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T1/T3
TCP/IP
telnet
thread
throughput
timeout |
T1/T3
The big-time phone lines leased by big companies,
universities, and the government for high-speed
Net access and large-scale phone service are called
T1s or T3s, depending on the line's capacity. T1
lines, theoretically, carry data at a maximum 1.544Mbps.
While that's blazingly fast compared to your modem's
28.8Kbps crawl (1.544 Mbps is 1,544Kbps), T1s will
still drop frames if you're trying out full-screen,
full-motion teleconferencing. T3 lines, on the other
hand, are rated at 44Mbps, which will do fine for
that full-screen video, and leave plenty of room
for sending and receiving the latest e-mail gossip.
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TCP/IP
As you cruise the Web you'll find pages in
English and French and Swedish and all sorts of
human languages, but the computers on the Web
speak just one language. That's TCP/IP. TCP/IP
is the basic language (set of rules, if you prefer)
by which all Internet computers talk to each other
and send the tiny chunks of information that make
up a Web page (or anything else online). To get
onto the Net, your computer needs to have a little
understanding of TCP/IP; that's called its TCP/IP
stack. TCP/IP stands for Transmission Control
Protocol / Internet Protocol.
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telnet
Telnet is a way by which you can log into
a computer that you're not sitting in front of.
For instance, say you have an Internet account
at yourhome.com, but you're out of town and yourhome.com
is a long-distance call away. If yourhome.com
allows people with accounts to log in via telnet,
you could get onto another computer on the Net
and telnet to the yourhome.com computers and log
in to check your mail or use special features
that only yourhome.com users have access to.
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thread
A thread is a multi-part virtual conversation
on a given topic. Threads can exist in Usenet
newsgroups, in the forums of an online service,
or in the form of a series of e-mails. Within
a given topic -- say, "Washington lobbyists"
-- several conversations, or threads, may be active
at any given time, much like the separate, simultaneous
conversations at a cocktail party. In the case
of Usenet and online service forums, generally
the post which started the conversation (or fight,
more often than not), is listed first, with responses
from other participants following it, responding
to either the original post or other's responses.
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throughput
Throughput is just another word for "communications
speed." If you uploaded a megabyte in 10
minutes, the throughput would have been 13,981
bits per second -- close to the best-case throughput
of a 14.4Kbps modem, but relatively slow by modern
standards.
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T.I.L.E.
- Technologically
Integrated Learning Environment - A state grant
awarded to District 108 that focused on restructuring
our classrooms using technology.
time
out
The next time someone calls you, pick up the
phone, but don't say anything. You may hear a
tentative hello or two, and perhaps a swear or
two, before the calling party slams down the receiver.
This is the human equivalent to a server's time-out
-- with you playing the server, and your unwitting
ex-friend playing the part of the hapless Internet
user. When you dial into your ISP, your communications
software is programmed to wait a certain number
of seconds for a response after the line is picked
up. If your ISP does not respond in time and initiate
the modems' "handshake," your computer
gets wise and hangs up. The other occurrence of
timing out has to do with surfing the Web. Much
like when you dial your ISP, when you request
a Web page by clicking on a link, the server housing
the page you requested has to respond. If it doesn't
do so in a certain amount of time, you may get
a "connection timed out" message from
your browser.
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