W300D Wireless-N ADSL2+ Router
megabytes)
per second, and to send (upload)
data at speeds of 128 kilobits per second.
Thus the "Asymmetric" part of the acronym.
ATM：
ATM stands for Asynchronous Transfer Mode.
A transmission protocol that breaks down
user traffic into small fixed-sized cells, before
reassembling them after transmission.
During transmission, cells from different
users are asynchronously intermixed,
thereby maximizing network resources. The
ATM advantages voice and video stream and
data transmission in single network.
VPI：
Stands for "Virtual Path Identifier." The VPI is
an 8-bit header inside each ATM cell that
indicates where the cell should be routed. It
is used to identify the virtual path (a bundle
of virtual channels that have the same
endpoint) to which the cell belongs as it
travels through an ATM network. As an ATM
cell moves across a network, it typically
passes through several ATM switches. The
VPI tells the switches where to route the
packet of information, or what path to take.
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