How High Speed Dial-up Works Faster than Standard Dial-up
1. Change Dial-up connecting
If we feel internet speed is slow, it may
depend on Dial-up connecting.
Dial-up’s speed is restricted by the bandwidth
of phone.
Now, almost connecting uses another
connecting method with Dial-up - broadband
connecting. But it needs a lot of time.
There is a new technology “Hight speed Dial-
up”.
2. Handshake of high speed Dial-up.
When we start communication, both of sender
and receiver have to do handshake.
Standard connecting is doing too many
communication. So, high speed Dial-up cuts
some communication and handshake become
shorter.
This way, we can cut 50% handshake
maximum. And taking time that sender
connect with receiver become 1 of 1~9.
3. About compression technology
One of important element of high speed Dial-
up is file compression.
If we do file compression, communication
speed becomes faster.
Two types file compression are used now.
One of them is lossy compression. This way
cut unwanted information. So, we can’t return
before condition.
Another one is lossless compression. This
way can return before condition.
4. How Filtering works
When we see web page, we may see some
advertisements.
Step of getting these advertisements data
contains whole communication steps. So,
advertisements make communication to slow.
High speed Dial-up provider cuts
advertisements data automatically.
As a result, we can see some web page more
quickly than before.
5. How Caching works
When we see web page that we have ever
been, then communication is unwanted.
Provider cuts communication steps if we have
ever been the page and it hasn’t changed.
When get web page data, provider check
them and compare with cache.
Cache is data that is information of web pages
which have ever been.
By present page’s data compare with cache,
we can know whether the page has changed.
6. Experiment of high speed
We don’t know how does high speed Dial-up
become faster. So, experiment is done.
This experiment used one of high speed Dial-
up provider - NetZero.
We measure communication both speed of
standard and high speed.
At last, we understand high speed Dial-up is
three times faster than standard.
