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User Manual of VC-230/230N
Appendix B: Glossary
Address mask
A bit mask 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 it called subnet mask.
VDSL
VDSL2 (Very High-Bit-Rate Digital Subscriber Line 2), G.993.2 is the newest and most advanced standard of
xDSL broadband wire line communications.
ADSL
Asymmetric digital subscriber line
AAL5
ATM Adaptation Layer - This layer maps higher layer user data into ATM cells, making the data suitable for
transport through the ATM network.
ATM
Asynchronous Transfer Mode - A cell-based data transfer technique in which channel demand determines
packet allocation. ATM offers fast packet technology,
real time, and demand led switching for efficient use of network resources.
AWG
American Wire Gauge - The measurement of thickness of a wire
Bridge
A device connects two or more physical networks and forward packets between them. Bridges can usually be
made to filter packets, that is, to forward only certain traffic. Related devices are repeaters which simply
forward electrical signals from one cable to the other and full-fledged routers which make routing decisions
based on several criteria.
Broadband
Characteristic of any network multiplexes independent network carriers onto a single cable. Broadband
technology allows several networks to coexist on one single cable; traffic from one network does not interfere
with traffic from another. Broadcast a packet delivery system where a copy of a given packet is given to all
hosts attached to the network. Example: Ethernet.
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