JPH05244177A - Synchronization system - Google Patents

Abstract

PURPOSE:To synchronize an active side video display unit(VDU) with a standby side VDU in real time by providing a protocol and parallel transmission lines for synchronization. CONSTITUTION:This system consists of the active side VDU1, the standby side VDU2, an active side interface unit 3, a standby side interface unit 4, a switchover 5, and a parallel transmission line 6. In the case of changing the parameter at the active side VDU 1, the VDU1 discriminates whether himself is an active side or standby side by receiving the notification about that from the active side interface unit 3 and inputs the parameter first. The polling is performed between the active side VDU1 and the standby side VDU2 connected by the parallel transmission line 6. At that time the protocol is constituted of link establishment processing, data transmission processing, and polling processing, the parameter is made into a command just after the change of parameter and sent to the standby side VDU2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for synchronizing a parameter in a working spare when the parameter is converted in a satellite earth station supervisory controller having a working spare.

[0002]

2. Description of the Related Art Conventionally, there are the following methods for synchronizing parameters. (1) A method of copying a data file containing parameters from the active device to a floppy disk and delivering it to the standby device. (2) Connect the active device and the standby device with RS232C,
A method of transmitting data files serially. (3) A method in which the active side device and the standby side device are serially connected and the checksums of the two data files are compared, and the data files are transmitted if they are different.

[0003]

The above-mentioned conventional methods have the following problems, respectively. (1) In the method of copying the data file containing the parameters from the active side device to the floppy disk and passing it to the spare side device, the data file must be handed over to the spare side every time the parameters are converted, and the real time is required. I can't synchronize data. Also, it is not rational because copying must be done artificially. (2) Connect the active device and the standby device with RS232C,
In the method of transmitting the data file serially, it takes time to send the data in bit units. Also, the serial channel is limited and cannot be used when it is used for other communication.

(3) In the method of serially connecting the active side device and the standby side device and comparing the checksums of two data files, and transmitting the data files if they are different, the data files themselves are compared. Therefore, the data area in which the parameters are not converted is also compared, which increases the time. Further, if the data files are different, the entire data file itself is transmitted, which requires a great deal of processing time. An object of the present invention is to provide a synchronization method capable of synchronizing the working side and the protection side in real time.

[0005]

SUMMARY OF THE INVENTION According to the present invention, the active side device and the standby side device are connected by a parallel line and then the devices are polled. It is composed of a data transmission process and a polling process. Immediately after converting the parameter, the parameter is converted to a command and transmitted to the spare device.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a hardware configuration of a synchronous system at the time of a working standby configuration of the present invention, in which a working VDU (video display unit) 1, a backup VDU 2,
It is composed of a working side interface unit 3, a spare side interface unit 4, a switchover 5, and a parallel transmission line 6.

FIG. 2 is a block diagram showing the software configuration of FIG. 1. The active side has an active side monitoring task 7, an active side transmitting / receiving task 8, an active side parameter conversion task 9,
Working side data area 10 and working side I / O driver 1
It is composed of 6. Also, the backup side is the backup side monitoring task 1
1, spare side transmission / reception task 12, spare side parameter conversion task 13, spare side data area 14, data transmission line 1
5 and the spare I / O driver 17.

In the hardware configuration of FIG. 1, normal parameters can be changed only in the working VDU1. When changing the parameters on the active VDU1,
In hardware, the working VDU 1 receives a notification from the working interface unit 3 whether it is the working side or the protection side, and determines whether it is the working side or the protection side. First, enter the parameters. The changed parameter is transmitted as a command through the parallel transmission line 6 to the backup VDU 2 and is saved there.

In the software of FIG. 2, the transmitting / receiving task 8 always receives the working preliminary information from the monitoring task 7, and the information is also transmitted to the parameter converting task 9. In the parameter conversion task 9, based on the active spare information, when the user is currently in use, or when the user is spare, only when a parameter (command) is sent from the active side parameter conversion task 9, The parameters can be converted. In the current use, the parameters are changed by the parameter conversion task 9 and saved in the own data area.

The changed parameter is transmitted to the transmission / reception task 8 as a command immediately after conversion. Backup side VDU2
Before being transmitted to the I / O driver 16, the command is sent to the STX, ETX, BCC as shown in FIG.
Is added to the front and back, passes through the data transmission line 15, and is passed to the I / O driver 17 on the spare side to provide STX, ETX, BCC
Is sent to the transmission / reception task 12 on the spare side, and then passed to the parameter conversion task 13. In the parameter conversion task 13 on the spare side, since the monitoring task 11 has notified that it is a spare, the active side VDU1
Send the command data sent from to the data area and save it.

Next, the synchronization method (protocol) will be described. FIG. 4 is a diagram showing a protocol, which is separately written at the time of link establishment, data transmission, and polling.
The link establishing process is performed when the VDU is started up and when the working spare is changed due to the switchover. The primary station mentioned here is the working VDU, and the secondary station is the backup VDU. However, the active spare may switch during operation. In the normal protocol, the primary station transmits a link establishment request, and the secondary station receiving the request returns a link establishment response to the primary station. The primary station receiving the link establishment response sends a polling request, and the secondary station returns a polling response. Whether or not a checksum is required is added to the polling request, and the polling response includes the checksum for it (see FIG. 5). Further, the link establishment request is repeatedly made until the link is established. The time-out period can be changed freely.

At the time of data transmission, the data is 128 as shown in FIG.
It is divided into bytes so that it can be distinguished from the initial data, intermediate data, and final data. Primary station sends data 1
28 bytes are transmitted at a time, and the secondary station sends an OK response every 128 bytes. When the data has been transmitted, an end notification is transmitted, and the secondary station returns a polling response containing the checksum to the primary station. If the checksums match, the primary station transmits a store request and requests the secondary station to save the transmitted data. When the data is not normally transmitted to the secondary station, the same data is repeatedly transmitted. Three
If the response is NG or no response at all times, the link is established.

During polling, when the primary station is converting parameters, the polling request does not request a checksum. In response to this, the secondary station returns a polling response that does not include the checksum. If the primary station has not converted the parameters, it requests a checksum with a polling request. On the other hand, the secondary station returns a polling response including the checksum. If the polling response is not returned even after sending the polling request three times, it is determined that the link is broken, and the primary station starts from the link establishing process.

[0014]

As described above, the present invention has the following effects by providing a protocol and a parallel transmission line for synchronization. (1) Real-time synchronization can be established between the working VDU and the backup VDU. (2) Since the polling process is performed and the checksums of the two data files are compared in real time, no artificial process is required and the data of the two VDUs are equal. (3) Since the command is transmitted to the VDU of the other party when the parameter is changed, the two VDUs are always synchronized. (4) Since the data is transmitted in parallel, the transmission time is shorter than that in serial communication.

[Brief description of drawings]

FIG. 1 is a block diagram showing a hardware configuration of a synchronization system of the present invention.

FIG. 2 is a block diagram showing a software configuration of a synchronization system of the present invention.

FIG. 3 is a diagram showing a data format of transmission data.

FIG. 4 is a protocol diagram.

FIG. 5 is a data format diagram of a byte format.

[Explanation of symbols]

 1 Working side VDU 2 Standby side VDU 3 Working side interface unit 4 Standby side interface unit 5 Switchover 6 Parallel transmission line

Claims (1)

[Claims] 1. In a system in which the active side and the standby side are synchronized with each other when parameters are converted in an active standby satellite earth station supervisory controller, the devices are connected by a parallel transmission line and then polled between the devices. And a protocol at that time is composed of a link establishing process, a data transmitting process, and a polling process, and immediately after converting the parameter, the parameter is converted into a command and transmitted to the standby side device. ..