发明名称 Förbättringar av eller avseende dataöverföring
摘要 A modem capable of transmitting data at a rate substantially greater than 28.8kb/s over a telephone network can be constructed by arranging for the modem output to be a series of analogue voltage levels which convert to a PCM data stream identical to the incoming data stream. A data transmission system using the present invention, includes a first modem and a second modem and a telephone network having a PCM telephone transmission link. Each modem includes: combining means adapted to combine an incoming data stream into bytes; and a digital to analogue convertor adapted to convert said bytes into a series of analogue voltage levels. The series of analogue voltage levels can be transmitted over an analogue transmission link to a PCM analogue to digital convertor, which may be located in a telephone exchange. The data transmission system is so arranged that a PCM output signal from said PCM analogue to digital convertor substantially replicates said incoming data stream. <IMAGE>
申请公布号 SE515760(C2) 申请公布日期 2001.10.08
申请号 SE19960003532 申请日期 1996.09.27
申请人 TELIA AB 发明人 MAGNUS *KRAMPELL
分类号 H04L25/49;(IPC1-7):H04M11/06 主分类号 H04L25/49
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