Terms used as applied to Data (and some Voice) Transmission over Copper Wire

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HDSL (High data rate Digital Subscriber Line) -- HDSL, simply stated, a better way of transmitting high speeds (300Kbps up), even T1 or E1 speeds, over existing twisted pair copper lines utilizing two pairs (4 Wires). It uses less bandwidth and requires no repeaters. Using more advanced modulation techniques, HDSL has boasted capability to transmit 1.544 Mbps or 2.048 Mbps in bandwidths ranging from 80 kHz to 240 kHz, depending upon the specific technique. HDSL provides such rates over lines up to 12,000 feet in length (on 24ga copper) See: SDSL

HDSL-2 (High speed Digital Subscriber Loop <2wire>) - A proposal to the American National Standards Institute (ANSI) for a unified suite of line codes, modulation and error-correction standards for the emerging single-pair HDSL standard. Some contending modulations for the standard are CAP/QAM and OPTIS. Some for of OPTIS will most likely become the final standard.

Host-Any computer on a network that is a repository for services available to other computers on the network. It is quite common to have one host machine provide several services. See: Node , Network

HSSI (High Speed Serial Interface) -- A very general acronym referring to a digital serial port which supports speeds of up to 52 megabits per second. It is a term typically used with devices that resided on high speed dedicated lines such as DS3 (44.736 Mbps) and E3 (34 Mbps). HSSI interfaces are used on Wide Area Network devices such as routers. V.35 could be considered a type of HSSI interface.


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