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Actually, a little research showed that a 56k modem uses PCM and PAM modulation schemes: http://www.eetimes.com/design/communications-design/4018048/An-Introduc

by quahada 14y ago

Actually, a little research showed that a 56k modem uses PCM and PAM modulation schemes: http://www.eetimes.com/design/communications-design/4018048/An-Introduction-to-the-V-90-56K-Modem http://www.eetimes.com/design/communications-design/4018048/... So primitive...