JPS NXU-2B, Инструкция по установке и эксплуатации

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NXU-2B Operations Manual
1-6
1.8
NXU-2B Overview
JPS Interoperability Solutions has four decades of experience with voice communications
interoperability, fielding their first devices in 1989. Over this time the company has encountered
and resolved a wide array of problems that can hamper or complicate communications when
disparate devices are patched together into interoperability nets.
The NXU-2B incorporates all this experience, in the form of:
o
A suite of sophisticated DSP algorithms that operate at the unit’s analog and network
interfaces. allowing optimized performance with connected communications devices.
o
Custom radio interface cables, designed by the JPS Systems Engineering Department,
for use with well over 300 different radio makes and models.
JPS interoperability devices are also known for simplicity and ease-of-use. The NXU-2B’s
browser-based Graphical User Interface is designed to make these sophisticated capabilities
easily accessible when necessary, but unobtrusive when not needed.
1.8.1 Important definitions:
COR: (Carrier Operated Relay) A signal that indicates when a radio (or other
type of communications device, such as an NXU-2B) is receiving a valid audio
signal.
PTT: (Push-to-Talk) A control signal that tells a radio (or other communications
device) to transmit the audio signal being sent to it.
Full Duplex Communication System: Users can simultaneously talk to and
listen (for example, a standard telephone call).
Simplex or Half Duplex Communication System: Only one system user can
be heard at a time.
Interoperability Net: Communications link consisting of disparate devices (such
as radios of different types or frequencies, telephones, VoIP phones, etc.)
connected together, similar to a conference call.
These definitions are essential in understanding the basic operation of an interoperability device,
such as a JPS ACU Gateway or this NXU-2B. That is: If multiple communications devices are
engaged in an interoperability net, whenever one device detects active COR (valid audio input),
that audio, along with a PTT signal, is sent to all other devices in the net to be retransmitted.
Also, if any device in an interoperability net is half duplex (such as are almost all radio systems),
then all communications must be half-duplex. The NXU-2B supports full and half-duplex modes.
Among the unit’s sophisticated features are various methods for determining active COR such
as VOX (Voice Operated Switching) or VMR (Voice Modulation Recognition) which are
optimal or necessary for some types of devices, and adjustable audio delays to meet the timing
requirements of the connected communications systems and prevent lost syllables at the start or
end of a transmission.