JPS5835420B2 - Packet switched data highway system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a packet-switched data highway system, and more particularly to a packet-switched data highway system in which a plurality of communication devices and at least one monitoring device are connected in a loop by a data highway. In the system,
The present invention relates to a packet-switched data highway system in which at least the monitoring device collects management information by comparing the contents of packet information circulating on the highway with a predetermined bit pattern.

Conventionally, in a packet-switched data highway system, a plurality of communication devices are connected in a loop by a highway, and packet information or frame information is circulated on the highway.

In such a data highway system,
The packet information or frame information includes address information indicating a source station address and a receiving station address, and control information indicating whether communication is in progress.

Focusing on the above points, the present invention provides management information used in system operation, such as (i) communication volume, (i:) loop usage efficiency, (iii) busy probability, (iψ concentration rate, M
By extracting the optimal retransmission time interval, etc. at all times or at any time, ■Future system expansion, (B) Improving usage efficiency,
(C) The purpose is to make it usable for preventive maintenance of failures.

Therefore, in the packet-switched data highway system of the present invention, a plurality of communication devices and at least one monitoring device are connected in a loop through a data highway, and the packet-switched data highway system is configured such that a plurality of communication devices and at least one monitoring device are connected in a loop shape, and a plurality of communication devices and/or monitoring devices transmit data from the communication device and/or the monitoring device. In a packet-switched data highway system in which the packet information is received by another communication device and/or a monitoring device while the packet information travels around the data highway, at least the monitoring device receives the packet information passing through the monitoring device. For information, extract at least the contents of an address field and/or the contents of a control field in the packet information, detect a match between the contents and a predetermined bit pattern, and count the number of times. It is characterized by being configured.

This will be explained below with reference to the drawings. FIG. 1 shows a system according to an embodiment of the present invention, and FIG. 2A shows a system according to an embodiment of the present invention.

B shows one embodiment of frame information circulating on the data highway, and FIG. 3 shows one embodiment of the configuration of a monitoring device.

In FIG. 1, 1 represents a monitoring device, 2-1 to 2-4 each communication device, and 3 a data highway.

Note that the monitoring device 1 is connected to the communication device 2-1 or 2-2.
-4 may be prepared as a specific device, or one or more of the plurality of communication devices may function as a monitoring device.

On the data highway 5 shown in FIG. 1, there is a bit pattern F indicating the beginning of the frame as shown in FIG. 2A.
As shown in Figure 2 (0), frame information starting from the bit pattern F indicating the beginning of the frame, that is, frame information consisting of one or more packet information, circulates bit serially. It will be done like this.

In the frame information or packet information shown in FIG. 2, address information indicating the receiving station (transmission destination) is set in the A1 field, and the transmitting station (transmission destination) is set in the A2 field.
address information indicating whether the frame information or packet information is in use is set in the C field, etc.
■The message information to be sent is set in the field and the FC
For example, check information for fields A1 to I shown in the figure is stored in the S field.

Below, a brief explanation will be given of (1) transmission operation, (II) reception operation, and (HID originating station return frame processing) in each communication device.

(I) Transmission operation In FIG. 1, for example, communication device 2-1 is connected to another communication device 2.
Consider the case of sending to -3.

In this case, the communication device 2-1 detects the F pattern of circulating frame information and detects the beginning of the frame.

Next, the F pattern, the contents of the A1 field, and the contents of the A2 field are held until the contents of the C field shown in FIG. 2 are extracted.

A bit pattern indicating whether or not the frame information (or packet information - hereinafter referred to as frame information) is in use is written in the C field.

When it is determined that the C field is in use, the contents of the C field and the contents of the C field are displayed, starting with the above F pattern and continuing with the contents of the A1 field and A2 field that were previously held. The contents of the I field, . . . are sent onto the data highway 3.

In other words, use of the frame information is given up.

Needless to say, such processing involves a time delay corresponding to the bit string from the F pattern to the C field.

If the contents of the C field indicate an empty state, set the address information of the communication device 2-3, which is the receiving station, in the A1 field, and set the address information of the communication device 2-1, which is the transmitting station, in the A2 field. information is set, in-use information is set in the C field, a message is set as necessary in the (2) field, the FCS field is set, and the data is sent out on the data highway 3 in bit serial form.

(n) Reception operation Each communication device constantly monitors frame information circulating on the data highway 3, and when it detects the F pattern, it synchronizes with this and determines the contents of the A1 field.

If the contents of the A1 field match the unique address information given to itself, it is determined that the communication is addressed to itself, and the contents of the ■ field are taken in.

Then, if necessary, a busy display or an incoming call display is displayed in the C field.

If the content of the A1 field does not match the unique address information given to itself, the communication is not addressed to itself, and the received frame information is sent out onto the data highway 3 as is.

Round: Return to originating station frame processing When the frame information transmitted from the communication device 2-1 makes one round on the data highway 3, it is received by the communication device 2-1.

That is, the communication device 2-1, which is the originating station, compares the contents of the A2 field in the transmitted frame information with the unique address given to itself, and learns that the communication device 2-1 has been sent.

- When it is learned that the data has been cycled, it rewrites the contents of field A1 and below, and changes the contents of field C so that it is unused.

Communication using frame information circulating on the data highway 3 is performed as described above, but in the case shown in FIG. can.

The present invention provides that the monitoring device 1 at least
Address information such as the contents of the 1 field and the contents of the A2 field and/or the control information of the above C field are monitored to collect management information.

FIG. 3 shows the configuration of one embodiment of the monitoring device.

Reference numerals 1 and 3 in the figure correspond to those in FIG. 1, and 4, 5, and 6 are shift registers, respectively, in which a shift operation is performed in a time equal to the length of time for one bit of data on the data highway; 7 to 9 are pattern detection units, respectively, 10 to 12 are instruction pattern storage registers, respectively, and 13 to 1.
Reference numerals 5 and 18 respectively represent comparison and coincidence circuit units and counters.

Register 4 can be considered to have a number of stages equal to the bit width of the A1 field, register 5 has a number of stages equal to the bit width of the A2 field, and register 6 can be considered to have a number of stages equal to the bit width of the C field. .

Further, register 10 is set with a bit pattern corresponding to the content of field A1 that is desired to be extracted, register 11 is set with a bit pattern that corresponds to the content of field A2 that is desired to be extracted, and register 12 is set with a bit pattern that corresponds to the content of field A2 that is desired to be extracted. bits corresponding to the contents of the C field for which you want
The pattern is set.

Preferably, these registers are configured to be rewritable.

The monitoring device 1 correctly sets the contents of the A1 field in the register 4, the contents of the A2 field in the register 5, and the contents of the C field in the register 6, based on the extraction of the F pattern for the circulating frame information. The comparison matching circuit units 13, 14, and 15 are enabled at the timing.

The contents of each field above are registered in registers 10 and 1, respectively.
1.12, the step signal al, a2. C
is emitted and counted by counters 16, 1γ, and 18, respectively.

The value of each counter 16, 17.18 is determined by each register 1 for frame information circulating on the data highway 3.
It represents the number of times a pattern set to 0, 11, or 12 existed.

Therefore, the count value and each register 10, 11, 1
With the contents of 2, it becomes possible to collect management information.

If necessary, the AND logic of the step signals a1 and a2 shown in FIG. You can also know.

It is also optional to divide the contents of the C field into multiple items and count each item separately, if necessary.

As described above, according to the present invention, it is possible to monitor the state of frame information (or packet information) on the data highway 3 and collect management information at all times or at a desired time.

[Brief explanation of drawings]

FIG. 1 shows a system according to an embodiment of the present invention, and FIG. 2A shows a system according to an embodiment of the present invention. B shows one embodiment of frame information circulating on the data highway, and FIG. 3 shows one embodiment of the configuration of a monitoring device. In the figure, 1 is a monitoring device, 2-1 to 2-4 are husband and wife communication devices, 3 is a data highway, 4 to 6 are registers, 10 to 12 are instruction pattern storage registers,
13 to 15 are comparison and matching circuit sections, 16 to 18, respectively.
each represents a counter.

Claims (1)

[Claims] 1 A plurality of communication devices and at least one monitoring device are connected in a loop by a data highway,
In a packet-switched data highway system in which packet information sent from the communication device and/or monitoring device is received by another communication device and/or monitoring device while making one circuit on the data highway, at least the monitoring device extracts at least the contents of the address field and/or the contents of the control field in the packet information passing through the monitoring device, and combines the contents with the bits specified in advance.
A packet-switched data highway system configured to detect matches with a pattern and count the number of matches.