ISDN terminal adapter using reduced memory for timing difference compensation

An ISDN (integrated services digital network) terminal adapter connected to a non-ISDN terminal equipment which generates a signal at twice the rate of an ISDN basic interface, said terminal adapter comprising:

• transmit means for transmitting said signal to an ISDN network where the signal is divided into two channel signals and transmitted over separate channels to a distant periphery of the network where the channel signals are byte-interleaved into a single data stream for transmission to a destination non-ISDN terminal equipment;
• receive means for receiving said data stream from said ISDN network;
• deinterleaving means for separating the received data stream into first and second frame sequences on a byte-by-byte basis, said first and second frame sequences corresponding respectively to said separate channels;
• first switch means connected to said deinterleaving means;
• a buffer memory connected to said first switch means;
• second switch means connected to said buffer memory;
• interleaving means having two inputs connected to said second switch means and an output connected to said non-ISDN terminal equipment;
• and
• control means responsive to said first and second frame sequences for controlling said first and second switch means and said buffer memory so that an earlier one of said first and second frame sequences is stored into said buffer memory until the other frame sequence arrives and read therefrom to one of the inputs of said interleaving means and the other frame sequence is supplied to the other input of said interleaving means.