JPH025655A - Communication control equipment - Google Patents

Abstract

PURPOSE:To easily test the data error detecting function of a terminal by fetching the communication data between terminals to a communication data changing section in a central communication controller and arbitrarily setting an error in the communication data. CONSTITUTION:At the time of setting an error in the data on an optical loop transmission line by changing communication data between terminals 17 and 18, the communication data are fetched to the communication data changing section 19 of a central communication controller 11 through a light/electricity converting section 20, loop interface section 21, and time division multiplex bus 22. Then the time slot information performing the communication is obtained from a node controlling section 29 and the time slot information is outputted to the optical loop transmission line 14 after arbitrarily setting data of the time slot. Since the communication data changing section 19 can set arbitrary data in the communication data in such way, an error can be caused in the communication data on the optical loop transmission line and the data error detecting functions of the terminals can be checked easily.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a communication control device used in loop networks, exchange networks, and the like.

BACKGROUND OF THE INVENTION FIG. 3 shows the configuration of a loop type network system including a conventional communication control device.

In FIG. 3, one center communication decoration #1 and a plurality of local communication control devices 2, 3 are connected in a loop by an optical loop transmission line 4, and each local communication control device 2.3 When communicating between the terminals 7 and 8 connected via the terminal adapters 5 and 6, as shown in the sequence diagram of FIG. Then, the local communication control device 2 requests the center communication decoration #1 to allocate a time slot through the optical loop transmission line 4.

The center communication control device 1 allocates time slots,
A notification is sent to the local communication unit #2 through the optical loop transmission line 4. The local communication control device 2 that has received the notification of the time slot allocation makes a call to the terminal 8, and when the terminal 8 responds, the terminal 8 sends a response notification to the terminal 7. When terminal 7 receives the response notification, terminal 7 and terminal 8
A communication path is set up between them.

After the communication path is set, communication data between the terminals 7 and 8 is not imported into the center communication control device 1, and communication is performed only between the terminals 7 and 8.

Problems to be Solved by the Invention However, with the conventional communication control device described above, it is not possible to set errors for testing in the communication data on the optical loop transmission path that is exchanged between terminals, and data errors at the terminals cannot be set. There was a problem that it was difficult to confirm the detection function of .

The present invention is intended to solve such conventional problems, and aims to provide an excellent communication control device that can set errors in communication data on an optical loop transmission path.

Means for Solving the Problems In order to achieve the above object, the present invention provides a communication data modification method in which communication data taken into a center communication control device from an optical loop transmission line is arbitrarily changed and outputted to the optical loop transmission line. It is equipped with a section.

Therefore, according to the present invention, the communication data change section provided in the center communication control device arbitrarily changes the communication data taken in from the optical loop transmission line and outputs it to the optical loop transmission line. Errors can be set in the data on the loop transmission path, and the data error detection function of the communicating terminal can be easily confirmed.

Embodiment FIG. 1 shows the configuration of an embodiment of a network system including a communication control device of the present invention.

In FIG. 1, numeral 10 denotes a communication control unit, which is the same as the conventional center communication control device I. In FIG. 11 is a center communication control device of the present invention, 12.13 is a local communication control device, respectively,
14, the center communication control device 11 and the local communication control device, 12.13, and the local communication control device 12.
13 Optical loop transmission line connecting each other in a loop shape, 15
．． 16 are terminal adapters, 17 and 18 are terminals connected to the local communication control device 12 and 13 via the terminal adapters 15 and 16, respectively, and 19 is a communication data change unit provided in the center communication control device 11. can be,
This communication data changing unit 19 is as shown in FIG. 2, which will be described later.

It is connected to the time division multiplex bus 22 and has the function of arbitrarily changing data on the time slot in which communication is being performed.

FIG. 2 shows a schematic configuration of the center communication control device 11 of the present invention. Reference numeral 20 denotes an optical/electrical converter that takes in data on the optical loop transmission line 14 and converts it into an electrical signal.

Reference numeral 21 denotes a loop interface section which takes frame synchronization from the serial signal train flowing through the roof, converts it into 8-bit parallel data, and branches and inserts the data between it and the time division multiplex bus 22.

Reference numeral 23 denotes a time slot control section, which performs time slot exchange between the time division multiplex bus 22 and the communication path bus 24.

26 is a circuit switching control unit, and a control bus 25
It performs a transmission/reception control function for call connection control information to be exchanged with the subscriber circuit 30 via the subscriber circuit 30, a call connection process for performing terminal-to-terminal communication, and a communication path bus and time slot management for line connection.

The subscriber circuit 30 has a subscriber line interface circuit and performs subscriber status monitoring and connection control.

27 is a token access control unit that accesses the optical loop transmission line 14 and performs packet exchange with other communication control devices.

28 is a frame header control unit, and the center communication control device 11 is also a local communication control unit @12. 1
The monitoring control command information addressed to 3 and the status information addressed from the local communication control device 12.13 to the center communication control device 11 are sent and received via the loop interface 21 and processed. o-ru part 2
Exchange with 9.

The node control unit 29 monitors various states of the communication control device and system, handles failures, controls the system, and also manages time slots of the optical loop transmission line 14.

Next, the operation of the above embodiment will be explained. In the above embodiment, when communicating between the terminal I7 and the terminal 18, the terminal 17 sends a call to the local communication control device 12 through the terminal adapter 15, similar to the communication path setting procedure shown in the sequence diagram of FIG. local communication control device 1
2 requests the center communication control device 11 to allocate a time slot through the optical loop transmission line 14.

The time slot allocation request data is taken into the center communication control device 11 and sent to the node control section 2.
At 9, time slots are allocated, and the data is sent out onto the optical loop transmission line 14 and notified to the local communication control device 12.

The local communication control device 12 that has received the notification of the time slot allocation makes a call to the terminal 18, and when the terminal 18 responds, the terminal 18 sends a response notification to the terminal 17. When the terminal 17 receives the response notification, a communication path is established between the terminals 17 and 18.

When a communication path is set between the terminals 17 and 18, the communication data between the terminals 17 and 18 is exchanged only between the terminals 17 and 18 without being imported into the center communication control device 11. When changing the data on the optical loop transmission path and setting an error in the data on the optical loop transmission path, the communication data between the terminals 17 and 18 is changed to the communication data change unit 1 of the center communication control device 11.
9, an optical/electrical conversion section 20 and a loop interface section 21
, obtains the time slot information in which communication is being performed from the node control unit 29 via the time division multiplex bus 22, sets the data of that time slot arbitrarily, and transmits the optical loop via the same route as above. output on path 14.

In this way, according to the above embodiment, the communication data changing unit 19
By being able to set arbitrary data in the communication data, it is possible to eliminate errors in the communication data on the optical loop transmission path, and it is possible to easily check the data error detection function of the terminal.

Effects of the Invention As is clear from the above-mentioned embodiments, the present invention has the following feature: When a communication path is set between terminals and communication is in progress, the communication data between the terminals is changed to the communication data in the center communication control device. Since the configuration is such that errors can be arbitrarily set in the communication data by importing the data into the terminal, it has the advantage that the data error detection function of the terminal can be easily tested.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of a loop network system including a communication control device according to an embodiment of the present invention, FIG. 2 is a schematic block diagram of a communication control device of the present invention, and FIG. 3 is a conventional loop network system. System overview diagram, Part 4
The figure is a sequence diagram showing a procedure for setting communication paths between terminals. 10... Communication control unit, 11... Center communication control device,
12, 13... Local communication control device, 14... Optical loop transmission line, 15. 16... Terminal adapter, 17.
18...Terminal.

Claims (1)

[Claims] An interface unit that takes in signals on a loop transmission path and converts them between the signal format on the transmission path and the signal format inside the device, and monitors various statuses of the network system.
a node control unit that handles failure handling, time slot management of loop transmission paths, etc.; and a node control unit that arbitrarily changes communication data on a specified time slot among the communication data taken in from the interface unit under the control of the node control unit. , and a communication data changing unit that returns the communication data to the original time slot via the interface unit.