Maintenance signal transmission system

Details Maintenance signal transmission system Maintenance signal transmission system

1991-11-21

1994-01-25

Safourek, Benedict V.

Multiplex communications

Wide area network

Packet switching

371 82, 34082501, H04J 302, H04J 1408

Patent

active

052821935

ABSTRACT:
A maintenance signal transmission system incorporates a transmitting station, a receiving station, a main line which connects the transmitting station and the receiving station, and a backup line which connects the transmitting station and the receiving station. The transmitting station at least includes a switch for selectively connecting to one of the main line and the backup line to transmit a main signal and a maintenance signal to the receiving station using the selected line. The receiving station at least includes an adder for adding maintenance signals which are received from both the main line and the backup line. The main and backup lines may or may not take mutually different routes.

REFERENCES:
patent: 4967406 (1990-10-01), Yagi et al.
patent: 5031176 (1991-07-01), Magne et al.
patent: 5115449 (1992-05-01), Lockyer et al.

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