V.92

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V.92 is an ITU-T recommendation, titled Enhancements to Recommendation V.90, that establishes a modem standard allowing near 56 kb/s download and 48 kb/s upload rates. With V.92 PCM is used for both the upstream and downstream connections; previously 56K modems only used PCM for downstream data.

V.92 was first presented in January 1996. It was intended to succeed the V.90 standards; however, with the spread of broadband Internet access, uptake was minimal.^{[citation needed]}

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.^{[citation needed]}

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 transmissions over the analog phone lines. PCM upstream provides a digital connection for upstream data, reducing latency and allowing for a maximum upload speed of 48 kbit/s. Previously the speed was limited to a 33.6 kbit/s analog signal under the previous V.90.

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%.^{[citation needed]}

See also[]

• Dial-up Internet access
• List of device bandwidths

External links[]

• ITU-T Recommendation V.92: Enhancements to Recommendation V.90
• ITU-T Recommendations: Series V