NetComm GATEWAY SERIES - Appendix C: Technology Glossary

ADSL2+ Modem Router User Guide YML14WN
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Appendix C: Technology Glossary
10Base-T
An adaptation of the Ethernet standard for Local Area Network (LAN). 10Base-T uses a twisted pair cable with maximum length of 100
meters.
AAL
ATM Adaptation Layer that denes the rules governing segmentation and reassembly of data into cells. Different AAL types are suited to
different trafc classes.
Address mask
A bit mask used to select bits from an Internet address for subnet addressing. The mask is 32 bits long and selects the network portion of
the Internet address and one or more bits of the local portion. Sometimes called subnet mask.
ADSL
Asymmetric Digital Subscriber Line, as it’s name showing, is an asymmetrical data transmission technology with high trafc rate
downstream and low trafc rate upstream. ADSL technology satises the bandwidth requirement of applications, which demand
“asymmetric” trafc, such as web surng, le download and Video-on-demand (VOD).
ATM
Asynchronous Transfer Mode is a layer 2 protocol supporting high-speed asynchronous data with advanced trafc management and quality
of service features.
bps
Bits per second. A standard measurement of digital transmission speeds.
Bridge
A device that connects two or more physical networks and forwards packets between them. Bridges can usually be made to lter packets,
that is, to forward only certain trafc. Related devices are: repeaters which simply forward electrical signals from one cable to the other, and
full-edged routers which make routing decisions based on several criteria.
CPE
Customer Premises Equipment, such as ADSL router, USB modem.
DHCP
Dynamic Host Conguration Protocol. Used for assigning dynamic IP address to devices on a network. Used by ISPs for dialup users.
DNS
Domain Name Server, translates domain names into IP
addresses to help user recognize and remember. However, the Internet actually runs on numbered IP addresses, DNS servers needs to
translate domain names back to their respective IP addresses.
DSL
Digital Line Subscriber (DSL) technology provides high-speed access over twisted copper pair for connection to the Internet, LAN
interfaces, and to broadband services such as video-on-demand, distance learning, and video conferencing.
FTP
File Transfer Protocol. The Internet protocol (and program) used to transfer les between hosts.
IPoA (RFC 1577)
Classical IP and ARP over ATM. Considers ATM congured as a Logic IP Sub-network(LIS) to replace Ethernet local LAN segments.
ISP
Internet service provider. A company that allows home and corporate users to connect to the Internet.