Digital Voice Systems Net-2000-P25, Руководство пользователя

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Net-2000™ Voice Codec Unit
User’s Manual
Page 4
DVSI Confidential Proprietary
Section 2 – Net-2000™ VCU Installation
Connecting AC Power
The Net-2000™- P25 VCU unit will automatically adjust to both European and US voltage levels.
There are no user settings. Just plug in the AC power cord provided into the AC receptacle on the
back of the unit (See Table 1 Rear Panel Connectors item 9) and plug the other end into an AC
power outlet.
Voice Audio I/O Connections
4-Wire
Connecting the Net-2000™- P25 VCU to analog audio components is fairly self explanatory. At
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™- P25
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.
Handset
If you are using a handset instead of the 4 wire interface, use a standard telephone handset
(included) to connect to the RJ11 handset connector. Use a handset with a cord that is about a foot
long (included) when not stretched. This will help reduce noise from being introduced into the voice
signal.
Channel Communication
Ethernet
The Net-2000™- P25 VCU uses Ethernet to for control (using a web browser), to transmit channel
data in VOIP Mode, and to transmit both voice and channel data in File Mode. A special protocol
designed by DVSI must be used to exchange voice and channel data with the VCU. This UDP
streaming protocol allows for real-time full-duplex communication with another Net-2000™- P25
VCU box (VOIP Mode) and for bit-exact testing (File Mode). To run in VOIP mode the operator
selects the voice interface (4-wire, handset), the IP address of the unit to send channel data to, and
the vocoder (Standard APCO, Half-Rate APCO, or Half-Rate APCO with bit-stealing). When
running in VOIP Mode the VCU encodes a frame of speech from the specified voice interface and
transmits a packet containing the encoded data to the specified target IP address. At the same time
the VCU expects to receive channel data packets from the specified target IP address. The VCU
decodes these packets and sends the decoded speech to both the handset and line-out speech
outputs.
In File Mode the Net-2000™- P25 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.
Connecting the Ethernet Network
Make sure the Ethernet cable is connected to the Ethernet port in the back of the NET-2000™- P25
VCU before applying AC power. Note that if you are going to use a direct Ethernet connection from
your PC to the NET-2000™- P25 VCU you should use a crossover cable. If your NET-2000™- P25
VCU is connected to a hub, a straight-through Ethernet cable should be used.