JPH03220847A - One-way operation system for communication line - Google Patents

Abstract

PURPOSE:To avoid the state of invalid holding such as acquisition of a communication line not in use and to utilize a communication line effectively by operating and managing digital communication lines of broad band for picture exchange of the like individually in terms of incoming and outgoing. lines when the connection is implemented via a common line signal so. CONSTITUTION:In the case of one-way communication after the connection request, the communication direction is from A station 2 to a B station 6, then only an outgoing communication line 4 is acquired. Then an opposite station start signal (IAM) being a common line signal added with communication kind information representing one-way communication is sent to the B station 6 being an opposite station. The B station 6 sets an outgoing line 4 in busy state to proceed the call processing.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a switching network using a broadband digital communication line such as image exchange, and in particular, when connecting a call via a common line signal, it is possible to reduce the use of communication line resources. This paper relates to a one-way operation method for communication lines for effective use.

[Conventional technology]

Conventionally, this type of communication line operation method operated and managed two communication lines on the upper and lower sides as one 9-element service, or used only one of the communication lines on the upper and lower sides. In this case, when a connection request was made, two communication lines, one for uplink and one for downlink, were captured and one of the communication lines was used.

[Problem to be solved by the invention] The conventional communication line operation method described above operates and manages two communication lines, upstream and downstream, as one element, so even if a one-way communication service occurs, , seizes the other unused communication line and holds it invalid. Moreover, if a failure occurs in only one communication line, the other communication line is blocked and communication becomes impossible even though the other communication line is normal.

[Means to solve the problem]

The unidirectional communication line operation method according to the present invention has the function of operating and managing the two communication lines on the upper and lower sides as separate elements, and the type of connection (unidirectional/ (bidirectional), a function to capture and memorize the paired communication line during bidirectional communication, and a function to determine the connection type (unidirectional/bidirectional) and paired line information (bidirectional communication). It also has a function to notify the other station of the

[For production]

According to the present invention, there is no invalidation pending state in which unused communication lines are captured, and communication lines can be used effectively.

- [Embodiment] Fig. 1 is a connection configuration diagram when an embodiment of the unidirectional operation method for communication lines according to the present invention is applied to a central office line.

In the same figure, 1 is the A-station communication path device, 2 is the A-station accommodated in this A-station communication path device 1, 3 is the uplink communication line as seen from this A-station, and 4 is the lower 9 communication as seen from the A-station. The line, 5 is a B-station communication path device, and 6 is a B-station accommodated in this B-station communication path device 5.

Next, the operation of the unidirectional operation system of the communication line with the above configuration will be explained with reference to FIG. First, a case will be explained in which, for example, a subscriber of station A 2 sends an image to a subscriber of station 8 6 by one-way communication.

After making a connection request in step 81, step S2
It is determined that the communication is one-way. Then, in step S3, since the communication direction is from A station 2 to A8 station 6, after determining the transmission state, only the lower communication 4 is captured in step S85. Then, in step S7, a partner station activation signal (IAM), which is a common channel signal to which communication type information indicating that communication is one-way communication is added, is sent to the eight partner stations 6. At step S9, station 8 sets a4 to busy 979 times based on the information and continues call processing. Also, if the subscriber of station A 2 and the subscriber of station 8 6 want to have a one-to-one conference, the communication will be bidirectional, so after determining that it is bidirectional communication in step S2, 3 button of communication line and down communication line 4 are captured. Then, in step S8, the upper communication time @3
button, and sends an IAM signal to station B, which is the other station, with information that it is bidirectional communication and information that the paired line is the lower communication line 4. For this reason, step S
At 9, the 8th station 6 can set the uplink communication line 3 and the downlink communication line 4 to busy based on the information, and continue call processing.

〔Effect of the invention〕

As explained in detail above, according to the method of simultaneously operating one side of the communication line according to the present invention, when connecting via a common line signal, the broadband digital communication line for image exchange etc. is operated separately on the upper and lower sides. By managing the operation, it is possible to eliminate the invalidation suspension letter tIl that captures communication lines that are not in use, and to make effective use of communication lines.

Furthermore, there are effects such as the number of communication lines can be reduced because there are no lines that are held invalid.

[Brief explanation of drawings]

Fig. 1 is a connection configuration diagram when an embodiment of the communication line unidirectional operation method according to the present invention is applied to a central office line, and Fig. 2 is a flow of connection processing to explain the operation of Fig. 1. FIG. 1...A station communication path device, 2...A station, 3...
・Upward communication line, 4... Downward communication line, 5...
B station communication path device, 6... B station. 12th

Claims (1)

[Claims] In a switching network system that has broadband digital communication lines such as image exchange and connects via common line signals, there is a function to operate and manage the two upstream and downstream communication lines as separate elements, and common line signals. A unidirectional operation method for a communication line, characterized by having a function of adding paired line information as an additional parameter to a partner station activation signal (IAM).