ATL Telecom AM2 - Manual (Page 109)

ATL User Guide
AM2 G.SHDSL Modem
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Protocol A formal set of conventions governing the formatting and relative timing of message
exchange between two communicating systems.
QoS (Quality of Service) In traditional analogue systems the quality of the voice. In digital
systems, especially ATM, it is a set of parameters, which determine the performance
of a virtual circuit carrying voice, data and video.
Repeater A communications device that amplifies or regenerates the data signal in order to
extend the transmission distance.
RIP (Routing Information Protocol) This is the name for two related, but different,
protocols. One is used with IP and the other with IPX. Both are used to exchange
routing information with other routers. The IP version of RIP is defined in RFC-1058.
Router A Network layer device that stores and forwards data packets from one local area
network (LAN) or wide area network (WAN) to another using their network layer
information (IP addresses).
Routing The process that selects the most efficient path through a network for a message
SDSL Symmetrical Digital Subscriber Line
SNAP (Subnetwork Attachment Point) Part of the IEEE LLC/SNAP header used to identify
packet type.
SNMP Simple Network Management Protocol
Spanning tree A technique that detects loops in a network and logically blocks the redundant paths,
ensuring that only one route exists between any two LANs; used in an IEEE 802.1d
bridged network.
Static routes These are routes that have been permanently entered into a routing table. Static
routes are only affected by the relevant commands - they do not change
automatically.
Subnet This is a subdivision of an IP network. Subnetting is used to conserve the number of
IP network numbers required and to simplify routing. Subnets simply use a more
specific address mask than normal for the address class.
Synchronous/ Transmission in which data bits are sent at a fixed rate with the transmitter and
Transmission receiver synchronised.
SYSLOG A method of collecting together message logs from many systems. Each system sends
short text messages to a syslog recorder.
TCP (Transmission Control Protocol) TCP provides transport level connections between
hosts. It is designed to provide a reliable connection and handles error detection, lost
packets and packets that arrive out of sequence. It is also called "TCP/IP" because it
uses IP. TELNET uses TCP for its connections. TCP is defined in RFC-793.
TC-PAM (Trellis Coded Pulse Amplitude Modulation) Line code used on G.SHDSL lines
designed to be spectrally compatible with other transmission technologies deployed
in the access network, including other DSL technologies.