Patent ID: 6230010
Filing Date: 2001-05-08
Classification: H04B,H04L,H04M,H04W

Abstract:
A modem for transmission data signals in a synchronous mode over a telephone landline, a wireless radio frequency network or a cellular telephone system without incurring errors in the transmitted data signals from a loss of carrier or a noisy transmission environment and for transmitting voice signals over the telephone landline, a wireless radio frequency network or a cellular telephone system, comprising:a modem for converting received digital signals to analog signals and for converting received analog to digital signals;a data access arrangement operatively connected to said modem and including a means to operatively connect to the telephone landline;a microcontroller operatively connected to said modem;a read-only-memory operatively connected to said microcontroller;protocol software in said read-only-memory in the form of firmware for controlling the operation of the modem;cellular telephone interface means for connected said microcontroller to a cellular telephone transceiver unit;radio frequency radio interface/logic board means for connected said mictocontroller to a radio frequency transceiver unit;a voice board means for providing hands-free communication using a microphone and speaker over a telephone landline, a wireless radio frequency network or a cellular telephone system;analog switch means for receiving inputs from said voice board means, said radio frequency transceiver, said cellular telephone transceiver and said modem and providing outputs to said data access arrangement, said radio frequency transceiver, and said cellular telephone transceiver; andmeans to connect data terminal equipment to said microcontroller through an interface.