Airvana, Inc.

Boston Technology, Inc.

Minh Hoang

Kenneth Dale Jones

Guy Criscenzo

Techniques for facilitating a hand-in using proximity-detection and dual-pilot operation detect a presence of a client device in proximity to the network-side device; and transmit a first signal over a first communication channel to the client device, the first signal enabling the client device to access information transmitted in a second signal from the network-side device.

Proximity detection in a network

A coin tone validator (CTV) is located in a local central office and is connected between a pay telephone and a switching system. The CTV monitors DC loop current changes using opto-couplers inserted into a local loop in addition to measuring standard 1700 Hz and 2200 Hz tone frequencies generated when a coin is inserted into the paystation. A comparison of the two components, the current changes and the frequencies, is performed to determine a timing and magnitude relationship. If the frequency component is misaligned within a specified time frame or the magnitude is not sufficient, then the tones received or the current change sensed are dismissed as interference. The CTV prevents users of pay telephones from fraudulently generating coin tones that are acoustically coupled into the handset of a paystation from a calling station at any time during a call.

Growing community of inventors

Acton, MA, United States of America

Minh Hoang