V.92 is an ITU-T recommendation, titled Enhancements to Recommendation V.90, that establishes a modem standard allowing near 56 kbit/s download and 48 kbit/s upload rates. V.92 was first presented in August 1999. It is intended to succeed the V.90 standards. With V.92 PCM is used for both the upstream and downstream connections; previously 56K modems only used PCM for downstream data. The ITU Telecommunication Standardization Sector (ITU-T) coordinates standards for telecommunications on behalf of the International Telecommunication Union (ITU) and is based in Geneva, Switzerland. ... A modem (a portmanteau word constructed from modulator and demodulator) is a device that modulates a carrier signal to encode digital information, and also demodulates such a carrier signal to decode the transmitted information. ... 56K modems are analog modems capable of speeds near 56 kbit/s when connecting to a service that has a digital connection to the phone network. ... Note: as an adjective (stressed on the second syllable instead of the first), august means honorable. ... 1999 (MCMXCIX) is a common year starting on Friday, and was designated the International Year of Older Persons by the United Nations. ... V.90 is an ITU-T recommendation for a modem, allowing 56 kbit/s download and 33. ... Pulse-code modulation (PCM) is a digital representation of an analog signal where the magnitude of the signal is sampled regularly at uniform intervals, then quantized to a series of symbols in a digital (usually binary) code. ...

New features

Quick Connect

This reduces negotiation times to around 10 seconds instead of over 20 seconds. Quick connect works by training the client modem on the first call; analog and digital characteristics are stored in a local profile and then retrieved for future connections.

"Modem on Hold" (MOH)

This allows the connection to be temporarily severed and then reconnected, reducing the possibility of dropped connections. This is particularly useful for lines that have call waiting.

PCM upstream

Pulse Code Modulation or PCM allows higher rate digital transmitions over the analog phone lines. PCM Upstream provides a digital connection for upstream data, reducing latency and allowing for a maximum upload speed of about 48 kbit/s. Previously this speed was only achieved in the downstream side in standards such as V.90. Pulse-code modulation (PCM) is a modulation technique. ... V.90 is an ITU-T recommendation for a modem, allowing 56 kbit/s download and 33. ...

V.44 compression

V.44 compression replaces the existing V.42bis compression standards. It generally allows for between 10 and 120% better compression. In most situations the improvement is around 25%. V.44 is an adaptive data compression standard incorporated into the v. ... V.42bis is an adaptive data compression standard in common use nowadays. ...

External link

• V92.com
• Recommendation V.92, amendments and corrigendum

V.90 is an ITU-T recommendation for a modem, allowing 56 kbit/s download and 33. ...

See also

• K56flex
• X2 (Chipset)