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Appendix A: 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 portio
a
nd one or more bits of the local portion. Sometimes it called subnet mask.
AAL5
A
TM Adaptation Layer - This layer maps higher layer user data into ATM cells, making the
data suitable for tra
ADSL
A
symmetric digital subscriber line
ATM
Asynchronous Transfer M
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 o
B
ridge
A device connec
ts 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
C
haracteristic 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 s
where a copy of a given packet
E
thernet.
CO
C
entral Office. Refers to equipment located at a Telco or service provider's office.
CPE
Customer Premises Equipment located in a user's p
n of the Internet address
nsport through the ATM network.
ode - A cell-based data transfer technique in which channel
is given to all hosts attached to the network. Example:
f thickness of a wire
remises
111
ystem
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