ADC 410F, User Manual

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Megabit Modem 410F and 420F User Manual 87
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LOSSARY
This glossary defines terminology from the perspective of the Megabit Modem 410F and 420F.
10/100BASE-T The Institute of Electrical and Electronic Engineers (IEEE) 802.3 specification for
Ethernet over thin coaxial cable.
ADSL Asymmetric Digital Subscriber Line is a technology in which data is transferred from
the Megabit Modem 410F to the 420F at up to 7.552 Mbps, and transferred from the
420F to the 410F at up to 928 Kbps. ADSL is the implementation of the physical layer
for transmission of data.
attenuation The dissipation of the power of a transmitted signal as it travels over copper wire,
measured in decibels (dB).
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.
community
string A text string required for an SNMP trap to be received by a trap receiver(s). Also, a
text string that identifies an SNMP community and is associated with specific access
rights (read-only or read/write).
CRC Cyclic Redundancy Check is a method used to verify the accuracy of data
transmission.