ADSL2+ Ethernet Modem
HRDSL524
62
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).