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MM701G and MM702G User Manual 149
D
GLOSSARY
10Base-T
The Institute of Electrical and Electronic Engineers (IEEE) 802.3 specification for
Ethernet over thin coaxial cable.
AAL2
ATM Adaptation Layer 2. Used for compressed voice and video that is intolerant of
delay. This layer is used by xDSL technology.
AAL5
ATM Adaptation Layer 5. AAL5 has been adopted by the ATM Forum from a Class of
Service called High Speed Data transfer. It typically supports all types of data traffic.
Originally designed to support TCP/IP.
ATM
Asynchronous Transfer Mode is a high bandwidth, low delay, connection-oriented,
packet-like switching and multiplexing technique that uses 53-byte fixed-size cells to
transmit voice, video and data over a network. ATM layers define how cells are
formatted and provides the transport of the fixed length cells between the modem
and the service provider (or endpoints of the virtual connection).
attenuation
The dissipation of the power of a transmitted signal as it travels over copper wire,
measured in decibels (dB).
authentication
Security feature offered through PAP and CHAP with PPP sessions.
BER
Bit Error Rate is a measure of transmission quality. The ratio of error bits to the total
number of bits transmitted.
bps
bit-per-second is the number of bits transferred during each second of data
transmission.
CBR
Constant Bit Rate is a Service Class for the modem. It provides constant bit rate data
with a timing relationship between the source and the destination. Also, a traffic class
that carries a guaranteed constant bandwidth. Best suited for applications that require
fixed bandwidth, such as uncompressed voice, video and circuit emulation. CBR is a
Quality of Service class defined by the ATM Forum for ATM networks.
cell
A fixed-length packet. Also, the unit of data transmission used in ATM. Each ATM cell
contains a fixed-size frame (53 bytes) consisting of a five-byte header and a 48-byte
payload.