- Wide Area Network. A data network that interconnects
multiple LANs across great distances through
Webcam - A video camera, usually attached
directly to a computer, whose current or latest image is
requestable from a Web site.
Webcasting - (push technology) is the
prearranged updating of news, weather, or other selected
information on a computer user's desktop interface
through periodic and generally unobtrusive transmission
over the World Wide Web (including the use of the Web
protocol on intranets).
Wideband - A
medium-capacity communications circuit/path. It usually
implies a speed from 64Kbps to 1.544Mbps.
Wink start signaling -
Method of supervisory signaling. CPE
signals offhook condition by sending a momentary pulse
to the CO. Contrast ground start and loop start.
Wire center - Any
point in a telecommunications network where the
network's wiring is exposed to provide access.
XDSL - An umbrella term used to describe an
emerging family of "digital subscriber line"
technologies. These technologies enable existing twisted
pair telco lines to become the transport mechanism for
multimedia and high-speed data transmission technologies
without impacting the Public Switched Telephone Network
or central office switch.
XMODEM - An error -correcting file transfer, data
transmission protocol used to transmit files between
PCs. The XMODEM protocol sends information in 128 byte
blocks of data. Some sums (check sums) are done on each
block and the result is sent along with the block. If
the result does not check out at the other end, the
computer at the other end sends a request ( a NAK -
negative acknowledgment ) to retransmit that block once
again. If the block checks out, the computer sends ACK (
an acknowledgment ). In this way, relatively error-free
transmission can be accomplished.
X.21 - Same as RS-449 with in-band dialing
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