JPS61285850A - Slot ring type communicating control system - Google Patents

Abstract

PURPOSE:To prevent the occurrence of the undue delay at the burst communication by selecting the reserved communicating mode and the burst communicating mode. CONSTITUTION:When a head flag is just detected by a communicating control device (PX)2-0 which comes to be a reserved mode, for example, when it is necessary to reserve two slots, two optional slots, which are not reserved on said head frame, are reserved like a slot 7. Thereafter, two respective slots are reserved on respective succeeding frames like the slot 7, and when the head frame flag is detected again, with the time point as a trigger, thereafter on the respective reserved slots 7, the data are mounted and transmitted. In the burst communicating mode, the slot is not reserved and idle, and then, instantaneously, said slot is grasped and the data can be mounted.

Description

[Detailed Description of the Invention] [Summary] In a slot-ring type communication control system, the structure is configured to clarify the beginning of frames existing on a network, and the necessary number of slots are reserved for each frame starting from the first frame. It is disclosed that a so-called reservation communication mode and a burst communication mode without reservation can be selected.

[Industrial application field]

The present invention is a slot ring type communication control system.

In particular, the present invention relates to a slot-ring type communication control system that allows a so-called slot-ring type communication system to select between a so-called reservation communication mode and a burst communication mode without reservation.

[Conventional technology]

Conventionally, as shown in FIG. 6, a monitoring device (SV) 1 and a plurality of communication control devices (PX) 2-0.2-1, . A communication system is known in which terminals 3-0.3-1, . . .

In such a communication system, the monitoring device 1 is as follows.

Frames are sent out onto the network 3 such that the network 3 is just filled with a plurality of frames. In response to a transmission request from a terminal connected to itself, one communication control device captures a slot on the frame, places the destination address, source address, transmission data, etc. in the slot, and It will be sent out.

In the slot ring type communication system as described above, slots are reserved in order to secure nine communication bands, and one of the multiple frames existing on the network is designated as a master frame, and the corresponding By reserving a predetermined number of slots in the master frame, similar reservations can be made in each subsequent frame. Then, when the slot reserved by the user comes around once, data is loaded into the slot.

[Problem that the invention seeks to solve]

Conventionally, the above-mentioned method has been known, but since the communication control device (P Put it away.

[Means for solving problems]

The present invention solves the above-mentioned problems and enables selection of a reserved communication mode and a burst communication mode. FIG. 1 shows an explanatory diagram of the principle of the present invention.

As shown in FIG. 1, the network 3 is filled with a plurality of frames (four frames in the illustrated case). In the illustrated case, the blacked-out 4 is the first frame flag, indicating that it is the first frame among four frames, the cross-hunted 5 is the subsequent frame flag, and the vertical line 6 is the first frame flag. The reserved slot 7 indicated by a diagonal line represents a newly reserved slot.

[Effect]

Assume now that the leading flag has just been detected by the communication control bag f(PX) 2-0, which is in the reservation mode, as shown in FIG. 1(a). At this time, for example, if it is necessary to reserve two slots, any two slots (which may be busy at that time) that are not reserved on the first frame are selected as shown in FIG. 1(b). Make a reservation like slot 7. Thereafter, as shown in FIG. 1(C), two slots, such as slot 7, are reserved on each subsequent frame, and when the first frame flag is detected again, this time is used as a trigger.

Thereafter, data is placed on each of the reserved slots 7 and transmitted.

The figure shows the communication mode in reserved communication mode, but
In the burst communication mode, if a slot is not reserved and is idle, the slot is configured to be immediately captured and loaded with data.

〔Example〕 FIG. 2 shows the configuration of one embodiment of the monitoring device.

In the figure, reference numeral 11 is a receiving circuit, 12 is a serial-to-parallel conversion circuit, 13 is a delay adjustment circuit for ensuring that multiple frames are just filled on the network, and 14 is a parallel-to-serial conversion circuit. , 15 is a transmitting circuit, 16 is a synchronizing circuit, 17 is a first frame flag adding circuit, and 18 is a frame generating circuit.

Further, FIG. 3 shows the configuration of one embodiment of the communication control device. In the figure, 21 is a receiving circuit, 22 is a serial-to-parallel conversion circuit, 23 is a branch circuit, 24 is an insertion circuit, 25 is a parallel-to-serial conversion circuit, 26 is a transmission circuit, 27 is a synchronization circuit, and 28 is a first frame converter. Flag detection circuit, 29
represents a reserved circuit.

Furthermore, FIG. 4 represents one embodiment formant of the frame. 30 in the figure is a frame, 31 is a flag, 3
2-0 to 32-n are slots, 33 is a control information area, 34 is a destination address, 35 is a source address, 36
37 represents a data area, 37 represents a reserve/free instruction bit area, and 38 represents a busy/idle instruction bit area.

The monitoring device 1 shown in FIG. 2 is used when starting up a transmission line.

Using the frame generation circuit 18 and the delay adjustment circuit 13.

The network 3 is filled with a plurality of frames 30 exactly. At this time, the first frame flag addition circuit 17 adds one of the generated frames.
Add the first frame flag to.

In this state, when one of the communication control devices (PX) enters the reservation communication mode, it detects the first frame flag and starts reservation, as shown in FIG. 1(a). At this time 1
Communication control equipment W (PX).

It is indicated how many slots to reserve per frame.

At this time, the first frame flag detection circuit 2 shown in FIG.
8 detects the first frame flag.

The reservation circuit 29 is activated. That is, a predetermined number of slots are reserved for each of the following frames, including the first frame. Then, when it has completed one round as shown in FIG. 1(C), the transmission data is placed on the slot 7 reserved by itself and transmitted.

Each frame has the format shown in FIG.

It may be considered that a first frame flag is placed at the position of the illustrated flag 31 in the first frame. And whether each slot is busy or idle is determined by
The determination is made based on the contents of bit 38.

Also, bit 3 indicates whether it is reserved or free.
It is determined based on the contents of 7.

FIG. 5 shows the control sequence of one embodiment of the reservation circuit.

The first frame flag is detected by the illustrated route (A). The illustrated route (B) corresponds to the case where the flag 31 of the frame is found but the desired slot cannot be reserved. The route (C) is.

This corresponds to the case where the found slot is not an unreserved slot, and corresponds to the case of searching for another slot 7). Route (D) corresponds to the case where a predetermined number of slots have not yet been reserved. Route (E) corresponds to reservation for subsequent frames. Route (F) corresponds to a state in which a predetermined number of slots are reserved for all frames.

〔Effect of the invention〕

As explained above, according to the present invention, a reserved communication mode is used when continuous and periodic transmission is required, such as when transmitting an audio signal, and a reserved communication mode is used when transmitting a voice signal, etc. It is possible to use communication that is performed without any communication.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the principle of the present invention, Fig. 2 is an embodiment of the configuration of a monitoring device, Fig. 3 is an embodiment of the configuration of a communication control device, and Fig. 4 is an illustration of the principle of the present invention.
The figure shows an example format of a frame. FIG. 5 shows an example control sequence of a reservation circuit, and FIG. 6 shows a general system configuration. In the figure, 1 is a monitoring device, 2 is a communication control device, 3 is a network, 17 is a first frame flag addition circuit, 18 is a frame generation circuit, 28 is a first frame flag detection circuit, 29 is a reservation circuit, and 37 is a reserve. /Free instruction bit area, 38 is busy/idle instruction Biff)? Represents the il area.

Claims (1)

[Claims] A monitoring device (1) and a communication control device (2-i) are connected to a ring-shaped network (3), and at least communication between terminals connected to the communication control device (2-i) is provided. During communication, a frame (30) is sent over the ring-shaped network (3).
slot (32-i) on frame (30).
), the monitoring device (1) generates the frames when starting up the transmission path and fills the network (3) with the frames. , the communication control device (2-i) is configured to have a function (17) for setting a first frame flag indicating the first frame in one of the generated frames, and the communication control device (2-i) has a first frame flag detection mechanism (28). ) and a slot reservation mechanism (29), which detects the first frame flag and all frames existing on the network (3) when slot reservation is instructed by a transmission request from the terminal. There is a burst communication mode in which a predetermined number of slots are reserved for each frame, and if the slot is idle, the corresponding slot is used for transmission. The frame (30) includes an area (31) for identifying a first frame flag and a subsequent frame flag, and an area (31) for identifying a first frame flag and a subsequent frame flag. A slot ring type communication control system characterized in that it is configured to have an area (37) for performing reservation control for each slot.