JPH07221815A - Communication speed alarm equipment - Google Patents

Abstract

PURPOSE:To realize the simple communication speed alarm equipment in which a communication speed is set optionally suitable for a communication path to which a terminal equipment is connected. CONSTITUTION:A communication speed of a communication opposite party connected via a communication line to a terminal equipment is entered as a setting value. When the terminal equipment uses the communication speed in excess of the setting speed, an alarm is raised. The terminal equipment receiving the output inhibits data transmission or reduces the communication speed. Furthermore, a buffer is provided and a data storage quantity by the buffer is detected and when the rapid increase in the data storage quantity is detected, an excess warning alarm output is made in advance before the quantity reaches a setting value. Thus, the terminal equipment sets optionally the communication speed depending on the opposite party to be communicated. Furthermore, the device is carried in response to the request to the installed location of the plural terminal equipments.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention is used in digital communications. In particular, it relates to a connection technology between communication networks having different speeds.
The present invention is suitable for use in a LAN adapter.

[0002]

2. Description of the Related Art Hardware included in a plurality of terminal devices,
In order to share resources such as software and data among users, a method of connecting terminal devices to each other via a network has become widespread. W that is installed over a wide area using a public line as a network
There are an AN (Wide Area Network) and a LAN (Local Area Network) that uses a private line installed in a specific premises.

A conventional example of connecting a terminal device and a LAN will be described with reference to FIG. FIG. 4 is a diagram showing a connection configuration between a conventional terminal device and a LAN. The terminal side interface 2 on the terminal device 1 side is connected to the line side interface 4 of the LAN side communication line 5 via the cable 3. The configuration of the cable 3 includes a power supply line for supplying a voltage of +12 V from the terminal side interface 2 to the line side interface 4, a transmission line RE for transmitting data from the terminal device 1 side to the LAN side communication line 5, and a LAN side communication line. 5, a reception line TR for transmitting data from the terminal device 1 side, and a collision detection line CO for transmitting data collision information from the line side interface 4 to the terminal side interface 2.

[0004]

In the conventional system in which the LAN and the terminal device are directly connected by the cable 3, the data transmission amount per unit time is determined by the processing capacity of the terminal device. Further, since it is premised that the terminal device on the sending side and the terminal device on the receiving side are connected by a LAN, the data is designed to be transmitted over the entire communication path at the same speed. Therefore, it is not assumed that a modem or ISDN will be inserted in the communication path on the way and the communication speed of that portion will be several hundredths of the original speed of the LAN.
Therefore, when the data transmission amount per unit time is predetermined by the contract, there arises a problem that the data flowing on the communication path is discarded at the entrance of the communication path having a low communication speed.

To solve this problem, Japanese Patent Laid-Open No. 62-
Japanese Patent No. 281538 discloses a device that performs speed conversion and collision detection as a "network connection method".
This is to detect data having a possibility of collision in advance and control the transmission so that the collision can be avoided, and also perform speed conversion adapted to the communication path to be connected.

In addition, Japanese Patent Laid-Open No. 63-294032 discloses a device as a "star connection LAN device" that temporarily stores data having a possibility of collision and controls transmission timing to avoid the collision. Has been done.

Further, Japanese Unexamined Patent Publication No. 1-252039 discloses an apparatus for performing speed conversion and code conversion adapted to a communication path connected as a "data communication system".

All of these are proposals for connecting communication networks having different communication speeds to each other. The communication path to be connected is determined in advance, and the collision is predicted in the communication path. However, among these proposals, there is an idea that a simple device is used to monitor the data transmission amount in the communication currently being performed, and a communication speed excess alarm is issued when the preset value is exceeded. Absent.

The present invention has been made against such a background, and a communication speed adapted to a communication path to be connected can be arbitrarily set and an alarm can be issued when the data transmission amount exceeds this communication speed. An object is to provide a simple communication speed alarm device.

[0010]

SUMMARY OF THE INVENTION The present invention is a communication speed alarm device, which is characterized by a detection circuit for detecting the amount of data per time of a transmission signal transmitted from a terminal device, and the detection circuit. A comparison circuit is provided for determining that the detected data amount per unit time exceeds the set data amount per unit time, and an alarm circuit for giving an alarm to the terminal device when the communication speed is exceeded at the output of the comparison circuit. Where it is. A branch circuit is provided in a transmission signal path for transmitting from the terminal device, and the detection circuit is connected to a branch terminal of the branch circuit, and includes an adder circuit for adding an alarm output of the alarm circuit to a reception signal path of the terminal device. Is desirable.

The principle of the present invention will now be described with reference to FIG. FIG. 1 shows the principle of the present invention. In the comparison circuit,
The set value is input from the outside. In the normal case, this set value is set to the upper limit of the communication speed of the communication line to which the terminal device is connected. The set value and the data amount detected by the detection circuit are compared by the comparison circuit, and when the upper limit value is exceeded, the alarm circuit outputs an alarm. Further, it is desirable that the device of the present invention is configured to be attachable to and detachable from the terminal device, and to be easily configured to be carried.

Further, a terminal side interface connected to the terminal device and a line side interface connected to a communication line are provided, and the branch circuit is provided in a transmission signal path between the terminal side interface and the line side interface. Preferably, the adder circuit is provided in the reception signal path between the line side interface and the terminal side interface. As a result, it is not necessary to provide a dedicated signal line, and it can be used simply by inserting it between existing signal lines.

It is desirable that the comparison circuit includes means for integrating and measuring the amount of data per unit time, and means for comparing the value integrated and measured by this means with a set value input. This setting value input can be arbitrarily set according to the communication speed of the communication path to which the terminal device is connected.

Further, the comparison circuit may be configured to include a buffer circuit for accumulating the transmission signal appearing at the branch terminal and a means for comparing the accumulation amount of the buffer circuit with the set value input. At this time, it is preferable that the terminal device is provided with an integrating circuit for detecting an integrated value of the accumulated amount of the buffer circuit, and the terminal device determines that the transmission is completed when the integrated value is in a direction of no increase or decrease. As a result, it is possible to avoid a situation in which an alarm output is output during transmission and communication is interrupted.

Further, the integrating circuit includes means for detecting a sudden increase in the data amount of the buffer circuit, and when the detecting means indicates a sudden increase in the data amount, the warning output is preliminarily notified before reaching the set value input. It is also possible to adopt a configuration including means for outputting as an alarm output. This allows
It is possible to prevent a large amount of packets from being lost due to a large excess of data.

[0016]

The communication speed of the communication partner connected to the terminal device via the communication line is input to the device of the present invention as a set value. When the terminal device uses a communication speed exceeding this set value, the device of the present invention outputs an alarm to the terminal device. In response to this, the terminal device may prohibit the data transmission, or may reduce the communication speed. Also,
The buffer may be provided so that the data storage amount of the buffer is detected, and when a rapid increase in the data storage amount is detected, the excess warning alarm is output in advance before the set value is reached.

The device of the present invention is detachably attached to the terminal device and has a size convenient for carrying. Thereby, the communication speed can be arbitrarily set according to the other party with which the terminal device communicates. Further, it can be carried and used at the installation locations of a plurality of terminal devices as required.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the first embodiment of the present invention will be described with reference to FIG. FIG. 2 is a block diagram of the first embodiment of the present invention.

The present invention is a communication speed alarm device, and is characterized by a data amount detection circuit 10 for detecting the amount of data of a transmission signal transmitted from the terminal device 1 per unit time.
And a data amount comparison circuit 12 for determining that the data amount per time detected by the data amount detection circuit 10 exceeds the set data amount per time, and the output of the data amount comparison circuit 12 is obtained. The jam signal generating circuit 7 is provided as an alarm circuit for alarming the terminal device 1 that the communication speed is exceeded. A branch circuit 25 is provided on the transmission line TR as a transmission signal path for transmitting from the terminal device 1, and the data amount detection circuit 10 is connected to the branch terminal of this branch circuit 25, and the alarm output of the jam signal generation circuit 7 is output to the terminal device 1 The adder circuit 6 is provided for adding to the reception line RE as the reception signal path. Further, it is provided with a terminal side interface 2 connected to the terminal device 1 and a line side interface 4 connected to the communication line 5, and the branch circuit 25 includes a transmission line between the terminal side interface 2 and the line side interface 4. The adder circuit 6 provided in TR is provided in the reception line RE between the line side interface 4 and the terminal side interface 2. Data amount comparison circuit 12
Is a means for integrating and measuring the amount of data per unit time,
And means for comparing the value integrated and measured by this means with the set value input.

Next, the operation of the first embodiment of the present invention will be described. The terminal side interface 2 of the terminal device 1 is + 12V
Is fed to the line side interface 4 by a power feeding line. A collision detection signal for detecting a data collision received from the LAN side communication line 5 at the line side interface 4 is transferred to the terminal side interface 2 by the collision detection line CO. Also, L received by the terminal side interface 2
The transmission data to the communication line 5 on the AN side is transmitted to the line side interface 4 by the transmission line TR. At this time, the transmission data branched from the transmission line TR is also transmitted to the data amount detection circuit 10 and the transmission end detection circuit 9. The line side interface 4 transmits the transmission data to the LAN side communication line 5.

The data amount detection circuit 10 detects the amount of transmission data to the communication line 5 on the LAN side and transfers the numerical value to the data amount comparison circuit 12. The amount of data detected by the data amount comparison circuit 12 is the amount of real-time transmission. this is,
It is also possible to set the transmission amount within a unit time. The data amount comparison circuit 12 is set with a comparison value from the comparison value input unit 11.
This set value may be arbitrarily set according to the communication path to which the communication speed warning device 30 is connected. Further, the set value may be an actual comparison value or a selected value of a plurality of predetermined values.

The data amount comparison circuit 12 includes a comparison value input section 1
The comparison value designated by 1 is compared with the output from the data amount detection circuit 10, and when the value from the data amount detection circuit 10 is large, "1" is output to the AND circuit 13. This comparison may be a digitally mapped approximation value other than a real number of data amount. The transmission end detection circuit 9 monitors the transmission data to the LAN received by the line side interface 4, detects the transmission end in packet units, outputs "0" when there is a packet, and "1" when there is no packet. Is output to the AND circuit 13. The received data from the line side interface 4 is transmitted to the adder circuit 6 and the received data detection circuit 8.

The received data detection circuit 8 monitors the received data, and outputs "0" to the AND circuit 13 when there is data and "1" when there is no data. AND circuit 1
3 outputs “1” to the jam signal generation circuit 7 when all three inputs are “1”. This output is a pulse output for a fixed time. In response to this, the jam signal generation circuit 7 outputs a jam signal for stopping the data transmission of the terminal device 1.
The jam signal generation time in the jam signal generation circuit 7 is AND
The "1" of the output of the circuit 13 may be detected or may be transmitted for a fixed time. The jam signal generation circuit 7 is LA in the addition circuit 6.
The received data from the communication line 5 on the N side is added and transmitted to the terminal device 1 via the terminal side interface 2. The terminal device 1 is prohibited from transmitting data by receiving the jam signal until the jam signal disappears. Further, the reception data detection circuit 8 plays a role of stopping the jam signal transmission in the time zone in which there is the reception data from the communication line 5 on the LAN side.
If the data may be lost, this circuit may be omitted. The data amount detection circuit 10 can be realized by a simple circuit that advances the counter during the data transmission time. The data amount comparison circuit 12 includes a memory comparison means and a circuit for comparing bit data as they are, and the comparison as it is can be realized easily and at low cost. The jam signal generation circuit 7 can be realized by one crystal oscillator that outputs a periodic pulse of 10 MHz or the like. Further, the presence or absence of the control of the communication amount can be automatically determined by the address in the transmission data of the communication line 5 on the LAN side. Addresses may be specified individually or by network number.

Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 3 is a block diagram of the second embodiment of the present invention. In the second embodiment of the present invention, the reception line RE and the transmission line T
A reception buffer unit 14 and a transmission buffer unit 15 are provided in R, respectively. The transmission buffer unit 15 outputs its own transmission data amount and notifies the buffer amount comparison circuit 17 and the integration circuit 16 of it. The buffer amount comparison circuit 17 compares the set value input from the comparison value input unit 11 with the transmission data amount from the transmission buffer unit 15, and outputs “1” when the transmission data amount is larger than the set value. . The integrating circuit 16 is
The increase / decrease of the transmission data amount value of the transmission buffer unit 15 is output as "0" as an increasing value and "1" as an increasing or decreasing value. The outputs of the buffer amount comparison circuit 17 and the integration circuit 16 are input to the AND circuit 13. When the buffer increase / decrease information of the integrating circuit 16 is “1”, that is, when there is no increase or decrease, it is determined that the transmission of the terminal device 1 is completed, the jam signal generating circuit 7 and the voltage adding circuit 18 are activated, The jam signal and the voltage signal which are the transmission interruption signals of the terminal device 1 are output. This is a configuration in which the jam signal and the voltage signal are not output during the data transmission of the terminal device 1.
The jam signal is input to the interface 19 and prohibits the terminal device 1 from transmitting data. Voltage signal is I / O base 2
Input to 0 and 21. Although not shown here, the operation of the device connected to the contact of the I / O base 20 or 21 can be controlled by the voltage signal.

Further, since the integrated value of the integrating circuit 16 indicates the rate of increase of data, a sudden increase in data in the transmission buffer section 15 is detected by setting the output determination value of "0" or "1" to something other than increase or decrease, and a jam signal is detected. It is also possible to output a voltage signal.
That is, by providing the output of the integrating circuit 16 with the output showing the rapid increase of the data amount in addition to showing the increase or decrease of the data amount,
When this is detected, the jam signal and the voltage signal can be output in advance as the excess alarm warning output before the data amount reaches the set input value. In order to detect a sudden increase, it is sufficient to detect and compare the amount of data accumulation between two points that differ in time series. The data amount notification from the transmission buffer unit 15 may be the current buffer amount notification, or may be either the buffer reception data amount or the transmission data amount.

[0026]

As described above, according to the present invention,
It is possible to realize a simple device that can arbitrarily set a communication speed suitable for a communication path to be connected and can issue an alarm when the data transmission amount exceeds this communication speed.

[Brief description of drawings]

FIG. 1 is a principle diagram of the present invention.

FIG. 2 is a block diagram of the first embodiment of the present invention.

FIG. 3 is a block diagram of a second embodiment of the present invention.

FIG. 4 is a diagram showing a connection configuration of a conventional terminal device and a LAN.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Terminal device 2 Terminal side interface 3 Cable 4 Line side interface 5 Communication line 6 Adder circuit 7 Jam signal generation circuit 8 Received data detection circuit 9 Transmission end detection circuit 10 Data amount detection circuit 11 Comparison value input section 12 Data amount comparison circuit 13 AND circuit 14 Reception buffer unit 15 Transmission buffer unit 16 Integration circuit 17 Buffer amount comparison circuit 18 Voltage addition circuit 19 Interface 20, 21 I / O base 25 Branch circuit 30 Communication speed alarm device RE reception line TR transmission line CO Collision detection line

Claims (7)

[Claims] 1. A detection circuit for detecting a data amount per hour of a transmission signal transmitted from a terminal device, and a data amount per time detected by the detection circuit exceeding a set data amount per time. A comparison circuit for judging,
A communication speed warning device, comprising: an alarm circuit for warning the terminal device of an excess of the communication speed obtained at the output of the comparison circuit. 2. A branch circuit is provided in a transmission signal path for transmission from the terminal device, the detection circuit is connected to a branch terminal of the branch circuit, and an alarm output of the alarm circuit is added to a reception signal path of the terminal device. The communication speed warning device according to claim 1, further comprising an adding circuit. 3. A terminal side interface connected to the terminal device, and a line side interface connected to a communication line, wherein the branch circuit is provided in a transmission signal path between the terminal side interface and the line side interface. 3. The communication speed warning device according to claim 2, wherein the addition circuit is provided in a reception signal path between the line side interface and the terminal side interface. 4. The communication speed alarm according to claim 1, wherein the comparison circuit includes means for integrating and measuring a data amount per unit time, and means for comparing a value integrated and measured by this means with a set value input. apparatus. 5. The communication speed warning device according to claim 1, wherein the comparison circuit includes a buffer circuit for accumulating a transmission signal appearing at a branch terminal, and means for comparing an accumulation amount of the buffer circuit with a set value input. . 6. An integration circuit for detecting an integrated value of the accumulated amount of the buffer circuit, and further comprising means for judging that the terminal device has completed the transmission when the integrated value is in the direction of no increase or decrease. The communication speed alarm device described. 7. The integrator circuit includes means for detecting a sudden increase in the amount of data in the buffer circuit, and when the detecting means indicates a sudden increase in the amount of data, an advance warning is issued before the alarm output reaches the set value input. The communication speed alarm device according to claim 5, further comprising means for outputting as an alarm output.