ATL User Guide
AM2 G.SHDSL Modem
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Frame Relay A high-speed packet-switching protocol used in wide area networks (WANs). Frame
Relay provides for a granular service up to DS1 rates
G.703 Refers to the ITU-T Recommendation for physical and electrical characteristics of
hierarchical digital interfaces. The general standard for interfacing to digital high-
speed circuits.
G.704 ITU-T Recommendation applies to the frame structure of a 1.544-Mbps and 2.048-
Mbps. G.703 digital link using multiple 64-kbps time slots as individual sub-channels.
G.SHDSL This is a worldwide standard aimed at users of DSL for voice, data and Internet access
services and is currently determined by ITU-T recommendation G.991.2. G.SHDSL is
a symmetrical high-speed digital subscriber line technology. It is rate adaptive and
spectrally friendly with other DSL systems such as ADSL. It supports data rates from
192kbps to 2.3 Mbps at greater distances than many other technologies.
Handshaking Exchange of predetermined signals between two devices establishing a connection.
Usually part of a communications protocol.
HDSL High bit rate Digital Subscriber Line
HTML Hypertext Markup Language
HTTP Hypertext Transfer Protocol
Hub A central connecting device that joins communication lines together in a star
configuration.
Hz (Hertz) A unit of frequency. One hertz equals one cycle per second.
ICMP (Internet Control Message Protocol) This is an adjunct to IP, and provides the ability
to exchange error and control messages between local and remote hosts or routers
IEEE Institute of Electrical and Electronics Engineers
IEEE 802.2 IEEE LAN protocol specifying an implementation of the LLC sub layer of the Data-Link
Layer. It handles errors, framing, flow control, and the Network Layer (Layer 3) service
interface. This protocol is used in IEEE 802.3 and 802.5 LANs.
IEEE 802.3 This is a standard specification for Ethernet, a method of physical communication in
a local area network (LAN), which is maintained by the Institute of Electrical and
Electronics Engineers (IEEE). In general, 802.3 specifies the physical media and the
working characteristics of Ethernet.
IP (Internet Protocol) This is a standard protocol widely used for internetworking. IP
messages carry data from an originating computer to a destination computer,
possibly passing though routers. The term "IP" is often used to refer to the collection
of protocols usually used with IP itself. Some of these are ICMP, ARP, RIP, SNMP, TCP,
TELNET and UDP. IP is defined in RFC-791.
