Cisco ATA 190 Administration Manual page 67

Numerics
10-Mbps baseband Ethernet specification using two pairs of twisted-pair cabling (Categories 3, 4, or
10BaseT
5): one pair for transmitting data and the other for receiving data. 10BASET, which is part of the
IEEE 802.3 specification, has a distance limit of approximately 328 feet (100 meters) per segment.
A
ITU-T companding standard used in the conversion between analog and digital signals in PCM
A-law
systems. A-law is used primarily in European phone networks and is similar to the North American
µ-law standard. See also companding and µ-law.
Out-of-bound signaling as defined in RFC 2833.
AVT tones
C
One of five grades of UTP cabling described in the EIA/TIA-586 standard. Category 3 cabling is used
category-3 cable
in 10BaseT networks and can transmit data at speeds up to 10 Mbps.
Called station identification. A three-second, 2100 Hz tone generated by a fax machine answering a
CED tone detection
call, which is used in the hand-shaking used to set the call; the response from a called fax machine to
a CNG tone.
code excited linear prediction compression. Compression algorithm used in low bit-rate voice
CELP
encoding. Used in ITU-T Recommendations G.728, G.729, G.723.1.
Calling Line Identification Presentation. Shows your identity to callers with Caller ID.
CLIP
Calling Line Identification Restriction. Hides your identity from callers with Caller ID.
CLIR
Comfort Noise Generation
CNG
coder decoder. In Voice over IP, Voice over Frame Relay, and Voice over ATM, a DSP software
codec
algorithm used to compress/decompress speech or audio signals.
Contraction derived from the opposite processes of compression and expansion. Part of the PCM
companding
process whereby analog signal values are rounded logically to discrete scale-step values on a nonlinear
scale. The decimal step number then is coded in its binary equivalent prior to transmission. The process
is reversed at the receiving terminal using the same nonlinear scale. Compare with compression and
expansion. See also a-law and µ-law.
OL-31821-01
Cisco ATA 190 Analog Telephone Adaptor Administration Guide for SIP (Version 1.0)
G L O S S A R Y
GL-1