JPH05235911A - Transmitter of one to one active/standby configuration - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a transmission device capable of monitoring the operating state of each device at the master terminal side, and monitors the return signal of a regenerative repeater on either the active system or the standby system transmission line. It is an object of the present invention to provide a transmission device having a working / spare one-to-one configuration capable of being sent to a device. [Structure] A master terminal station 2, a slave terminal station 4, regenerative repeaters 31 and 32, and a monitoring device 1 which are connected by one working system transmission line WORK and one standby system transmission line PTCT. The monitoring device 1 sends a monitoring signal in parallel through the active system transmission line WORK and the standby system transmission line PTCT, and sends the operation status signals from the master terminal station 2, the regenerators 31, 32 and the slave terminal station 4 to the active system transmission path. WORK and standby transmission line P
Receive in parallel through TCT. In the slave terminal station 4,
A first switch SW1 for switching and receiving a supervisory signal sent through the active system transmission line WORK and the standby system transmission line PTCT, and an operating state signal of the slave terminal station 4 responsive to the supervisory signal are transmitted to the active system transmission line WORK or the standby system. Transmission line PT
It has a second switch SW2 that switches to CT and sends it out.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission device having a working / spare one-to-one configuration, and more particularly to a transmission device having a monitoring data link capable of monitoring the operating state of each device on the master terminal side.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a monitoring data link configuration of a conventional transmission apparatus having a working / spare 1: 1 configuration.

In FIG. 3A, the master terminal station 2 and the slave terminal station 4 are connected in a one-to-one configuration by one working system transmission line (WORK) and one standby system transmission line (PTCT). In the case of high-speed and high-capacity transmission, the working transmission path (WORK) and the protection transmission path (PTCT) are advantageously optical transmission paths.

Further, a regenerative repeater (REG) 3 is provided on the working transmission path (WORK) and the protection transmission path (PTCT). In the figure, one regenerator (RE
Although only G) 3 is shown, if the distance between the master terminal 2 and the slave terminal 4 is long, a plurality of regenerators (REG) 3 are provided as needed.

Reference numeral 1 is a monitoring device. The monitoring device 1 sequentially inquires each partner device of a transmission request by the polling method, collects the status information of the inquiries, and monitors the status of the entire transmission device.

Here, the one-to-one working / standby transmission apparatus ensures continuation of information transmission by switching to the standby system when there is a failure in the working system.

[0007] That is, once the active system becomes a failure, it is necessary to switch to the standby system within 50 mS in a certain system in order to continue the transmission with as little information as possible.

When the spare system that has been switched over is also in trouble, there is no point in switching to the spare system. For this reason, constant status monitoring by the monitoring device 1 is essential.

In the example of FIG. 3A, a common regenerative repeater (REG) 3 is used for the working / standby system.
Therefore, the working transmission path (WORK) and the protection transmission path (PTCT) are arranged relatively close to each other.

Therefore, considering the disconnection failure of the transmission line,
Working transmission line (WORK) and protection transmission line (PTC)
In many cases, T) becomes a disconnection obstacle at the same time. Therefore, neither the active system nor the backup system can be used, and the original function of the active system / the backup system cannot be utilized.

For this reason, there is an increasing demand for the regenerator (REG) to be separate from the working / standby system and to be installed in different locations. In response to such a request, an example of a possible transmission device is shown in FIG.

In comparison with FIG. 3A, the regenerator (R
EG) 3 is an independent regenerative repeater (R) for the active system.
EG) 31 and a regenerative repeater (REG) 32 for the standby system. As a result, the active transmission line (WOR
K) and the protection system transmission path (PTCT) are at the same time less likely to cause disconnection.

Next, the state monitoring will be described with reference to FIG.

The signals sent by the working transmission line (WORK) and the protection transmission line (PTCT) are composed of a data bit area and an overhead bit area.

The monitoring device 1 places a monitoring bit in the overhead bit area and transmits it. The monitoring bit includes the device number of the inquiry destination and the inquiry command.

As shown in the figure, the monitoring bit is sent in parallel to the working transmission line (WORK) and the protection transmission line (PTCT).

The master terminal 2, the regenerator (REG1,
The REG 2) 31, 32 and the slave terminal 4 have reply circuits 20, 310, 320 and 40, respectively.
Each of the devices 2, 31, 32, 4 includes a return circuit 20, 310,
At 320 and 40, the device number of the inquiry destination of the monitoring bit is compared with the own device number. If they match, the monitoring bit is extracted and received.

The slave terminal station 4 has a switch SW1 so as to switch and receive a signal from either the working or protection transmission path.

Return circuit 2 of each device 2, 31, 32, 4
0, 310, 320, 40 processes the monitoring bit addressed to the own device and returns an operation state signal. Slave terminal 4
From, a reply signal is sent in parallel to the working transmission line (WORK) and the protection transmission line (PTCT).

Regenerator (REG1, REG2) 31,
The reference numeral 32 has OR gates G2 and G3 for receiving a reply signal from the slave terminal station 4 and reply signals from the reply circuits 310 and 320 of the own device.

The master terminal 2 has a reply circuit 20 of its own device.
From the slave terminal station 4 and the regeneration repeater (R
It has an OR gate G1 that receives a reply signal from the EG1, REG2) 31, 32. A reply signal for notifying the status is sent to the monitoring circuit 1 through the OR gate G1.

Here, the reply signal of the reply circuit 20 of the master terminal station 2 is directly input to one input of the OR gate G1 provided in the master terminal station 2. On the other hand, OR Gate G
The other input of 1 is input through the switch SW2.

The switch SW2 is switched to either working or protection depending on the reception state. In particular, since the reply signal from the slave terminal station 4 is sent in parallel, collision may occur, and the reply signal may differ due to the difference in the lengths of the working transmission path (WORK) and the protection transmission path (PTCT). There may be a case of missing.

Therefore, it is necessary to selectively receive by the switch SW2 the reply signal that has passed through either the working transmission path (WORK) or the protection transmission path (PTCT).

[0025]

However, the switch SW
2 is a working transmission line (WORK) or a protection transmission line (P
When either one of the TCT) is switched and connected, the reply signal from one of the regenerators (REG1) 31 or (REG2) 32 cannot be received.

Therefore, it is an object of the present invention to solve the problem in such a conventional transmission apparatus that the reply signal from the regenerator cannot be sent to the monitoring apparatus 1 depending on the state of the switch SW2.

[0027]

FIG. 1 shows the principle of the present invention.

The master terminal station 2 and the slave terminal station 4 have one working transmission line (WORK) and one protection transmission line (PTC).
It is connected by T).

Regenerative repeaters (REG1, REG) are provided in the working transmission line (WORK) and the protection transmission line (PTCT).
2) 31 and 32 are provided, respectively.

The monitoring device 1 sequentially monitors the operating states of the master terminal station 2, the regeneration repeaters 31, 32 and the slave terminal station 4 by polling.

The monitoring device 1 uses the active transmission lines (WO
RK) and a protection system transmission line (PTCT). The reply signal which is the operation status signal from the master terminal station 2, the regenerators (REG1, REG2) 31, 32 and the slave terminal station 4 corresponding to this supervisory signal is sent to the working system transmission line (WORK) and the standby system transmission line (WORK). PTCT) and receive in parallel.

The slave terminal 4 is connected to the working transmission line (WOR).
K) and the first switch (SW1) for switching and receiving the supervisory signal sent through the protection transmission line (PTCT)
And a second switch (SW2) for switching a reply signal, which is an operation state signal of the slave terminal station 4 in response to the supervisory signal, to the working transmission line (WORK) or the protection transmission line (PTCT) and sending it out.

[0033]

The device of the present invention has the first switch (SW1) and the second switch (SW2) on the slave terminal station 4 side. Therefore, the reply signal from the slave terminal station 4 is
By the second switch (SW2), the active transmission line (WOR)
K) or the protection system transmission path (PTCT).

Therefore, the reply signal from the slave terminal station 4 has no possibility of collision. In addition, the active transmission line (WO
Since the reply signals from the regenerators (REG1, REG2) 31 and 32 of either the RK) or the protection system transmission path (PTCT) are received in parallel, the problem that they cannot be sent to the monitoring device is solved.

[0035]

EXAMPLE FIG. 2 shows an example of the present invention. The same or similar parts as those in FIGS. 1 and 3 are designated by the same reference numerals.

A master terminal 2 corresponding to the principle diagram of FIG.
The regenerators (REG1, REG2) 31, 32 have return circuits 20, 310, 320 and three-input OR gate G1, two-input OR gates G2 and G3, respectively.
Further, the slave terminal station 4 corresponding to the principle diagram of FIG. 1 includes a reply circuit 40, a first switch SW1 and a second switch S.
Have W2.

The signals sent by the working transmission line (WORK) and the protection transmission line (PTCT) are composed of a data bit area and an overhead bit area.

The monitoring device 1 places monitoring bits in the overhead bit area and transmits them in parallel to the working transmission path (WORK) and the protection transmission path (PTCT). This monitoring bit contains the device number of the inquiry destination and the inquiry command.

Master terminal station 2, regeneration repeater (REG1,
REG2) 31, 32 and the reply circuit 2 of the slave terminal station 4
0, 310, 320, and 40 compare the device number of the inquiry destination of the monitoring bit with the own device number.

As a result of the above comparison, when the device number of the inquiry destination of the monitoring bit and the own device number match, the return circuits 20, 310, 320 of the respective devices 2, 31, 32, 4
At 40, the monitoring bit is extracted and received. Each device 2, 3
1, 32, 4 reply circuits 20, 310, 320, 40
Processes the monitoring bits to create a reply signal.

Here, the return circuits 20, 310, 320 and 40 of each of the devices 2, 31, 32 and 4 may be composed of hardware circuits, or the same function may be obtained by software by a processing device including a CPU. ..

The slave terminal station 4 has a first switch SW1.
In addition, a signal from any one of the working (work) / spare (PTCT) transmission lines can be switched and received. In FIG. 2, the switch SW1 is the working transmission line (WOR
K). Therefore, the working transmission line (WOR
The monitoring bit from K) is sent to the reply circuit 40.

The reply signal, which is the operation status signal from the reply circuit 20 of the master terminal station 2, is input to the OR gate G1. Similarly, regenerators (REG1, REG2) 31, 3
The return signals, which are status signals from the second return circuits 310 and 320, are input to the OR gates G2 and G3, respectively.

On the other hand, the reply signal, which is the operation state signal from the reply circuit 40 of the slave terminal station 4, is the second switch SW.
It is led to the working transmission path (WORK) or the protection transmission path (PTCT) through the switch 2 depending on the state of the switch SW2.

In the example of FIG. 2, the switch SW2 is connected to the working transmission line (WORK). Therefore, the reply signal from the reply circuit 40 is sent to the working transmission line (WORK). Further, the reply signal sent to the working transmission line (WORK) passes through the OR gate G2 of the regenerator (REG1) 31 and is guided to the OR gate G1 of the master terminal station 2.

Here, the first switch SW1 in the slave terminal station 4 uses the working transmission line (WORK) or the protection transmission line (PT) depending on the error rate of the received signal.
The connection is switched depending on whether CT) is used.

On the other hand, the second switch SW2 is switched and connected by a message from the master terminal station 2.

In the above description, the active transmission line (WO
The case has been described in which the RK) and the protection transmission line (PTCT) each have one regenerator (REG1, REG2) 31 and 32, but the present invention is not limited to such a case. Depending on the distance between the master terminal station 2 and the slave terminal station 4, the required number of regenerative repeaters (REG1, REG2)
31, 32 are subordinately arranged.

[0049]

As described above, in the device of the present invention, as compared with the conventional device of FIG.
W2 is on the slave terminal station 4 side. Therefore, regardless of the state of this switch SW2, the active transmission line (WOR
It is possible to send the reply signal from the regenerators (REG1, REG2) 31 and 32 arranged on either side of the K) and the protection transmission line (PTCT) to the monitoring device 1.

At the same time, the reply signal from the slave terminal station 4 is sent to either the working transmission line (WORK) or the protection transmission line (PTCT) by the switch SW2, so that there is no possibility of collision.

[Brief description of drawings]

FIG. 1 shows the principle of the present invention.

FIG. 2 shows an embodiment of the present invention.

FIG. 3 shows an example of a conventional device.

[Explanation of symbols]

 1 Monitoring Device 2 Master Terminal 4 Slave Terminal 31, 32 Regenerative Repeater WORK Working Transmission Line PTCT Backup Transmission Line SW1 First Switch SW2 Second Switch

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H04L 29/14 25/60 8226-5K

Claims (1)

[Claims] 1. A master terminal station (2) and a slave terminal station (4) connected by one working system transmission line (WORK) and one protection system transmission line (PTCT), and the working system transmission line (WORK). ) And a backup transmission line (PTC)
Regenerators (31, 32) provided respectively in T)
And a monitoring device (1) for sequentially monitoring the operating states of the master terminal station (2), the regenerators (31, 32) and the slave terminal station (4) by polling. , In parallel, the active transmission line (WOR
K) and a protection system transmission line (PTCT) to send a supervisory signal, and an operation status signal from the master terminal station (2), regenerators (31, 32) and slave terminal station (4) corresponding to the supervisory signal In parallel through the working system transmission line (WORK) and the protection system transmission line (PTCT), and the slave terminal station (4) receives the working system transmission line (WORK).
K) and the first switch (SW1) for switching and receiving the supervisory signal sent through the protection transmission line (PTCT)
And a second switch (SW2) for switching the operation status signal of the slave terminal station (4) responding to the supervisory signal to the working transmission path (WORK) or the protection transmission path (PTCT). Active / spare 1 to 1 characterized by
Configuration transmission device.