Patent ID: 6298121
Filing Date: 2001-10-02
Classification: H04M

Abstract:
An improved data circuit terminating equipment (DCE-1) for making a call over a single analog-loop telephone line, comprising:a micro-controller for selectively operating the DCE-1 in different ones of at least three modes by switching on demand during the call, responsive to real time local events or commands as well as real time remote commands, wherein the DCE-1 is in a first idle mode when not transmitting voice and data for the call, and the at least three modes include a second mode where the DCE-1 exchanges only analog voice with another data circuit terminating equipment (DCE-2) at the other end of the analog loop telephone line for the call without provision for exchanging communication data, a third mode where the DCE-1 interleavingly exchanges digitized voice as well as communication data with the DCE-2 for the call supporting simultaneous voice and data (SVD) communication, and a fourth mode where the DCE-1 exchanges digital communication data with the DCE-2 at the other end of the analog-loop telephone line for the call without making allowance for exchanging voice;said real time local events or commands being events occurring or commands provided in real time by equipment coupled to the DCE-1 at the same end of said analog-loop telephone line, and said real time remote commands being commands provided in real time through the DCE-2 by equipment coupled to the DCE-2 at the other end of said analog-loop telephone line.