ASVD
Analog Simultaneous Voice And Data

Technology in order to do audio telephone call and data communication simultaneously with 1 telephone line.It is standardized by the advice,V.34Q of the International Telecommunication Union (ITU). In ASVD correspondence modem during data communication,it is possibleto do conversation by the telephone which is connected to modem. Being to be analog system,there is nonecessity of speech compression, priceof correspondencemodem is cheaper than DSVD of digital system.