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- Glossary(19)
- Terms used as applied to Data
(and some Voice) Transmission over Copper Wire
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- HDSL
- HDSL-2
- Host
- HSSI
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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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