Net-2000-VCU Voice Codec Unit Users Manual Version 4.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 Net-2000™ VCU Users Manual Version 4.0 December, 2013 (The most up to date version of the manual is always available at www.dvsinc.com) Copyright, 2008 Digital Voice Systems, Inc 234 Littleton Road Westford, MA 01886 This document may not, in whole or in part be copied, photocopied, reproduced, translated, or reduced to any electronic medium or machine readable form without prior consent in writing from Digital Voice Systems, Incorporated.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 Net-2000™ VCU END USER License Agreement 3. Transfer of License 1. Preliminary Statements and Definitions 1.1 This nonexclusive end user product license agreement is a legal agreement between the customer (the END USER) and Digital Voice Systems, Inc.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 8.4 Except as specifically set forth in this Section 8, DVSI makes no express or implied warranties including, without limitation, the warranties of merchantability or fitness for a particular purpose or arising from a course of dealing, usage or trade practice, with respect to the PRODUCT. Some states do not allow the exclusion of implied warranties, so the above exclusion may not apply to END USER.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 Table of Contents 1 2 3 4 NET-2000™ VOICE CODEC UNIT INTRODUCTION ..................................................... 1 1.1 Features..................................................................................................................................1 1.2 Interfaces ................................................................................................................................1 1.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 4.7 BGAN Vocoder Selection .....................................................................................................21 4.8 GMR-2+ Vocoder Selection..................................................................................................21 4.8.1 Rate “Bit Steal 1 Bit”........................................................................................................ 22 4.9 Vocoder Options Configuration ......................
Net-2000™ VCU Users Manual Version 4.0, December, 2013 10 HISTORY OF REVISIONS ............................................................................................. 66 11 NOTES ........................................................................................................................... 67 List of Figures Figure 1 Net-2000™-VCU Rear Panel..........................................................................................................
Net-2000™ VCU Users Manual Version 4.0, December, 2013 Table 14 type Header Parameter................................................................................................................ 40 Table 15 seq Header Parameter................................................................................................................. 40 Table 16 rate[0-5] Parameter ......................................................................................................................
Digital Voice Systems, Inc. The Speech Compression Specialists Net-2000™ VCU Users Manual Version 4.0, December, 2013 Net-2000™-Voice Codec Unit 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.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 1.3 Net-2000™-Voice Codec Unit Net-2000™-VCU modes of operation The Net-2000™-VCU provides the user with two modes of operation VOIP Mode and File Mode. To provide full duplex real-time communication, the Net-2000™-VCU can channel the compressed bit stream through either the RS-422 or the Ethernet interfaces to another Net-2000™-VCU.
Digital Voice Systems, Inc. The Speech Compression Specialists Net-2000™ VCU Users Manual Version 4.0, December, 2013 Net-2000™-VCU Installation 2 Net-2000™ VCU Installation The Net-2000™-VCU hosts a variety of inputs and outputs that provide flexibility in system integration. The Net-2000™-VCU is designed to be controlled through an Ethernet Interface or an RS-232 serial interface with the communication channel interface using the RS-422 serial port or the Ethernet network.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 2.2.2 2.2.2.1 Net-2000™-VCU Installation Voice Audio I/O Connections 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).
Net-2000™ VCU Users Manual Version 4.0, December, 2013 Net-2000™-VCU Installation Figure 2 Connecting to an Ethernet Network 2.2.3.3 RS-422 The Net-2000 VCU also provides a RS-422 interface as a communications channel between two VCU units or some other device. The RS-422 interface follows industry standards of differential I/O can be used as either a Asynchronous or Synchronous connection depending on the communication requirements.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 2.2.3.4 Net-2000™-VCU Installation Connecting to RS-232 The RS-232 serial port located on the back of the Net-2000™-VCU unit provides low level set-up functions. The interface itself consists of a simple command/response ASCII text protocol. You can use a terminal or terminal emulator on a personal computer to type commands at a keyboard as your user interface.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 2.4.1 Net-2000™-VCU Installation Power On Switch The Net-2000™-VCU’s power is turned ON /Off through the switch on the left side of the front panel. Press the top of the switch (I) to turn ON. Press the bottom of the switch (0) to turn OFF. When powering off the unit always wait a few seconds before turning the unit back on. 2.5 Initial Set-up – (RS-232 Serial Connection) The RS-232 interface is used for command line style set-up.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 Net-2000™-VCU Installation The following command example results are shown in the table below adsh>network –h net2k1234 -w lab -i 192.168.1.100 -m 255.255.255.0 -g 192.168.1.250 -n 192.168.1.1 -d domain.com Arguments -h -w -i -m -g -n -d VCU Result DHCP is NOT enabled HOSTNAME Windows WORKGROUP STATIC IP address NETMASK IP address GATEWAY IP address NAMESERVER IP address VCU DOMAIN NAME Example net2k1234 lab 192.168.1.100 255.255.255.0 192.168.1.
Digital Voice Systems, Inc. The Speech Compression Specialists Net-2000™ VCU Users Manual Version 4.0, December, 2013 Net-2000™ VCU Control 3 Net-2000™ VCU Control The Net-2000™-VCU may be set-up from the serial RS-232 interface and controlled through the use of the built-in web server. Both of these interfaces may be used and connected at the same time to provide the flexibility required to integrate to most system configurations.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 Net-2000™ VCU Control The page is designed to give the operator a operator control and summary of all the settings and parameters of the Net-2000™-VCU. The page shows the current status of the Net-2000™-VCU, information on what the data rate and a navigation menu for switching to pages to change system settings. The Vocoder Options table gives the operator control over features (such as VAD and Echo Cancellor, etc.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 Net-2000™ VCU Control Figure 9 Example Setup for File Mode 3.2.3 Network Settings Page Selecting the System Settings from the navigation menu will display a window with the current network information of the Net-2000™-VCU. The user can set the Net-2000™-VCU to either obtain the network settings automatically from a DHCP server (if available) or the user can manually enter the required settings. Figure 10 Net-2000™-VCU Network Settings Window 3.2.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 3.2.3.2 Net-2000™ VCU Control Specify IP Address Radio Button When selected the Net-2000™-VCU allows the operator to manually set up the Ethernet network parameters. After new values have been entered, select the APPLY Button to reboot the Net-2000™-VCU and have the new network settings take effect. 3.2.3.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 3.3.3 Net-2000™ VCU Control Start and Stop Buttons The Start VOIP Mode button is used to apply all the selected settings on the VOIP page and begin communication between two Net-2000™-VCUs. The Net-2000™-VCU will remain active in VOIP mode until either the Stop VOIP mode button is selected or the Start File Mode Button on the File Mode page is selected.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 Net-2000™ VCU Control adsh> Commands to the Net-2000™-VCU can be issued after receiving the prompt. Each time a command is issued to the Net-2000™-VCU it will respond with a string indicating the command was accepted as “OK” or an error message. After another prompt is ready to receive a new command.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 3.7.1.3 Net-2000™ VCU Control FILE mode command: The File mode command set the Net-2000™-VCU to work in file mode.
Digital Voice Systems, Inc. Net-2000™ VCU Users Manual Version 4.0, December, 2013 The Speech Compression Specialists VOIP Mode 4 VOIP Mode When the Start VOIP button is selected the unit is active in VOIP mode and ready to communicate with another Net-2000™ VCU via the Ethernet interface. VOIP mode can also be used for Loopback communications where it sends data to itself over the internal loopback Ethernet address of 127.0.0.1 4.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 4.2 VOIP Mode Vocoder Selection (Version Dependant) The Net-2000™ VCU is available in a variety of vocoder configurations. Depending on the version purchased the unit may contain one or two of the following vocoders. All versions of the Net-2000™ VCU include A-law and ULaw. Vocoders AMBE® AMBE+™ AMBE+2™ APCO Standard APCO Enhanced GMR-1 Vocoder GMR-2 Vocoder BGAN Vocoder GMR-2+ Vocoder A-Law U-Law Figure 13 Vocoder Type and Rate Selection 4.2.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 VOIP Mode APCO Standard Vocoder Mode The Full-Rate mode is compatible with the current APCO P25 standard. The P25 standard vocoder has a total data bit rate of 7200 bps. Of these bits 4400 bps is voice data and 2800 bps is Forward Error Correction (FEC). The vocoder can be selected with or without FEC. Figure 14 APCO Standard Vocoder Selection The APCO Enhanced Vocoder is DVSI’s new vocoder technology.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 4.4 VOIP Mode AMBE® / AMBE+™ Vocoders Version The AMBE® mode is compatible with DVSI’s AMBE-1000™, AMBE-2000™ and AMBE-2020™ Vocoder Chips. DVSI’s proprietary AMBE® Voice Compression Technology delivers excellent voice quality even at low data rates.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 4.5 VOIP Mode AMBE+2™ Vocoder Version The AMBE+2™ Vocoder is DVSI’s newest low data rate vocoder technology. The Net-2000™ VCU incorporates the AMBE+2™ Vocoder at 4.0 kbps with no FEC. It has been shown to outperform DVSI’s previously industryleading AMBE+™ Vocoder and AMBE™ vocoder technologies. It is designed to be particularly robust and perform exceptionally well even under bit errors and acoustic background noise conditions.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 4.6.2 VOIP Mode GMR-2 Vocoder Selection Figure 18 GMR-2 Vocoder Selection 4.7 BGAN Vocoder Selection The VCU contains an implementation of Inmarsat’s BGAN 4 kbps vocoder. Vocoder Type selection is done from the VOIP Mode Vocoder window. The only BGAN vocoder data rate option user has the ability to run is 4000 bps with no FEC. This is the default and only selection in the drop down menu. Figure 19 BGAN Vocoder Selection 4.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 4.8.1 VOIP Mode Rate “Bit Steal 1 Bit” The two “Bit Steal 1 Bit” rates allow for customized data signaling. When running in one of these rates the value of the least significant bit of the data bits has no effect on the vocoder. The “Bit Steal one bit - 2450 bps speech source with 3550 bps FEC” rate has 72 bits of data, so the value of the LSB (bit 71 of the channel data bits) does not influence the vocoder.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 VOIP Mode VAD is available with the following vocoders: Vocoder AMBE® AMBE+™ AMBE+2™ APCO Enhanced GMR-1 GMR-2 BGAN Vocoder (Always ON) GMR-2+ Vocoder (Always ON) Note: The VAD is always enabled when BGAN or GMR-2+ is selected as the vocoder type. 4.9.2 Tone Detector The Tone detector can be turned on or off is selected using the checkbox. When the Tone detector in enabled the Net-2000™ VCU is able to send and receive North American DTMF tones.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 VOIP Mode Echo Canceller is available with the following vocoders: Vocoder AMBE® AMBE+™ AMBE+2™ APCO Enhanced GMR-1 GMR-2 BGAN Vocoder GMR-2+ Vocoder 4.9.5 DTX (BGAN and GMR-2+ Vocoders Only) The Discontinuous Transmission (DTx) feature is used in conjuction with VAD. It can be used to reduce transmit power during times of conversational silence.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 VOIP Mode With the HPD not checked (not enabled) the vocoder creates a period of constant pitch when it receives any pitch fluctuations above the maximum pitch limit. During this time the decoded voice may sound somewhat different but is still understandable and the intelligibility is reasonably preserved. The High Pitch detection feature is available with the following vocoder: Vocoder GMR-2+ Vocoder 4.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 VOIP Mode 4.10.2 Output Gain The output gain setting for the voice codec can be set by the user, however, the default values should be sufficient for most applications. The Output gain can be set to -3dB or -6 dB. Figure 23 Output Gain Selection 4.10.3 2-Wire Wait on Ring The 2-Wire wait on ring feature allows the Net-2000™-VCU to be ready to answer an incoming call from a standard POTS line.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 VOIP Mode *Note: Dial, ring, and busy tones are standard North American call progress tones. Figure 24 DTMF Key Pad 4.10.4.1 Send Button The Send button sends the digits entered in the DTMF digit window out to the select device (encoder or decoder) 4.10.4.2 Clear Button The Clear button allows the operator to delete all the digits entered in the DTMF digit window. 4.10.4.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 VOIP Mode Figure 25 Channel Source 4.11.1 Channel Source Selection Figure 26 Channel Source Selections 4.11.1.1 Ethernet Loopback (Local) In loopback communications mode the Net-2000™-VCU will encode speech received on the selected voice source input (Handset 4-Wire or 2-Wire) and play out the encoded/decoded speech on the handset and Line-Out interface.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 VOIP Mode 4.11.2 Target IP Address The Net-2000™-VCU can communication with another NET-2000™. To communicate (encode and decode to / from) to another Net-2000™-VCU via Ethernet first select Ethernet as the Channel source. Next enter the IP address or host name of the remote unit you are connecting to, in the Target IP address box located under the Channel source pull down menu. 4.11.
Digital Voice Systems, Inc. Net-2000™ VCU Users Manual Version 4.0, December, 2013 The Speech Compression Specialists File Mode 5 File Mode In File mode the Net-2000™-VCU is available for communication with a PC on an Ethernet LAN in order to send data to be encoded or decoded. To set the Net-2000™-VCU to be in file I/O mode select File Mode from the top menu of the Net-2000™-VCU home page. Once selected select the start button and the Net-2000™VCU will be ready in File Mode.
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Net-2000™ VCU Users Manual Version 4.0, December, 2013 File Mode Figure 31 GMR-2 Version File Mode Selection Figure 32 BGAN and GMR-2+ Version File Mode Selection 5.2 Channel Selection Port Number The network settings page allows the operator to change the network port number for the communication channel. The default port number is Port 4000. If a different port number is required enter in the desired port number and select the configure button.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 5.3 File Mode Processing Files with the Net-2000™-VCU Software Note: There is PC source code provided on the included CD that interfaces to the Net-2000™-VCU in File Mode. The README on the disc describe how to build and run the PC software example. The PC program allows users to encode speech to a file and decode channel data from a file. The file mode works in conjunction with software provided by DVSI that runs on a PC.
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Net-2000™ VCU Users Manual Version 4.0, December, 2013 File Mode is the file containing the 16-bit linear PCM is the file to write channel bits to NOTE: The Net-2000 MUST be running in File mode before executing this program. The input files when encoding should be raw 16-bit linear PCM samples in little-endian (PC) byte-order. No headers or format descriptions should be included in the file, only the 8kHz samples.
Digital Voice Systems, Inc. Net-2000™ VCU Users Manual Version 4.0, December, 2013 The Speech Compression Specialists Interface Protocol 6 Interface Protocol The VCU implements a channel data interface using a special protocol designed by DVSI. The Net-2000™-VCU VCU packet is described from the point-of view of the Net-2000™-VCU. 6.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 Interface Protocol When the VCU is in VOIP Mode it exchanges Decode Command Packets with another VCU in real time to provide a full duplex communication channel. The encoder in a VCU compresses speech from its analog handset and 4-wire sources and transmits it to a receiving VCU using Decode Command Packets. The decoder in the VCU synthesizes the channel data from a received Decode Command Packet into speech and sends it to its analog interfaces.
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Net-2000™ VCU Users Manual Version 4.0, December, 2013 6.3.2.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 6.3.2.4 Interface Protocol Channel Data Packet Bytes 0 and 1 (len) The len parameter (bytes 0 and 1) hold the 16-bit length of the packet. The packet length is always 220 bytes. len = Length (in bytes) of total packet (including header) 16 bit Word 15 14 13 12 11 10 9 8 76543210 Byte 0 Byte 1 Data Packet Size 00000000 11011100 Decimal Value 220 bytes Table 13 len Header Parameter 6.3.2.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 6.3.2.7 Interface Protocol Channel Data Packet Bytes 6 to 17 (rate[0-5]) There are six rate information words and four parameter words that are common to the Encode Command Packet, Decode Command Packet, Voice Response Packet and the Channel Response Packet. These are described below.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 Interface Protocol For the GMR-2 vocoder the top 8 bits of rate[5] = 0xC9 , ( = ambemm) For the u-law vocoder the top 8 bits of rate[5] = 0xC5 , ( = u-law) For the a-law vocoder the top 8 bits of rate[5] = 0xC6 , ( = a-law) All others are reserved.
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Net-2000™ VCU Users Manual Version 4.0, December, 2013 Interface Protocol tone is set in the tone.idx and tone.amp parameters of the Channel Data Packet. The a-Law and U-Law decoders do not support tone signaling and ignore the AMBE_DTMF_SEND_FLAG.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 6.3.2.9 Interface Protocol Channel Data Packet Bytes 20, 21, 22, 23 (tone.idx & tone.amp) Appropriate values for tone.idx and tone.amp, are listed in Table 24 tone.idx Parameter. When tone signaling is inactive tone.idx should be set to NO TONE and tone.amp should be set to zero. Description Frequency (Hz) not used Single Tones 156.25 to 3812.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 Interface Protocol Vocoder tone.idx Description Frequency (Hz) not used Single Tones 156.25 to 3812.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 Interface Protocol tone.amp = tone amplitude 16 bit Word 15 14 13 12 11 10 9 8 76543210 Byte 23 Byte 22 Max Amplitude 00000000 00000011 … … … Zero Amplitude 00000000 00000000 … … … Min. Amplitude 10000000 01011010 Valid range: +3 to -90 (signed twos complement integer, units are dBm0) Description Decimal Value +3 … 0 … -90 Table 26 tone.amp Parameter 6.3.2.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 Interface Protocol The voice data format to synthesize is as follows: The voice data to be synthesized is 16 bit PCM (format & 0x000f) == 0x00 All other formats are invalid. Soft Decision ONLY applies to the AMBE+™, AMBE+2™ , GMR-1 and GMR-2+ Vocoders.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 6.3.3.2 Interface Protocol Voice Response Packet The VCU transmits a Voice Response Packet to a PC in File Mode after decoding a received Decode Command Packet. 6.3.3.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 Interface Protocol indicate the actual number of samples in voice[]. The elements of the Voice Data Packet are described in detail in the following sections. 6.3.3.4 Voice Data Packet Bytes 0 & 1 (len) The len parameter (bytes 0 and 1) hold the 16-bit length of the packet (Table 3). The packet length can vary from 347 to 351 bytes.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 6.3.3.8 Interface Protocol Voice Data Packet Bytes 18 & 19 (cmode) The cmode element of the packet contains the input flags to the encoder when it is received by a VCU and the output flags of the decoder when it is transmitted from a VCU. The value of cmode also depends on the vocoder in use. Table 34 and Table 35 list the input flags to the encoder and the output flags of the decoder for the cmode element of Voice Data Packets.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 6.3.3.9 Interface Protocol Voice Data Packet Bytes 20, 21, 22, 23 (tone.idx & tone.amp) Values for tone.idx and tone.amp are the same as the tone.idx and tone.amp values for Channel Data Packets and are listed in Table 24 tone.idx Parameter and Table 25 tone.idx Parameter (cont’d). When tone signaling is inactive tone.idx should be set to NO TONE and tone.amp should be set to zero. 6.3.3.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 6.3.4 Interface Protocol Reset Packet The Reset packet is used to reset the encoder and decoder state when the VCU is in File Mode. In order to get reproducible, bit-exact results in File Mode the state of the vocoder must be reset before sending Channel or Voice packets to the VCU.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 6.3.4.2 Interface Protocol Reset Packet Bytes 2 & 3 (type) The type parameter (bytes 2 and 3) is 16-bits packet type and is always 0x0000 for reset packets. type = Packet type 16 bit Word 15 14 13 12 11 10 9 8 76543210 Byte 2 Byte 3 00000000 00000000 Reset Hex Value 0x0000 Table 41 type Header Parameter 6.3.4.3 Reset Packet Bytes 4 & 5 (seq) Bytes 4 and 5 hold the 16-bit sequence number (see Table 42).
Net-2000™ VCU Users Manual Version 4.0, December, 2013 6.3.5 Interface Protocol Ack Packet The Ack packet is used to acknowledge the Reset packet when the VCU is in File Mode.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 6.3.5.2 Interface Protocol Ack Packet Bytes 2 & 3 (type) The type parameter (bytes 2 and 3) is 16-bits packet type and is always 0x0000 for ack packets. type = Packet type 16 bit Word 15 14 13 12 11 10 9 8 76543210 Byte 2 Byte 3 00000000 00000000 Ack Hex Value 0x0000 Table 46 type Header Parameter 6.3.5.3 Ack Packet Bytes 4 & 5 (seq) Bytes 4 and 5 hold the 16-bit sequence number (see Table 47).
Net-2000™ VCU Users Manual Version 4.0, December, 2013 6.3.6 Interface Protocol Nack Packet The Nack packet is used to respond to badly formatted or unrecognized packets.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 6.3.6.2 Interface Protocol Nack Packet Bytes 2 & 3 (type) The type parameter (bytes 2 and 3) is 16-bits packet type and is always 0x0001 for nack packets. type = Packet type 16 bit Word 15 14 13 12 11 10 9 8 76543210 Byte 2 Byte 3 00000000 00000001 Nack Hex Value 0x0001 Table 51 type Header Parameter 6.3.6.3 Nack Packet Bytes 4 & 5 (seq) Bytes 4 and 5 hold the 16-bit sequence number (see Table 52).
Net-2000™ VCU Users Manual Version 4.0, December, 2013 6.3.6.5 Interface Protocol Nack Packet Bytes 8 & 9 (reason) The reason element is used to indicate the reason for the Nack. This value is currently always 0xFFFF (invalid packet). Other values are reserved for future expansion.
Digital Voice Systems, Inc. Net-2000™ VCU Users Manual Version 4.0, December, 2013 The Speech Compression Specialists VCU Specifications 7 VCU Specifications This section contains hardware Specifications of the VCU. Any interfaces listed as “inactive” require firmware and software upgrades to activate. NOTE: All values are typical unless noted otherwise. All specifications subject to change. 7.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 VCU Specifications RS-422 Asynchronous Type Connector RS-422 differential RJ-45 Pin 1 Figure 33 RS-422 Asynchronous Pin 1 Two Net-2000™-VCU units can be connected together using the RS-422 Asynchronous connection and a crossover CAT5 cable.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 VCU Specifications Line Out Type: Connector: Maximum Output Level Output Impedance: Bandwidth: A/D Resolution: A/D Sampling Rate: Minimum Load Single-ended 4 Wire Output female RCA +/- 1.5 Volts <10 Ohms 20 Hz to 4 kHz 16 bits 8 kHz 600 Ohms Note: A digital max produces 1.414 V signal on the line output when the codec output gain is 0 dB. Handset: Type: Connector: Bandwidth: A/D Sampling Rate: A/D Resolution: 7.
Digital Voice Systems, Inc. The Speech Compression Specialists Net-2000™ VCU Users Manual Version 4.0, December, 2013 Upgrade Procedure 8 Upgrade Procedure Future upgrades to the Net-2000™-VCU’s internal software may become available to provide for additional features and capabilities or to remedy unforeseen issues. In order to upgrade the Net-2000™-VCU’s internal software the following equipment is required.
Net-2000™ VCU Users Manual Version 4.0, December, 2013 Support 9 Support 9.1 DVSI Technical Support If you have any problems with the Net-2000™-VCUVoice Codec Unit or have questions about its operation, please contact: Digital Voice Systems, Inc. 234 Littleton Road Westford, MA 01886 USA Phone: (978) 392-0002 Fax: (978) 392-8866 email: mailto:info@dvsinc.com web: http://www.dvsinc.
Digital Voice Systems, Inc. Net-2000™ VCU Users Manual Version 4.0, December, 2013 The Speech Compression Specialists History of Revisions 10 History of Revisions History of Revisions Version Number Date of Revision Description Pages 3.0 Feb. 2010 Revised format of manual all 3.1 April 2010 Added Note 23 3.2 April 2011 Edited tables 7 through 58 3.3 April 2013 Edited applicable patent list in the end user lisence agreement section 4.0 Dec.
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