ADC MM701G2, MM702G2 user manual Glossary, Symbol

GLOSSARY

Symbol

10/100Base-T– The Institute of Electrical and Electronic Engineers (IEEE) 802.3 specification for Ethernet over thin coaxial cable.

A

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.

ADSL – Asymmetric Digital Subscriber Line

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.

BERBit Error Rate is a measure of transmission quality. The ratio of error bits to the total number of bits transmitted.

B

bps – bit-per-second is the number of bits transferred during each second of data transmission.

C

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.

D

DHCP – Dynamic Host Configuration Protocol. A TCP/IP protocol that enables PCs to obtain IP addresses from a DHCP server that dynamically assigns IP addresses.

DNS – Domain Naming System. A system for translating names of host computers into IP addresses. downstream traffic – Communications from a service provider to a user.

E

encapsulation – The inclusion of data in a protocol header prior to transmission, which enables successful data transmission between different protocol networks.

ES – Errored Seconds is the seconds during which errors occur that prevent the payload from being corrected. Ethernet – A protocol used for LAN traffic, which has a transfer rate of 10 or 100 Mbps.

F

flash memory – Non-volatile memory that can be erased and reprogrammed.

G

G.shdsl – Symmetrical High-Speed Digital Subscriber Line

MM70xG2-UM-03 GL-1