GLOSSARY C

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

A text string required for an SNMP trap to be received by a trap receiver(s). Also, a

string

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.

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