US Patent No: 5,689,513
Number of patents in Portfolio can not be more than 2000
Data transmission system having a backup testing facility
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Nov 18, 1997
Issued date -
Mar 29, 1996
filing date -
08/624,055
serial no -
In Force
status
Importance
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Abstract
A data transmission system having, in addition to a normal system operation mode, a test mode wherein a plurality of stations confirm each other through sending and receiving check data for security confirmation and wherein the actual line switching operation is not performed. In the test mode, when notifying test data for confirmation of another station, the call terminating station side notifies the accurate data, while the call originating station side activating the test mode notifies deliberately changed check data thereby enabling a test for confirmation of the continuance of connection with a backup line without suspending communication with the working line.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 5,200,949 Link changeover control system for local area network of broadcasting arrangement | 26 | 1991 | |
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| 4,484,273 Modular computer system | 130 | 1982 | |