Synchronization of V42bis de/compression for V34/V42 modem relay method and apparatus

摘要: Method and apparatus for synchronizing two de/compression modems, e.g. V.42bis in a voice frame network, the modems each being connected with corresponding gateway to form segment, are described. The method includes terminating physical layer at either end of gateways; negotiating error-correcting data link modem; sending from an associated modem response any poll command therefrom not-ready message; signaling other when negotiations have been completed; has signaled that completed, halting message-sending instead ready message modem, whereby synchronized compressed decompressed transmissions between commences on reliable transport. Preferably, thereafter, upon occurrence destructive break condition or receipt initiate transfer command, such is relayed segment where it detected thereby maintaining synchronization modems. messages commands compliant ITU-T V.42 protocol.