Z2 Controller Operations Manual
Z2C Installation and Operation Manual
6
Interoperability Now
Glossary
RX
Receiver or Receiving.
SIP
Session Initiation Protocol. A flexible, standards-based, open protocol that initiates and manages
communications between devices over an IP network. Often used to make VoIP calls.
Soft Phone
A computer with software allowing it to be used as a VoIP phone.
Squelch
A circuit or software that mutes the audio output of a radio receiver if the carrier signal strength
falls below a certain level.
STUN
Session Traversal Utilities for NAT. Standardized set of methods for detecting and traversing
network address translators (such as a router) between two endpoints of communication.
TX
Transmit or Transmitter.
URI
Uniform Resource Identifier. Unambiguous string of characters that identify a resource on a
network. (E.g. URL (Uniform Resource Locator) or web address.)
VMR
Voice Modulation Recognition. A form of audio presence detection based on the presence of
human speech and notably not by tones, noise, or other non-speech audio. It is typically used as a
gating mechanism for audio – when speech is detected by VMR, this allows the speech audio to
flow into or out of a device. VMR is particularly useful with noisy audio signals such as HF because
VMR will ignore most static and white noise.
VoIP
Voice Over Internet Protocol. Protocol for delivering voice communications over IP networks.
Most network-phone providers (such as Vonage), use VoIP.
VOX
Voice Operated Xmit (Transmit), or Voice Operated Switch. A form of audio presence detection
based on sound presence and volume. It is typically used as a gating mechanism for audio – when
sound exceeds a VOX threshold, this allows the audio to flow into or out of a device. The sound is
not restricted to voice only.
WAN
Wide Area Network. Connects local devices and LANs from multiple locations. A WAN may be
limited to a multi-site enterprise, for example, or accessible to the public (e.g. the internet).