Modem Blaster V92 DE5621 External (Serial Port) V.44 compression is designed specifically for the Internet to provide faster access to Web pages and maximizes the efficiency of data retrieval QuickConnect shortens the connection time to the Internet by remembering the connection dialog with your ISP on the first call - making subsequent connections in half the time Modem-on-Hold allows you to place outgoing or receive incoming phone calls when you are on the Internet without disrupting your Internet connection PCM Upstream supports an upstream rate of up to 48 Kbps, dramatically reducing the upload time of data files and email attachments