Triz TZ6100i, User Manual

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BDSL
Same as VDSL.
Binder Group
Cable pairs are typically arranged under the cable sheath in binder groups. The binder
is a spirally wound colored thread or plastic ribbon used to separate and identify cable
pairs by means of color-coding. The enclosed pair group is called a binder group. The
groups are composed of insulated twisted copper pairs that are also twisted within each
binder. Typically they are wrapped in 25 pair bundles. For example, pairs 1-25 might be
in one binder group and pairs 26-50 in another. In xDSL, one often hears discussions of
signal interference between adjacent pairs within a binder group. The best of all worlds
is to keep a data pair separated from another data pair by assigning it to an adjacent
bindergroup. If the data pairs are too close to each other they create what telcos call
"disturbers" (i.e., crosstalk). If a "disturber" exists in the binder group serving your SNI,
NID, MPOE, etc., you may not "qualify" for DSL service.
B-ISDN (Broadband Integrated Services Digital Network)
A digital network with ATM switching operating at data rates in excess of 1.544 or 2.048
Mbps. ATM enables transport and switching of voice, data, image, and video over the
same infrastructure.
Bit
A contraction of "binary digit." A bit is the smallest element of information in the digital
system.
Bridge Tap
A sometimes-accidental connection of another local loop to the primary local loop.
Generally it behaves as an open circuit at DC, but becomes a transmission line stub
with adverse effects at high frequency. It is generally harmful to DSL connections and
should be removed. Extra phone wiring within one's house is a combination of short
bridge taps. A POTS splitter isolates the house wiring and provides a direct path for the
DSL signal to pass unimpaired to the ATU-R modem.
CAP (Carrierless Amplitude/Phase)
A two-dimensional passband line code derived from quadrature-amplitude modulation.
Category 3 Cabling
A rating for twisted pair copper cabling that is tested to handle 16 MegaHertz of
communications. Handles 10 Mbps of LAN traffic and is commonly used as telephone
wiring.
Category 5 Cabling
A rating for twisted pair copper cabling that is tested to handle 100 MegaHertz of
communications. CAT-5 cable is generally required for higher-speed data
communications, such as Ethernet LANs.
CATV (Community Access Television)
Also known as Cable TV.