ADC CRA-C User Manual
Page 82
Glossary
74
Megabit Modem CRA-C User Manual
CAP
Carrierless Amplitude Phase Modulation. A two-
dimensional line code used in ADSL.
Crosstalk
Line noise that occurs due to coupling of signals
between pairs in the same bundle.
Downstream
The direction of data reception from the Megabit
Modem CRA-C to a remote unit.
Ethernet
A baseband LAN specification that has become a
series of standards produced by IEEE referred to as
IEEE 802.3.
HDLC
High-level Data Link Control.
Hub
A common wiring point for star-topology networks,
and a common synonym for a concentrator.
IEEE
Institute of Electrical and Electronics Engineers.
A professional organization that defines network
standards.
I/F
Interface or Interface Card.
ISP
Internet service provider.
kbps
Kilobits per second. A measure of transmission
speed at 1,000 bits per second.
kpps
Kilo packets per second.
LAN
Local Area Network. The means by which a local
community of users and workgroups can share
information and resources electronically.
LED
Light emitting diode.
Line code
Any method of converting digital information to
analog form for transmission on a communicaton
line.
Link
Another term used for transmission line.
MAC
Media Access Control. Associated with Layer 2
or the Data Link Layer of the ISO 7-layer
protocol model.
Margin
An ADSL parameter, measured in dB. It indicates
the excess SNR, relative to the performance of 10
–7
BER, at the receiver point.