AC4830xC-C Data Book
Chapter 2. Functional Description
Revision 1.0
11
March 2000
2
FUNCTIONAL DESCRIPTION
2.1 Overview
The AC4830xC-C voice processor family supports one or two low-bit-rate voice, fax or
data transmission channels. For voice transmission, the analog input is digitized using
an external PCM codec, input through the AC4830xC-C PCM interface, and
compressed to one of the supported bit rates. Fax transmissions are automatically
detected and demodulated by the integrated NetFax
®
Engine. Data transmissions are
detected and cause the AC4830xC-C to switch to PCM mode. The AC4830xC-C
transfers the resultant bit-stream (compressed voice or demodulated fax for all the
channels) in packets to the Host processor through the integral Host Port Interface.
The AC4830xC-C performs receive and transmit operations simultaneously. It receives
compressed, packetized speech data from a remote AC4830xC-C unit, through the Host
Port Interface. It decompresses speech data and transmits it through the PCM voice
interface. It also remodulates and transmits fax signals to the fax machine in analog
form. The fax relay process is transparent for the transmitting and the receiving fax
machines.
Many other built-in features support use of the AC4830xC-C in a wide range of
integrated voice, fax and data access, transmission and switching systems.
The features include voice activity detector (VAD), comfort noise generator (CNG) and
adaptive Echo Canceler. Additionally, both In-band Signaling (Detection and
Generation of: MF-R1, MF-R2, SS-4, SS-5, DTMF tones, Call Progress tones, User-
defined tones) and Channel Associated Signaling (E&M: A and AB) are provided.
Figure
2-1 on page 12 is a simplified Application Diagram for each of the AC4830xC-C
channels.
Содержание AC4830 C-C Series
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