , It becomes possible to perform cross-connection in units of time slots, that is, in units of 64 kbps, which leads to improvement in flexibility of services and line settings and accessibility.

According to the cross-connect device of the next invention, the low-speed transmission frame signal received from the low-speed transmission line is converted into the STM-1 frame, and the STM-1 frame exchanged by the time switch is converted into the low-speed transmission line. Since the frame converting means for converting to the low-speed transmission frame signal is provided, it becomes possible to handle signals of a multiplexing bus other than STM-1 when an external transmission path is used as the low-speed transmission path, etc. , It will improve the flexibility of line setting and accessibility.

According to the cross-connect device of the next invention, in the space switch of the first cross-connect device, the section overhead (SOH) included in the SDH frame (STM-N, STM-n frame) is also a virtual container unit. Since it is designed to be cross-connected to VC4 and SOH of the same STM-1 frame
However, both can be set to the same route.

According to the cross-connect device of the next invention, in the second cross-connect device, the SOH from the first cross-connect device side is received, and the received SOH is transmitted at low speed without passing through the time switch. Since the data is transferred to the frame conversion means on the transmission path side, it is possible to transfer the SOH in STM-1 units without being affected by the 64 kbps cross-connect in the time switch. Therefore, various supervisory control information from the high-speed transmission path side to the low-speed transmission path side is transferred in correspondence with the route setting of the VC4 cross connect.

According to the cross-connect device of the next invention, in the second cross-connect device, the SOH from the first cross-connect device side is received, and the received SOH is transmitted at low speed without passing through the time switch. The SOH is received from the frame converting means on the low-speed transmission path while being transferred to the frame converting means on the transmission path side, and the received SOH is received.
Is transferred to the first cross-connect device side without passing through the time switch.
Without being affected by 4 kbps cross connect
It becomes possible to transfer SOH in STM-1 units. Therefore, various supervisory control information from the high-speed transmission path side to the low-speed transmission path side is transferred in correspondence with the route setting of the VC4 cross connect.

[Brief description of drawings]

FIG. 1 is a block diagram showing a conceptual configuration of a cross-connect device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing an internal configuration of a time switch according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a first cross-connect device of the cross-connect device according to the second embodiment of the present invention.

FIG. 4 is a format diagram showing a frame structure of an SDH frame (STM-N frame).

FIG. 5 is a block diagram showing a configuration of a second cross-connect device of the cross-connect device according to the second embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a 4 × 4 time switch.

FIG. 7 is a format diagram showing a frame structure of an STM-N frame for explaining a payload (VC11 and 64 kbps frame) of an SDH frame (STM-N frame).

FIG. 8 is a diagram showing a selection logic of a 4 × 4 time switch.

FIG. 9 is a block diagram showing a configuration of a second cross-connect device of the cross-connect device according to the third embodiment of the present invention.

FIG. 10 is a block diagram showing the configuration of a 2 × 2 time switch used in the second cross-connect device of the third embodiment.

FIG. 11 is a diagram showing a selection logic of a 2 × 2 time switch.

FIG. 12 is a block diagram showing a configuration of a first cross-connect device of the cross-connect device according to the fourth embodiment of the present invention.

FIG. 13 is a block diagram showing a configuration of a second cross-connect device of the cross-connect device according to the fourth embodiment of the present invention.

FIG. 14 is a block diagram showing another configuration of the second cross-connect device of the cross-connect device according to the fourth embodiment of the present invention.

[Explanation of symbols]

1 space switch, 2 or 3 time switch, 4 memory, 5 selector, 6 address memory, 7 counter,
8 address memory, 9 counter, 10 STM-1
6 reception interface, 11 VC4 separation unit, 12
Space switch, 13 VC4 multiplexer, 14 STM-1
6 transmission interface, 15 VC4 multiplexer, 16
VC4 separation unit, 17 STM-4 transmission interface, 18 STM-4 reception interface, 19 address generation unit, 20 virtual container routing table (VC-RT), 21 CPU, 22 STM-
4 receiving interface, 23 hour switch, 24
STM-4 transmission interface, 25 STM-4 reception interface, 26 STM-4 transmission interface, 27 VC4 separation unit, 28 memory, 29 selector, 30 VC4 multiplexing unit, 31 address memory,
32 counter, 33 address memory, 34 counter, 35 STM-4 receiving interface, 36 time switch, 37 multiplex bus interface, 38
OC3 (optical) interface, 39 STM-4 transmission interface, 40 VC4 demultiplexing unit, 41 demultiplexing bus interface, 42 memory, 43 selector, 44 VC4 multiplexing unit, 45 demultiplexing bus interface, 46 address memory, 47 counter,
48 address memory, 49 counter, 50 SOH
Separation part, 51 SOH insertion part, 52 SOH insertion part, 5
3 SOH separation unit, 54, 55, 56 SOH transfer unit.

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Seiji Kozaki             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. (72) Inventor Hiroshi Ichigase             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. F-term (reference) 5K028 AA07 BB08 KK01 KK03 KK05                       MM05 RR02 TT01                 5K069 AA13 BA02 CB08 DB02 DB11                       DB56

Claims (10)

[Claims] 1. A high-speed transmission frame signal transmitted on a high-speed transmission line is received, and an information area in the received transmission frame is converted into a first information block unit having a predetermined capacity,
The converted first information block is cross-connected to either the low-speed transmission line side or the high-speed transmission line side in units of the first information block, and the low-speed transmission frame signal received from the low-speed transmission line side is transferred to the first information block. A first cross-connect device for cross-connecting to the high-speed transmission line side in units, and a first information block cross-connected to the low-speed transmission line side by the first cross-connect device,
And a second cross-connect device that cross-connects to the low-speed transmission line in units of second information blocks or timeslots having a smaller capacity than the information block. 2. The second cross-connect device cross-connects a low-speed transmission frame signal received from a low-speed transmission path to the first cross-connect device side in the second information block unit or the time slot unit. The cross-connect device according to claim 1, further comprising a function. 3. The first cross-connect device is the first
Of the information block unit, and the second cross-connect device has a time switch for setting the route unit of the second information block unit or the time slot unit. The cross-connect device according to claim 1. 4. The first cross-connect device comprises a plurality of first information block separating means for separating a high-speed transmission frame signal received from a plurality of first high-speed transmission lines into the first information block unit. A route setting means for setting a route of the separated first information block to either the low speed transmission path side or the second high speed transmission path side in units of the first information block; First information block multiplexing means for multiplexing the first information block routed on the transmission path side to generate the low-speed transmission frame signal; and route setting on the second high-speed transmission path side by the route setting means. A plurality of second information block multiplexing means that multiplexes the generated first information blocks to generate the high-speed transmission frame signal and sends the high-speed transmission frame signal to a second high-speed transmission path; and the second cross-connect. Second information block separating means for separating the low-speed transmission frame signal whose path is set to the side of the first cross-connect device by the setting unit into the first information block unit and inputting to the path setting means. The route setting means sets the first information block input from the second information block separating means to the second high-speed transmission path side in units of the first information block. The cross-connect device according to claim 2. 5. The high-speed transmission frame signal is STM-
The low-speed transmission frame signal has an N frame structure,
It has an STM-n (n <N) frame structure, and the first information block separating means has an STM-n unit for each virtual container in the payload of the STM-N frame.
N-frames are separated, the route setting means is a space switch that performs cross-connection in virtual container units, and the first information block multiplexing means sets the route to the low-speed transmission path side by the space switch. The second virtual block is multiplexed with the STN-n frame, and the second information block multiplexing means sets the virtual container routed to the second high-speed transmission line side by the space switch to the STN-N frame. Wherein the second information block separating means routes the STM-n frame routed to the first cross-connect device side by the second cross-connect device to the STM-n frame. The virtual container in the payload of is separated into units. Cross-connect device. 6. The second cross-connect device receives an STM-n frame from the first information block multiplexing means of the first cross-connect device and receives an STM-n frame.
A first frame converting means for converting into one frame; and an STM-n frame received from the low-speed transmission line to ST
Second frame converting means for converting into M-1 frames, and STM-from the first or second frame converting means
A time switch for exchanging time slots in a payload of one frame, and an STM-1 frame from the first frame converting means exchanged by the time switch into an STM-n frame for converting the low speed transmission line. And the STM-1 frame signal from the second frame converting means exchanged by the time switch and the third frame converting means to be transmitted to the STM-n frame signal to convert the STM-1 frame signal to the STM-n frame signal. Second
6. The cross-connect device according to claim 5, further comprising: a fourth frame conversion unit for inputting to the information block multiplexing unit. 7. The second cross-connect device receives an STM-n frame from the first information block multiplexing means of the first cross-connect device and receives an STM-n frame.
A first frame converting means for converting into one frame; and an S low-speed transmission frame signal received from the low-speed transmission path.
Second frame converting means for converting to TM-1 frame, and STM-from the first or second frame converting means
A time switch for exchanging a time slot unit in a payload of one frame, and converting an STM-1 frame from the first frame converting means exchanged by the time switch into a low-speed transmission frame signal on the low-speed transmission path. The STM-1 frame signal from the third frame converting means for transmitting to the low-speed transmission line and the second frame converting means exchanged by the time switch is converted into an STM-n frame signal to convert to the STM-n frame signal. 2nd of 1 cross-connect equipment
6. The cross-connect device according to claim 5, further comprising: a fourth frame conversion unit for inputting to the information block multiplexing unit. 8. The S-1 of the STM-N frame received from the first high-speed transmission line, the first cross-connect device.
First SOH separating means for separating OH in virtual container units and inputting to the space switch, and from an STM-n frame routed to the first cross connecting device side by the second cross connecting device. Second SOH separating means for separating SOH into virtual container units and inputting to the space switch, and SOH input from the first SOH separating means corresponding virtual container in the same STM-N frame as the SOH. The route is set to the same route side as the above, and the SOH input from the second SOH separating means is set to the SO
The first information block multiplexing means includes the space switch that sets a route on the same side as the corresponding virtual container in the same STM-n frame as H, and the SOH that sets a route on the low speed transmission line side by the space switch. First SOH inserting means for inserting into the STM-n frame created in step STM, and STM created by the second information block multiplexing means for SOH routed to the side of the second high speed transmission path by the space switch. A second SOH inserting means for inserting the frame into the N frame; and the first information block multiplexing means,
SOH inserted by the SOH insertion means of
7. The TM-n frame is created, and the second information block multiplexing means creates the STM-N frame by using the SOH inserted by the second SOH inserting means. The cross-connect device described. 9. The second cross-connect device, the STM-n frame to SOH input from the first information block multiplexing means to the first frame converting means,
And further comprising a first SOH transfer means for directly outputting the separated SOH to the third frame conversion means, wherein the third frame conversion means receives the SOH input from the first SOH transfer means. 9. The cross-connect device according to claim 8, wherein the STM-n frame signal is created by using. 10. The second cross-connect device, the STM-n frame to SOH input from the first information block multiplexing means to the first frame conversion means.
First SOH transfer means for directly inputting the separated SOH to the third frame conversion means, and for separating the SOH from the STM-n frame received by the fourth frame conversion means, Second SOH transfer means for directly inputting the separated SOH to the fourth frame conversion means, and the third and fourth frame conversion means respectively include the first and second SOH transfer means. The cross-connect device according to claim 8, wherein an STM-n frame signal is created using the input SOH.