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DSL GlossaryADSL - Asymmetric Digital Subscriber Line. ADSL is a form of DSL that is widely deployed by the telephone companies and enables fast data transmissions over copper telephone lines. This form of DSL is primarily targeted for residential markets. Bandwidth - Refers to the capacity of a medium to transmit information. Baud rate - Refers to the number of signaling elements to the transmission media per second in a modulated signal. Bit - Abbreviated term for a binary digit - the smallest unit of information in a binary number system. Eight bits equals one byte or character. BPS – Abbreviation for Bits Per Second - The speed at which bits are transmitted. Used to describe modem transfer speeds. Byte – a unit of measurement equaling 8 bits or one character. Broadband - A type of data transmission in which a single medium can transfer multiple signals at once. Ex.. cable internet, DSL, satellite internet. Dial-up – Refers to a method of internet connection that uses telephone lines to submit data. Maximum modem speed with dial-up service is 56K, however throughput is limited to a maximum of 53.333 kbps per FCC regulations. DSL –Stands for digital subscriber line. A DSL connection uses a traditional telephone line to transmit and receive data. Download speeds on a DSL connection typically range from 1.5 M to 3.0 M G.lite - Refers to residential DSL service with speeds of 1.5 mbps downstream and 384 kbps upstream. IDSL - ISDN Digital Subscriber Line. Speeds up to 144kbps are delivered without the usage charges inherent with ISDN service. SDSL - Symmetrical Digital Subscriber Line. A symmetrical DSL connection with data transfer speeds from 1.5 Mbps to 192 Kbps. ISDN - Integrated Services Digital Network. Considered a high speed dial-up connection that can support data transfer speeds up to 128 Kbps. ISP - Internet Service Provider. An ISP provides internet access through services such as DSL, dial up, cable internet, satellite, etc. Examples of ISPs are Qwest, Verizon, America Online, Comcast, Time Warner Road Runner, etc... Kbps - Stands for Kilobits per second. Most dial-up connection speeds are measured in Kbps. For example, mot dial-up modems are made with Kilobits of 28.8 Kbps (or 28.8K) and 56.0 Kbps (or 56K). VDSL -Very high bit rate DSL. Data transfer speeds of up to 26 M up to 50 meters on short loops such as from fiber to the curb. VDSL lines well suited for use with college universities and business districts. |
