JPS6131663B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a facsimile storage and communication network that is highly expandable and economical.

As shown in Fig. 1, the storage processing device for facsimile storage and communication networks that has been involved in the past includes a line support section 1 that mainly controls terminals, and an image signal redundancy section that removes redundancy of image signals. A suppression unit 2, an image signal storage unit 3 that stores image signals on a page-by-page basis, and a communication processing unit 4 that analyzes the intention of a caller to transmit an image signal and transfers the image signal to a desired location are installed at the same location. was. In such a network, redundant signals are transmitted to the storage and processing unit, which increases the cost and limits the storage area, resulting in a small amount of traffic. The effect of using large-capacity disks could not be fully demonstrated, and the network as a whole was uneconomical.

In order to eliminate the above-mentioned drawbacks, the present invention has the following features:
The line handling section and the image signal redundancy suppression section are separated from the image signal storage section and the communication processing section, and the former is installed in a low-level traffic concentration section (for example, a single station or concentrated station level), and the traffic introduction section for the latter is installed. The aim is to construct a communication network in which the latter is installed at a high level (for example, at the central station or general office level) to handle large amounts of traffic, and to increase regional expandability and economic effects as a network. be.

This will be explained below with reference to the drawings.

FIG. 2 shows a communication network configuration according to the principles of the present invention. The line correspondence section 1 and the image signal redundancy suppressing section 2 are installed at a location apart from the image signal storage section 3 and the communication processing section 4, and are connected by one physical line 5. A call from the terminal 6 is first connected to the line handling section 1, and is checked through the communication processing section 4 to see if communication is possible. At this time, necessary control signals are transferred on the physical line 5. Next, if communication is possible, the image signal is sent from the terminal, redundancy is removed in the redundancy suppression section 2, and the image signal after redundancy suppression is also transferred through the physical line 5 and stored in the image signal storage section 3. Ru.

The above is the operation when transmitting an image signal from the terminal 6 to the communication network, but the operation when receiving an image signal from the communication network to the terminal 6 is almost the same. However, the check at the time of communication in the line handling section 1 is a check of the terminal status.

As described above, control signals and image signals are transferred on the physical line 5. The control signal has a short unit length, is extremely vulnerable to transmission code errors, and has a large delay time tolerance relative to the transfer time. The one-picture signal is exactly the opposite; it has a long unit length and has a certain degree of tolerance for code errors, but there are strict restrictions on the delay time. It is difficult to transfer signals with such conflicting characteristics through the same signal path, so in the physical line 5 shown in Fig. 2, the control signal channel and the image signal channel are separated into channels in a time-sharing manner. The format is such that a corresponding transmission time slot is secured. Furthermore, since the line handling section handles a plurality of lines on the physical line 5, terminal control signals and image signals can be multiplexed, making it possible to economize transfer costs.

By creating a facsimile communication network having the above configuration, the line support section 1 and the image signal redundancy suppression section 2 can be made into small-scale devices and can be installed in any area. The image signal storage section 3 and the communication processing section 4 can concentrate the amount of traffic by collecting the physical lines 5, and can use a large-capacity central processing unit, a large-capacity disk, etc., which is economical. If the physical line becomes long, the transmission cost becomes a problem, but this can also be made more economical because control signals and image signals can be multiplexed. In other words, the above-mentioned network allows regional expansion and economicalization of the network.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a storage processing device in a conventional facsimile storage and communication network, and FIG. 2 is a diagram showing a facsimile storage and communication network configuration according to the principles of the present invention. 1... Line correspondence section, 2... Image signal redundancy suppression section, 3... Image signal storage section, 4... Communication processing section, 5
...Physical line, 6...Terminal.

Claims (1)

[Claims] 1 In a facsimile storage and communication network consisting of a line handling unit that mainly controls terminals, an image signal redundancy suppression unit, an image signal storage unit, and a communication processing unit, the line handling unit and the image signal redundancy suppression unit are used to store image signals. When the image signal and the terminal and device control signals sent and received between them are transmitted using a digital path, a time slot corresponding to the signals is required. A facsimile storage communication network characterized in that a signal is fixedly determined, and when the signal is transmitted using an analog transmission path, a signal band corresponding to the signal is fixedly determined, and the signal is transferred over one physical transmission path.