JPS6399649A - Circular communication network - Google Patents

Abstract

PURPOSE:To improve the availability of the construction of a communication network by giving the delay quantity of a data signal which occurs through internal delay in a subterminal equipment to a clock signal and a synchronizing signal so as to be corrected and transmitting it to a main terminal equipment. CONSTITUTION:A central unit 1 and plural terminal equipments 2 which take in terminal equipment 5 through a line 4 to control lines are connected in a loop with a main line 3 for time division multiplex transmission and the plural terminal equipments 2 are respectively constituted with the main terminal equipment 2 connected to the main line 3 and plural subterminal equipments 22a-22c which are taken in the main terminal equipment 21 through a loop-shaped sub main line 23. The subterminal equipments 22a actuates with the data signal and the timing signal transmitted from the main terminal equipment 21 and corrects the timing signal by the delay time of the data signal to the next subterminal equipment 22b through the internal delay so as to transmit. In the subterminal equipments 22b and 22c the correction is executed in the same way and when the data signal and the timing signal are transmitted to the main terminal equipment 21 from the subterminal equipment 22c, the main terminal equipment 21 controls the data signal with the timing signal received from the subterminal equipment 22c.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a circular communication network in which a central device and a plurality of terminal devices are connected in a circular manner by a trunk line.

[Conventional technology]

Conventionally, in this type of ring communication network, a data signal sent from a main terminal device to a sub-terminal device returns to the main terminal device with an internal delay in the sub-terminal device. The sub-terminal device applies a correction delay to the data signal so as to match a fixed delay time (fixed delay time) defined in advance by the main terminal device, and sends the data signal to the main terminal device.

FIG. 5 shows this operating state.

[Problem that the invention seeks to solve]

However, in such a ring communication network, when multiple sub-terminal devices are connected in series to a main terminal device, control is required to change the fixed delay time according to the number of sub-terminal devices. , lack of flexibility in building communication networks.

[Means for solving problems]

The ring communication network of the present invention connects a central device that controls the entire communication network and a plurality of terminal devices that accommodate terminal devices and control the lines via a line through a main line of time division multiplex transmission. , each of the plurality of terminal station devices is constituted by a main terminal station device connected to the main trunk line and a plurality of sub terminal station devices accommodated in the main terminal station device via a ring-shaped sub trunk line; Each of the plurality of sub-terminal devices applies a delay of the data signal caused by an internal delay to a clock signal and a synchronization signal to delay the data signal and send the delayed data signal to the sub-main line;
It is characterized in that control is performed to match the phases of a clock signal and a synchronization signal, and the main terminal station device synchronizes with the clock signal and synchronization signal received via the sub-main line and controls the data signal.

[Example] Next, an example of the present invention will be described with reference to the drawings.

Referring to FIG. 1, a ring communication network according to an embodiment of the present invention includes a central device 1 that controls the entire communication network, and a line 4.
It is constructed by connecting a plurality of terminal devices 2 through which terminal devices 5 (data terminals, computers, etc.) are accommodated and which perform line control via a circular time division multiplex transmission line (main line) 3.

Next, referring to FIG. 2 showing the detailed configuration of the central device 1, the central device 1 includes a reception and transmission synchronization section 111 and a transmission and transmission synchronization section 1]2. The reception and transmission synchronization unit 111 is connected to the main line 3, receives signals from the main line 3, performs reception and transmission control such as clock signal extraction and data signal decoding, and performs reception synchronization using a synchronization pattern of time-division multiplexed data signals. A data signal 131 for controlling and sending to the sub trunk line 13. A clock signal 132 and a synchronization signal 133 are created. The transmission transmission synchronization unit 112 receives the data signal 131 . Clock signal 132 and synchronization signal 13
3, performs synchronization using the clock signal 132 and the synchronization signal 133 to generate a synchronization pattern, performs transmission synchronization control to convert the data signal [3] into time division multiplexed data, encodes the data signal 131, and generates a synchronization pattern. Performs transmission transmission control for transmission to the main line 3. Further, the central device 1 includes a loop synchronization control section 110 connected to a reception transmission synchronization section 111 and a transmission transmission synchronization section 112 via a sub-main line 13.

The loop synchronization control section 110 generates a clock signal (main clock signal) 132 and a synchronization signal (main synchronization signal) 133.
is created and sent to the transmission synchronization unit 112 via the sub-main line 13.

Further, data signals 131 . Clock signal 132 and synchronization signal 13
3, performs a loop synchronization control section that delays the data signal 131 in synchronization with the main clock signal 132 and the main synchronization signal 133, and sends the data signal 131 to the transmission synchronization section 112.

Next, the detailed configuration of the terminal device 2 will be described with reference to FIG.
11 and a transmission synchronization section 212. The reception and transmission synchronization unit 211 is connected to the main line 3, receives signals from the main line 3, performs reception and transmission control such as clock signal extraction and data signal decoding, and performs reception synchronization using a synchronization pattern of time-division multiplexed data signals. control and data signal 231. A clock signal 232 and a synchronization signal 233 are created and sent to the sub-main line 23. Transmission transmission synchronization unit 212
are the data signal 231 from the sub-main line 23 and the clock signal 2
32 and synchronization signal 233, performs synchronization using clock signal 232 and synchronization signal 233 to generate a synchronization pattern, performs transmission synchronization control to convert data signal 231 into time division multiplexed data, and encodes data signal 231. It performs transmission transmission control for converting the data to the main line 3 and transmitting it to the main trunk line 3. Furthermore, the terminal device 2 has a plurality of sub-terminal devices 22a, 22b, 22
Equipped with c. These sub-terminal devices are sequentially connected via the sub-main line 23 to form a sub-loop to the main terminal device 21. Sub-terminal device 22a.

22b and 22c each include a line connection section 221 and a synchronization correction section 222. The line connection unit 221 receives the data signal 231 . It receives a clock signal 232 and a synchronization signal 233, extracts a data signal from a specific channel of the time-separated channel, and sends this data signal to line 4. Further, the line connection unit 221 inserts the data signal from the line 4 into a specific channel, creates a time-division multiplexed data signal 231, and sends the data signal 231 to the next sub-trunk line 23. The synchronization correction unit 222 receives a clock signal 232 and a synchronization signal 233 from the sub-main line 23 and adjusts the synchronization correction unit 222 to the line connection unit 2
In this way, the sub-terminal device 22a controls the clock signal 232 and the synchronization signal 233 to have a delay equivalent to the delay time of the sending data signal 231 that occurred in the main terminal station 21, and sends them to the next sub-main line 23. It operates based on the data signal and timing signal (clock signal and synchronization signal) sent from the device 21, and corrects the timing signal according to the delay time of the data signal to the next sub-terminal device 221) due to internal delay. Send. sub-terminal device 22b,
Similar correction is performed in 22c, and the sub-terminal device 22
When a data signal and a timing signal are sent from c to the main terminal device 21, the main terminal device 21 controls the data signal based on the timing signal received from the sub-terminal device 22c.

As a result, the main terminal device 21. is multiple sub-terminal equipment N22
It becomes possible to control data signals without being aware of the delay caused by passing through a, 22+:), and 22c. This operating state is shown in FIG.

〔Effect of the invention〕

As explained above, according to the present invention, a plurality of sub-terminal devices constituting a terminal device connected in a ring to a central device via a main trunk line are connected in a circular manner to a main terminal device via a sub-trunk line. The main terminal equipment connects to the secondary terminal equipment, corrects the clock signal and synchronization signal by applying the delay of the data signal caused by the internal delay in each secondary terminal equipment, and sends it to the main terminal equipment. Data signals can be processed by performing synchronization based on the clock signal and synchronization signal received from the device. As a result, it is possible to accommodate any plurality of sub-terminal devices in the main terminal device, providing flexibility in constructing a communication network.

[Brief explanation of the drawing]

FIG. 1, FIG. 2, FIG. 3, and FIG. 4 are diagrams showing one embodiment of the present invention, and FIG. 5 is a diagram explaining the prior art.

Claims (1)

[Claims] A central device that controls the entire communication network and a plurality of terminal devices that accommodate terminal devices and control the lines are connected in a ring by a main line of time division multiplex transmission, and the plurality of terminal devices each of which is composed of a main terminal station device connected to the main trunk line and a plurality of sub-terminal station devices accommodated in the main terminal station device via a circular sub-main line, and each of the plurality of sub-terminal station devices Each of them performs control to delay the data signal, clock signal, and synchronization signal by applying a delay of the data signal caused by internal delay to the clock signal and the synchronization signal, and to match the phases of the data signal, clock signal, and synchronization signal sent to the sub-main line, and the main terminal station device. The ring communication network is characterized in that the data signal is controlled by synchronizing with a clock signal and a synchronization signal received via the sub-main line.