JPS62166634A - System for setting address of terminal equipment in two-way catv system - Google Patents

Abstract

PURPOSE:To reduce the man-hour and time required when the address of a terminal equipment is reset, by providing physical addresses peculiar to each terminal equipment and logical addresses set by a controller and selectively using one of these addresses. CONSTITUTION:A logical ID number signal is transmitted from a controller 1 by using the physical ID number signal of a terminal equipment 4 as an address. Upon receiving the logical ID number signal, said terminal equipment 4 stores the received signal in a memory as a logical address and, simultaneously, transmits an ACK signal indicating that normal reception is performed to the controller 1. After receiving the ACK signal the controller 1 stores the physical ID number signal and logical ID number signal in a memory device composed of a memory, disk, etc., as physical address and logical address, respectively. Therefore, the correspondence between the controller 1 and terminal equipment 4 is set in two kinds of addresses, physical address and logical address.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a terminal device address setting method in a bidirectional CATV system applied to a CATV station operation management system, a Baum converter, and the like.

<Prior art> Bidirectional CATV systems conventionally applied to C'ATV station operation management systems, Baum converters, etc.
It is common to perform data transmission between one control device and multiple terminal devices based on a polling/selecting method. The address of each terminal device connected by the CATV line is set as a unique physical address by an address setting switch. Then, in the control device, the physical address of the terminal device is read out and stored in a storage device such as a memory or a disk.

When attempting to control data transmission in such a system, the control device first sets the physical address of the terminal device it wants to access in a transmission frame and transmits it, and the terminal device then transmits the transmitted frame. Determine whether the physical address is equal to its own physical address,
If they are equal, set its own physical address in the frame sent from the terminal device and send ill with the necessary data.
Send to m@. In this way, it is possible to transmit not only signals from the control device but also signals from the designated terminal device.

<Problems to be Solved by the Invention> In the above system, the physical address of each terminal device remains fixed, so for example, in order to improve system maintenance efficiency, it is necessary to manage terminal devices with consecutive physical addresses. When attempting to do so, or when installing or removing a new terminal device, it is necessary to reconfigure the physical addresses of all or some of the terminal devices using the address setting switch, which requires a great deal of effort and time. The problem is that it requires

In particular, recently, large-scale bidirectional CATV systems with a large number of terminal devices have become available, and such systems require an unacceptable amount of effort and time. There has been a strong need for a terminal device address setting method that can save these efforts and time.

<Object of the invention> This invention was made in view of the above problems,
It is an object of the present invention to provide a terminal device address setting method in a two-way CATV system that can reduce the labor and time when resetting the address of a terminal device.

Means for Solving Problems> In order to achieve the above object, the terminal device address setting method of the present invention has a physical address unique to each terminal device and a logical address set by the control device. However, either address can be used selectively.

However, both the physical address and the logical address may be held by a storage device, or the physical address may be held by an address setting switch, and the logical address may be held by a storage device.

As the storage device, a memory, a disk, etc. can be used.

<Operation> With the terminal device address setting method described above, signals can be exchanged between one control device and multiple terminal devices through a signal transmission path based on the polling/selecting method. In the two-way CATV system,
A unique physical address is set for each terminal installed, and a logical address is set for each terminal device by the above control device, so you can selectively use any address. , designation of a terminal device, and transmission of an address and data from the terminal device.

When both the physical address and the logical address are held in a storage device, an address setting switch becomes unnecessary, and the terminal device can be made smaller.

In addition, if the physical address is to be held by an address setting switch and the logical address is to be held by a storage device, the physical address can be set by the address setting switch in the same way as with conventional terminal devices, and the logical address can be held by the storage device. You can also set the address.

<Example> Hereinafter, embodiments will be described in detail with reference to the accompanying drawings showing examples.

FIG. 3 is a block diagram, not showing an embodiment, of the configuration of a bidirectional CATV system that implements the terminal device address setting method of the present invention. (2) and a head end device (3), a plurality of terminal devices (4) are connected.

FIG. 1 is a diagram showing the data format of signals exchanged between the control device (1) and the terminal device (4), including synchronization character data (5), data byte number data (6), control data (Sword, 10 number data (8), text data (9), and BCC data (
(to).

To explain in more detail, the above synchronization character data (
5) indicates the beginning of the transmission frame, for example,
As shown in Fig. 2A, it is composed of 5 consecutive characters consisting of 7E''.
) is the above control data (sword to text data (
This shows the number of characters up to 9) in 1-byte binary. The above control data (the sword is shown in Figure 2 BSC)
, and D, it consists of a 3-bit control code for distinguishing between polling and selecting, and a 5-bit data classification code for indicating the type of text data (9). As shown in FIG. 2E, the ID number data (8) consists of a 10 number flag indicating the type of ID number and ID signal data, and is 4 bytes in total. The above text data (9) is actual transmission/reception data, and has a maximum length of 250 bytes. Above B
CC data 00) is a 1-byte checknum used to determine whether or not the data at the time of transmission and reception is valid, and when transmitting, each data from control data (sword to text data (9)) is added. However, the least significant byte of the two's complement number is set, and upon reception, the validity of the data is determined depending on whether the result of adding each data from control data ('7) to BCC data (10) is 7. can be determined.

The operation of the above two-way CATV system is as follows.

If a new terminal device (4) is installed, please refer to Figure 4A.
In the path shown in middle a, the logical 1 is sent from the control device (1) to the physical 10 number signal of the terminal device (4) as an address.
Send 0 number signal. Then, the terminal device (4) that has received this logical ID number signal stores the received logical ID number signal as a logical address in its memory, and at the same time sends it to the control device (1) as shown in the figure. Depending on the route,
An ACK signal indicating that normal reception has been performed is transmitted. Upon receiving this ACK signal, the control device (1) sends a physical ID number signal to a storage device consisting of a memory, a disk, etc.
and a logical ID number signal are stored as a physical address and a logical address, respectively.

Through the above series of operations, the control device (1) and the terminal device (
4) is set in two types: physical addresses and logical addresses.

When performing normal polling/selecting operations, the terminal device (4) that the control device (1) wants to access must be connected to the terminal device (4). I! Set the ID number signal as a logical address,
The command signal is transmitted through a route not shown as a in FIG. 4B.

Then, in each terminal device (4), the logical ID number signal is compared with the logical ID number signal stored in the memory, and if it is determined that they are equal, the logical ID number signal is stored in the memory of the terminal device (4). The logical ID number signal shown in FIG.

If the terminal device (4) is removed, the control device (1)
For the terminal device (4) scheduled to be removed from
By the route shown in , the object Fl! Using the 10 number signal as a physical address, logical ID number setting information (setting information indicating that the logical ID number signal should be O) is transmitted. and,
This theory]! [! The terminal device (4) that has received the ID number setting information sends an AC signal indicating that normal reception has been performed to the control device (1) via the route already shown in the figure.
The function is stopped until the K signal is transmitted and the logical ID number information (ID number information other than O) is received again from the control device (1). The control device (1) that received this ACK signal
) is a physical ID for storage devices consisting of memory, disks, etc.
A number signal and a logical ID number signal (logical ID number signal of O) are stored as a physical address and a logical address, respectively. Therefore, it is possible to easily identify that the terminal device δ(4) in which O is stored as the logical address has been removed.

Note that this invention is not limited to the above embodiments (
, for example, normal polling/1? It is possible to use a logical 10 number signal instead of a physical ID number signal as an address when performing a rectifying operation and a terminal device removal operation, and various other methods can be used without changing the gist of the present invention. It is possible to make design changes.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the data format of the signal, FIG. 2 is a diagram showing each part of the signal in detail, and FIG. 3 is an example of the configuration of a bidirectional 0ATV system implementing the terminal device address setting method of the present invention. FIG. 4 is a block diagram showing the operation. (1)...Control device, (4)...Terminal device Patent applicant: Sumitomo Electric Industries, Ltd. Figure 1') b '7 15
Day 1U Fig. 2 (B) (A) (D) (E) 76543210 Bit 755d, '4910 Bit shu T 竺Sui ``2izu[□ ``--1- 12k ``F,'-'''4-"""-

Claims (1)

[Claims] 1. One control device and multiple terminal devices Polling/selecting method between Sending and receiving signals through signal transmission lines based on formulas Two-way CATV that allows In the system, things specific to each terminal device Set by the physical address and the control device above. logical address, and selectively Characterized by using any address In a two-way CATV system with Terminal device address setting method. 2. Physical address and logical address Both of the above are held in a storage device. Bidirectional CA according to claim 1 Terminal device address in TV system Setting method. 3. Address setting switch for physical address The logical address is stored by the storage device. The above patent claims held by each Bidirectional CATV system described in scope 1 Terminal device address setting method in system.