Digital Voice Systems Net-2000-P25 User Manual
The Speech Compression Specialists
Net-2000™-P25
Voice Codec Unit
User’s Manual
Version 2.0.0
December 2003
Net-2000™-P25 Voice Codec Unit
User’s Manual
Version 2.0.0, December 2003
Copyright, 2003
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.
Every effort has been made to ensure the accuracy of this manual. However, Digital Voice Systems,
Inc. makes no warranties with respect to the documentation and disclaims any implied warranties of
merchantability and fitness for a particular purpose. Digital Voice Systems, Inc. shall not be liable for
any errors or for incidental or consequential damages in connection with the furnishing, performance, or
use of this manual or the examples herein. The information in this document is subject to change
without notice.
Trademarks
Net-2000™- P25 VCU Voice Codec Unit, AMBE+2™ and AMBE+™ are trademarks of Digital Voice
Systems, Inc. AMBE® is a registered trademark of Digital Voice Systems, Inc. Other product names
mentioned may be trademarks or registered trademarks of their respective companies and are the sole
property of their respective manufacturers.
All Rights Reserved
Data subject to change
Net-2000™- P25 Voice Codec Unit END USER License Agreement
1.0 Preliminary Statements and Definitions
1.1 "Voice Codec Unit" shall mean the hardware,
software and associated documentation referred to in the
invoice or shipping papers accompanying this agreement for
which END USER has requested a license, and any
derivative works thereof, including modifications,
enhancements and extensions made by or for Digital Voice
Systems, Inc. (DVSI) and including circuit diagrams, timing
diagrams, programmable logic software, logic diagrams,
layouts, operating instructions and user manuals.
"AMBE™ Software" shall mean the speech coding software
and/or firmware provided as part of the Voice Codec Unit.
This software is contained in the Read Only Memories
(ROMS, EPROMS, EEPROMS, etc...) which are included as
part of the Voice Codec Unit. This software includes any
derivative works which have as their source the software
contained in the Read Only Memories, and it includes the
software contained in any future Read Only Memories which
DVSI may provide END USER for use in the Voice Codec.
1.3 "Designated Site" shall mean the location of the
Voice Codec Unit.
1.4 "Proprietary Information" shall mean the information
which DVSI desires to protect against unrestricted disclosure
or competitive use and which is designated as such in writing
by DVSI or is disclosed orally and within thirty (30) days
thereafter is reduced to tangible form pursuant to this
License.
DVSI represents that it owns certain “Proprietary Rights” in
the Technology and in the AMBE and AMBE+2™ Voice
Compression Software, including patent rights in the
Technology, and patent rights, copyrights, and trade secrets
in the AMBE and AMBE+2™ Voice Compression Software.
2.0 License Granted
2.1 Subject to the conditions herein and upon initial use
of the AMBE™ and AMBE+2™ Software within the Net2000™-P25 Voice Codec Unit, DVSI hereby grants to END
USER a non-exclusive, limited license to use the AMBE® and
AMBE+™ Voice Compression Software internal to the Net2000™-P25 Voice Codec Unit. Title to the AMBE® Voice
Compression Software remains with DVSI. No license is
granted for use of the AMBE® AMBE+™ Voice Compression
Software on other than the Net-2000™-P25 Voice Codec
Unit. No license, right or interest in any trademark, trade
name or service mark of DVSI is granted under this
Agreement.
2.2 END USER shall not copy, extract, de-compile,
reverse engineer or disassemble the AMBE® and AMBE+™
Voice Compression Software contained in the Net-2000™P25 Voice Codec Unit.
2.3 Transfer of License
(a) END USER may transfer the Net-2000™-P25 Voice
Codec Unit with the AMBE® and AMBE+™ Software and all
rights under this agreement to a third party together with a
copy of this Agreement provided that END USER provides
DVSI with a written notification of the transfer and provided
that the third party agrees in writing to accept all the terms
and conditions of this agreement. Upon any such transfer,
END USER's rights under this Agreement shall terminate
pursuant to Section 3.0.
DVSI Confidential Proprietary
(b) END USER may relocate the Net-2000™-P25 Voice
Codec Unit, and the subsequent location shall then be
considered the Designated Site.
(c) Except as provided in this Section 2.2, this
Agreement, the AMBE® and AMBE+™ Software and any other
information provided by DVSI to END USER and any licenses
and rights granted hereunder, may not be sold, leased,
assigned, sublicensed or otherwise transferred, in whole or in
part, by END USER.
2.4 END USER shall not de-compile, reverse engineer or
disassemble the Net-2000™-P25 Voice Codec Unit, AMBE®
and AMBE+™ Software.
3.0 Term and Termination
3.1 This Agreement is effective upon initial use of the
AMBE® and AMBE+™ Software on the Net-2000™-P25 Voice
Codec Unit and shall remain in effect until terminated in
accordance with this agreement.
3.2 This Agreement shall terminate automatically without
notice from DVSI if END USER fails to comply with any of the
material terms and conditions herein. END USER may
terminate this Agreement at any time upon written notice to
DVSI certifying that END USER has complied with the
provisions of Section 3.3.
3.3 Upon termination of this Agreement for any reason,
END USER shall: (i) have no further rights to the Net-2000™P25 Voice Codec Unit and AMBE® and AMBE+™ Software; (ii)
discontinue all use of the Net-2000™-P25 Voice Codec Unit
and AMBE® and AMBE+™ Software; and (iii) destroy or, at
DVSI's option, return the Net-2000™ Voice Codec Unit and
AMBE® and AMBE+™ Software.
4.0 Payments
4.1 In consideration of the hardware, software, and
associated materials provided as part of the Net-2000™-P25
Voice Codec Unit and AMBE® and AMBE+™ Software, and in
consideration of the license and rights in the AMBE® and
AMBE+™ Software granted by DVSI, and in consideration of
DVSI's performance of its obligations hereunder, END USER
agrees to pay to DVSI the fee specified in DVSI's invoice.
5.0 Proprietary Notices
5.1 END USER shall not remove any copyright or
proprietary notice on the on the Net-2000™-P25 Voice Codec
Unit and AMBE® and AMBE+™ Voice Compression Software.
6.0 Proprietary Information
6.1 The parties agree that the Net-2000™-P25 Voice
Codec Unit and AMBE® and AMBE+™ Software, Voice
Compression Software shall be considered Proprietary
Information.
6.2 Except as otherwise provided in this Agreement,
END USER shall not use, disclose, make, or have made any
copies of the Proprietary Information, in whole or in part,
without the prior written consent of DVSI.
6.3 END USER shall make reasonable efforts to notify
and inform its employees having access to the Proprietary
Page i
Net-2000™ Voice Codec Unit
User’s Manual
Information of END USER's limitations, duties and obligations
regarding nondisclosure and copying of the Net-2000™-P25
Voice Codec Unit and AMBE® and AMBE+™ Software,.
Proprietary Information shall be used only by employees of
END USER and only at the Designated Site, except as
provided under this agreement.
6.4 END USER shall have no obligations for disclosure
or use of Proprietary Information which: (i) is already known to
END USER, at time of disclosure by DVSI; (ii) is or becomes
publicly known through publication, inspection of product or
otherwise through no wrongful act of END USER; (iii) is
received from a third party without restriction and without
breach of this Agreement; (iv) is independently developed by
END USER; (v) is disclosed to a third party by or on behalf of
DVSI without restriction; or (vi) is approved for release or use
by written authorization of DVSI.
6.5 Notwithstanding any termination pursuant to
Section 3.0, the obligations set forth in this Section 6.0 shall
survive termination of this Agreement.
7.0 Limited Warranty
7.1 DVSI warrants the Net-2000™-P25 Voice Codec
Unit and AMBE® and AMBE+™ Software, to be free from
defects in materials and workmanship under normal use for a
period of ninety (90) days from the date of delivery. DVSI
further warrants that the Net-2000™-P25 Voice Codec Unit
and AMBE® and AMBE+™ Software, operate in accordance
with the written specifications delivered to END USER with
the Net-2000™-P25 Voice Codec Unit,.
7.2 Except as stated in Section 7.1, the Net-2000™P25 Voice Codec Unit and AMBE® and AMBE+™ Software,
are provided "as is" without warranty of any kind. DVSI does
not warrant, guarantee or make any representations
regarding the use, or the results of the use, of the Net2000™-P25 Voice Codec Unit and AMBE® and AMBE+™
Software, with respect to its correctness, accuracy, reliability,
correctness or otherwise. The entire risk as to the results and
performance of the Net-2000™-P25 Voice Codec Unit and
AMBE® and AMBE+™ Software, is assumed by the END
USER. After expiration of the warranty period, END USER,
and not DVSI or its employees, assumes the entire cost of
any servicing, repair or correction of the Net-2000™-P25
Voice Codec Unit and AMBE® and AMBE+™ Software,.
7.3 DVSI warrants that it has the right to enter into this
Agreement and to grant a license to use the Net-2000™-P25
Voice Codec Unit and AMBE® and AMBE+™ Software, to
END USER.
7.4 Except as specifically set forth in this Section 7.0,
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 Net-2000™-P25
Voice Codec Unit and AMBE® and AMBE+™ Software,.
Some states do not allow the exclusion of implied warranties,
so the above exclusion may not apply to END USER. No oral
or written information or advice given by DVSI or its
employees shall create a warranty or in any way increase the
scope of this warranty, and END USER may not rely on any
such information or advice. The limited warranties under this
section 7.0 give END USER specific legal rights, and END
USER may have other rights which vary from state to state.
Information – Section
8.0 Limitation of Liability
8.1 In no event shall DVSI be liable for any special,
incidental, indirect or consequential damages resulting from the
use or performance of the Net-2000™-P25 Voice Codec Unit
and AMBE® and AMBE+™ Software, whether based on an
action in contract, tort (including negligence) or otherwise
(including, without limitation, damages for loss of business
profits, business interruption, and loss of business information),
even if DVSI or any DVSI representative has been advised of
the possibility of such damages.
8.2 Because some states do not allow the exclusion or
limitation of liability for consequential or incidental damages,
the above limitations may not apply to END USER.
8.3 DVSI's maximum liability for damages arising under
this Agreement shall be limited to 20% (twenty percent) of the
fees paid by END USER for the particular Net-2000™-P25
Voice Codec Unit which caused the damages or that is the
subject matter of, or is directly related to, the cause of action.
9.0 Taxes
9.1 All payments required under Section 4.0 or otherwise
under this Agreement are exclusive of taxes and END USER
agrees to bear and be responsible for the payment of all such
taxes (except for taxes based upon DVSI's income) including,
but not limited to, all sales, use, rental receipt, personal
property or other taxes which may be levied or assessed in
connection with this Agreement.
10.0 Export
10.1 United States export laws and regulations prohibit the
exportation of certain products or technical data received from
DVSI under this Agreement to certain countries except under a
special validated license. As of May 20, 1996 the restricted
countries are: Libya, Cuba, North Korea, Iraq, Serbia,
Montenegro, and Iran. The END USER hereby gives its
assurance to DVSI that it will not knowingly, unless prior
authorization is obtained from the appropriate U.S. export
authority, export or re-export, directly or indirectly to any of the
restricted countries any products or technical data received
from DVSI under this Agreement in violation of said United
States Export Laws and Regulations. DVSI neither represents
that a license is not required nor that, if required, it will be
issued by the U.S. Department of Commerce. Licensee shall
assume complete and sole responsibility for obtaining any
licenses required for export purposes.
11.0 Governing Law
11.1 This Agreement is made under and shall be
governed by and construed in accordance with the laws of the
Commonwealth of Massachusetts, except that body of law
governing conflicts of law. If any provision of this Agreement
shall be held unenforceable by a court of competent
jurisdiction, that provision shall be enforced to the maximum
extent permissible, and the remaining provisions of this
Agreement shall remain in full force and effect.
12.0 Notices
12.1 Any notices to DVSI which may be given hereunder
shall be sent in writing to: Digital Voice Systems Inc., 234
Littleton Road, Westford, MA, 01886 USA
DVSI Confidential Proprietary
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Net-2000™ Voice Codec Unit
User’s Manual
Information – Section
Safety Instructions
Safety Precautions
1. Read Instructions - All the safety and operating instructions should be read before operating the
Net-2000™- P25 VCU unit. Failure to exercise reasonable care and to follow all instructions and
heed all warnings may result in injury to property or to individuals.
2. Retain Instructions - The safety and operating instructions should be retained for future reference.
3. Heed Warnings - Adhered to all warnings and cautions on the unit and in the operating
instructions.
4. Follow Instructions - All operating and use instructions should be followed.
5. Water and Moisture - The appliance should not be used near water - for example, near a
washbowl, sink, laundry tub, or in a wet or damp location. Moisture may form inside the unit it is
brought from cool surroundings into a warm room or if the room temperature suddenly rises. To
prevent this, let the Net-2000™- P25 VCU unit stand in its new surroundings for about an hour
before switching it on, or make sure the room temperature rises gradually. Condensation may also
form if the unit is exposed to the breeze from an air conditioner. In these situations, change the
location of the Net-2000™- P25 VCU .
6. Carts and Stands - The Net-2000™- P25 VCU unit should be used only with a cart or stand that is
suitable for the units size and weight. The unit and cart combination should be moved with care.
Quick stops, excessive force, and uneven surfaces may cause the cart to overturn.
7. Wall or Ceiling Mounting - The Net-2000™- P25 VCU unit is not intended to be mounted to a wall
or the ceiling.
8. Ventilation - The Net-2000™- P25 VCU unit should be situated so that its location or position does
not interfere with proper ventilation and air circulation around the unit. For example, the unit
should also not be placed in a built-in installation, such as an sealed cabinet or bookcase that may
impede the flow of air around the unit.
9. Heat - The Net-2000™- P25 VCU unit should be situated away from heat sources such as
radiators, heat registers, ovens, or other appliances (including amplifiers) that produce heat.
10. Power Sources - The Unit should be connected to an AC power source only of the type described
in the operating instructions or as marked on the Net-2000™- P25 VCU unit. The Net-2000™P25 VCU unit uses AC voltages which can cause death or serious injury if used improperly.
Extreme care must be taken when connecting or disconnecting from power sources and in no
event should the user remove the cover or back of the unit.
11. Grounding and Polarization - Precautions should be taken to insure that the grounding or
polarization means of the Net-2000™- P25 VCU unit is not defeated.
12. Power-Cord Protection - Power-supply cords should be routed so that they are not likely to be
walked on or pinched by items placed upon or against them. Pay particular attention to cords at
plugs, convenience receptacles, and the point where they connect to the Net-2000™- P25 VCU
unit. Handle the power-cord by the plug. Do not pull out the plug by tugging the cord.
13. Cleaning - Unplug the Net-2000™- P25 VCU unit from the AC power source before cleaning. The
unit should be cleaned only with a polishing cloth or soft dry cloth. Never clean the unit with
furniture wax, benzene, insecticides, or other volatile liquids.
14. Nonuse Periods - The AC power cord of the Net-2000™- P25 VCU unit should be unplugged
from the wall outlet when left unused for long periods of time.
DVSI Confidential Proprietary
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Net-2000™ Voice Codec Unit
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Information – Section
15. Object and Liquid Entry - Care should be take so that objects do not fall and liquids are not spilled
onto the enclosure.
16. Damage Requiring Service - The Net-2000™- P25 VCU unit should be serviced by qualified
service personnel when:
• The power-supply cord or plug has been damaged.
• Objects have fallen, or liquid has been spilled into the unit; or
• The unit has been exposed to rain; or
• The unit does not appear to operate normally or exhibits a marked change in performance;
or
• The unit has been dropped, or the enclosure damaged.
Rear Panel Caution Description
The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user to
the presence of insolated “dangerous voltage” within the product’s enclosure that may be sufficient
magnitude to constitute a risk of electric shock to persons.
The exclamation point within an equilateral triangle is intended to alert the user to the presence of
important operating and maintenance (servicing) instructions in the literature accompanying the
appliance.
CAUTION:
To prevent the risk of electric shock, do not remove cover.
No user-serviceable parts are inside.
Refer servicing to qualified service personnel.
Servicing
The user should not attempt to service the Net-2000™- P25 VCU unit beyond that described in the
operating instructions. All other servicing should be referred to qualified personnel.
WARNING
The power switch is secondary connected and therefore does not
separate the unit from mains power in the OFF position.
WARNING
To prevent fire or shock hazard, do not expose this unit to rain or
moisture. If this equipment is used in a manner not specified in this
manual, the protection provided by the equipment may be impaired.
Important Note: The serial number for this equipment is located on the rear panel. Please write this
serial number in this manual and keep it in a secure area for future reference.
DVSI Confidential Proprietary
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Net-2000™ Voice Codec Unit
User’s Manual
SAFETY INSTRUCTIONS............................................................... III
SAFETY PRECAUTIONS..........................................................................................III
REAR PANEL CAUTION DESCRIPTION.....................................................................IV
SERVICING ...........................................................................................................IV
NET-2000
NET-2000
TM
GENERAL INFORMATION........................................................................................ 1
FEATURES............................................................................................................ 1
INTERFACES .........................................................................................................1
SET-UP ................................................................................................................ 2
CONTROL............................................................................................................. 2
PROTOCOL...........................................................................................................2
TM
OVERVIEW ...........................................................................................................3
NET-2000™- P25 VCU CONNECTIONS ................................................................3
RACK MOUNT INSTALLATION..................................................................................6
Section – Table of Contents
Table of Contents
VCU INTRODUCTION................................................1
- P25 VCU INSTALLATION .......................................3
Connecting AC Power................................................................................4
Voice Audio I/O Connections......................................................................4
Channel Communication............................................................................4
RS-232 Serial Port......................................................................................5
NET-2000™ - P25 VCU SETUP & CONTROL...............................7
OVERVIEW ...........................................................................................................7
VCU FRONT PANEL..............................................................................................7
Power On Switch........................................................................................ 7
INITIAL SET-UP – (RS-232 SERIAL CONNECTION) ..................................................7
NET-2000™- P25 VCU WEB CONTROL INTERFACE..............................................9
Home Page.................................................................................................9
Net-2000™ -P25 VCU Status................................................................... 10
Voice Source............................................................................................10
APCO Vocoder Selection.........................................................................11
Communication Channel Selection .......................................................... 12
Control Buttons......................................................................................... 13
INTERFACE PROTOCOL..............................................................16
INTRODUCTION ...................................................ERROR! BOOKMARK NOT DEFINED.
PROTOCOL PACKET DESCRIPTION.......................................................................16
DECODE PACKET................................................................................................17
PACKET HEADER ................................................................................................ 16
PACKET PARAMETERS ........................................................................................ 18
len............................................................................................................. 18
type........................................................................................................... 18
seq............................................................................................................ 18
rate[5] ....................................................................................................... 18
cmode....................................................................................................... 19
tone [2]......................................................................................................20
ws.............................................................................................................22
format ....................................................................................................... 22
channel [192]............................................................................................ 23
C-LANGUAGE HEADER FILE.................................ERROR! BOOKMARK NOT DEFINED.
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Net-2000™ Voice Codec Unit
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SPECIFICATIONS.......................................................................37
INTRODUCTION....................................................................................................37
REAR PANEL CONNECTIONS ................................................................................37
AUDIO I/O CONNECTIONS....................................................................................37
ELECTRICAL INPUT ..............................................................................................38
MECHANICAL.......................................................................................................38
ENVIRONMENTAL.................................................................................................38
NET-2000™- P25 SUPPORT ....................................................39
UPGRADE PROCEDURE........................................................................................39
DVSI TECHNICAL SUPPORT.................................................................................39
LIST OF TABLES
TABLE 1 REAR PANEL CONNECTORS......................................................................................3
TABLE 2 SERIAL PORT TERMINAL SET-UP...............................................................................7
TABLE 3 DHCP SET-UP COMMAND ARGUMENTS.....................................................................8
TABLE 4 DHCP SETUP EXAMPLE...........................................................................................8
TABLE 5 HOME PAGE DEFAULTS LIST...................................................................................15
TABLE 6 DECODER PACKET .................................................................................................17
TABLE 7 PACKET HEADER....................................................................................................16
TABLE 8 LEN HEADER PARAMETER.......................................................................................18
TABLE 9 TYPE HEADER PARAMETER.....................................................................................18
TABLE 10 SEQ HEADER PARAMETER ....................................................................................18
TABLE 11 VOCODER RATE PARAMETER................................................................................19
TABLE 12 CMODE PARAMETER.............................................................................................19
TABLE 13 TONE.IDX PARAMETER ..........................................................................................21
TABLE 14 TONE.AMP PARAMETER ........................................................................................22
TABLE 15 WS PARAMETER ...................................................................................................22
TABLE 16 FORMAT PARAMETERS..........................................................................................22
TABLE 17 CHANNEL PARAMETERS ........................................................................................23
TABLE 18 RS-232 SERIAL PORT PIN OUT ............................................................................37
LIST OF FIGURES
FIGURE 1 NET-2000™- P25 VCU REAR PANEL.....................................................................3
FIGURE 2 CONNECTING TWO NET-2000™- P25 VCU’S TOGETHER.........................................5
FIGURE 3 RACK MOUNT INSTALLATION...................................................................................6
FIGURE 4 NET-2000™- P25 VCU FRONT PANEL...................................................................7
FIGURE 5 NET-2000™- P25 VCU HOME PAGE .....................................................................9
FIGURE 6 NET-2000™-P25 STATUS INFORMATION ..............................................................10
FIGURE 7 VOICE SOURCE ....................................................................................................11
FIGURE 8 RATE SELECTION .................................................................................................11
FIGURE 9 COMMUNICATIONS CHANNEL.................................................................................12
FIGURE 11 SOFTWARE VERSION INFORMATION POP-UP WINDOW .........................................13
FIGURE 13 NET-2000™- P25 VCU NETWORK SETTINGS POP-UP WINDOW .........................14
FIGURE 14 HOME PAGE RESET MAIN PAGE TO DEFAULTS ....................................................15
FIGURE 15 START AND STOP BUTTONS................................................................................15
Section – Table of Contents
DVSI Confidential Proprietary
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Net-2000™ Voice Codec Unit
User’s Manual
Section 1 – Net-2000™ VCU Introduction
Net-2000TM VCU Introduction
General Information
The Net-2000™-P25 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.
The Net-2000™-P25 VCU supports both the standard Full-Rate APCO P25 vocoder as well as
DVSI’s new Half-Rate voice compression vocoder proposed to APCO. This makes it an ideal
evaluation module for a variety of digital mobile radio communication systems.
DVSI’s new Half-Rate Vocoder operates at 2450 bps and includes integrated forward error
correction (FEC) to raise the total channel rate to only 3600 bps. DVSI designed the 3600 bps HalfRate Vocoder as an extension to the standard 7200 bps Full-Rate IMBE™ Vocoder that is currently
used throughout P25.
Features
• Net-2000™ VCU incorporates both the current APCO standard Full-Rate vocoder and the
proposed Half-Rate voice compression vocoder
• Real-time, full-duplex communications via the Ethernet interface to another Net-2000™P25 VCU unit.
• A built-in web server for easy selection and control of the audio I/O
• The Net-2000™- P25 VCU’s RS-232 serial port can be used as a console terminal to allow
low-level system setup.
• The Net-2000™- P25 VCU can handle information from a DHCP server when available on a
Local Area Network (LAN).
• The embedded user interface allows the operation software to be field upgradeable.
Interfaces
To meet a wide variety of communication system requirements the Net-2000™- P25 VCU contains
two interfaces for speech input and output and an Ethernet connection for the channel data
interface. The Net-2000™-P25 VCU analog interface includes a 4-wire and a handset for input and
output of uncompressed speech. The speech I/O is easily managed with the Net-2000™- P25
VCU’s built-in web server control.
For a channel connection, the Net-2000™ VCU provides a 10Base-T Ethernet interface for
connecting directly to a Local Area Network (LAN). This configuration can be used to create a realtime 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™-P25 communicate, each converts the input analog speech into digital speech
samples, encodes the speech using the selected APCO Full-Rate or Half-Rate mode and then
sends 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™-P25 are 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.
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Net-2000™ Voice Codec Unit
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Section 1 – Net-2000™ VCU Introduction
Set-up
The Ethernet interface is equipped to handle IP address information from a DHCP server so that
initial set-up of the Net-2000™-P25 VCU is fast and straightforward. Alternatively, the RS-232 serial
port can be used via telnet as a console terminal to allow low-level network setup.
Control
When connected on a LAN — any PC on the network can use a standard web browser to control the
Net-2000™-P25 VCU through the use of a PC web browser. The user-friendly web pages built-into
the Net-2000™-P25 make it easy to select analog audio interfaces, select the vocoder mode and to
establish real-time, full-duplex communication across the Ethernet connection. In addition to the
control, the web pages display information about network settings, operating mode and system
status. Since the Net-2000™-P25 uses Ethernet, its web page can even be accessed over a
wireless network through a wireless notebook or tablet PC.
Protocol
The Net-2000™ VCU uses DVSI’s own UDP interface described in section 4. This allows users to
develop their own application controls and user interfaces for an endless array of customized
applications.
Before using the Net-2000™- P25 VCU, read through this user’s manual in its entirety, paying
careful attention to the safety instructions beginning on page ii.
DVSI Confidential Proprietary
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Net-2000™ Voice Codec Unit
User’s Manual
Section 2 – Net-2000™ VCU Installation
Net-2000TM - P25 VCU Installation
Overview
The Net-2000™- P25 VCU hosts a variety of inputs and outputs that provide you with flexibility in
system integration. The Net-2000™- P25 VCU is designed to be controlled through the use of a PC
and to communicate over an Ethernet network. This manual assumes that the user has a working
networked PC before the Net-2000™- P25 VCU is installed.
Net-2000™- P25 VCU Connections
See Section 5 Specifications for more detailed technical information about each of the connections.
Figure 1 Net-2000™- P25 VCU Rear Panel
Rear Panel Connections
Item No. Name Connector Type Status
1 Serial Port DE9s Active
2 LAN RJ-45 Active
3 RS-422 Synchronous DB-15HD Not Active
4 RS-422 Asynchronous RJ-45 Not Active
5 2 Wire I/O RJ-11 Not Active
6 Analog Line In RCA Jack Active
7 Analog Line Out RCA Jack Active
8 Handset RJ-11 Active
9 No Connection SMA Not Active
10 AC Line In Power Cord Receptacle Active
Table 1 Rear Panel Connectors
In order to install the Net-2000™- P25 VCU connections must be made to a voice audio source and
output, channel communications and control. In Target IP Mode, the Net-2000™- P25 VCU can be
connected to another Net-2000™- P25 VCU located anywhere on the LAN. This configuration can
support a real-time, full-duplex channel over Ethernet connection. This mode can be controlled via
the built-in web page.
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Net-2000™ Voice Codec Unit
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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.
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Net-2000™ Voice Codec Unit
User’s Manual
Section 2 – Net-2000™ VCU Installation
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.
RS-232 Serial Port
Connecting to RS-232
The RS-232 serial port located on the back of the Net-2000™- P25 VCU unit provides low level setup 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.
To connect the serial interface, to a Terminal or PC plug a straight-through modem cable (see pin
outs in Table 35 RS-232 Serial Port Pin Out) into the serial port DE-9s connector and plug the other
end into your terminal (or one of the serial ports on your PC if you are using an emulator). Set the
terminal as shown in Table 2 Serial Port Terminal Set-up.
Figure 2 Connecting two Net-2000™- P25 VCU’s together
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Net-2000™ Voice Codec Unit
User’s Manual
Section 2 – Net-2000™ VCU Installation
Rack Mount installation
When a rack mount kit is purchased with the Net-2000™- P25 VCU the assembly is installed at the
factory prior to shipping. If the rack mount, needs to be removed there are three flat head Philips
screws on each side that secures the rack mount plate to the Net-2000™- P25 VCU chassis as
shown below. To avoid scratching the sides of the Net-2000™- P25 VCU when removing the rack
plate push down on the front of the plate so that it slips out from underneath the unit. When reinstalling the rack mount slip it up from underneath and push it back to be flush with front face. Use
the same six screws to secure the rack mount back on the chassis.
Figure 3 Rack Mount Installation
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Net-2000™ Voice Codec Unit
User’s Manual
Section 3 – Net-2000™ VCU Control
Net-2000™ - P25 VCU Setup & Control
Overview
The Net-2000™- P25 VCU may be set-up from the serial RS-232 interface and controlled through
the use of the built-in web sever. Both of these interfaces may be used and connected at the same
time to provide the flexibility required to integrate to most system configurations.
Connecting to the RS-232 interface allows for low level set-up of the NET-2000™- P25 VCU. When
connected on a LAN -- any PC on the network can use a standard web browser to configure the
unit’s mode of operation, I/O interfaces and selection of vocoder mode. Input and output gain
settings for the voice codec can be also specified.
In addition to the control, the web pages also display information about network settings, operating
mode and system control. Connecting two Net-2000™- P25 VCU units together can be done by
entering the IP address (or hostname) of the other Net-2000™- P25 VCU unit and selecting the
desired voice interface.
VCU Front Panel
Figure 4 Net-2000™- P25 VCU Front Panel
Net - 2000
Net - 2000
V
C U
oice odec nit
Power On Switch
The Net-200™ 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.
Initial Set-up – (RS-232 Serial Connection)
The RS-232 interface is used for command line style set-up. It is used when the Net-2000™ VCU
is installed on a network where there is no DHCP Server or when the user wants to customize the
network configuration.
Serial Port Settings
Bits per second: 9600
Data bits: 8
Parity: None
Stop bits: 1
Flow control: None
Table 2 Serial Port Terminal Set-up
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