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RFC 1483
Multi-protocol encapsulation over AAL-5. Two encapsulation methods for carrying network
interconnect traffic over ATM AAL-5. The first method allows multiplexing of multiple protocols over
a single ATM virtual circuit. The protocol of a carried PDU is identified by prefixing the PDU by an
IEEE 802.2 Logical Link Control (LLC) header. This method is in the following called "LLC
Encapsulation". The second method does higher-layer protocol multiplexing implicitly by ATM
Virtual Circuits (VCs). It is in the following called "VC Based Multiplexing".
Router
A system responsible for making decisions about which of several paths network (or Internet) traffic
will follow. To do this, it uses a routing protocol to gain information about the network and algorithms
to choose the best route based on several criteria known as "routing metrics.
Spanning Tree
Spanning-Tree Bridge Protocol (STP). Part of an IEEE standard. A mechanism for detecting and
preventing loops from occurring in a multi-bridged environment. When bridges connect three or
more LAN segments, a loop can occur. Because a bridge forwards all packets that are not
recognized as being local, some packets can circulate for long periods of time, eventually degrading
system performance. This algorithm ensures only one path connects any pair of stations, selecting
one bridge as the 'root' bridge, with the highest priority one as identifier, from which all paths should
radiate.
TELNET
The virtual terminal protocol in the Internet suite of protocols. Allows users of one host to log into a
remote host and act as normal terminal users of that host.
VCI
Virtual Circuit Identifier. Part of the ATM cell header, a VCI is a tag indicating the channel over which
a cell will travel. The VCI of a cell can be changed as it moves between switches via Signaling.
VPI
Virtual Path Identifier. Part of the ATM cell header, a VPI is a pipe for a number of Virtual Circuits.
WAN
Wide area network. A data communications network that spans any distance and is usually provided
by a public carrier (such as a telephone company or service provider)
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