New Modem Standard v92
By Mark
'Winter' Jackson : Mar 21st 2001 : Page 2 of 3 |
"Faster uploads are
obviously the key improvement with the v.92 standard"
|
In order to better illustrate some of the key
changes in the new standard we've listed them below:
-Faster Upstream (Upload)
Transmissions
The v.90 standard limited you to 33Kbps due to only using an analogue
method instead of the 90's analogue/digital combo for downstream. The
redesign of the upstream modulation to accommodate the pulse code modulation
(PCM) codec, which converts analogue signals to digital, represents
the biggest change and required the greatest technological effort. This
now means that a theoretical maximum of 48Kbps is possible, although
44Kbps is the recognised standard.
-Quick Dial-Up Connect Initialise
(Handshake)
Up until now all modems have a tendency to be slow when communicating
the initial connection (dialling up). This is usually the part where
modems make those strange fuzzy sounds, as well as the speed at which
they physically dial the number. V.92 makes this almost as fast as ISDN
by assuming that each connection is from the same location. In reality,
the same phone lines connect repeatedly. Quick connect shortens a modem's
time to learn a phone line's characteristics by reusing some information
previously learned.
fact that not everybody needs
a 24/7 connection with super fast speeds.
-Modem-On-Hold
The modem-on-hold feature lets modems gracefully break a connection
and stand by while another call is taken. Clients can accept incoming
calls without crashing the connection, so users can access the Internet
or corporate network without missing telephone calls, or pause browsing
to make a call (with less need for second lines at home).
Used
in conjunction with quick connect, the modem-on-hold feature can make
resumption of the data call quicker and more seamless.
-v.44 Compression Protocol
Not an official part of v.92, but nevertheless included with 99.9% of
v.92 modems as standard. The v.44 compression protocol can achieve a
6:1 compression ratio, as opposed to the 4:1 compression ratio of its
predecessor, v.42bis. Depending on your data traffic, this means an
increase in data throughput and modem efficiency. Precompressed data,
such as JPEG images, won't benefit much, but text data, such as HTML,
will benefit from effective compression.
The four features above are the
primary additions, although such things as the v.59 diagnostic protocol
have also been included, yet aren't of any great interest. In summary
a fully supported v.92 modem and connection (ISP end) will allow you
to connect almost instantly, have very increased upload speeds, download
web pages MUCH faster (compression) and pause your connection in order
to talk on the phone.
Faster uploads are obviously the
key improvement with the v.92 standard and will help improve the following
areas and more:
-Voice-Over-IP (VoIP)
-E-Mail/Newsgroup/FTP etc. File Uploads
-Low Rate Video Conferencing
-Multiplayer Games
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