Wegener DVT2000 Manuale utente
PRELIMINARY June 2000
Instruction Manual
MODEL DVT2000™
DIGITAL VIDEO INTEGRATED
TRANSMITTER
Data, drawings, and other material
contained herein are proprietary to
Wegener Communications, Inc., and
may not be reproduced or duplicated in
any form without the prior permission
of Wegener Communications, Inc.
When ordering parts from Wegener
Communications, Inc., be sure to include
the equipment model number, equipment
serial number, and a description of the
part.
In all correspondence with Wegener
Communications, Inc., regarding this
publication, please refer to DVT2000-001C.
First Edition: August 1996
Revised Preliminary: June 2000
WEGENER
COMMUNICATIONSR
TECHNOLOGY PARK / JOHNS CREEK
11350 TECHNOLOGY CIRCLE
DULUTH, GEORGIA 30097-1502
(770) 814-4000 FAX (770) 623-0698
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CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER (OR BACK).
NO USER-SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
CAUTION
As this unit is intended to interface with other electrical/electronic systems, proper
engineering practices must be adhered to during installation and check-out.
All AC power and ground must be installed in accordance with National Electric
Code Standards as to conductor size and limitations (see NFPA 70, articles 200-
280, as amended, if required), and lightning protection must be provided.
All RF interconnections must be properly shielded to prevent ingression or
egression of potential interfering sources to existing services.
Any damage to this unit caused by improper wiring/interconnections will void any
warranty extended.
The following warranty applies to all Wegener Communications products.
All Wegener Communications products are warranted against defective materials and workmanship for
a period of one year after shipment to customer. Wegener Communications' obligation under this
warranty is limited to repairing or, at Wegener Communications' option, replacing parts, subassemblies,
or entire assemblies. Wegener Communications shall not be liable for any special, indirect, or
consequential damages. This warranty does not cover parts or equipment which have been subject to
misuse, negligence, or accident by the customer during use. All shipping costs for warranty repairs will
be prepaid by the customer. There are no other warranties, express or implied, except as stated
herein.
WARRANTY
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Table of Contents
SECTION 1 - GENERAL INFORMATION
Section Title Page
1.1 INTRODUCTION ............................................................................................ 9
1.2 SYSTEM DESCRIPTION ................................................................................ 9
1.2.1 System Capabilities .............................................................................. 9
1.2.2 Transmitter Characteristics .................................................................. 9
1.3 TECHNICAL SUPPORT.................................................................................. 12
1.4 FACTORY DEFAULT SETTINGS ................................................................. 13
SECTION 2 - PHYSICAL DESCRIPTION
2.1 INTRODUCTION ............................................................................................ 15
2.2 FRONT PANEL CONTROLS AND INDICATORS ....................................... 15
2.2.1 Main Keypad ........................................................................................ 15
2.2.2 Function Keypad .................................................................................. 16
2.3 REAR PANEL CONNECTORS ...................................................................... 16
2.4 INTERNAL CONSTRUCTION ....................................................................... 17
SECTION 3 - FUNCTIONAL DESCRIPTION
3.1 INTRODUCTION ............................................................................................ 19
3.2 SIGNAL PROCESSING .................................................................................. 19
3.2.1 Video Input Board ................................................................................ 19
3.2.2 Video Compression Board ................................................................... 19
3.2.3 Audio Board ......................................................................................... 19
3.2.4 Multiplexer ........................................................................................... 19
3.2.5 Modem ................................................................................................. 19
3.3 DETERMINING OVERALL BANDWIDTH ................................................. 19
3.3.1 Occupied Bandwidth (6 dB) ................................................................ 20
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Table of Contents (Continued)
SECTION 4 - INSTALLATION
Section Title Page
4.1 INTRODUCTION ............................................................................................ 23
4.2 SITE REQUIREMENTS .................................................................................. 23
4.2.1 Equipment Considerations ................................................................... 23
4.3 UNPACKING AND INSPECTION ................................................................. 24
4.4 PHYSICAL ENVIRONMENT......................................................................... 24
4.5 CONNECTIONS AND INTERFACES ........................................................... 24
4.5.1 Video Hookups ..................................................................................... 24
4.5.2 Audio Hookups..................................................................................... 24
4.5.3 Control and Monitoring Connections ................................................... 25
4.5.4 User ASYNC Data Input ...................................................................... 26
4.5.5 Data Output .......................................................................................... 27
4.6 INITIAL START-UP PROCEDURE ............................................................... 27
4.7 ADDITIONAL FILTER MATERIAL ............................................................. 28
SECTION 5- OPERATION
5.1 INTRODUCTION ............................................................................................ 29
5.2 FRONT PANEL INDICATORS ...................................................................... 29
5.2.1 Function Keypad .................................................................................. 29
5.2.2 Main Keypad ........................................................................................ 30
5.3 FRONT PANEL OPERATION ....................................................................... 30
5.4 CONFIGURING THE UNIT ............................................................................ 31
5.4.1 Configuring Audio Parameters ............................................................. 32
5.4.2 Configuring Video Parameters ............................................................. 36
5.5 CONFIGURING THE TRANSMISSION PLAN ............................................. 38
5.5.1 Allocating Rates ................................................................................... 38
5.5.2 Setting the IF Frequency ...................................................................... 41
5.5.3 Setting Encoder Number ...................................................................... 41
5.5.4 Setting Other Transmitter Parameters .................................................. 41
5.5.5 Scrambling ............................................................................................ 43
5.5.6 Using the Maintenance Menu .............................................................. 43
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Table of Contents (Continued)
Section Title Page
5.6 STARTING AND STOPPING THE UNIT ...................................................... 45
5.7 USING THE SYSTEM ..................................................................................... 45
LIST OF ILLUSTRATIONS
Figure Title Page
1 DVT2000 Digital Video Transmitter Front Panel ............................................ 10
2 DVT2000 Digital Video Transmitter Front and Rear Panels ........................... 15
3 Board Location ................................................................................................ 17
4 DVT2000 Bandwidth Requirements ................................................................ 21
5 DVT2000 System Block Diagram .................................................................... 22
6 Model DVT2000 Rear Panel Connections ....................................................... 24
7 Setup Menu ...................................................................................................... 27
8 Function Keypad .............................................................................................. 29
9Main Keypad .................................................................................................... 30
LIST OF TABLES
Table Title Page
1Model DVT2000 Digital Video Transmitter Technical Specifications ............. 11
2Main Keypad .................................................................................................... 16
3 Function Keypad .............................................................................................. 16
4Model DVT2000 Rear Panel Connections ....................................................... 18
5Audio Inputs ..................................................................................................... 25
6Audio Outputs .................................................................................................. 25
7DVT2000 Serial Cables to Printer or Terminal ................................................ 26
8DVT2000 Data Output Connector Wiring RS-422 .......................................... 27
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SECTION 1
GENERAL INFORMATION
1.1 INTRODUCTION
This manual describes the installation and operation of Wegener Communications DVT2000
Digital Video Transmitter. The transmitter is a rack-mounted unit, as shown in Figure 1. It is
normally used in conjunction with the DVR2000 receiver in satellite-based digital video
broadcast networks to transmit and receive video, audio and data.
1.2 SYSTEM DESCRIPTION
The DVT2000 Transmitter and DVR2000 Receiver comprise the DV2000 Digital Video
Transmission System. The system uses the MPEG-2 compression technique, with I, B and P
frames. At the transmit site (uplink), the DVT2000 transmitter converts analog or digital video
and audio signals to compressed digital form and transmits them over a satellite link to the
receivers. The high level of compression permits many video signals to be transmitted in the
space normally occupied by a single video signal.
At the receive site, a dish antenna with an LNB (low-noise block downconverter) recovers the
signal and converts it to the L-band frequency range (950 to 2050 MHz). This L-band signal is
carried by coaxial cable (possibly through in-line amplifiers) to the integrated DVR2000
receiver/decoder. The receiver automatically tunes to the desired signal and reconstructs the
original video and audio signals.
1.2.1 System Capabilities
The system features user-defined flexibility. Video compression can be varied between 2.5Mb/s
for low-end applications, to 15 Mb/s for sports and entertainment events. Full field/frame
compensation is possible, with variable B frames and GOP size. The system handles both NTSC
and PAL video, and analog or digital audio.
A variable rate QPSK modem with convolutional and Reed-Solomon error correction permits
users to define the optimal combination of transmission rate up to 20 Mb/s.
1.2.2 Transmitter Characteristics
The DVT2000 Digital Video Transmitter accepts analog video in composite format in NTSC or
PAL standards. The video is converted to CCIR 601 (D1) digital video for subsequent
processing. The unit also accepts D1 video directly.
The encoded multiplexed data is Forward Error Correction (FEC) coded using DVB compliant
concatenated coding. This signal is then modulated by a variable rate Quadrature Phase-Shift
Keyed (QPSK) modulator and output as a 70 MHz IF, tunable in 100 kHz steps. The transmitter
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parameters are controlled through a front panel keypad and LCD display, or remotely through an
RS-232 link. Control operations include setup and diagnostics.
Transmitter specifications are listed in Table 2.
Figure 1. DVT2000 Digital Video Transmitter Front Panel
MPEG-2 VIDEO TRANSMITTER
COMSATCOMSAT
MODEL DVT2000 7 98
4 65
1 32
DEL ENT
0
WEGENERWEGENER
COMMUNICATIONSCOMMUNICATIONS
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