Chapter 13 Authority Group
X2002 User’s Guide
223
13.4 Authority Group Technical Reference
This section contains technical background information about the
Authority
Group
screens.
Voice Codecs
A codec (coder/decoder) codes analog voice signals into digital signals and
decodes the digital signals back into voice signals. The following table describes
the codecs supported on the X2002
Table 68
Voice Codecs Supported
CODEC
DESCRIPTION
G.711
This is a Pulse Code Modulation (PCM) waveform codec. PCM measures
analog signal amplitudes at regular time intervals (sampling) and converts
them into digital bits (quantization). Quantization "reads" the analog signal
and then "writes" it to the nearest digital value. For this reason, a digital
sample is usually slightly different from its analog original (this difference is
known as "quantization noise").
G.711 provides excellent sound quality but requires 64kbps of bandwidth.
There are two main algorithms defined in the G.711 standard, the µ-law
algorithm (used in North America & Japan) and a-law algorithm (used in
Europe and the rest of the world).
G.722
(pass-
through)
G.722 is an ADPCM codec (see G.726) working at 48 ~ 64 Kbps, with an
audio sample rate of 16 KHz. G.722 provides excellent sound quality.
Note: The X2002 supports G.722 pass-through, meaning that devices
communicating via the X2002 must support this codec.
G.722
AMR-WB
(pass-
through)
(also
referred to
G.722.2)
G.722.2 is similar to G.722, but with a lower compression rate that can vary
according to the amount of available bandwidth. When there is plenty of
bandwidth, the compression ratio decreases, and when there is network
congestion the compression ratio increases. This is also known as Adaptive
Multi Rate - WideBand (AMR-WB).
Note: The X2002 supports G.722.2 pass-through, meaning that devices
communicating via the X2002 must support this codec.
G.723.1
This is an ITU (International Telecommunication Union) standard for voice
coding. The G.723.1 codec compresses voice audio in 30 ms frames. The
G.723.1 operates at two bitrates: 6.3 kbps when sampling at 24 bytes or 5.3
kbps when sampling at 20 bytes per 30 ms frame.
Summary of Contents for X2002
Page 2: ......
Page 24: ...Table of Contents X2002 User s Guide 24...
Page 25: ...25 PART I User s Guide...
Page 26: ...26...
Page 40: ...Chapter 2 How It Works X2002 User s Guide 40...
Page 99: ...99 PART II Technical Reference...
Page 100: ...100...
Page 124: ...Chapter 5 Network Deployment X2002 User s Guide 124...
Page 166: ...Chapter 7 Auto Provision X2002 User s Guide 166...
Page 170: ...Chapter 8 QoS X2002 User s Guide 170...
Page 248: ...Chapter 16 Click To Talk Group X2002 User s Guide 248...
Page 252: ...Chapter 17 Group Access Code X2002 User s Guide 252...
Page 304: ...Chapter 19 Auto Attendant X2002 User s Guide 304...
Page 312: ...Chapter 20 LCR X2002 User s Guide 312...
Page 346: ...Chapter 22 Call Services X2002 User s Guide 346...
Page 380: ...Chapter 25 Status Observation X2002 User s Guide 380...
Page 402: ...Chapter 27 Call Detail Record CDR X2002 User s Guide 402...
Page 410: ...Chapter 28 ACD Logs X2002 User s Guide 410...
Page 416: ...Chapter 29 Administrator Accounts X2002 User s Guide 416...
Page 424: ...Chapter 30 Diagnostics X2002 User s Guide 424...
Page 426: ...Chapter 31 X2002 User s Guide 426...
Page 446: ...Chapter 32 Remote Management X2002 User s Guide 446...
Page 448: ...Chapter 33 TFTP Management X2002 User s Guide 448...
Page 462: ...Chapter 35 License Control X2002 User s Guide 462...
Page 482: ...Chapter 36 Web Portal X2002 User s Guide 482...
Page 508: ...Chapter 39 Product Specifications X2002 User s Guide 508...
Page 548: ...Appendix C Legal Information X2002 User s Guide 548...
Page 562: ...Index X2002 User s Guide 562...