JPH1021170A - Testing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily test whether the functions of a terminal are normally operated or not by simulating the generation of loss-of-carry or late collision and testing whether the terminal can detect it or not. SOLUTION: A data-in(DI) suppressing means 21 suppress DI to the terminal of transmission source and detects the loss-of-carry. A pseudo data-out(DO) generating means sends out pseudo DO, generates collision and detects the late collision. A testing device 2 sends out the data received from the terminal to a transceiver 3, the loop-back data of DO transmitted from the transceiver 3 to the transmission source are suppressed by the DI suppressing means 21, and it is tested whether the loss-of-carry is detected or not by disabling the reception of loop-back data after the lapse of prescribed time at the terminal corresponding to the suppression. Therefore, by simulating the generation of a loss-of-carry or late collision it can be tested whether the terminal can detect it or not.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a test apparatus for testing a terminal.

[0002]

2. Description of the Related Art Conventionally, a terminal is connected to a LAN via a transceiver and a switching hub, the terminal transmits a packet to the transceiver, and the transceiver loops back the packet to respond to the terminal. When the loopback does not return even after the lapse of time, it is configured to be detected as a loss of carry.

Further, when a terminal transmits a packet to a destination terminal and returns a response indicating that a collision has occurred, a late collision is detected when a predetermined time (for example, 51.2 μs) or more is detected, and a late collision is detected. In this case, a normal collision (collision) is detected.

[0004]

However, in order to test whether or not the terminal has normally detected the above-described loss of carry, the loss of carry is generated at an arbitrary timing to determine whether the terminal detects the loss of carry. There is a problem that such a test cannot be easily performed.

[0005] In order to test whether or not the terminal normally detects the latter late collision, a late collision is generated at an arbitrary timing and a test is performed to determine whether or not the terminal detects late collision. Cannot be performed easily.

[0006] The present invention solves these problems,
It is an object of the present invention to provide a test apparatus between a terminal and a transceiver and to generate a loss-of-carry or late collision to test whether the terminal can be detected.

[0007]

Means for solving the problem will be described with reference to FIGS. 1 and 4. In FIGS. 1 and 4, the test apparatus 2 performs a terminal test (loss of carry and collision test). Here, a DI (data-in) suppressing unit 21 and a pseudo DO (data-out) generating unit 23 And so on.

[0008] The DI suppressing means 21 transmits the D to the source terminal.
I suppresses I and detects loss of carry.
The pseudo-DO generating means 23 sends out pseudo-DO to generate a collision and detect late collision / collision.

The transceiver 3 transmits and receives data. Next, the operation will be described. In FIG. 1, the test apparatus 2 sends the data received from the terminal to the transceiver 3, and suppresses the loopback data of the DO transmitted to the transmission source transmitted from the transceiver 3 by the DI suppression means 21. Correspondingly, it is configured to test whether or not the terminal cannot receive loopback data after a predetermined time has elapsed and detects a loss of carry.

In FIG. 4, the test apparatus 2 sends data received from the terminal to the transceiver 3, and
The pseudo-DO generating means 23 sends the same data to the transceiver 3 after a lapse of a predetermined time to generate a collision, and transmits the collision signal transmitted from the transceiver 3 to the transmission source SA. Then, it is designed to test whether a late collision is detected or a collision before a predetermined time elapses and a normal collision is detected.

Therefore, the test apparatus 2 is provided between the terminal and the transceiver 3, and it is possible to test whether or not the terminal can be detected by generating a pseudo loss of carry or late collision.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the construction and operation of an embodiment of the present invention will be sequentially described in detail with reference to FIGS.
Here, a test of whether or not the terminal can detect loss of carry will be described.

FIG. 1 is a block diagram showing an embodiment of the present invention.
In FIG. 1, a switching hub 1 transmits and receives packets to and from a terminal connected to a port,
(Attachment Unit Interface) transmits and receives packets to and from the LAN via the test apparatus 2 and the transceiver 3 according to the present invention.

The test apparatus 2 is provided between the terminal and the transceiver 3, and performs a test of the terminal. In this case, the test apparatus 2 includes a DI suppressing means 21, a timer 22, and the like. .

The DI suppressing means 21 is for suppressing the DI transmitted from the transceiver 3, causing the source terminal to detect a loss of carry, and testing the terminal. The timer 22 measures a set timer value.

Next, the operation of detecting the loss of carry of the terminal and testing the terminal under the configuration of FIG. 1 will be described in detail according to the sequence shown in the flowchart of FIG. FIG. 2 is a flowchart illustrating the operation of the present invention.
Here, the terminal 1 represents a packet transmission source terminal, the terminal 2 represents a packet transmission destination terminal, and the test apparatus 2 corresponds to FIG.
And the transceiver 3 represents the transceiver 3 of FIG.

In FIG. 2, a step S1 sets a timer value in the test apparatus 2. In step S2, the number of tests is set in the test apparatus 2. In S3, the source terminal 1 outputs the packet to the DO via the test device.

In step S4, the packet transmitted to DO (data out) in step S3 passes through the test apparatus 2 and the transceiver 3
And is level-converted by the level conversion means 31.

In step S5, the packet whose level has been converted in step S4 is transmitted to the coaxial cable inside the transceiver. S6
Indicates that the packet transmitted to the coaxial cable in S5 is level-converted by the level
(Data-in) and the destination DA via the test apparatus 2
Is transmitted to the terminal 2.

At S7, the destination terminal 2 receives the packet. On the other hand, in S8, when the packet in the test apparatus 2 which has received the packet sent to the DO in S3 has reached the timer value, the process proceeds to S9.

In step S9, since the timer value is reached in step S8, the loopback means 32 of the transceiver 3 suppresses the transmission of the packet returned from the DI by looping the DO packet.

In step S10, it is determined whether DI has not been detected. This is to determine whether DI has not been detected even after a predetermined time has elapsed. Here, since the test apparatus 2 has suppressed the DI received from the transceiver 3 in S9, the transmission source terminal 1 does not detect the DI and becomes YES, and in S11 detects a loss of carry (transmission abnormality) and displays the fact. And so on. These S3 to S10 are repeated for the number of tests set in S2.

As described above, in response to the transmission of the packet by the transmission source terminal 1, the test apparatus 2 suppresses the DI from the transceiver 3, and the DI is maintained even if the terminal has passed the predetermined time.
Can be easily tested as normal when the terminal 1 detects the loss of carry and the terminal 1 cannot detect the loss of carry.

FIG. 3 shows an explanatory diagram (loss of carry) of the present invention. In FIG. 3, a terminal (transmission source) outputs a packet to DO (data out).

In response to the transmission of the packet by the DO, the terminal (transmission source) suppresses the DI returned from the transceiver by the test apparatus 2, and cannot detect the DI. Is detected and tested as normal. On the other hand, when the loss-off carry cannot be detected, the loss of carry function of the terminal (source) is tested as abnormal.

The terminal (transmission destination, DA (destination address)) receives a packet transmitted from the terminal (transmission source) to DO from DI. Next, FIGS.
The configuration and operation of another embodiment of the present invention will be sequentially described in detail with reference to FIG. Here, a test of whether or not the terminal can detect a collision will be described.

FIG. 4 shows another embodiment of the present invention. In FIG. 4, a test apparatus 2 includes a terminal and a transceiver 3
And performs a test of the terminal. In this case, the pseudo DO generating means 23 and the timer 24 are provided.

The pseudo-DO generating means 23 transmits the DO received from the terminal to another port of the transceiver 3 after a predetermined time, causes a collision, returns the CI to the terminal, and causes the terminal to detect late collision or collision. , For testing the terminal.

The timer 24 measures a set timer value. Next, the operation of detecting the collision / late collision of the terminal and testing the terminal in accordance with the sequence shown in the flowchart of FIG. 5 and the configuration of FIG. 4 will be described in detail.

FIG. 5 is a flowchart illustrating another operation of the present invention. Here, the terminal 1 indicates a packet transmission source, the terminal 2 indicates a packet transmission destination terminal, the test apparatus 2 indicates the test apparatus 2 in FIG. 4, and the transceiver 3 indicates the transceiver 3 in FIG.

In FIG. 5, S21 sets a timer value in the test apparatus 2. In step S22, the number of tests is set in the test apparatus 2. In S23, the transmission source terminal 1 outputs the packet to the transceiver 3 by DO (data out) via the test apparatus 2.

In step S24, the level conversion means 3 of the transceiver 3 which has received the data transmitted by DO in step S23.
4 performs level conversion and outputs the result to the internal coaxial cable, and the notifying means 35 sends loopback data to the terminal 1 of the transmission source by DI (data in).

At S25, the transmission source terminal 1 receives the DI sent at S24, and recognizes that the transmission path is normal. In step S26, the level conversion means 34, which has similarly received the packet from the coaxial cable, transmits the DI to the terminal 2 of the transmission destination (DA). Then, the destination terminal 2 receives the packet.

In step S27, the timer 24 is activated when the transmission source terminal 1 sends out the packet to the DO, and when a predetermined timer value is reached, the process proceeds to step S28. In S28, since it is determined in S27 that the predetermined timer value has elapsed, the DO from the terminal 1 is transmitted to the transceiver 3 in S29.

In step S30, the packet transmitted by the DO in step S29 is received by the level conversion means 34 of another port of the transceiver 3, and transmitted to the internal coaxial cable. At this time, the packet already transmitted in S24 and this time S3
The packet transmitted with 0 collides.

In S31, since the collision occurred in S30,
The notification means 35 transmits the collision signal to the terminal 1 of the transmission source by the CI. In step S32, the source terminal 1 transmits the CI
Determine whether it is received. Here, since the CI has been transmitted and received in S31, the result is YES, and the process proceeds to S33.

In a step S33, it is determined whether or not the timer value is greater than or equal to 51.2 μs. In the case of YES, the collision occurs when 51.2 μs or more has elapsed since the terminal 1 transmitted the packet to the DO, and thus the collision is determined to be a late collision in S34. On the other hand, in the case of NO, since the collision is within 51.2 μs after the terminal 1 sends the packet to the DO, the collision is determined to be a normal collision in S35. These S2
3 to S35 are repeated for the number of tests set in S22.

As described above, in response to the transmission of the packet by the transmission source terminal 1, the test apparatus 2 transmits the DO to the other port of the transceiver 3 and transmits the DO to the transceiver 3 again after a predetermined time has elapsed. And causes a collision signal to be transmitted from the transceiver 3 to the terminal 1 of the transmission source by CI. At this time, late collision when the terminal 1 is longer than a predetermined time (for example, 51.2 μs) or below a predetermined time It is possible to perform a late collision / collision test on the terminal 1 depending on which of the ordinary collisions is detected at the time of (1).

FIG. 6 shows another explanatory diagram (collision) of the present invention. FIG. 6A shows a state where the source terminal 1 of FIG. 5 has transmitted a packet to the transceiver 3 by DO.

FIG. 6B shows how the timer 24 of the test apparatus 2 shown in FIG. 5 starts when the packet shown in FIG. 6A is transmitted to the transceiver 3 by DO. FIG. 6C shows a pseudo DO. When the timer shown in FIG. 6B has elapsed for a predetermined time, the pseudo DO is generated in S28 of FIG. This shows the situation.

FIG. 6D shows a state in which a collision has occurred in the transceiver 3 in FIG. 6C and a collision signal has been transmitted to the transmission source terminal 1 by CI. (E) of FIG.
Determines whether the time until the terminal 1 has received the collision signal by the CI in FIG. 6D has elapsed 51.2 μs in the case where the terminal 1 transmits the DO, and here the elapsed time is determined. It is determined that there is.

FIG. 6 (f) shows that when terminal 1 received the collision signal by CI in FIG. 6 (e), 51.2 μs had already passed since the packet was sent to DO. Is determined to be a late collision. When the terminal 1 of the transmission source determines this late collision, it means that the recall collision function of the terminal 1 has been successfully tested.

[0043]

As described above, according to the present invention,
A test device 2 is provided between the terminal and the transceiver 3 to generate a loss-of-carry or late collision and test whether the terminal can be detected. Therefore, a loss-of-carry is generated at various timings. ,
Then, late collision / collision can be generated to easily test whether these functions of the terminal are working properly.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of one embodiment of the present invention.

FIG. 2 is a flowchart illustrating the operation of the present invention.

FIG. 3 is an explanatory diagram (loss of carry) of the present invention.

FIG. 4 is a configuration diagram of another embodiment of the present invention.

FIG. 5 is a flowchart illustrating another operation of the present invention.

FIG. 6 is another explanatory view (collision) of the present invention.

[Explanation of symbols]

 1: switching hub 2: test apparatus 21: DI suppression means 22, 24: timer 23: pseudo DO generation means 3: transceiver 31, 33, 34: level conversion means 32: loopback means 35: notification means

Claims (2)

[Claims] In a test apparatus for testing a terminal, means for sending data received from the terminal to a transceiver, loopback of the data by the transceiver, and suppression of loopback data to be transmitted to a transmission source are performed. Means for testing whether the terminal cannot receive response data after a predetermined time has elapsed and detects loss of carry. 2. A test apparatus for testing a terminal, means for transmitting data received from the terminal to the transceiver and transmitting the same data to the transceiver after a lapse of a predetermined time to generate a collision, and a collision transmitted from the transceiver. Means for transmitting a signal to the source SA to test whether the terminal detects a late collision due to a collision after a lapse of a predetermined time or a collision before a lapse of a predetermined time to detect a normal collision. A test device.