Digital Voice Systems Net-2000 User manual

Net-2000TM Voice Codec Unit
The Speech Compression Specialists
Digital Voice Systems, Inc.
Features
The Net-2000™ voice codec unit (VCU) incorporates Digital Voice Systems,
Inc. (DVSI) award winning AMBE®Vocoder technology to bridge analog
speech I/O to an Ethernet network. This stand-alone device supports multiple
AMBE® vocoder modes that makes it ideally suited for a variety of digital
communication systems as well as volume OEM applications such as VoIP,
and voice recording products.
The flexibility of the Net-2000™ VCU’s patented AMBE® Vocoder technology
maximizes communications system resources and provides optimum voice
comprehension even under extreme bit errors or acoustic background noise
conditions. The Net-2000™ AMBE®Vocoder modes include bit rates
between 2.0 - 9.6 kbps , built-in FEC, DTMF capability, Voice Activity Detection
(VAD), Comfort Noise Insertion (CNI), and echo cancellation.
The Net-2000™ also incorporates the AMBE+2™ Vocoder that sets the
standard for speech quality at the low data rate of 4.0 kbps. The superior
performance characteristics of AMBE+2™ Vocoder have made it successful
in voice communication applications where bandwidth is at a premium and
high quality voice is imperative. In fact, the AMBE®vocoder has been proven
by numerous independent evaluations, to out perform CELP and other
competitive technologies at under half the data rate.
To meet a wide variety of communication system requirements the NET-
2000™ Voice Codec Unit offers an array of speech and channel interfaces
along with control features that make it easy to set-up and operate. The Net-
2000™ includes 2-wire, 4-wire and handset analog interfaces for input and
output of uncompressed speech, as well as, Ethernet and RS-422 as its
channel data interface. A unique feature of the Net-2000™ is that both voice
and channel data can be transmitted over the Ethernet interface at the same
time.
The Net-2000™ implements the channel data interface using a protocol
designed by DVSI. This allows real-time, full-duplex communications via the
Ethernet or RS-422 interfaces to another Net-2000™ unit. Connecting two
Net-2000™ units together is as easy as entering the IP address (or
hostname) of the Net-2000™ units and selecting the desired voice interface
and AMBE®vocoder mode.
The Net-2000™ Voice Codec Unit (VCU)
combines AMBE®Vocoder Technology with
Ethernet network connectivity!
Westford, MA 01886
web: www.dvsinc.com
Digital Voice Systems, Inc.
Tel: [phone]
234 Littleton Road
Fax: [phone]
Stand-alone Design
•Network enabled voice codec unit interfaces AMBE®
vocoders between Analog I/O and Ethernet networks.
•Real-time, full-duplex communications to other Net-
2000™ units via UDP Ethernet or RS-422 interface.
•Both voice and channel data can be transmitted over
the Ethernet interface at the same time.
•Encode/Decode files stored on a PC or networked
attached storage.
Flexibility and Performance
•High performance line level audio using 16-bit linear
codec.
•4-wire and 2-wire analog input/outputs.
•Built-in web server to select audio I/O, gain settings and
vocoder mode from any PC on the LAN.
Supports Variety of AMBE Vocoder Modes
•Flexible bit-rates (2.0 – 9.6 kbps and 4 kbps toll quality)
for optimum system performance.
•Built-in FEC delivers robust performance over channels
degraded by bit errors and/or background noise.
•AMBE™ Vocoder Modes can also include DTMF
capability, Voice Activity Detection, Comfort Noise
Insertion, and Echo Cancellation.
Easy to Integrate and Operate
•The RS-232 serial port can be used as a console
terminal for system setup and control.
•Easy network set-up with built-in DHCP to handle IP
address information when available on LAN.
•The embedded operation software can be field
upgradeable.
•Rack mountable aluminum chassis design.
®

Each Net-2000™ converts the input analog
speech into digital speech samples,
encodes the speech using the selected
AMBE®Vocoder mode and then send the
compressed bit stream out as UDP packets
over the Ethernet interface. Simultaneously,
the compressed bit stream of UDP packets
from the other Net-2000™ is read in from
the Ethernet interface and decoded back in
to 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.
Alternatively, the Ethernet interface can
connect directly to a Local Area Network
(LAN). This configuration can be used to
create a real-time Ethernet based vocoder
communication system or to record /
playback of files using a PC. Being able to
encode/decode files stored on a PC makes
the Net-2000™ ideal for compressed-voice
storage applications or non-real-time testing
and evaluation.
Initial set-up of the Net-2000™ is fast and
straightforward thanks to its Ethernet
network connection. It is equipped to
handle IP address information from a DHCP
The Speech Compression Specialists
Digital Voice Systems, Inc.
234 Littleton Road
Westford, MA 01886
Tel: [phone]
Fax: [phone]
Web: www.dvsinc.com
server when available on the LAN.
Alternatively, the Net-2000™’s RS-232 serial
port can be used via telnet as a console
terminal to allow low-level network setup
and selection among the various input and
output audio interfaces.
The Net-2000™ is controlled via PC
connected through the RS-232 or Ethernet
interface. When connected on a LAN —
any PC on the network can use a standard
web browser to configure and control the
unit without requiring custom PC software.
The user-friendly web pages built-into the
Net-2000™ make it easy to select analog
audio interfaces, configure the AMBE®
vocoder mode and to establish real-time,
full-duplex communication across the
Ethernet or RS-422 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 over a wireless
network through a wireless notebook or
tablet PC.
Technology Team
The Net-2000™ is designed and
manufactured with Digital Voice Systems,
Inc.’s (DVSI) in-depth knowledge of voice
compression algorithms. DVSI’s dedicated
engineering resources have years of
experience in vocoder technology,
specializing in Digital Signal Processing,
software generation and hardware
development. This has lead DVSI to
become the accepted industry leader in high
performance, low-bit-rate, voice
compression technology.
Contact Us
For more information on the NET-2000™
and how to achieve the best voice quality at
the lowest data rate contact us today.
Rear Panel Connections
Serial Port DB9s
LAN RJ-45
RS-422 Synchronous DB-15HD
RS-422 Asynchronous RJ-45
2 Wire I/O RJ-11
Analog Line In RCA Jack
Analog Line Out RCA Jack
Handset RJ-14
AC Line In Pwr. Recp.
Mechanical Specifications
Dimensions: 17.25 X 3.5 X 7.25 inch
Weight: 4.5 pounds
AC Power Requirements
V 100 - 240 V ~
FR 50 / 60 Hz.
28 W
AMBE is a registered trademark of Digital Voice Systems, Inc. AMBE+2 is a trademark of Digital Voice Systems, Inc. © Copyright Digital Voice Systems, Inc. 2003 All Rights Reserved. (2/03-10M)
Specifications subject to change.