Multiplex communications – Diagnostic testing – Of a repeater
Patent
1997-09-24
2000-03-07
Horabik, Michael
Multiplex communications
Diagnostic testing
Of a repeater
370246, 370242, 370243, 370249, 379 21, 379 29, 379 90, G01R 3108, G06F 1100, G08C 1500, H04M 124
Patent
active
060349484
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a system for testing a repeating installation having networks connected to terminals, and particularly, to one capable of, without physically installing and constituting testing network media and testing terminals for test environmental facilities, carrying out evaluations such as testing the repeating function of a repeating installation and verifying various kinds of protocol data and a variety of repeating data.
BACKGROUND ART
Generally, when testing, for example, a newly developed repeating installation at, for example, a factory at the time of shipment of the product, the repeating installation 100 to be tested is combined with various types of external test terminals A, B, C, D, E, F, G, H, and the like through repeating installations 110, 111, 112, 113, and the like and network media, as shown in FIG. 11A, so that data may be returned. The external test terminal B, for example, transmits test data to the external test terminal G through the repeating installation 100, the external test terminal G returns the same, the external test terminal B checks the returned result, and according to the returned result, the repeating connection function of the repeating installation 100 is verified.
At this time, the received data at the external test terminal B is compared with expected value data prepared in advance, to verify the transmission and reception functions of the repeating installation 100 and detect data errors.
In FIG. 11A, the repeating installation 100 has a line controller 101 for controlling lines, a transmitter-receiver 102 having transmission-reception paths P.sub.0 to P.sub.3, and a transmitter-receiver 103 having transmission-reception paths P.sub.4 to P.sub.7.
The line controller 101 controls the preparation of a line control table for the transmitter-receivers 102 and 103, to indicate a transmission-reception path corresponding to a destination terminal. For example, when data is transmitted and received between the test terminals B and G, the transmitter-receiver 102 is provided with a line control table (not shown) that is prepared according to an instruction from the line controller 101 and contains line control data indicating a route to the test terminal G through the transmission-reception path P.sub.5. and the transmitter-receiver 103 is provided with a line control table (not shown) that is similarly prepared and contains line control data indicating a route to the test terminal B through the transmission-reception path P.sub.2.
In the repeating installation 100, when the test terminal B sends data for the test terminal G, the transmitter-receiver 102 refers to the line control table, recognizes that the transmission-reception path of the destination is P.sub.5, adds the same to the data, and sends them to a system bus 104. Then, the transmitter-receiver 103 fetches the data and sends the same to the test terminal G through the transmission-reception path P.sub.5.
After receiving the data, the test terminal G returns it to the test terminal B. At this time, the transmitter-receiver 103 of the repeating installation 100 refers to the line control table, recognizes that the transmission-reception path of the destination is P.sub.2, adds the same to the data, and sends them to the system bus 104. Consequently, the transmitter-receiver 102 fetches the data and sends it to the test terminal B through the transmission-reception path P.sub.2.
In this way, the terminal B refers to results of the returned and received test data, to verify the repeating function of the repeating installation 100, and compares the received test data with expected value data prepared in advance, to verify transmission and reception functions and detect data errors.
Conventionally, a repeating installation is tested by connecting various kinds of network media to all transmission-reception paths of the repeating installation. Recent improvements in the capacity and functions of repeating installations, however, are increasing transmission-reception paths an
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patent: 5710760 (1998-01-01), Moll
Matsushita Kazuhiro
Nakamura Tetsuzi
Fujitsu Limited
Horabik Michael
Phan Man
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