Glossary of Terms

To use the glossary, click below on the first letter of the term you are interested in or scroll down this page.

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Backplane: A system bus residing on the motherboard of a card cage that connects to a series of connectors. Cards access the system bus by plugging into these connectors
Comfort Noise Insertion: Ability to inject artificial background noise where the Non-Linear Processor removes residual echo. This has the effect of greatly improving subjective speech quality of the echo canceller
CO: Central Office
CPE: Customer Premise Equipment
DCME: Digital Circuit Multiplication Equipment, this usually refers to satellite communications and multiplexers
Disable Tone Signal Detector: Ability to detect "disable tone" signals to bypass the echo canceller
Double-Talk Detector: Ability to detect the case when non-echo speech is present to freeze the echo canceller
DSP: Digital Signal Processor or Digital Signal Processing
Echo Tail: Refers to the length of an echo; usually measured in milliseconds (ms)
End Path Delay (EPD): A measure of the maximum delay the echo canceller can handle; usually measured in milliseconds (ms)
EMC: Electro Magnetic Compatibility
EMI: Electro Magnetic Interference
ETSI: European Telecommunications Standards Institute. A European standards body affiliated with the ITU
FCC:Federal Communications Commission. American Government telecommunications regulatory body
FRAD: Frame Relay Access Device. Also known as Frame Relay Assembler-Disassembler
ITU:International Telecommunications Union. A worldwide standards body located in Geneva, Switzerland
KTS:Key Telephone System
Narrow-Band Signal Detector:Ability to detect discrete "tones" or sinusoids to freeze the adaptive filter in the echo canceller. Examples of ìtonesî are DTMF signals and whistling.
Non-Linear Processor (NLP): A signal processing technique to remove residual echo that substantially improves subjective speech quality
PBX:Private Branch Exchange
PCS: Personal Communication System, this usually refers to a public digital cordless or wireless system
PCM: Pulse Code Modulation, this refers to digital coding of analog signals
PSTN: Public Telephone Network or Public Switched Telephone Network
QoS: Quality of Service
RSVP: Resource Reservation Protocol
RTCP: Real-time Transport Control Protocol

We hope you find this glossary useful, and we welcome your suggestions for additional terms. If you would like to submit a term please send it via the website feedback.


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