JP2006148979A - Multiplexer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To configure a multiplexer to be upgraded so as to be adaptive to transmission system scheme modification. <P>SOLUTION: For example, an LTE with an active/reserve high-speed transmission line of 1:1 configuration comprises: two sets of 10G interfaces 10 in charge of interfacing with a high-speed transmission line: and a unit such as SELH 30 which selects a high-speed transmission line to perform thereon multiplex conversion with a low-speed transmission line. When upgrading the LTE into a 2Fiber BLSR enabled ADM, the unit SELH is switched into SWH that exchanges signals of time slots between the high-speed transmission line and the low-speed transmission line. Signal interfacing of the SELH with the outside of the SWH is made common and delay times are matched between signal inputs and outputs, thereby upgrading based on the unit exchange under operation is realized. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a fixed multiplex conversion device that multiplexes and separates digital signals between a plurality of low-speed transmission lines and high-speed transmission lines in a digital communication network, and a cross-connect function such as ADM (Add Drop Multiplexer), for example. The present invention relates to a multiple conversion apparatus such as a line editing apparatus equipped with

Japanese Patent Application No. 8-170309

As a transmission system using a multiplex conversion device that performs multiplex conversion between a plurality of low-speed transmission lines and a high-speed transmission line, as shown in FIG. 13a, low-speed signals received from the plurality of low-speed transmission lines are time-division multiplexed and high-speed transmission is performed. Point-to-point fixed multiplex conversion equipment (hereinafter referred to as symbol LTE) that transmits as high-speed signals to the path, demultiplexes the high-speed signals received from the high-speed transmission paths into multiple low-speed signals, and transmits them to each low-speed transmission path The connected system is known. In addition, as a configuration for performing self-healing in such a transmission system using LTE, a pair of high-speed transmission lines in a working system for transmitting signals in opposite directions between LTE at both ends; A 1: 1 configuration that provides a pair of standby high-speed transmission lines that transmit signals in opposite directions, and a pair of working systems that transmit signals in opposite directions between LTE at both ends. There is a 1: n configuration in which a plurality of high-speed transmission lines are provided, and a pair of high-speed transmission lines in a spare system that transmits signals in opposite directions are shared by the plurality of high-speed transmission lines. Are known.

In this specification, the active system is represented by W; Working, the standby system is represented by P; Protection, and a multiplex conversion apparatus connected between two other multiplex conversion apparatuses is connected to two other connected systems. One of the multiple conversion devices is represented by E; East, and the other multiple conversion device is represented by W; West.

In the LTE of 1: 1, 1: n configuration, when a failure occurs in the active high-speed transmission line, the high-speed transmission line used for signal transmission is more protected than the high-speed transmission line in which the failure occurs. Self-healing is performed by switching to a high-speed transmission line. As a switching method, as shown in FIG. 13b, two high-speed transmission lines in the standby system are used for both of the two high-speed transmission lines in the set in which the failure occurs. Bi-directional switching method for switching to a path and a single high-speed transmission line for a standby system that transmits a signal in the same direction as the high-speed transmission line, as shown in FIG. There is a known uni-directional switching method.

Further, as shown in FIG. 14a, a multiplex conversion apparatus that performs multiplex conversion between a plurality of low-speed transmission paths and a high-speed transmission path, a part of the high-speed signal received from the high-speed transmission path (E) is converted into a plurality of low-speed signals. Is sent to each low-speed transmission line, and high-speed transmission line (E side; EAST side)
There is known an ADM that time-division-multiplexes the rest of the received high-speed signal and the low-speed signal received from the low-speed transmission path and transmits the result to another high-speed transmission path (W side; WEST side).

Also, as a configuration of a transmission system using such an ADM, a linear configuration in which ADMs are arranged between LTE as shown in FIG. 14b, and a plurality of ADMs in a ring shape as shown in FIG. A connected ring configuration is known.

In addition, in the linear configuration, signals are transmitted in the opposite directions on the E side and the W side in the drawing as shown in FIG. 15A, corresponding to the LTE 1: 1 configuration and 1: n configuration described above. A 1: 1 configuration in which a pair of working high-speed transmission lines and a pair of standby high-speed transmission lines that transmit signals in opposite directions are provided, as shown in FIG. For each of the W sides, a plurality of sets of working high-speed transmission lines that transmit signals in opposite directions to each other are provided, and are shared by the plurality of sets of high-speed transmission lines. A 1: n configuration is known in which a pair of two high-speed transmission lines for transmitting signals is provided. Here, the switching from the active high-speed transmission path to the standby high-speed transmission path during the self-healing of the ADM in the 1: 1, 1: n linear configuration is the above-described 1: 1, 1: n configuration. The same switching as in LTE is performed on each of the E side and the W side.

On the other hand, a ring configuration in which ADMs are connected in a ring shape includes a two-fiber configuration in which each ADM is connected by a pair of optical fiber transmission lines that transmit signals in opposite directions, and a reverse configuration between each ADM. A 4-fiber configuration has been proposed in which two sets of two optical fiber transmission lines for transmitting signals in the direction are provided.

As shown in FIG. 16a, the 4-fiber ring configuration uses one set of two optical fiber transmission lines connecting the ADMs as the active system and the remaining set as a standby system. BLSR is known. Further, in the two-fiber ring configuration as shown in FIG. 17a, an optical fiber transmission line that transmits a signal in one rotation direction is used as an active system, and an optical fiber transmission line that transmits a signal in a reverse rotation direction is used as a backup system. Rather than setting a 2-Fiber UPSR and an active system and a standby system for each optical fiber transmission line, a part of the time slots on each optical fiber transmission line is used as an active system, and the remaining time slots are used as a standby system. -Fiber BLSR is known.

FIGS. 16b and 16c show how the active system is switched to the standby system during self-healing in 4-Fiber BLSR. As shown in the figure, the switching performed by the ADM adjacent to the failure location in the 4-Fiber BLSR includes transmission of the standby side of the faulty side from the set of the active side optical fiber transmission lines on the side of the faulty side. Switching to a set of paths (b), returning a signal flow from a set of working optical fiber transmission lines on the opposite side to the fault location to a set of standby optical fiber transmission paths on the opposite side of the fault location ( There are two types of c).

FIG. 17b shows a state of switching from the active system to the standby system during self-healing in 2Fiber BLSR, and FIG. 17c shows a state of switching from the active system to the standby system during self-healing in 2fiber UPSR.

As shown in the figure, the switch in 2fiber BLSR is the ADM adjacent to the fault location.
However, by returning the signal flow in the active time slot of the two optical fiber transmission lines opposite to the failure location to the standby time slot of the standby system of the two optical fiber transmission paths opposite to the failure location, Done. In FIG. 17b, the time slot AF of the # 1 optical fiber transmission line and the time slot AF of the # 2 optical fiber transmission line are used as the active system, and the time slots GL and # 2 of the # 1 optical fiber transmission line are used. When the time slot GL of the optical fiber transmission line is used as a standby system, the ADMs A and B adjacent to the failure point change the signal flow of the time slot AF of the optical fiber transmission line of # 1 to # 2. The signal flow in the time slot AF of the # 2 optical fiber transmission line is turned back to the time slot GL of the optical fiber transmission line, and the signal flow in the time slot AF of the # 2 optical fiber transmission line is turned back to the time slot GL of the # 1 optical fiber transmission line.

The switching of 2Fiber UPSR is performed as shown in FIG. 17c. That is, each ADM transmits a signal to another ADM using both the working optical fiber transmission line and the standby optical fiber transmission line. Also, each ADM normally receives and processes signals from other ADMs received on the working optical fiber transmission line, and from the other specific ADM via the working optical fiber transmission line when a failure occurs. When the signal cannot be received, the signal from the other specific ADM received by the backup optical fiber transmission line is received and processed.

As described above, the functions required for the multiplex conversion apparatus are LTE used in a 1: 1 configuration, LTE used in a 1: n configuration, ADM used in a 1: 1 linear configuration, : ADM used for n linear configuration, ADM used for 4Fiber BLSR
It differs depending on the ADM used for 2Fiber BLSR and ADM used for 2Fiber UPSR. For this reason, LTE and ADM have conventionally been produced for each transmission system configuration as devices dedicated to the transmission system configuration.

For example, there is a case where it is desired to change the configuration of the transmission system in order to improve the transmission system after operation. For example, in order to expand the transmission capacity, when a transmission system using LTE with point-to-point connection in a 1: 1 configuration is to be changed to a transmission system using LTE with point-to-point connection in a 1: n configuration, 1:
There are cases where it is desired to change the transmission system using LTE with point-to-point connection in one configuration to 2 Fiber BLSR or 4 Fiber BLSR as the number of connection points increases.

  Conventionally, since each LTE or ADM is a dedicated device for the configuration of the transmission system before the change, it is necessary to replace the LTE or ADM when changing the configuration of such a transmission system. There was a problem that the burden of introducing the device when changing the system configuration was large. In addition, there is a problem that it is impossible to prevent the transmission system from going down once, that is, a state where normal transmission cannot be performed due to the replacement of LTE and ADM.

On the other hand, with the increase in transmission capacity of transmission systems in recent years, the scale of multiplex conversion equipment has also increased. For example, OC-192 compatible multiplex conversion using an optical fiber transmission line having a transmission capacity of 10G as a high-speed transmission line It is difficult to configure the device with a single rack. Here, the rack is a case with pattern wiring that accommodates the electronic boards constituting the multiplex conversion device and that connects between the electronic boards, and its size is limited due to handling requirements such as transportation and installation. There is. As described above, when the multiplex conversion device cannot be configured with a single rack and is configured with a plurality of racks, it is necessary to transmit and receive signals between the racks. However, in order to send and receive signals between racks, it is necessary to use cables instead of wiring with patterns on the electronic board. There are restrictions from the viewpoint of Therefore, for example, in LTE having a 1: n configuration, n active high-speed transmission lines and one standby high-speed transmission line are input to a single selector, and the above-described active system is used for the selector. It is difficult to adopt a configuration that switches the standby system.

  Therefore, the present invention provides a method for configuring a multiplexing system capable of changing the configuration of a transmission system by upgrading a multiplexing apparatus such as LTE or ADM used in an existing transmission system. Objective.

  Another object of the present invention is to provide a multiplex conversion device having a configuration suitable for constructing a multiplex conversion device using a plurality of racks.

  In order to achieve the above object, the present invention provides, for example, a signal between a high-speed transmission line interface unit responsible for signal input / output interface between a transmission / reception set of high-speed transmission lines and a transmission / reception set of low-speed transmission lines. A low-speed transmission line interface unit responsible for the input / output interface, a multiplex conversion unit that performs multiplexing / demultiplexing between a high-speed signal transmitted on the high-speed transmission line and a low-speed signal transmitted on the low-speed transmission line, and on the high-speed transmission line The signal interface with the outside of the unit that exchanges signals between the high-speed signal transmitted through the low-speed transmission path and the low-speed signal transmitted through the low-speed transmission path is made common with the signal interface with the outside of the unit of the multiplex conversion unit. A high-speed transmission line interface unit, a multiplex conversion unit, and a low-speed transmission line interface unit. Fixed multiplex conversion unit constructed by combining, to provide a method for constructing a multiplex conversion apparatus characterized by constructing a line editing apparatus by replacing the multiplex conversion unit of the fixed multiplex conversion unit to said exchange unit.

  According to such a construction method, it is possible to upgrade a fixed multiplex conversion device such as LTE to a line editing device such as ADM only by exchanging the multiplex conversion unit for an exchange unit. Can be changed.

In order to achieve the above object, the present invention uses, for example, n (where n is an integer of 1 or more) sets of active high-speed transmission lines and a pair of transmission / reception standby high-speed transmission lines and signals on the ground side. A multiple conversion device for transmitting
N active system devices from the first to the nth and one standby system device,
Each of the active devices is
A high-speed transmission line interface unit responsible for signal input / output interface between a set of active high-speed transmission lines and a plurality of low-speed transmission lines responsible for signal input / output interfaces between a set of transmission and reception low-speed transmission lines The interface unit and the high-speed transmission line interface unit demultiplex the high-speed signal received from the active high-speed transmission line and distribute it to each low-speed interface unit as a signal to be transmitted to the low-speed transmission line. A multiplex conversion unit that multiplexes low-speed signals received from the low-speed transmission path and sends them to the high-speed transmission path interface unit as a high-speed signal to be transmitted to the active high-speed transmission path; and a first relay unit connected to the multiplex conversion unit; Prepared,
The spare system device is at least
A high-speed transmission line interface unit that handles a signal input / output interface with a pair of standby high-speed transmission lines, and a second relay unit connected to the high-speed transmission line interface unit;
The second relay unit of the standby device is connected to the first relay unit of the first active device, and the mth (where m is an integer between 1 and n-1) of the active device of the mth. One relay unit is connected to the first relay unit of the m + 1 active system device,
The first relay unit of each connected active device and the second relay unit of the standby device are high-speed signals received by the high-speed transmission line interface unit of the standby high-speed transmission line from the standby high-speed transmission line. Are sequentially relayed as a high-speed signal to be demultiplexed in place of the high-speed signal received by the high-speed transmission line interface in the multi-conversion unit of any active system device. Forming a transfer system that relays the high-speed signal multiplexed by the multiple conversion unit to the high-speed transmission line interface unit of the standby apparatus as a high-speed signal to be transmitted from the standby high-speed transmission line Providing the device.

  According to the fixed multiplex conversion device configured as such a multiplex conversion device, the active high-speed system in which a failure has occurred can be obtained by relaying high-speed signals sequentially transmitted to and received from the standby high-speed transmission path between the relay units between the devices. The standby high-speed transmission line can be extended as an alternative to the failed active high-speed transmission line up to the multiple conversion unit of the active apparatus connected to the transmission line. Therefore, the capacity of the signal line necessary for the connection between the devices is sufficient corresponding to the transmission capacity of the standby high-speed transmission path.

  Hereinafter, an embodiment of the present invention will be described.

In this embodiment, a 10G interface for transmitting / receiving signals to / from optical fiber transmission lines such as optical / electrical and electrical / optical conversion, SOH that handles signal header processing, SELH that is a high-speed signal side selector, and high-speed Signal side selector SELH (P), high-speed signal side switch SWH, low-speed signal side switch SWL, PINF for sending and receiving signals between racks, low-speed signal side for exchanging signals between low-speed transmission paths Equipped with eight units of SELL as a selector and one or more types of units LINF to interface with the low-speed transmission path. By combining these, multiplexing of LTE, ADM, etc. corresponding to various configurations of transmission systems Build a conversion device. Each unit is composed of one or a plurality of electronic boards mounted on a rack.

Both the 10G interface and the SOH constitute a high-speed interface that serves as an interface with the optical fiber transmission line. Therefore, the 10G interface and the SOH may be handled as one high-speed interface unit.

  In this embodiment, as shown in FIG. 1, a multiplex conversion apparatus is configured using a rack having five slots. Each electronic board is connected to the rack according to the wiring provided on the rack. Here, in the description of the present embodiment, the names of COM, HS1, HS2, LS1, and LS2 are given to the slots.

The slot COM is mounted with an electronic board that carries various control systems responsible for processing such as clock generation, power supply control, system switching control, and maintenance control.

  First, FIG. 2 shows a case where an LTE with point-to-point connection in a 1: 1 configuration is constructed.

  As shown in a in the figure, the LTE configuration in this case includes two 10G interface units 10a and b, two SOH units 20a and b, two duplicated SELH units 30a and b, and a duplex configuration. The plurality of sets of SELL units 40a, b and the plurality of duplicated LIF units 50a, 50b. FIG. B also shows a rack slot in which each unit is mounted.

In the LTE configured as described above, during normal operation, an optical signal received from the working optical fiber transmission line 100a that transmits a signal at a transmission rate of 10G is received by the working (W) 10G interface 10a and an electrical signal. Then, the data is sent to the working SOH 20a, subjected to predetermined header processing, and sent to the working SELH 30a. This signal is sent to the working SEL 40a via the working SELH 30a, demultiplexed and sent to each working LIF 50a corresponding to the destination of each signal. Each active LIF 50 a converts the transmitted signal into a low-speed signal and transmits it to the low-speed transmission path 300.

Conversely, the signal received by each active LIF 50a from the low-speed transmission path 300 is time-division multiplexed by the active SELL 40a and sent to the active SELH 30a, and the active SOH 20a, spare The data is sent to both of the system SOs 20b and subjected to header processing, sent to the active 10G interface unit 10a and the standby 10G interface unit 10b, converted into an optical signal, and then converted to an optical signal, respectively. And transmitted to the standby transmission side optical fiber transmission line 200a. That is, the same signal obtained by time-division multiplexing the signal received from the low-speed transmission line 300 is transmitted to the transmission side optical fiber transmission lines 100b and 200b of the active system and the standby system. Therefore, in actuality, even during normal operation, each LTE receives exactly the same signal from the working optical fiber transmission line 100a and the standby optical fiber transmission line 200b. This signal is subjected to header processing by the standby SOH 20b and input to the active and standby SELHs.

In such a configuration, when a failure occurs in an active optical fiber transmission line, the following switching process is performed in the LTE receiving the signal from the optical fiber transmission line.

That is, the working SELH 30a selects a signal received from the standby SOH instead of the signal received from the working SOH 20a and sends it to the working SELL 40a. As described above, since the same signal is received from the working optical fiber transmission line 100a and the standby optical fiber transmission line 200b, the switching between the working system and the standby system shown in FIG. Complete.

  Now, a case where such a 1: 1 LTE configuration is upgraded to a 2Fiber BLSR ADM or a 2FIber UPSR ADM will be described.

Here, 2Fiber BLSR ADM and 2FIber UPSR ADM can be realized with the same configuration. FIG. 3a shows the configuration of this ADM, and FIG. 3b shows a rack on which each unit is mounted.

As can be seen from the figure, the upgrade to ADM in this case is to replace the two duplicated SELH30a and 30b in the LTE configuration shown in FIG. 1 with two duplicated SWH60a and 60b. This is realized by exchanging two duplexed SELLs 40a and 40b in the LTE configuration with two duplexed SWLs 70a and 70b. Where SELH and
The SWH has a common signal line interface with the rack, and both can be exchanged by removing the electronic board constituting the SELH from the rack and mounting the electronic board constituting the SWH on the rack.

  Now, the operation of ADM of 2Fiber UPSR is as follows.

Now, the W-side optical fiber transmission line 110a and the E-side optical fiber transmission line 120a are the active system, and the W-side optical fiber transmission line 110b and the E-side optical fiber transmission line 12 are used.
Assuming that 0b is a standby system, the signal of each time slot input from the W side optical fiber transmission line 110a is normally input to the SWH 60a via the 10G interface 10a and the SOH 20a, and is sent to the destination of the signal of each time slot. Accordingly, it is exchanged for SWL 70a and SOH 20b. Each signal sent to the SWL 70a is exchanged with the LIF 50a.
A signal from the LIF 50a is input to the SWH 60a via the SWL 70a and exchanged with the SOHs 20a and 20b. In addition, a signal from the E-side optical fiber transmission line 120b is also input to the SWH60a via the 10G interface 10b and the SOH20b, and the SWH60a exchanges the signal of each time slot with the SOH 20b according to the destination. . The signals exchanged from the SELH 60a to the SOHs 20a and 20b are respectively 10G interfaces 10
a and 10b, and transmitted to the optical fiber transmission lines 110b and 120a.

In such a configuration, for example, a failure occurs and a signal from the ADM upstream of the failure point is transmitted from the W-side optical fiber transmission line 110a with respect to the signal flow on the ring constituted by the active optical fiber transmission line. When the signal cannot be received, the SWH 60a of the ADM regards the signal received from the SOH 20b instead of the signal received from the SOH 20a for the signal from the ADM upstream of these failure points, and is to be exchanged with the SWL.

By performing such an operation by each ADM, the self-healing shown in FIG. 17C is realized.

Next, the operation of the ADM having the configuration of FIG. 3 in the case of 2 Fiber BLSR is as follows.

That is, with the focus on the relationship between the operation of the SWH 60a and the flow of each signal between the transmission lines so that the flow of each signal between the transmission lines becomes clearer, the operation of other parts will be omitted. In the ADM, signals input from the reception side optical fiber transmission lines 110a and 120b on both sides are input to the SWH 60a. Of the input signals, the signal in the working time slot is exchanged by the SWH 60a to the working time slot in the low-speed transmission path or the optical fiber transmission paths 110b and 120a. Also, the signal input from the low-speed transmission path is exchanged with the working time slot of the optical fiber transmission paths 110b and 120a by the SWH 60a. Also, the signals in the standby time slots input from the receiving optical fiber transmission lines 110a and 120b on both sides are relayed to the standby time slots on the opposite optical fiber transmission lines 110b, 120a, 120b, and 110a by the SWH60a. Is done.

On the other hand, at the time of self-healing, in two ADMs adjacent to the failed working optical fiber transmission line, the SWH60a cancels the relay of the signal between the spare slots, and the failed working optical fiber transmission line Replace the signal that was exchanged with the active system time slot with a spare system time slot of the optical fiber transmission line that transmits the signal from the ADM in the opposite direction to the failed active optical fiber transmission line. Like that. In addition, instead of the signal received from the working time slot of the working optical fiber transmission line in which the failure has occurred, the light that transmits the signal to the ADM in the opposite direction to the working optical fiber transmission line in which the failure has occurred The signal received from the standby time slot of the fiber transmission line is used to transmit the signal from the ADM in the opposite direction to the low-speed transmission line and the faulty active fiber transmission line. Make it a target of exchange to a time slot.

  By this operation, the switching operation at the time of self-healing shown in FIG. 17b is realized.

  Next, the case where the 1: 1 configuration LTE shown in FIG. 2 is upgraded to the 1: n configuration LTE will be described.

  Fig. 4a shows the LTE configuration of 1: n configuration, and Fig. 4b shows a rack on which each unit is mounted.

As shown in the figure, the LTE in this case is a backup optical fiber transmission line 200a, b.
Is connected to one standby system processing rack, and each of the active optical fiber transmission lines 100a, 100b, 110a, 110b,..., 1n0a, 1n0b is connected to n active system processes. Consists of racks for

Each rack constitutes a bay which is a functional unit of LTE having a 1: n configuration. n
The active processing bays 310, 320... Are configured by removing the standby 10G interface 10b from the 1: 1 configuration LTE shown in FIG. 1 and replacing the standby SOH 20b with PINF80. ing. Further, the standby processing bay 300 has a configuration in which two SELHs that are duplexed for current processing are replaced with two SELH (P) 90s that are duplexed.

Here, the interface of the signal line to the rack of each electronic board constituting the SOH20 and each electronic board constituting the PINF80 is standardized, and the electronic board constituting the PINF80 is removed by removing the electronic board constituting the SOH20 from the rack. Both can be exchanged by mounting the substrate on a rack. In addition, the signal line interface between each electronic board constituting SELH30 and each electronic board constituting SELH (P) 90 is shared, and the electronic board constituting SELH30 is removed from the rack and SELH ( By mounting the electronic board constituting P) 90 on a rack, both can be exchanged. In this embodiment, 1: 1 configuration LTE
Is upgraded to one of the active processing bays, and the other bays constituting the 1: n LTE are newly introduced, thereby converting the 1: 1 LTE to the 1: n LT.
Upgrade to E.

The normal operation of each bay of the active processing system in the LTE of FIG. 4 is the same as the operation of the LTE having the 1: 1 configuration described above, and the connected optical fiber transmission line of the active system and the low-speed transmission, respectively. Performs multiple conversion to and from the road. However, in LTE of 1: n configuration,
Normally, signals are not transmitted to the standby optical fiber transmission lines 200a and 200b.

In such a configuration, for example, consider a case where a failure occurs in the optical fiber transmission line 110a on the receiving side connected to the active bay 320. In this case, the SELH (P) of the bay 300 for the standby system processing is considered. 90 sends a signal from the standby optical fiber transmission line 200b received via the 10G interface 10 and the SOH 20 to the PINF 80. This signal is converted into a low-speed signal of, for example, 150M in each PINF 80, and then sent to the PINF 80 in the bay 310 via the optical interconnect connecting the racks. The PINF 80 in the bay 310 relays the signal sent from the bay 300 to the PINF in the bay 320. The PINF 80 in the bay 320 transmits the signal sent from the bay 310 to the SELH 30. The SELH 30 in the bay 320 selects the signal sent from the PINF 80 instead of the signal sent from the SOH 20, and sends it to the SELL 40.

Conversely, when a failure occurs in the transmission-side optical fiber transmission line 120b connected to the active bay 320, the SELH 30 in the bay 330 sends a signal to the PINF 80 instead of the SOH 20. The PINF 90 sends this signal to the PINF 90 in the bay 310. Bay 31
The 0 PINF 80 relays the signal sent from the bay 320 to the bay 300. The PINF 80 in the bay 300 that has received this signal converts this signal into a serial signal and sends it to the SELH (P) 90. The SELH (P) 90 sends the signal sent from the PINF 80 to the SOH 20. This signal is transmitted from the standby optical fiber transmission 200b.

  In other words, the standby optical fiber transmission line is extended by PINF 80 to the active processing system bay connected to the active optical fiber transmission line where the failure has occurred.

The above operation is performed by LTE at both ends of the active optical fiber transmission line in which a failure has occurred, whereby the uni direction switching in FIG. 13b is realized.

In addition, the bi direction switching in FIG. 13c is performed when the failure occurs in both the transmission side and the reception side optical fiber transmission lines connected to the same active processing bay.
This is realized by the same operation as switching.

  However, as shown in FIG. 5, bi diretion switching may be realized by a configuration in which the PINFs 80 of each bay are connected in a ring shape.

In this configuration, the standby receiver optical fiber transmission line by PINF80 is extended to the active processing system bay connected to the failed active optical fiber transmission line, and the standby transmitter optical fiber transmission by PINF80. Extension of the path to the active processing bay connected to the faulty active optical fiber transmission path is performed using a different path. For example, as shown in the figure, the extension to the bay 320 of the standby reception side optical fiber transmission line 200a is performed via the PINF 80 of the bays 300 and 310, but to the bay 320 of the standby transmission side optical fiber transmission line 200b. Extension of bay 320, 330 ... 3n0, 300 PINF80
Do through.

  This ring-shaped configuration has an advantage that the amount of hardware can be reduced, for example, the number of signal lines connecting the racks can be reduced.

  Next, the case of upgrading the ADM of 2Fiber BLSR and ADM of 2FIber UPSR shown in FIG. 3 to ADM of 4Fiber BLSR will be described.

  The configuration of the ADM in this case is shown in FIG. 6a, and the rack on which each unit is mounted is shown in FIG. 6b.

As shown in the figure, the ADM in this case is an active optical fiber transmission line 110a, b1.
An active processing rack to which 20a and b are connected and a standby processing rack to which the optical fiber transmission lines 200a, b, 210a and b of the standby system are connected. The bay corresponding to each rack has the same configuration as the ADM of 2Fiber BLSR and ADM of 2FIber UPSR shown in FIG. Therefore, in this case, for example, the existing 2Fiber BLSR or 2FIber UPSR ADM is used as one bay of the 4Fiber BLSR ADM, and another bay with the same configuration is newly introduced between the two SWH60a and 60b. This is done by connecting with an optical interconnect. It should be noted that a 1: 1 configuration LTE can be upgraded to a 4Fiber BLSR ADM, as will be understood from the fact that a 1: 1 configuration LTE can be upgraded to a 2Fiber BLSR or 2FIber UPSR ADM.

  Now, the operation of the ADM in FIG. 6 is as follows.

That is, with the focus on the relationship between the operation of the SWH 60a and the flow of each signal between the transmission lines so that the flow of each signal between the transmission lines becomes clearer, the operation of other parts will be omitted. In the active bay 400, signals input from the receiving optical fiber transmission lines 110a and 120b on both sides are input to the SWH 60a. The input signal of each time slot is exchanged with the time slot of the low-speed transmission path or the optical fiber transmission paths 110b and 120a on the opposite side by the SWH 60a. The signal input from the low-speed transmission path is exchanged with the time slots of the optical fiber transmission paths 110b and 120a by the SWH 60a.

Further, the SWH 60a in the standby processing bay 410 relays the signal received from the optical fiber transmission line 200a to the optical fiber transmission line 210a as it is, and the signal received from the optical fiber transmission line 210b as it is to the optical fiber transmission line. Relay to 210b.

During self-healing, for example, when a failure occurs in the working optical fiber transmission lines 120a and 120b on the E side, the SWH 60a in the working system bay 400 moves toward the working optical fiber transmission line 120a. The exchanged signal is sent to the SWH 60a in the bay 410 for standby system processing. Further, instead of the signal received from the active optical fiber transmission line 120b, the signal received from the standby processing bay 410 is set as the object of exchange. On the other hand, the SWH 60a of the standby processing bay 410 cancels the relay operation between the standby optical fiber transmission lines described above, and when the switching shown in FIG. Replace the fiber transmission line 200b with the signal received from the optical fiber transmission line 200a.
Send to. The SWH 60a of the standby processing bay 410 cancels the above-described relay operation between the standby optical fiber transmission lines, and when the switching shown in FIG. The signal is exchanged for the fiber transmission line 210a and the signal received from the optical fiber transmission line 210b is sent to the SWH60 in the bay 400.

When the above operation is performed by the ADM adjacent to the failure location, FIG.
The self-healing shown in is realized.

Next, the case of upgrading the ADM of 2Fiber BLSR and ADM of 2FIber UPSR shown in FIG. 3 to ADM having a 1: 1 linear configuration will be described.

  The configuration of the ADM in this case is shown in FIG. 7a.

As shown in the figure, the ADM in this case is the same as the configuration of the ADM in the case of the 4 Fiber BLSR shown in FIG. Therefore, the upgrade can be performed by replacing the same unit. Further, as described above, this configuration can also be configured by upgrading the LTE having a 1: 1 configuration.

  Also, the normal operation is the same as in the case of 4Fiber BLSR. Further, the operation at the time of self-healing shown in FIG. 15B is the same as the case of performing the switching operation of FIG. 16B in the case of 4Fiber BLSR.

Finally, a case of upgrading to an ADM having a 1: n linear configuration will be described.

  The configuration of the ADM in this case is shown in FIG.

As shown, the ADM in this case is the ADM with the 1: 1 linear configuration shown in FIG. 7a.
The two 10G interfaces 10a and 10b are omitted, the two SOHs 20a and b are replaced with two PINFs 80a and b, the east bay 810 and the remaining west bay 811. A total of 1 + n bay sets 800 to 80n, which are a combination of East Bay and West Bay, are provided for the standby system and n groups for the current system, and PINF80a and b for each bay set are used for the standby system bay. It has a configuration in which the set 800 is sequentially connected in a chain shape so as to be at the end.

Therefore, one of the plurality of bay sets of the ADM can be constructed by using the ADM having a 1: 1 linear configuration. Also, as can be understood from FIG. 8a, each east bay omits the 10G interface of each 1: n LTE bay, replaces SELH with SWH, SOH with PINF, and SELL with SWL. The PINFs are sequentially connected. Therefore, a 1: n linear configuration ADM can also be upgraded from a 1: n configuration LTE.

Now, the standby bay set 800 is connected to one transmission / reception optical fiber transmission line for each of the east side and the west side. In addition, each of the working n bay sets 801 to 80n is connected to one working optical fiber transmission line for each of the east side and the west side.

Normally, the waist bay of each active bay set 800 performs the same operation as that of the active bay of the ADM having the 1: 1 linear configuration described above. This realizes transmission between ADMs or between ADMs and LTE using n active transmission lines.

On the other hand, when a failure occurs in the waist side optical fiber transmission line of the second active system ebay set during self-healing, as in the case of the LTE of the 1: n configuration described above, the standby bay Set West Bay 10G interface, SOH, SWH, Standby Bay Set Eastto Bay SWH, PINF, First Active Bay Set East Bay PINF, Second Active Bay Set East By relaying signals in the order of SWH in the west bay of the second active bay set in the order of PINF and SWH in the bay active system, the standby optical fiber transmission line on the west side is the second active bay set. Extended to West Bay's SWH. And it is used instead of the west side optical fiber transmission line where the failure has occurred by the SWH of the west bay of the second working bay set.

Such an operation is performed by the ADMs at both ends of the failed optical fiber transmission line, so that switching from the working optical fiber transmission line to the standby optical fiber transmission line is realized.

In addition, the connection of each bay set in FIG. 8 is made in a ring shape like the LTE of the 1: n configuration shown in FIG. 5, and the extension optical fiber transmission line is extended to each bay set. May be performed by relaying the signal only in one rotation direction on the ring. For example, when a failure occurs in the west-side optical fiber transmission line of the second active system ebay set, as in the case of the LTE having the 1: n configuration described above, 10G of the bay set in the standby system bay set Interface, SOH, SWH, standby bay set Eastto Bay SWH, PINF, first active bayset East Bay PINF, second active bayset East Bay active PINF By transferring signals to the SWH in the order of the SWH of the second active bay set, the standby optical fiber transmission line on the receiver side of the west side is transferred to the SWW of the second active bay set. Extend to SWH. Also, the second active bay set West Bay active SWH, the second active bay set East Bay active SWH, PINF, the third active bay set East Bay Active PINF, ..., nth active bay set, East Bay active PINF, standby bay set, East Bay, PINF, SWH, standby bay set, West Bay By repeating the signals in the order of the SWH, SOH, and 10G interfaces, the standby optical fiber transmission line on the west side is extended to the active SWH in the west bay of the second active bay set.

As described above, according to the present embodiment, it is possible to upgrade the multiplex conversion device while using the configuration of the existing multiplex conversion device. Further, as described above, the configurations of each unit of LTE of 1: 1 configuration and ADM of 2Fiber BLSR / 2FIber UPSR are all duplicated. Therefore, when upgrading, it is possible to continue the operation of the transmission system by exchanging necessary units for each of the two systems of the duplexed system and using the other system during the replacement.

However, if there is a difference in the delay time between the input / output signals of SELH, SELP, and SWH that occurs due to the processing in SELH, SELH (P), and SWH described above, signal loss or duplication will occur when this system is switched. Such a problem will occur.

Therefore, in this embodiment, the SELH is configured as shown in FIG. 9a, and the SELH (P) is configured as shown in FIG. 9b, so that the delay times in these units are matched.

Here, a switch for exchanging time slot signals such as SWH includes a memory 900 as shown in FIG. 10, a write circuit 901 for sequentially writing the signals of each incoming time slot to the memory, and a control (not shown). The signal time slots are exchanged by the readout circuit 902 that reads out the signals of each time slot from the memory in the order set by the apparatus. For this reason, a delay time equal to or more than the time corresponding to the number of time slot numbers is usually generated. This delay time depends on SELH or SELH (
Generally, it is larger than the delay time in a selector that performs a selection operation such as P).

Therefore, in this embodiment, as shown in FIG. 9, a delay circuit 300 for adjusting a signal delay time is provided in SELH and SELH (P). As shown in FIG. 11, the delay circuit 300 sequentially generates an address in the memory 301 to which the signal of each incoming time slot is written, and adds an offset for the time to be adjusted to the count value of the sequential counter. The decoder 303 is used as a read address. According to such a delay circuit 300, the time from when a signal is written to the memory until it is read can be adjusted by appropriately setting an offset value to which the decoder 303 adds.

In FIG. 9a, reference numeral 310 denotes a selector that selects whether a signal sent from the active SOH or a signal sent from the standby SOH or PINF is sent to the SELL.

  In FIG. 9b, reference numeral 320 denotes a selector for sending the signal sent from the PINF to the backup optical fiber transmission line.

As the SELH and SELH (P) shown in FIG. 9, a unit including three selectors 331, 332, and 333 as shown in FIG. 12 can be used in common. In this case, when used as SELH (P), the selection of the selectors 301 and 302 is fixed so as to form the same signal flow as in FIG. 9b, and when used as SELH, the selection of the selectors 302 and 303 is selected as shown in FIG. Is fixed to form the same signal flow.

  The configuration of the interface frame of the optical fiber transmission line according to this embodiment includes a SONET OC-N frame configuration having a transmission rate of 51.84 Mb / s or a multiple of the transmission rate of 51.84 Mb / s, and a transmission rate. The STM-N frame structure in the SDH hierarchy specified in the ITU recommendation having a transmission rate of 155.52 Mb / s or a multiple of the transmission rate of 155.52 Mb / s can be used.

  As described above, according to the present embodiment, it is possible to upgrade the multiplex conversion device while using the configuration of the existing multiplex conversion device.

  Further, as in the case of LTE having the 1: n configuration described above, a signal that needs to be transmitted and received between racks when a multiplex conversion apparatus is configured with a plurality of racks and switching between the active system and the standby system is performed. Can be kept relatively low.

  As described above, according to the present invention, there is provided a method for configuring a multiplexing system capable of changing the configuration of a transmission system by upgrading a multiplexing converter such as LTE or ADM used in an existing transmission system. Can be provided.

  In addition, the present invention can provide a multiplex conversion device having a configuration suitable for constructing a multiplex conversion device using a plurality of racks.

It is the figure which showed the structure of the rack used for a multiplex converter. It is the figure which showed the structure of LTE of 1: 1 structure. It is the figure which showed the structure of ADM applied to 2Fiber UPSR / BLSR. It is the figure which showed the structure of LTE of 1: n structure. It is the figure which showed the structure of LTE of 1: n structure. It is the figure which showed the structure of ADM applied to 4Fiber BLSR. It is the figure which showed the structure of ADM of 1: 1 linear structure. It is the figure which showed the structure of ADM of 1: n linear structure. It is the figure which showed the structure of the SELH unit and the SELH (P) unit. It is the figure which showed the structure of the circuit which replaces | exchanges a time slot using a memory. It is the figure which showed the structure of the delay circuit. It is the figure which showed the structure of the unit which can be shared as a SELH unit and a SELH (P) unit. It is the figure which showed the structure of the transmission system using LTE. It is the figure which showed the structure of the transmission system using ADM. It is the figure which showed the switching from the active system of the high-speed transmission path in LTE to a backup system. It is the figure which showed how the high-speed transmission line in 4Fiber BLSR was switched from the active system to the backup system. It is the figure which showed how the high-speed transmission line in 2Fiber UPSR and 2Fiber BLSR was switched from the active system to the backup system.

Explanation of symbols

10 10G interface unit
20 SOH unit
30 SELH unit
40 SELL unit
50 LIF unit
60 SWH unit
70 SWL unit
80 PINF unit

Claims (11)

A high-speed transmission line interface unit responsible for signal input / output interface between the transmission / reception set of high-speed transmission lines, and a low-speed transmission line interface unit responsible for signal input / output interface between the transmission / reception set of low-speed transmission lines; A multiplex conversion unit that performs multiplexing / demultiplexing between a high-speed signal transmitted on a high-speed transmission path and a low-speed signal transmitted on a low-speed transmission path, and a high-speed signal transmitted on the high-speed transmission path and a low-speed transmission path An exchange unit that exchanges a signal with a low-speed signal and that shares a signal interface with the outside of the unit with a signal interface with the outside of the unit of the multiplex conversion unit is prepared,
A line editing apparatus in which a fixed multiplex conversion apparatus constructed by combining the high-speed transmission path interface unit, the multiplex conversion unit, and the low-speed transmission path interface unit is replaced with the switching unit in the fixed multiplex conversion apparatus. A construction method of a multiple conversion apparatus characterized by constructing A method for constructing a multiple conversion device according to claim 1,
Multiplex conversion characterized in that the multiple conversion unit is provided with delay means for matching the delay time between the input and output signals of the signal in the multiple conversion unit with the delay time between the input and output signals of the signal in the switching unit. Device construction method. A high-speed transmission line interface unit responsible for signal input / output interface between the transmission / reception set of high-speed transmission lines, and a low-speed transmission line interface unit responsible for signal input / output interface between the transmission / reception set of low-speed transmission lines; Multiplexing / demultiplexing between a high-speed signal transmitted on a high-speed transmission path and a low-speed signal transmitted on a low-speed transmission path, a multiple conversion unit for selecting a high-speed signal to be multiplexed / demultiplexed, and multiple conversion A signal interface between the high-speed transmission line interface unit and the multiplex conversion unit is a signal interface between the multiplex conversion unit and a unit that relays a high-speed signal to be multiplexed / demultiplexed to the outside. And a common relay unit,
One high-speed transmission line of a fixed multiplex conversion apparatus that performs transmission using two sets of high-speed transmission lines constructed by combining the two high-speed transmission line interface units, the multiplex conversion unit, and the plurality of low-speed transmission line interface units. Replacing the interface unit with the relay unit, the first element device,
Introducing a plurality of second element devices constructed by combining one high-speed transmission line interface unit, a relay unit, a multiplex conversion unit, and a plurality of low-speed transmission line interface units,
By connecting the first element device and the plurality of second element devices sequentially between the relay units of the first element device and the plurality of second element devices, two or more sets of high speeds are achieved. A method of constructing a multiple conversion device, comprising: forming a fixed multiple conversion device that performs transmission using a transmission line. a multiplex conversion device for transmitting signals to the ground side using n (where n is an integer of 1 or more) sets of active high-speed transmission lines and a pair of transmission / reception standby high-speed transmission lines;
N active system devices from the first to the nth and one standby system device,
Each of the active devices is
A high-speed transmission line interface unit responsible for signal input / output interface between a set of active high-speed transmission lines and a plurality of low-speed transmission lines responsible for signal input / output interfaces between a set of transmission and reception low-speed transmission lines The interface unit and the high-speed transmission line interface unit demultiplex the high-speed signal received from the active high-speed transmission line and distribute it to each low-speed interface unit as a signal to be transmitted to the low-speed transmission line. A multiplex conversion unit that multiplexes low-speed signals received from the low-speed transmission path and sends them to the high-speed transmission path interface unit as a high-speed signal to be transmitted to the active high-speed transmission path; and a first relay unit connected to the multiplex conversion unit; Prepared,
The spare system device is at least
A high-speed transmission line interface unit that handles a signal input / output interface with a pair of standby high-speed transmission lines, and a second relay unit connected to the high-speed transmission line interface unit;
The second relay unit of the standby device is connected to the first relay unit of the first active device, and the mth (where m is an integer between 1 and n-1) of the active device of the mth. One relay unit is connected to the m + 1st relay unit,
The first relay unit of each connected active device and the second relay unit of the standby device are high-speed signals received by the high-speed transmission line interface unit of the standby high-speed transmission line from the standby high-speed transmission line. Are sequentially relayed as a high-speed signal to be demultiplexed in place of the high-speed signal received by the high-speed transmission line interface in the multi-conversion unit of any active system device. Forming a transfer system that relays the high-speed signal multiplexed by the multiple conversion unit to the high-speed transmission line interface unit of the standby apparatus as a high-speed signal to be transmitted from the standby high-speed transmission line apparatus. a multiplex conversion device for transmitting signals to the ground side using n (where n is an integer of 1 or more) sets of active high-speed transmission lines and a pair of transmission / reception standby high-speed transmission lines;
N active system devices from the first to the nth and one standby system device,
Each of the active devices is
A high-speed transmission line interface unit responsible for signal input / output interface between a set of active high-speed transmission lines and a plurality of low-speed transmission lines responsible for signal input / output interfaces between a set of transmission and reception low-speed transmission lines The interface unit and the high-speed transmission line interface unit demultiplex the high-speed signal received from the active high-speed transmission line and distribute it to each low-speed interface unit as a signal to be transmitted to the low-speed transmission line. A multiplex conversion unit that multiplexes low-speed signals received from the low-speed transmission path and sends them to the high-speed transmission path interface unit as a high-speed signal to be transmitted to the active high-speed transmission path; and a first relay unit connected to the multiplex conversion unit; Prepared,
The spare system device is at least
A high-speed transmission line interface unit that handles a signal input / output interface with a pair of standby high-speed transmission lines, and a second relay unit connected to the high-speed transmission line interface unit;
The second relay unit of the standby system device and each first relay unit of each active system device are sequentially connected in a ring shape,
Each first relay unit of each of the active devices and the second relay unit of the standby device connected in a ring form a transfer system that transfers a signal in one rotation direction with respect to the ring, and the transfer system is The high-speed signal received from the standby high-speed transmission line by the high-speed transmission line interface unit of the standby high-speed transmission line is received by the multi-conversion unit of any active system device via the high-speed transmission line interface in the multi-conversion unit. The high-speed signal relayed as a high-speed signal to be demultiplexed instead of the high-speed signal, and the high-speed signal multiplexed by the multiplex conversion unit of any active apparatus is used as the high-speed signal to be transmitted from the standby high-speed transmission path. A multiplex conversion device relaying to a high-speed transmission line interface unit of a system device. For each of the east side that is the first ground side and the west side that is the second ground side, n (where n is an integer of 1 or more) sets of active high-speed transmission lines and a pair of transmission and reception standby high-speed transmissions A multi-conversion device that transmits signals to the ground side using a road,
N active system devices from the first to the nth and one standby system device,
Each of the active devices is
Signal input / output interface between a high-speed transmission line interface unit responsible for a signal input / output interface between one set of transmission / reception high-speed transmission lines on each of the east side and the west side, and a pair of transmission / reception low-speed transmission lines A plurality of low-speed transmission line interface units, and exchange of signals between two active high-speed transmission lines on the opposite side with respect to the east side and the west side and between the active high-speed transmission line and each low-speed transmission line An exchange unit to perform, and a first relay unit connected to the exchange unit,
The spare system device is at least
A high-speed transmission line interface unit that bears an input / output interface for signals between a pair of transmission / reception standby transmission lines on the east side and the west side, and a second relay unit connected to the high-speed transmission line interface unit,
The second relay unit of the standby device is connected to the first relay unit of the first active device, and the mth (where m is an integer between 1 and n-1) of the active device of the mth. One relay unit is connected to the m + 1st relay unit,
The first relay unit of each connected active device and the second relay unit of the standby device are high-speed signals received by the high-speed transmission line interface unit of the standby high-speed transmission line from the standby high-speed transmission line. Are sequentially relayed to the switching unit of any active system device as a high-speed signal to be exchanged instead of the high-speed signal received by the high-speed transmission line interface in the switching unit, and the switching unit of any active system device Forming a transfer system that relays the high-speed signal exchanged toward the high-speed transmission line interface to the high-speed transmission line interface unit of the standby system device as a high-speed signal to be transmitted from the standby high-speed transmission line. Multiple conversion device. For each of the east side that is the first ground side and the west side that is the second ground side, n (where n is an integer of 1 or more) sets of active high-speed transmission lines and a pair of transmission and reception standby high-speed transmissions A multi-conversion device that transmits signals to the ground side using a road,
N active system devices from the first to the nth and one standby system device,
Each of the active devices is
Signal input / output interface between a high-speed transmission line interface unit responsible for a signal input / output interface between one set of transmission / reception high-speed transmission lines on each of the east side and the west side, and a pair of transmission / reception low-speed transmission lines A plurality of low-speed transmission line interface units, and exchange of signals between two active high-speed transmission lines on the opposite side with respect to the east side and the west side and between the active high-speed transmission line and each low-speed transmission line An exchange unit to perform, and a first relay unit connected to the exchange unit,
The spare system device is at least
A high-speed transmission line interface unit that bears an input / output interface for signals between a pair of transmission / reception standby transmission lines on the east side and the west side, and a second relay unit connected to the high-speed transmission line interface unit,
The second relay unit of the standby system device and the first relay unit of each active system device are sequentially connected in a ring shape,
The second relay unit connected in a ring shape and the first relay unit of each active device form a transfer system that transfers a signal in one rotation direction with respect to the ring, and the transfer system includes the backup high-speed transmission. The high-speed signal received from the standby high-speed transmission line by the high-speed transmission line interface unit of the path is sequentially exchanged for the switching unit of any active system device instead of the high-speed signal received by the high-speed transmission line interface in the switching unit. A high-speed signal that is relayed as a high-speed signal to be subjected to the transmission and is exchanged toward a high-speed transmission path interface by a switching unit of any active system apparatus is used as the high-speed signal to be transmitted from the standby high-speed transmission path. A multiplex conversion device relaying to a high-speed transmission line interface unit. A method for constructing a multiple conversion device according to claim 3,
A method of constructing a multiplex conversion device, wherein each relay unit is connected using an optical transmission medium. The multiple conversion device according to claim 4, 5, 6, or 7,
A multiplex conversion apparatus using an optical transmission medium as a connection medium for connecting each relay unit. A method for constructing a multiple conversion device according to claim 1,
As the interface frame configuration of the high-speed transmission path, the transmission speed 51.84Mb / s,
Alternatively, a method of constructing a multiplex conversion device using a SONET OC-N frame configuration having a transmission rate that is a multiple of a transmission rate of 51.84 Mb / s. A method for constructing a multiple conversion device according to claim 1,
As the interface frame configuration of the high-speed transmission path, the STM-N frame configuration in the SDH hierarchy specified in the ITU recommendation having a transmission rate of 155.52 Mb / s or a multiple of the transmission rate of 155.52 Mb / s is used. A method of constructing a multiple conversion device, characterized in that:

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