JPH118641A - Transmitter and upgrade method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To compactly upgrade a transmitter by providing the transmitter with pluralities of shelves of the same configuration and arranging absolute minimum shelves on one unit on request thereby decreasing the number of units. SOLUTION: This transmitter is constituted of N (N>=2) shelves at full mount, namely of a 1st shelf 1 consisting of a low speed interface section 14, a selector section 13, a 1st high speed interface section 11 and a switch section 22, an n-th (2<=n<=N) shelf 2 whose configuration is the same as that of the 1st shelf, and cables 32, 33 interconnecting the 1st shelf and the n-th shelf. In this way, the 1st shelf only is enough to operate a compact system. Furthermore, one transmitter is used for two system forms by having only to replace a board of a switch section in the 1st shelf with a board required for a service so as to easily change the system form. The system is upgraded to a 2nd operation form while in-service.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a transmission apparatus having a multi-shelf structure that must support various system configurations, and more particularly to a transmission apparatus and an upgrade method that can be upgraded with a low initial investment.

[0002]

2. Description of the Related Art With the remarkable development of multimedia in recent years, there is a demand for a high-speed and large-capacity communication backbone transmission line. In a trunk system (long-distance system) transmission line, it can be said that it is more cost-effective to combine the lines and increase the capacity for transmission. A point-to-point multiplex transmission apparatus LTE having a large capacity as a trunk system (long-distance system) main transmission line
(Line Terminal Equipment)
At present, is being commercialized, the influence is also exerted on regional transmission line forms and the like.

[0003] Considering the demands on regional transmission lines, considering the system configuration, rather than simply increasing the capacity of a point-to-point multiplexing transmission device LTE, the transmission line redundancy configuration and the like must be considered.
Emphasis is shifting to the construction of various network configurations that guarantee the normal operation of the system.

A transmission path system known as a network configuration having such a transmission path redundancy configuration includes:
(1) The working system and the protection system transmission line are provided as a pair, and when a failure occurs, the system switches from the working system to the protection system.
TE1: 1 configuration, (2) LTE1: N configuration having one standby system for N active systems, (3) LTE devices are linearly arranged, and from the west side to the east side (or LADM (Linear Add Drop Mul) having the function of through connection of the reverse) and the function of drop add connection to the interface side in the low-speed tributary device.
tip) configuration, (4) from the viewpoint of reliability and flexibility of system construction, as a ring network often used in a local system, the ends of the LADM are connected in a ring shape, and two fibers are used. Two-fiber BLSR that connects each node and divides the line capacity into two for the working system and the protection system
(Bi-directional Line Switch
(5) Although the configuration itself is the same as that of the two-fiber BLSR, the UPSR (Uni-directio) passes through a node having a different signal transmission path from the WEST side to the EAST side (or vice versa) during normal operation.
nal Path SwitchedRing),
(6) By providing twice as many fibers as the two-fiber BLSR, a span switch that switches to the standby system of the same node and a ring switch that switches to the transmission standby system in the direction opposite to the transmission direction of the active system while avoiding a failure section. Four-fiber BLSR that has two configurations and can cope with double faults
What is known.

Japanese Patent Application Laid-Open No. 7-66821 describes the necessity of such a ring network configuration, but does not describe a system upgradeability. As described above, there are many conventional examples in which various device configurations have different configurations for each device in order to support various required services.

[0006] NEC Technical Report Vol. 49 No. 5 (1
996), the configuration of a 2.5 Gbit / s optical transmission system will be described. In this configuration, a high-speed shelf (HS subblack) and a plurality of low-speed shelves (M
S subblock), and an ADM apparatus is constructed by these three shelves. As seen in this example,
The method of dividing into a shelf accommodating a high-speed interface unit and a shelf accommodating a low-speed interface unit has been often used in the LTE system.

This LTE system will be described with reference to FIG. FIG. 7 illustrates an upgrade from a system transmitted in a basic LTE configuration in which the stations A and B face each other point-to-point, to a three-station configuration including the stations A, B, and C. FIG. This upgrade goes beyond just setting up station C, and adding another L to station B.
It is necessary to add a TE device and connect the low-speed interfaces back to back as shown in the figure. However, in this method, the cost of LTE for almost two units is required for adding one station, and the economical efficiency is poor. Moreover,
Since the connection is made on the low-speed side, there is a problem that a signal passing path is complicated and reliability is poor.

For the purpose of avoiding this problem, Japanese Patent Laid-Open Publication No. Hei 7-1995 discloses one method for guaranteeing upgradeability from a linear system to a ring system without changing the hardware scale.
It is proposed in Japanese Patent No. 212381. This is because the space switch in the switching LSI is connected to one input of an add-drop switch and one output of the second space switch to an input stage of a selector that can be selected in time slot units, so that only software exchange is required. It is possible to switch between various system network systems. The present invention has the same purpose as the above invention, but differs in that the system is changed by replacing a circuit board or the like.

A method of dividing the main functions of a conventional transmission apparatus will be described with reference to FIGS. Here, the division of functions means the allocation of function blocks to shelves and circuit boards. FIG. 5 is a diagram illustrating division of functional blocks into shelves and circuit boards in a conventional transmission device.

As is apparent from FIG. 5, in the conventional transmission device, (1) a first high-speed interface unit 51-1, a second high-speed interface unit 51-2, and a switch unit 52 sandwiched therebetween. And 156 connecting these functional units.
A high-speed shelf 501 including an Mbit / s back panel wiring transmission line and a common unit that performs monitoring control and the like;
(2) Low-speed interface unit 54 and selector unit 53
A low-speed shelf 502-1 composed of a 156 Mbit / s back panel wiring transmission line for connecting these functional units, and a common unit for monitoring and control, and (3) a low-speed shelf 502-1. It is composed of another low-speed side shelf 502-2 having the same configuration, (4) a plurality of low-speed side shelves, and a 156 Mbit / s cable transmission line connecting between the high-speed side shelves. The plurality of low-speed shelves 502 and the high-speed shelves 501 having this configuration are each divided into functions for a plurality of circuit boards.

With such a divided configuration, the LTE system,
When operating each system such as an ADM system, at least a plurality of high-speed shelves and low-speed shelves are required. Particularly, in the case of a simple LTE system in which a low-speed interface is multiplexed to a high-speed interface, Unnecessary empty slots are generated, for example, the second high-speed interface unit in the high-speed shelf is unnecessary. FIG. 6 shows a board mounting example of such a shelf.
In the present invention, the shelf is a shelf-shaped storage unit having a plurality of slots for inserting and housing a large number of circuit boards in parallel with each other, and is called a unit, a subrack, or the like by some manufacturers.

[0012]

SUMMARY OF THE INVENTION A transmission system for mounting an LSI or a circuit board capable of supporting various system configurations and a transmission apparatus for realizing an upgrade by adding a shelf having a different configuration have the above-described configuration. Is disadvantageous in recent competition for lowering the price of communication devices.

[0013] In general, in many cases, only a part of the low-speed interface capacity is used in consideration of future expansion, and the low-speed interface is not mounted at all at the beginning of operation. It is an object of the present invention to reduce the price of the system by changing the switch section to a board with wiring tangents according to the system configuration, and to have a plurality of shelves of the same configuration, In addition, since the system can be compactly upgraded by reducing the number of units by arranging the minimum required mounting in one unit, a low-cost device according to the configuration can be provided.

[0014]

When the present invention is fully mounted, N
(N ≧ 2) In a transmission device composed of shelves, L
Transmission equipment compatible with TE and ADM systems is (1)
A low-speed interface unit, a selector unit for selecting a redundant system of the low-speed interface unit located above the low-speed interface unit, a first high-speed interface unit, and the selector unit and the first high-speed interface unit. A first shelf, (2) a low-speed interface unit and a selector unit, and an n-th (2 ≦ n ≦ N) high-speed interface unit, comprising a switch unit and a common unit that performs monitoring and control of the switches. And (3) a cable connecting between the first shelf and the n-th shelf, the cable being connected between the first shelf and the n-th shelf.

[0015] With this split configuration, a compact system can be operated only with the first shelf, and at this time, the main signal is realized without cables.

In addition, if necessary, an n-th (2 ≦ n ≦ N) shelf having the same configuration as the first shelf may be added from a system that can be compactly configured only with the first shelf. You can upgrade to a system with twice the capacity of the low-speed section. The same device can be used in two system configurations only by compatible insertion of a board required for service into a board of a switch unit in the first shelf, and a change of the system can be easily achieved. The system change can be upgraded to the second operation mode in-service.

In the division system according to the present invention, although the capacity of the low-speed interface is divided and mounted, it is rare that all the low-speed interfaces are used in actual operation. Since it is possible, there is an advantage that initial introduction is easy in terms of cost. Further, the ADM device can be supported simply by replacing the board of the switch section, and the expansion can be performed smoothly. The system design in consideration of the upgradeability as described above is very important in the future as the required services become more versatile and complicated.

[0018]

FIG. 1 is a block diagram showing an embodiment of the present invention.
4 to FIG. 4 and FIG. 8 to FIG.

[First Embodiment] A first embodiment of the transmission apparatus according to the first embodiment of the present invention will be described with reference to FIGS. First, an LTE and ADM system upgrade method in a transmission apparatus according to the present invention will be described with an example where N = 2 in a transmission apparatus configured with N (N ≧ 2) shelves when fully mounted. 1 and 2 are diagrams showing the block configuration.

FIG. 1 shows a case where the operation mode is the LTE system, and this configuration is arranged in a first shelf 1 as shown in FIG.
Several low-speed side interface units 14 and the first high-speed side interface unit 11 include a selector unit 13 and a switch unit 12.
Is communicated on the 156 Mbit / s back panel wiring transmission line 31 via the. Further, a wiring board 121 having only a pattern wiring is disposed in the switch section 12 between the selector section 13 and the first high-speed transmission side interface section 11.

By adopting such a simple configuration, the signal input from the low-speed interface is multiplexed / separated to the high-speed transmission interface, so that the low-speed interface 14 is further multiplexed. The LTE system is constructed with one shelf by mounting only a low-speed interface board of a half of the signal capacity instead of the number of accommodated signal capacities. At this time, the common unit 15 for monitoring and controlling each of the functional units described above is accommodated in the first shelf 1.

FIG. 2 shows the case where the operation mode is the ADM system. This configuration will be described. In addition to the first shelf 1 'having a similar configuration at the time of the LTE system,
A second shelf 2 'having a similar configuration to that of the E system is prepared. In the second shelf 2 ', several low-speed side interface units 24, a second high-speed transmission side interface unit 21, and a second selector unit 23 are accommodated in the same arrangement as the first shelf. At this time, a circuit board 221 having a switching function in the switch section 22 in the first shelf 1 is arranged instead of the wiring board 121 arranged in the LTE system switch section.

A first shelf 1 'and a second shelf 2'
156 Mbit / s cable wiring transmission lines 32 and 33
By multiplexing and demultiplexing the signal input from the low-speed interface unit 14 or 24 to the first high-speed transmission interface unit 11 or the second high-speed transmission interface 21, We are building a compact ADM system with two shelves.

FIG. 3 shows an example of mounting such a shelf on a board.
And FIG. As described above, the same unit can be used for two types of operation modes by arranging a switch unit in the first shelf 1 with a wiring board connection or a switching circuit board according to a required system configuration. Becomes

With respect to the division of functional blocks into shelves and circuit boards in a conventional transmission apparatus, the background constituted by only the first shelf as in this embodiment is L
Along with the integration of SI, there is a half-board realization of the low-speed interface section due to a reduction in mounting area, and a division of the number of mounted boards into a plurality of shelves.

This will be described with reference to FIGS. The signal capacity of the high-speed interface unit is, for example, 2.4.
Gbit / s, and the signal capacity of the multiplexed low-speed interface board is 156 Mbit / s.
In order to multiplex 156 Mbit / s to 2.4 Gbit / s, a total of 32 boards must be accommodated in the low-speed interface unit in consideration of a redundant system. However, in actual operation of the device, the operation is not always performed with all the signal capacities that can be accommodated in the low-speed interface unit. In particular, many people use only a part of the signal capacity during the initial operation.

On the other hand, the number of low-speed interface boards that can be mounted on one shelf has been doubled because of the reduction in the mounting area due to the integration of the LSI, resulting in a half of the height of the other low-speed interface boards.

For this reason, in the present invention, the function is divided into a half-capacity of the low-speed interface unit and a selector unit, a switch unit, and a high-speed interface unit which are constituted by one shelf. In addition, it is possible to provide a system that allows for upgrade.

Although the above description has been made by taking N = 2 as an example, in general, only the first shelf is used, and the low-speed interface unit having a capacity of 1 / N of the high-speed interface capacity is used.
A function division in which the selector unit, the switch unit, and the high-speed interface unit are constituted by one shelf can be considered. This is also advantageous in terms of cost, particularly at the time of initial operation, and can provide a system in which upgrades are considered.

[Embodiment 2] Embodiment 1 of a method of upgrading a transmission apparatus according to a second embodiment of the present invention will be described with reference to FIGS. FIG. 8 illustrates an upgrade from a system in which transmission is performed in a basic LTE configuration in which station A and station B face each other point-to-point, to a three-station configuration including station A, station B, and station C. FIG. At this time, in addition to the first shelf 1 where station C is installed and station B operates as LTE, shelf 1 is upgraded.
A shelf 2 'having the same configuration as that described above is prepared, and a 156 Mbit / s cable wiring transmission line 3 shown in FIG.
The configuration connected by 2, 33 is adopted. Next, the first shelf 1
A circuit board 221 having a switching function in the switch section 22 is disposed instead of the wiring board 121 disposed in the switch section of the LTE system. In this way, an upgrade is realized by adding a shelf having the same configuration and replacing a circuit board. At this time, if the second shelf 2 is provided from the beginning, the upgrade can be performed only by replacing the board mounted on the switch unit.

That is, as described in the conventional example of FIG.
It is not necessary to add another LTE device to the B station to connect the low-speed interfaces back to back, and the signal only passes through the switch unit and the high-speed interface unit as shown in FIG. It does not involve the low-speed interface, and the reliability is increased accordingly.

This upgrade procedure is described in, for example, LTE
As described in the upgrade procedure from the system to the ADM system, as described above, the first shelf 1, the second shelf 2 used in the LTE system, and the cables 32 and 33 connecting the shelves are prepared. Then, a command for forcibly switching the switch unit having the redundant configuration is prepared. As a first procedure, the wiring board 121 of the first standby switch unit in the shelf is connected to the circuit board 221 having the switching function. Replacement,
A standby switch unit in the first shelf 1 and a second shelf 2
Cable 3 between the second high-speed side interface units 21
2 as a second procedure, using a forced switching command to switch the system replaced with the circuit board 221 having a switching function to the active system, and as a third procedure, the system of the standby system , The first shelf 1
The wiring board 121 of the internal spare switch unit is replaced with a circuit board 221 having a switching function,
By connecting the standby system switch unit in the first shelf 1 and the second high-speed interface unit 21 in the second shelf 2 of the standby system with a cable 32, the ADM is maintained in service. It is possible to upgrade to an operational form.

The phase matching in the device which occurs between two systems during the upgrade will be described with reference to FIG.
21 and 221, different logic values are added to the selector units 13 and 23 adjacent to the switch unit and the high-speed interface units 11 and 21 according to the mounting information signal from the logic. The wiring boards 121 and 221 can be identified, and the identification signals are used to select the selector sections 13 and 2 adjacent to the switch section.
3 and the selector circuits mounted on the high-speed interface units 11 and 21 are operated, and the first system device phase Φ1 and the second system device phase Φ2 of the two types of systems are mounted on the switch unit. By automatically switching just by inserting a wiring board, the required system phase can be matched.

Third Embodiment A third embodiment of the transmission apparatus according to the first embodiment of the present invention will be described with reference to FIGS. The third embodiment is an LTE system in which the signal capacity of the low-speed section is doubled by adding a second shelf 2 having the same arrangement as that of the first shelf from a compact LTE system constituted only by the first shelf 1. is there. FIGS. 1 and 3 show the first shelf 1 before the upgrade.
Alone shows the configuration of a compact LTE system.

This configuration will be described again with reference to FIG. 1. When several low-speed side interface units 14 and the first high-speed transmission side interface unit 11 are connected via the selector unit 13 and the switch unit 12 to the 156 Mbit / s back panel wiring transmission It is communicating on the road. Further, a wiring board 121 having only a pattern wiring is arranged between the selector section 13 and the first high-speed transmission side interface section 11 in the switch section 12.

FIG. 3 is a view for explaining a state in which the functional blocks of the transmission apparatus of FIG. 1 are inserted into the slots of the actual circuit board in the shelf. ing. FIG. 10 is a diagram for explaining a state in which a functional block of the LTE system in which the signal capacity of the low-speed part is doubled is inserted into an actual circuit board slot in a shelf. And

In FIG. 10, the low-speed interface board 241 of the required capacity in the second shelf 2 "is provided.
And the selector board 231 are added, and the added selector board 231 and the first shelf wiring board 121 are connected by a cable 33 (not shown) so that the capacity of the low-speed section is doubled. We are building a system.

As described above, depending on the type of service required, as a low-cost LTE system with only one shelf, or when the low-speed side capacity increases, the second shelf 2 is added and configured with two shelves. Both as an LTE system or as an ADM system in which the switch section is replaced with a switching circuit board 221 having an ADM function, the system can be changed in-service.

In the above device configuration, the wiring board 121 or the switching circuit board 22
1 and the input / output interfaces of the high-speed interface circuit boards 111 and 211 before multiplexing, the input / output interfaces of the selector unit boards 131 and 231 and the input / output interface speeds of the low-speed interface circuit boards 141 and 241.
By unifying with 155.52Mbit / s of 1,
It has a configuration that makes circuit board compatibility easy.

[0040]

As described above, when fully mounted, N
(N ≧ 2) In a transmission device configured with a shelf and applicable to two systems of LTE and ADM, a compact system can be operated with only the first shelf by adopting a split configuration like this system. Is possible, at this time
The main signal is cableless. In addition, depending on the request, a low-speed section can be provided by adding an n-th (2 ≦ n ≦ N) shelf having substantially the same configuration as the first shelf from a system that can be compactly configured only with the first shelf. Can be upgraded to a system that has doubled its capacity.

The same device can be used in two system forms only by interchangeably inserting a board required for service into the board of the switch section in the first shelf, and the system can be easily changed. Further, the change of the transmission system configuration can be changed from the first operation mode to the second
Can be upgraded.

[Brief description of the drawings]

FIG. 1 is a functional block diagram of a transmission apparatus according to a first embodiment when operating an LTE system.

FIG. 2 is a functional block diagram of the transmission apparatus according to the first embodiment when the ADM system is operated.

FIG. 3 is a diagram illustrating a circuit board mounted on a shelf when the transmission apparatus according to the first embodiment operates the LTE system.

FIG. 4 is a diagram illustrating a circuit board mounted on a shelf when the ADM system is operated by the transmission apparatus according to the first embodiment.

FIG. 5 is a diagram illustrating division of functional blocks into circuit boards in a conventional device.

FIG. 6 is a diagram illustrating a circuit board mounting arrangement on a shelf in a conventional device.

FIG. 7 is a diagram illustrating a conventional main upgrade using two LTE systems in a station building.

FIG. 8 is a diagram illustrating a method of upgrading the LTE system according to the second embodiment to the LADM.

FIG. 9 is a block diagram illustrating a system identification method according to a second embodiment.

FIG. 10 shows an LT in which the signal capacity on the low-speed side according to the third embodiment is increased.
FIG. 3 is a circuit board mounting layout of the E system.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... 1st shelf, 2 ... 2nd shelf which has the same structure as 1st shelf, 11 ... 1st high speed side interface part, 12 ... Switch part (at the time of LTE system), 13 ...
A selector section mounted on the first shelf, 14... A low-speed side interface section mounted on the first shelf, 15.
Common parts such as a monitoring control system and a clock system, 21... A second high-speed interface unit, 22... A switch unit (for an ADM system), 23... A selector unit mounted on the second shelf, and 24. Low-speed interface unit, 31 ... 156 Mbit / s back-panel wiring transmission line, 32 ... high-speed interface unit and switch unit (A
156 Mbit / s cable wiring transmission line for connecting the switch unit and the selector unit mounted on the second shelf, and 156 Mbit / s cable wiring transmission line for connecting the switch unit and the selector unit mounted on the second shelf. Interface section, 52: Switch section in conventional device division, 53: Selector section in conventional device division, 5
4: Low-speed interface unit in conventional device division;
55: a common part such as a monitoring control system and a clock system mounted on the high-speed shelf in the conventional device division; 56 ... a common unit such as a monitoring control system and a clock system mounted on the low-speed shelf in the conventional device division; 71: Multiplexing repeater (LT
E system), 72: optical cable input / output from low-speed interface board, 73: multiplexed high-speed optical transmission line,
81: Multiplexing repeater (LTE system) added at the time of upgrade, 82: Upgraded multiple repeater (ADM system), 91: Circuit board facing wiring board 121 in LTE system, 92
... A circuit board facing the switching board 221 in the ADM system, 93... A selector circuit, 111.
A first high-speed interface board, 121... A wiring board mounted on the switch unit in the LTE system, 131
... Selector board mounted on first shelf, 141
... Low-speed interface board mounted on the first shelf, 151... Common board for monitoring control system, clock system, etc., 211.
DESCRIPTION OF SYMBOLS 1 ... Board mounted in a switch part at the time of ADM system, 231 ... Selector board mounted in a 2nd shelf, 241 ... Low-speed side interface board mounted in a 2nd shelf, 501 ... High-speed shelf in the conventional apparatus division , 502... A low-speed shelf in the conventional device division; 521, a switching circuit board mounted on the switch unit in the conventional device division.

 ──────────────────────────────────────────────────続 き Continued from the front page (72) Inventor Tetsushi Nakano 216 Totsuka-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture

Claims (14)

[Claims] 1. A transmission device comprising N (N ≧ 2) shelves, wherein a low-speed interface unit, a selector unit, a switch unit, and a first high-speed interface unit are arranged in a first shelf. An n-th high-speed interface unit is mounted on n (2 ≦ n ≦ N) shelves, and the n-th high-speed interface unit and the switch unit of the first shelf are connected by n cables. A transmission device characterized by the above. 2. A transmission device comprising N (N ≧ 2) shelves, wherein a low-speed interface unit, a selector unit, a switch unit, and a first high-speed interface unit are arranged in the first shelf. A transmission device accommodating up to 1 / N of the capacity of a low-speed interface unit. 3. A selector section and a low-speed interface section are additionally mounted on the n-th (2 ≦ n ≦ N) shelf, and the selector section of the n-th shelf and the switch section of the first shelf are connected by a cable. 3. The transmission device according to claim 1, wherein the transmission device can be connected to form a system in which the number of interfaces of the low-speed interface unit is increased. 4. A switch unit is mounted on the n-th (2 ≦ n ≦ N) shelf, and the switch unit is connected to the switch unit of the (n−1) -th shelf by a cable, so that the switch capacity is n / (n− The transmission device according to claim 1 or 3, wherein the transmission device can be doubled. 5. An n-th (2 ≦ n ≦ N) shelf is connected to a first shelf.
The transmission device according to any one of claims 1, 3 and 4, wherein the same arrangement as that of the shelf is used. 6. An LTE wiring board having an identical circuit board tangent interface in a switch section, and an ADM.
In the case of an LTE system, an LTE wiring board is mounted on the switch unit, and in the case of an ADM system, the same device is mounted on the switch unit by installing two types of the same device. The transmission device according to claim 1, wherein the transmission device can be used in an operation mode. 7. A switch unit has a redundant configuration, and a command for forcibly switching the switch unit is prepared.
In a state where the first wiring board is mounted in both the working system and the standby system, as a first procedure, the first wiring board of the standby system switch unit is replaced with the second wiring board, As with the forced switch command,
The service of the second operation mode is started by switching the system replaced with the second wiring board to the active system. As a third procedure, the first wiring board of the system that has become the standby system is replaced with the first system. The transmission apparatus according to claim 1, wherein the transmission apparatus is upgraded to the second operation mode while being in service by replacing with the second wiring board. 8. At the time of upgrade, different logic values are added to the two types of wiring boards mounted on the switch section, and the boards adjacent to the switch section are mounted on the switch section by an information signal from the logic. The type of the two types of wiring boards can be identified, and the identification signal is used to operate the input phase selector circuit mounted on the board adjacent to the switch section, and the wiring board mounted on the switch section The transmission device according to claim 1, wherein a difference in input delay due to a difference between the input phases is absorbed to eliminate a malfunction due to a difference in input phase. 9. A plurality of low-speed interface units, a high-speed interface unit connected to a high-speed transmission line for multiplexing / demultiplexing, and a signal input from the low-speed interface unit connected to the high-speed interface unit in the same shelf. A transmission device comprising a selector unit and a switch unit, wherein the switch unit comprises a wiring board having a selection function and not having a switch function. 10. A first shelf, a first plurality of low-speed interface units, a high-speed interface unit connected to a high-speed transmission line to perform multiplexing / demultiplexing, and a signal input from the first low-speed interface unit. A first selector unit that connects the switch unit to the switch unit; and the switch unit. A second plurality of low-speed interface units, and a signal input from the second low-speed interface unit are provided in the second shelf. And a second selector unit connected to the switch unit, wherein the switch unit comprises a wiring board having a selection function and not having a switch function. 11. A first shelf, comprising: a first plurality of low-speed interface units; a first high-speed interface unit connected to a first high-speed transmission line to perform multiplexing / demultiplexing; A first selector unit that connects a signal input from the unit to a switch unit; and the switch unit. A second plurality of low-speed interface units, a second high-speed transmission path, A second high-speed interface unit that connects and performs multiplexing / demultiplexing; and a second selector unit that connects a signal input from the second low-speed interface unit to the switch unit. A transmission device comprising a circuit board having a switch function, wherein the first high-speed interface unit is also connected to the second high-speed interface unit. 12. A plurality of low-speed interface units, a high-speed interface unit connected to a high-speed transmission line to perform multiplexing / demultiplexing, a selector unit and a switch unit for connecting a signal input from the low-speed interface unit to the high-speed interface unit. The transmission device according to claim 1, wherein the switch unit comprises a detachable circuit board having a selection function. 13. The transmission device according to claim 12, wherein the high-speed interface unit and the selector unit recognize a logical value given to the circuit board. 14. A method of upgrading a transmission device having a redundant configuration, wherein (1) a wiring board having a selection function and not having a switch function of a spare switch unit of a first shelf has a switch function. Replacing the circuit board with a circuit board; (2) connecting the standby system switch unit of the first shelf to the second high-speed interface unit of the second shelf with a cable; and (3) switching the standby system to the active system (4) a step of replacing a wiring board having a selection function and not having a switch function of a switch unit which has become a standby system by switching the first shelf with a circuit board having a switch function; (5) a first step; Connecting the switch unit which has become the standby system by switching the shelf and the second high-speed interface unit of the second shelf with a cable. A method for upgrading from an LTE system to an ADM system.