BreezeMAX Si 2000 CPE User Manual - Alvarion

Chapter 7 - VoIP Settings
Codecs
7.6 Codecs
A codec (coder/decoder) is the way a voice analog signal is converted into a digital
bitstream to send over the network, and how it is converted back into an analog
signal at the receiving end. Codecs differ in the type of data compression that is
used to save network bandwidth and in the time delay caused in the signal. This
results in different voice quality experienced by the user.
The voice codecs in common use today have been standardized by the
International Telecommunication Union Telecommunication Standardization
Sector (ITU-T) and are identified by a standard number, such as G.711 or G.726.
The same codec must be supported at each end of a VoIP call to be able to encode
and decode the signal. Since devices in other networks may want to use different
codecs, the BreezeMAX Si provides support for several common standards.
NOTE
The Codecs page is only available in Operator mode
Figure 7-8: VoIP Codec Settings
• Codec – Lists the codecs supported by the BreezeMAX Si 2000. You can
enable specific codecs to use, or enable all. Alternatively, you may want to
disable certain codecs, such as high-bandwidth codecs, to preserve network
bandwidth.
» PCMA (G711.aLaw): The ITU-T G.711 with A-law standard codec that uses
Pulse Code Modulation (PCM) to produce a 64 Kbps high-quality voice data
BreezeMAX Si 2000 CPE 95 User Manual