Specifications

Net-2000™ VCU Users Manual
Version 4.0, December, 2013
Net-2
000™-VCU Installation
2.2.2 Voice Audio I/O Connections
2.2.2.1 4-Wire
Connecting the Net-2000™-VCU to analog audio components is fairly self explanatory. A typical connection
would be to connect the audio output of an audio component such as a Mic, a Digital Tape, player or even a PC
sound card output to the Analog Input jack of the Net-2000™-VCU (audio cables not included). Next connect the
Analog Output jack of the Net-2000™-VCU to an amplifier or Audio In jack on a PC sound card.
2.2.2.2 Handset
If the handset connection is to be used instead of the 4-wire interface, connect the standard telephone handset that
was included with the unit to connect to the RJ11 handset connector. This handset has a cord (also included) that is
about a foot long (when not stretched) to help reduce noise from being introduced into the voice signal.
2.2.2.3 2-Wire
The Net-2000™-VCU can be connected to a standard North American POTS line through its 2-wire interface. The
2-wire interface is designed to pick-up the line and be ready to accept analog voice to be encoded and sent across the
designated channel. With the wait on ring feature the Net-2000™-VCU will automatically answer the line when it
receives a call instead of having to keep the line open all the time.
2.2.3 Channel Communication
2.2.3.1 Ethernet
The Net-2000™-VCU implements this channel data interface using a special protocol designed by DVSI. This UDP
streaming mode allows for full-duplex communication to another Net-2000™-VCU box in real time. To run in this
mode the operator selects the voice interface (4-Wire, handset, or 2-Wire) and the Ethernet communications channel
interface. When running in VOIP Mode the VCU encodes a frame of speech from the specified voice interface and
implements a protocol to stream a packet containing a decode command and encoded data to the communications
channel interface. At the same time the VCU expects to receive packets from the communications channel interface
that contains a decode command and encoded data. The VCU decodes and sends this continuous stream to both the
handset and line-out speech outputs.
In File Mode the Net-2000™-VCU responds to incoming voice packets by encoding the voice data in them and
transmitting a channel data packet to the sender, and to incoming channel data packets by decoding them and
transmitting synthesized voice data packets to the sender. Only one user can access the VCU at a time in File Mode.
Transmitting data packets to the VCU from more than one source will produce undesired results.
2.2.3.2 Connecting the Ethernet Network
Make sure the Ethernet cable is connected to the Ethernet port in the back of the NET-2000™-VCU before applying
AC power. Note that if you are going to use a direct Ethernet connection from your PC to the NET-2000™-VCU
you should use a crossover cable. If your NET-2000™-VCU is connected to a hub, a straight-through Ethernet
cable should be used.
The VCU has a 10 Mbps Ethernet interface for network communication. It can operate on a 100 Mbps LAN when
connected to a 10/100 Ethernet hub or router. The default network configuration for the VCU assumes that a DHCP
server is available on the LAN to provide it with valid network address information. If a DHCP server is not
available on the LAN, static IP address information will need to be entered via the serial port in order to access the
VCU over the network.
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