Subscriber unit for compressing and transmitting high speed...

Details Subscriber unit for compressing and transmitting high speed... Subscriber unit for compressing and transmitting high speed...

2005-05-03

2005-05-03

Ton, Dang (Department: 2666)

Multiplex communications

Communication over free space

Combining or distributing information via frequency channels

C370S337000

Reexamination Certificate

active

06888815

ABSTRACT:
Two related voiceband compression techniques are employed in order to enable an RF subscriber unit to accommodate data signals of high speed voiceband modems and FAX machines. A High Speed Codec enables the subscriber unit to pass voiceband modem and FAX transmissions at up to 9.6 kb/s. An Ultra-High Speed Codec supports voiceband modem and FAX transmissions up to 14.4 kb/s. The High Speed Codec operates using three 16-phase RF slots or four 8-phase RF slots, and the Ultra-High Speed Codec operates using four 16-phase RF slots. Because these codecs transmit information over several RF slots which can be contiguous, the slots within RF communication channels are dynamically allocated. The Dynamic Time slot/Bandwidth Allocation feature detects and monitors the data transmission and forms a data channel from the necessary number of slots.

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