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56k modems are voiceband modems capable of download speeds near 56 kbit/s
(7 kbyte/s) when connecting to a service that has ISDN or other digital
connection to the phone network. The upload speed is usually limited to
33.6 kbit/s though the late arriving V92 standard increased this to 48
kbit/s. Due to the design of public telecommunications networks higher
speed dialup modems are unlikely to ever appear. Due to crosstalk
considerations, the FCC in the United States and CRTC in Canada have placed
a loudness limit on dial-up modems, resulting in a "speed limit" of 53
kbps. 56k modems can only work at 56K when there is only a single
pulse-code modulation step in the path between the modem and the digital
equipment at the provider. When this is not the case or when two 56k modems
are used to communicate with each other they will generally fall back to
33.6 kbit/s V32bis. 56 kbit/s transmission exploits the fact that most
telephone exchanges are interconnected with digit
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