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Net-2000™ VCU Users Manual

Version 4.0, December, 2013

(Subject to Change) Page 1

Digital Voice Systems, Inc.

The Speech Compression Specialists

-2000™-Voice Codec Uni

SI CONFIDENTIAL PROPRIETARY

1 Net-2000™ Voice Codec Unit Introduction

The Net-2000™ Voice Codec Unit (VCU) incorporates Digital Voice Systems, Inc. (DVSI) latest advancement in

voice compression technology to bridge analog speech I/O to an Ethernet network. There are various versions of the

Net-2000™-VCU that support a variety of vocoders used in voice compression digital communication systems.

The basic operation and control of Net-2000™-VCU is the same for all versions. This manual includes information

on all versions of the Net-2000™-VCU. Differences between versions are separated so that the user needs only to

refer to the sections that pertain to the specific Net-2000™ VCU purchased.

The Net-2000™-VCU contains several interfaces for flexibility in speech input and output including Ethernet and

RS-422 as a channel data interfaces. The Net-2000™-VCU speech I/O can operate in full duplex for real time

communication or in half duplex mode voice recording or other storage applications. The speech I/O is easily

managed with the Net-2000™-VCU built-in web server control.

1.1 Features

 Real-time, full-duplex communications via the Ethernet interface to another Net-2000™-VCU unit.

 A built-in web server for easy selection and control of the audio I/O

 The Net-2000™-VCU’s RS-232 serial port can be used as a console terminal to allow low-level system

setup.

 The Net-2000™-VCU can handle information from a DHCP server when available on a Local Area

Network (LAN).

 Encode/Decode files across a LAN to and from a PC

 The embedded user interface allows the operation software to be field upgradeable.

 Both voice and channel data can be transmitted over the Ethernet interface at the same time.

1.2 Interfaces

To meet a wide variety of communication system requirements the Net-2000™-VCU contains three interfaces for

speech input and output and two for channel data. The Net-2000™-VCU’s analog interfaces includes a 4-wire, a

handset and a 2-wire for input and output of uncompressed speech. Control of these interfaces are easily managed

with the Net-2000™-VCU’s built-in web server.

The Net-2000™-VCU provides a RS-422 interface and 10Base- Ethernet interface as a channel connection. The

RS-422 allows two Net-2000™-VCUs to be connected together. By providing both an asynchronous or synchronous

connecting the Net-2000™-VCU offers the flexibility of connecting to some other RS-422 device. Using the

10Base- Ethernet interface the Net-2000™-VCU can also be connected directly to a Local Area Network (LAN).

This configuration can be used to create a real-time full duplex Voice Over Internet Protocol (VOIP) Ethernet based

vocoder communication system between two Net-2000™-VCUs. Alternatively, the Net-2000™-VCU can

Loopback the VOIP information back to itself for voice monitoring and evaluation applications.

When two Net-2000™-VCU communicate, each converts the input analog speech into digital speech samples,

encodes the speech using the selected vocoder mode and then sends the compressed bit stream out over Ethernet as

UDP packets or RS-422. Simultaneously, the compressed bit stream of UDP packets from the other Net-2000™-

VCU are read in from the selected 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.

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