COMMUNICATIONS WEB FOR PSTN SUBSCRIBERS

摘要

Systems for connecting telecommunications infrastructure lines t o telephone s, handsets, computers, telecopy machines and other end user interfaces or consumer electronics devices in a residence or business. Systems according t o the present invention include Network Control Units which form the center of a star topology and which communicate via RF link with Wireless Access Units a nd handsets. Wireless Access Units feature an interface, such as, for example, a standard telephone jack, for accommodating a telephone, a fax machine, a compute modem or other device. In order to compensate for line loss, mismatc h and other incompatibilities between the public telecommunications network on the one hand and systems according to the present invention on the other, ne w encoding techniques according to the present invention employ codecs which encode and decode using 10 bit code words, as compared to conventional mu-la w encoding and decoding which uses 8 bit code words. The resulting 16 bit performance yields a subjective 90dB signal to noise ratio over the radiofrequency link of systems of the present invention. Such encoding techniques and 10 bit code segments can easily be accommodated by present processing capacity which was not available in the era in which mu-law encoding was adapted.