Method and apparatus for avoiding collisions in an electronic bu

Details Method and apparatus for avoiding collisions in an electronic bu Method and apparatus for avoiding collisions in an electronic bu

1996-03-08

1998-06-09

Hsu, Alpus H.

Multiplex communications

Duplex

Convertible to half duplex

370384, 370445, H04J 312, H04L 516

Patent

active

057646295

ABSTRACT:
An electronic business set terminal (24) includes a signaling gate array (40) that performs reception and transmission of 8 kHz signaling messages while avoiding collisions that may result in message loss. The signaling gate array (40) includes a receiver section (50) that detects for activity on an 8 kHz signaling line (20). A start bit detector (62) identifies the beginning of a receive message that is collected by a data collector (64). A transmitter section (52) sends a transmit message when no activity is present on the 8 kHz signaling line (20) and there is no indication from the start bit detector (62) that a receive message is in the process of being received. A collision detector and avoidance unit (72) checks for activity on the 8 kHz signaling line (20) while the transmitter section (52) awaits for a zero crossing to occur on an 8 kHz clock signal used in sending the transmit message. Upon initiation of transmission, the collision detector and avoidance unit (72) checks for activity on the 8 kHz signaling line (20) while sending each zero bit of the transmit message. The collision detector and avoidance unit (72) is driven by a collision window pulse that ensures that activity on the 8 kHz signaling line (20) is checked at the proper times to eliminate potential false activity status.

REFERENCES:
patent: 4210780 (1980-07-01), Hopkins et al.
patent: 4500990 (1985-02-01), Akashi
patent: 4661902 (1987-04-01), Hochsprung et al.
patent: 5130983 (1992-07-01), Heffner, III.
patent: 5155727 (1992-10-01), Borup et al.

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