Introduction
The Net-2000™ Single Channel Voice Codec Unit (VCU) represents the latest advancement
in voice compression technology offered by Digital Voice Systems, Inc. (DVSI). The
Net-2000™ VCU hardware incorporates DVSI's patented vocoder software for single channel voice compression
applications geared toward Ethernet-based and wireless communication systems. The Net-2000™
VCU is designed for flexibility in integration, making it well-suited for a variety
of other OEM digital-communication applications, including Voice Over Internet Protocol
(VoIP), wireless telephony and voice-monitoring / recording products.
All Net-2000™ VCU models integrate an UDP/IP packet protocol for remote access
and control. The 10Base-T Ethernet connection on the Net-2000™ VCU allows full-duplex
real-time or half-duplex non-real-time single channel voice compression applications over a Local
Area Network (LAN). Using the LAN, two Net-2000™VCUs (of the same models) can communicate to create
a Voice Over Internet Protocol (VOIP) Ethernet-based vocoder communication system.
Communicating between two Net-2000™ VCUs is as easy as entering the IP address
(or host name) of the Net-2000™ VCU units, selecting the desired voice interface
and the Full-Rate or Half-Rate Vocoder mode.
When two Net-2000™ Single Channel VCUs communicate, each converts the input analog speech into
digital speech samples, encodes the speech using the selected vocoder rate and
sends the compressed bit stream out as UDP/IP packets over
the Ethernet interface. Simultaneously, the compressed bit stream of UDP packets
from the other Net-2000™ VCU are read from the Ethernet interface and decoded
back into digital speech samples. The decoded samples are converted back into analog
speech via the AIC-10 codec whose output is sent to both the handset and line-level
output connections. Since the channel data is a packet-based UDP Ethernet protocol,
users can develop their own customized controls and user interfaces so that the
Net-2000™ VCU can fit into an endless array of applications.
Digital Connectivity
The UDP/IP connection can also be used to encode/decode files from a PC, or other
UDP/IP device making the Net-2000™ VCU ideal for compressed-voice storage applications
or non-real-time testing. Alternatively, the Net-2000™ VCU can loop back the
VOIP digital data to itself for voice monitoring and evaluation applications.
The Ethernet connection to a LAN provides the ability for any PC on the network
to use a standard web browser to control the Net-2000™ VCU. The user-friendly
web server built into each model of the Net-2000™ makes it easy to select analog audio I/O
interfaces, select the vocoder mode and to establish communication across the UDP/IP
Ethernet connection. In addition to the control, the web pages display information
about network settings, operating mode and system status. Since the Net-2000™
uses Ethernet, its web page can even be accessed from notebook or tablet PC via
wireless network.
Several Interfaces Provide Flexibility
To meet a wide range of communication system requirements, the Net-2000™ Voice
Codec Unit hosts a variety of inputs and outputs. For uncompressed analog voice
I/O, the Net-2000™ VCU supports 4-wire and handset analog interfaces. For compressed
voice-data communication across a channel, digitized speech can be transmitted and
received through the UDP/IP packet interface. A unique feature of the Net-2000™
VCU is that the compress voice channel data and the uncompressed voice can be transmitted
over Ethernet using the same UDP/IP packet interface.
Fast and Easy Set Up
Initial set up of the Net-2000™ VCU is fast and straightforward thanks to its
Ethernet network connection. It is equipped to handle IP address information from
a DHCP server when available on the LAN. Alternatively, the Net-2000™ VCU's
RS-232 serial port can be used as a console terminal to allow low-level network
set-up and selection among the various input and output audio interfaces.
DVSI developed the Net-2000™ VCU to package the latest software into
a single channel hardware platform that does not require licensing fees or royalties. With off-the-shelf
availability, the Net-2000™ VCU provides cost effective voice compression without
the risks and engineering expenses associated with new product development.
Features Stand-alone Design
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Real-time, full-duplex single channel communications to digital devices or other Net-2000™
units via UDP/IP packet protocol interface
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UDP/IP-enabled voice codec unit interfaces DVSI vocoder technology with Analog I/O and
digital networks
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Both digital voice and compressed voice channel data can be transmitted over the
same UDP/IP packet interface
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Encode/Decode files stored on a PC or networked attached storage
Flexibility and Performance
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High-performance, line-level audio using 16-bit linear codec
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4-wire analog input/outputs
- Built-in web server for set-up and control from a PC on the LAN
Easy to Integrate and Operate
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The RS-232 serial port can be used as a console terminal for system set up and control
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Easy network set up with built-in DHCP to handle IP address information when available
on LAN
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The embedded operation software can be field upgradeable
- Rack-mountable aluminum chassis design