Method and apparatus for switching communications from a seconda

Details Method and apparatus for switching communications from a seconda Method and apparatus for switching communications from a seconda

1992-12-24

1995-12-26

Nguyen, Hoa T.

G06F 1100

Patent

active

054796504

ABSTRACT:
Some data communications networks employ the use of both a leased line and a dial-up line between two modems. Typically, the dial-up line provides a backup capability when the leased line causes a degradation in the signal quality of the data signal. This degradation of the signal quality of the data signal is detected by one of the two modems, which then automatically establishes a data connection over the dial-up line. However, it is preferable to switch back to the leased line as soon as possible since the leased line usually costs less than the dial-up line. Therefore, in order to test the leased line, the entire data signal is simultaneously transmitted on both the dial-up line and the leased line. The use of the existing data signal to test the leased line's effect on signal quality allows the modem to perform a more complete analysis of the returned data signal so that a premature transition back to the leased line does not occur.

REFERENCES:
patent: 4385384 (1983-05-01), Rosbury et al.
patent: 5138609 (1992-08-01), Hashimoto
patent: 5191583 (1993-03-01), Pearson et al.
patent: 5210740 (1993-05-01), Anzai et al.

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