Patent ID: 6108348
Filing Date: 2000-08-22
Classification: H04B,H04L,H04Q

Abstract:
A digital communication system for communication, said digital communication system comprising:a source of synchronous information data at a data rate of 2.4 kbps, and associated control bits:a first rate adaptation arrangement coupled to said source of information data and to an input port of said link, for converting said data at a data rate of 2.4 kbps to 3 kbps data at a data rate of 3 kbps, said 3 kbps data being organized in successive 10 msec frames, each of 30 bits each said 10 msec, 30-bit frame having 24 data bits, and including a single X status bit, an E7 bit which alternates binary states from one frame to the next, and S3 and S8 status bits, but not S4 and S9 status bits, during those frames in which said E7 bit takes a first binary state, and each said 10 msec, 30-bit frame including S4 and S9 status bits, but not S3 and S8 status bits, during those frames in which said E7 bit takes a second binary state, whereby information relating to said S3 and S4 bits is multiplexed onto alternate ones of said 10 msec, 30-bit frames, and information relating to said S8 and S9 bits is multiplexed onto alternate other ones of said 10 msec frames, said first rate adaptation arrangement being for transmitting said 3 kbps data over said link;a second rate adaptation arrangement coupled to an output port of said link, for converting said 3 kbps data to 8 kbps data; anda third rate adaptation arrangement coupled to said second rate adaptation arrangement, for converting said 8 kbps data to 64 kbps data, whereby said 64 kbps data can be coupled to an ISDN-compatible system.