UBS Axcera LL100ATC, LL200ATC, LL400ATC, LL5ATC, LL50ATC Pro Television Modulator Manual

...

ProTelevision Technologies A/S Marielundvej 16 DK-2730 Herlev Denmark

PT 5780 DVB-T Modulator (ASIC)

Instruction Manual

Trade Mark of the DVB Digital Video Broadcasting Project

PROTELEVISION technologies

An ISO 9001 Certified Company

PT 5780 DVB-T Modulator, Instruction Manual: Total number of pages: 95

Printed in Denmark 2003-08-25 Revision: 3.11

Publication number: 9499 493 12611

PT 5780 DVB-T Modulator ProTelevision Technologies Contents

Contents

1 SAFETY .................................................................................................................. 1-1

1.1 INTRODUCTION........................................................................................................ 1-1

1.2 SAFETY PRECAUTIONS ............................................................................................. 1-1

1.3 CAUTION AND WARNING STATEMENTS ........................................................................1-1

1.4 IMPAIRED SAFETY PROTECTION .................................................................................1-2

1.4.1 Technical Specifications .............................................................................. 1-2

1.4.2 Equipment Ratings ......................................................................................1-3

1.5 ELECTROSTATIC S ENSITIVE DEVICES ..........................................................................1-3

1.6 SYMBOLS............................................................................................................... 1-4

2 INTRODUCTION AND APPLICATIONS...........................................................2-1

2.1 APPLICATIONS......................................................................................................... 2-1

2.1.1 Block Diagram (PT 5780 features)................................................................ 2-3

2.2 TRANSMISSION MODES S UPPORTED ...........................................................................2-3

2.3 TRANSPORT S TREAM INPUTS.....................................................................................2-4

2.4 ALARM CIRCUITS..................................................................................................... 2-6

2.5 OPERATION............................................................................................................ 2-6

2.6 FREQUENCY REFERENCES ........................................................................................2-6

2.7 TEST FACILITIES ......................................................................................................2-7

3 INSTALLATION.....................................................................................................3-1

3.1 INITIAL INSPECTION.................................................................................................. 3-1

3.2 SAFETY INSTRUCTION ..............................................................................................3-1

3.2.1 Earthing...................................................................................................... 3-1

3.3 MAINS VOLTAGE CORD AND FUSES ............................................................................ 3-1

3.4 RACK MOUNTING..................................................................................................... 3-2

3.5 CLEANING .............................................................................................................. 3-2

3.6 CONFIGURATION...................................................................................................... 3-3

3.6.1 Wiring schemes for RS 232 (handshake not implemented) ............................3-3

3.6.2 Alarms........................................................................................................ 3-3

3.6.3 Mute........................................................................................................... 3-4

3.6.4 Reset ......................................................................................................... 3-4

3.7 ACCESS TO AND REPLACEMENT OF PARTS .................................................................. 3-4

3.7.1 Safety......................................................................................................... 3-4

3.7.2 Access to the Units...................................................................................... 3-4

4 OPERATING INSTRUCTIONS...........................................................................4-1

4.1 FRONT PANEL .........................................................................................................4-1

4.1.1 Front Panel Indicators ..................................................................................4-1

4.1.2 Front Panel Controls (The menu system) ......................................................4-1

4.1.3 Front Panel Display .....................................................................................4-3

4.2 REAR PANEL........................................................................................................... 4-3

4.2.1 Rear Panel Connections ..............................................................................4-3

4.3 MENU SYSTEM – DESCRIPTION AND OPERATION.......................................................... 4-5

4.3.1 Power Up ...................................................................................................4-5

4.3.2 Operating Menu System Chart ..................................................................... 4-6

4.3.3 Status Menu System ...................................................................................4-6

4.3.3.1 Description of Status Display Windows........................................... 4-7

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PT 5780 DVB-T Modulat or ProTelevision Technologies Contents

4.4 FACTORY RESET ................................................................................................... 4-30

4.5 SFN MODE OF OPERATION.....................................................................................4-31

4.6 FATAL ALARMS......................................................................................................4-32

4.7 ERROR HANDLING AND CODES ................................................................................ 4-32

4.3.4 Configuration Menu System.......................................................................4-11

4.3.4.1 Top-l evel configuration menu access............................................ 4-12

4.3.4.2 Context sensitive menu access ....................................................4-13

4.3.4.3 TRANSMISSION Menu System (Menu ID 1000) ........................... 4-14

4.3.4.4 SIGNAL Menu System (Menu ID 2000)........................................4-15

4.3.4.5 ALARM Menu System (Menu ID 3000) .........................................4-18

4.3.4.6 PRESET Menu System (Menu ID 4000) ....................................... 4-22

4.3.4.7 CONFIGURE Menu System (Menu ID 5000) ................................ 4-22

4.3.4.8 TEST SIGNAL Menu System (Menu ID 6000)...............................4-24

4.3.4.9 RECEPTION Menu System (Menu ID 7000) ................................. 4-25

4.3.4.10 EVENT LOG Menu System (Menu ID 8000) .................................4-27

4.3.5 Configuring Parameters ............................................................................. 4-27

4.3.5.1 Selection from Enumerated Values ..............................................4-27

4.3.5.2 Editing of Numerical Values ......................................................... 4-28

4.3.5.3 Editing of Text.............................................................................4-29

4.3.5.4 Editing of Percentage Values ....................................................... 4-30

4.6.1 Modulator Board Controller Not Responding...............................................4-32

4.6.2 Instrument Too Hot....................................................................................4-32

5 REMOTE INTERFACE .........................................................................................5-1

5.1 GENERAL DESCRIPTION............................................................................................ 5-1

5.2 GENERAL DESCRIPTION OF THE INTERFACE SYNTAX..................................................... 5-1

5.2.1 General Information..................................................................................... 5-1

5.2.2 Syntax of Program Messages ...................................................................... 5-2

5.2.3 Syntax of Response Messages .................................................................... 5-2

5.2.4 Long and Short Form ...................................................................................5-3

5.2.5 Syntax Elements......................................................................................... 5-3

6 RS232 COMMUNICATION..................................................................................6-1

6.1 REFERENCES.......................................................................................................... 6-1

6.2 COMMANDS EXPLANATION........................................................................................ 6-1

6.2.1 Mandated Commands ................................................................................. 6-1

6.2.2 Required Commands................................................................................... 6-2

6.2.2.1 SYSTem commands ..................................................................... 6-2

6.2.2.2 STATus commands....................................................................... 6-2

6.2.3 Instrument Commands ................................................................................ 6-3

6.2.3.1 DIAGnostic commands.................................................................. 6-3

6.2.3.2 SYSTem commands ..................................................................... 6-3

6.2.3.3 USER commands ......................................................................... 6-5

6.2.3.4 DISPlay commands....................................................................... 6-6

6.2.3.5 INPut commands .......................................................................... 6-6

6.2.3.6 OUTPut commands....................................................................... 6-8

6.2.3.7 MONitor command......................................................................6-13

6.2.3.8 PRECorrect (Nonlinear Pre-corrector) commands ......................... 6-13

6.2.3.9 LPRecorrect (Linear Pre-corrector) commands .............................6-17

6.2.3.10 SFN commands .......................................................................... 6-18

6.2.3.11 ALARM commands .....................................................................6-20

6.2.3.12 EVENT commands ......................................................................6-23

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PT 5780 DVB-T Modulator ProTelevision Technologies Contents

6.3 COMMANDS S UMMARY ........................................................................................... 6-25

6.4 ERROR CODES......................................................................................................6-32

6.2.3.13 TEST commands ........................................................................6-23

6.2.3.14 FACTORY commands.................................................................6-24

6.3.1 Mandated Commands ...............................................................................6-25

6.3.2 Required commands .................................................................................6-25

6.3.2.1 SYSTem subsystem....................................................................6-25

6.3.2.2 STATus subsystem .....................................................................6-25

6.3.3 Instrument commands ...............................................................................6-26

6.3.3.1 DIAGnostic subsystem................................................................6-26

6.3.3.2 SYSTem subsystem....................................................................6-26

6.3.3.3 USER subsystem ........................................................................6-26

6.3.3.4 DISPlay subsystem .....................................................................6-26

6.3.3.5 INPut subsystem.........................................................................6-27

6.3.3.6 OUTPut subsystem.....................................................................6-27

6.3.3.7 MONitor subsystem.....................................................................6-29

6.3.3.8 PRECorrect (Nonlinear Pre-corrector) subsystem ......................... 6-29

6.3.3.9 LPRecorrect (Linear Pre-corrector) subsystem..............................6-29

6.3.3.10 SFN subsystem .......................................................................... 6-30

6.3.3.11 ALARm subsystem......................................................................6-30

6.3.3.12 EVENt subsystem .......................................................................6-31

6.3.3.13 TEST subsystem ........................................................................6-31

6.3.3.14 FACTory subsystem....................................................................6-31

6.4.1 Command errors [-199, -100] .....................................................................6-32

6.4.2 Execution errors [-299, -200] ...................................................................... 6-33

6.4.3 Device specific errors [-399, -300] ..............................................................6-34

6.4.4 Query errors [-499, -400] ...........................................................................6-34

6.4.5 Device specific errors [1, 32468] ................................................................6-34

APPENDIX A…...........................................................................................….A-1

APPENDIX B………………………………………………………………………..A-2

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PT 5780 DVB-T Modulator ProTelevision Technologies Safety

1 Safety

Read this chapter carefully before installation and use of the instrument.

1.1 Introduction

The instrument described in this manual has been designed for use by properly trained personnel only.

Adjustment, maintenance and repair of the exposed equipment should only be carried out by qualified personnel who are aware of hazards involved.

1.2 Safety Precautions

For the correct and safe use of the instrument, it is essential that both operating and servicing personnel follow generally accepted safety procedures in addition to the safety precautions specified in this manual. Specific warning and caution statements, where applicable, are found throughout this manual. Note that warning and caution statements and/or symbols are marked on the instrument as well. This manual provides technical information important for safe operation of the equipment. Please refer to the relevant sections of the manual for technical specifications, installation and operating instructions.

Special attention must be paid to the following issues:

♦ Protective earthing of the instrument is required for the accessible terminals to be safe.

(IEC 1010-1 Safety class I instrument)

♦ The actual environmental conditions must be checked against the specification ♦ Mains voltage must be inside the specified range

The opening of covers or removal of parts, ex cept those to which access can be gained by hand, is liable to expose live parts and terminals. If adjustment, maintenance, or repair of the opened instrument is unavoidable, it must only be carried out by a skilled person who is aware of the hazards involved.

1.3 Caution and Warning Statements

Caution

Used to indicate correct operation or maintenance in order to prevent damage to, or destruction of equipment or other property.

Warning

Used to indicate a potential hazard that requires correct procedures or practices in order to prevent personal injury.

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Safety ProTe levision Technologies PT 5780 DVB-T Modulator

1.4 Impaired Safety Protection

1.4.1 Technical Specifications

This manual provides technical information important for safe operation of the equipment.

Please refer to the Chapter Product Data for information regarding technical specifications and the Chapter Installation and Operating Instructions regarding instructions for use.

Technical assistance may be obtained from your local ProTelevision Technologies customer support organization or from: ProTelevision Technologies Marielundvej 16 DK-2730 Skovlunde Denmark Phone : +45 4470 0000 Fax : +45 4470 0001 E-Mail : helpdesk@protelevision.com Website : http://www.protelevision.com

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PT 5780 DVB-T Modulator ProTelevision Technologies Safety

1.4.2 Equipment Ratings

The instrument can be used with a mains voltage supply of: Voltage range :

90 – 132VAC / 180 - 250 V AC Frequency: 47 - 63 Hz The power consumption: Does not exceed 50 VA

The instrument is designed for the following environmental conditions:

♦ Indoor use ♦ Altitudes up to 2000 m ♦ Temperatures between 5

Maximum relative humidity of 80% for temperatures up to 31oC, decreasing linearly to 50% relative humidity at 40oC.

The instrument is equipped with a number of input and output terminals as described in the Chapter Product Data .

The terminals are protected from becoming hazardous live by means of basic insulation and protective screening.

Whenever it is likely that safe operation is impaired, the instrument must be made inoperative and secured against unintended operation. The appropriate servicing authority must be informed.

For example, safety is likely to be impaired if the instrument fails to perform the intended measurements or shows visible damage.

WARNING: Protection provided by the equipment may be impaired, if the equipment is used in a manner not specified by this manual.

C and 40oC

ATTENTION

1.5 Electrostatic Sensitive Devices

All ICs and many other semi-conductors are susceptible to electrostatic discharges ESD). Careless handling during repair can reduce lifetime drastically.

When repairing, make sure that you are connected to the same potential as the mass of the set via a wrist wrap with resistance. Keep components and tools also at this potential.

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Safety ProTe levision Technologies PT 5780 DVB-T Modulator

1.6 Symbols

Symbol Colour: Explanation:

Red

Black/Yellow

White/Black

High voltage terminal: a terminal at which a voltage, with respect to another terminal or parts exists or may be adjusted to 1000 V or more. (High voltage > 1000 V).

Live part shock risk of electric shock.

To preserve the instrument from damage the operator must refer to an explanation in the instruction manual.

Protective earth (grounding) terminal.

Black

White/Black

Alternating current (placed on the identification plate).

Off (supply - mains switch).

On (supply - mains switch).

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PT 5780 DVB-T Modulator ProTelevision Technologies Introduction and Applications

2 Introduction and Applications

Designed to meet the most demanding requirements of today’s Digital Terrestrial Television Broadcast Market, the DVB-T Modulator PT 5780 from ProTelevision Technologies is ranked number one in its class. A key factor in the products success is the quality of the coding and modulation process. The unit is furthermore highly flexible and therefore easily tailored to provide the exact features required in a specific application. This means that you will only have to pay for the functional features that you need. Retrofitting of features is easy. Normally, the retrofitting only involves uploading new firmware and software by means of a standard PC. .

2.1 Applications

The performance and flexibility of the PT 5780 allows it to excel in any application related to DVB-T modulation. Being a DVB-T modulator the core function of the PT 5780 is to modulate an MPEG-2 transport stream (input) onto a DVB-T compliant COFDM spectrum (output) in accordance with the rules for channels coding and modulation specified in the DVB-T standard ETSI EN 300 744.

Basic version

The basic version of the PT 5780 delivers the COFDM spectrum on a user-defined frequency between 35 and 37 MHz. The default polarity of the spectrum is ‘Inverted’ as normal for a DVBT IF signal. However, the user can freely switch the polarity to ‘non-inverted’ if required. The spectrum bandwidth may be user configured to 8 or 7MHz as required. This flexibility will allow the user to interface the IF signal to a wide range of transmitters and frequency converters.

The basic unit has two MPEG-2 inputs (ASI format). Switching between the two inputs can be done manually and automatically. The latter option provides near seamless switching to a secondary transport stream in case the primary transport stream source fails (a truly valuable feature for broadcast applications.)

The user can configure the basic version to any transmission mode listed in ETSI EN 300 744 (excluding hierarchical mode and SFN mode.)

Optional features

A broad range of optional features allows tailoring the modulator for the specific application.

If the output COFDM spectrum is required on a frequency not covered by the basic version (3537MHz) the RF Converter option PT 8715 is the answer. This high performance converter covers the entire frequency range from 30MHz to 1GHz in steps of just 1Hz. The user can freely set the polarity of the spectrum to inverted or Non-inverted as required. With this converter the PT 5780 will cover any spectrum application and frequency requirement that you will come across in the field of DVB-T.

To upgrade the PT 5780 for SFN transmission you will only need to add the SFN option PT

8732. This option provides the PT 5780 with market leading SFN performance with respect to basic timing accuracy and extent of the local delay offset range. Also, even when the SFN option is installed you can still select MFN mode via the front panel controls. A convenient feature when conducting pre-testing and alignment of RF parameters on transmitter installations before the timing references and transport stream with MIP are in place (as a general rule SFN modulators must mute the output if either of these signals is absent).

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Introduction and Applications ProTelevision Technologies PT 5780 DVB-T Modulator

To extend the standard range of transmission modes to include support of hierarchical modulation the Hierarchical Modulation option PT 8733 must be added. Hierarchical modulation allows simultaneous transmission of two MPEG-2 transport streams. The compromise between data rate and ruggedness can be set differently between the two virtual channels. For example:

• a highly protected channel for transmission to mobile and/or portable rec eivers and

• a high capacity channel, at the expense of ruggedness, for transmission to rooftop

Another typical application is simulcasting of the same program in high definition resolution and standard definition resolution. A significant benefit of hierarchical modulation is that the total data-rate available in a system with two hierarchically modulated RF channels is higher than what is available for a two-channel non-hierarchical system where one RF channel is strictly dedicated to mobile/portable receivers and the other RF channel is strictly dedicated for transmission to rooftop antennas. The hierarchical option itself is often supplemented by adding also an extra set of ASI inputs (dual input option PT 8716) thereby upping the total to four ASI inputs. Access to four ASI inputs will preserve the possibility also in hierarchical mode to switch almost seamlessly to a secondary transport stream source in case the primary transport stream source fails (HP primary input, HP secondary input, LP primary input, LP secondary input).

By adding the 6MHz BW option PT 8735 the PT 5780 will, in addition to the standard 8 and 7 MHz BW, also support transmission in the 6MHz bandwidth mode that is intended for applications in North and South America, Korea, Japan and elsewhere where 6MHz channel raster is standard. Including this option for T&M and R&D applications is also highly attractive as the user simply executes the switching between the three bandwidths via the instrument front panel (one instrument covers all bandwidths defined by the ETS for DVB-T transmission).

To maximise the performance of the transmitter in which the modulator is installed the Digital

Linear and Non-linear Pre-corrector PT 8731 option is recommended. The Non-linear pre- corrector balances out gain and phase non-linearity in the transmitter RF power amplifier

thereby reducing significantly the in-band as well as out of band intermodulation generated by the amplifier. This optimisation of the performance will extend the transmitters coverage area and ease the performance requirement from the transmitter output filter used for suppressing the radiation in adjacent channels below the maximum allowed level. The linear pre-corrector balances out level and group delay variations over the channel bandwidth caused by the transmitter antenna filter and/or channel combiner filers. The linear optimisation of the signal radiated from the transmitter means that the channel equalizer of the DVB-T receiver may focus all its correction capacity on level and group delay errors originating from the actual transmission path. The characteristics of the linear and non-linear pre-correction curves are set by means of an easy to use and highly intuitive graphical user interface, the IMD Buster software package (Windows compatible).

Two options for remote control of the PT 5780 exist. The WebLink option PT 8717 allows remote control of the PT 5780 via Ethernet (TCP/IP). The system is based on a Web server mounted inside the PT 5780. The Web pages stored on the Web server are designed as a complete graphical user interface (GUI) for testing the status and setting the parameters of the modulator. The WebLink concept is popular because remote control with this system only requires a standard PC with a network int erface card (NIC) and a Web browser (Microsoft Explorer 5.0). The SNMP client option PT 8727 allows remote control of the PT 5780 in

antennas.

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PT 5780 DVB-T Modulator ProTelevision Technologies Introduction and Applications

accordance with the SNMP protocol (Get, Set and SNMP traps). This remote control option is intended for systems solutions where it is desired to integrate the control of a range of (SNMP compliant) equipment in a common management system, the SNMP manager. The management system must be adapted/designed to the specific systems requirements and it is therefore not included with the supplied SNMP client option.

2.1.1 Block Diagram (PT 5780 features)

DVB-T Modulator

PT 5780

OPTION PT 8720

Rev 3.0 23.01.2003

u/5780/work/hso/manual V3/drawings/5788 block diagram (features).vsd

Precision TCXO

OPTION PT 8717

WebLink for Web

browser control

0.01ppm

OPTION PT 8727

SNMP Client

OPTION PT 8723

SPI LVDS input

System controller

(Local and remote)

RS232 for SCPI

control

Optionally RJ45

for Ethernet

ASI input-A

MPEG-2 TS

RS232 for SCPI

control

ASI input-B

TS source selector

OPTION PT 8731

Digital Linear

and

Non-linear

Pre-correction

IF monitoring

COFDM

modulator

(8+7MHz BW,

MFN)

OPTION PT 8732

SFN Support

36 MHz

OPTION PT 8715

RF converter

OPTION PT 8733

Hierarchical

modulation

35-

MHz

(RF

30-

1000

MHz)

OPTION PT 8735

8-7-6 MHz BW

2.2 Transmission Modes Supported

♦ MFN mode and SFN mode (SFN requires option PT 8732) ♦ 6, 7, 8 MHz (6MHz requires option PT 8735) ♦ FFT size: 2k or 8k ♦ Guard Interval: 1/4, 1/8, 1/16, and 1/32 ♦ Code Rates: 1/2, 2/3, 3/4, 5/6, and 7/8 ♦ Modulation Constellations: QPSK (4 QAM), 16 QAM, and 64 QAM ♦ Hierarchical α 1, 2, 4 (hierarchical mode requires option PT 8733)

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Introduction and Applications ProTelevision Technologies PT 5780 DVB-T Modulator

Modulation

Code rate

Guard interval

2.3 Transport Stream Inputs

The standard version of the PT 5780 DVB-T modulator is provided with two serial (ASI) inputs. By non-hierarchical mode the active input is selected either via the front panel or the remote control. By hierarchical mode one input is assigned to the high priority stream and the other input is assigned to the low priority stream. The inputs accept an MPEG transport stream according to the DVB recommendation. Both 188 and 204 byte transport packets are supported (in the 204 byte mode the last 16 bytes are always overwritten by the Reed-Solomon redundancy data generated by the modulator). The available data rate for transmission is stated in the tables below in accordance with the selected constellation, code rate and guard interval. Please notice that separate tables applies to 8MHz , 7MHz, and 6MHz bandwidth respectively.

By hierarchical mode 64 QAM constellation and 16QAM constellation can be selected. The available data rate is divided between the high priority channel and the low priority channel. The bit rate for the high priority channel is equal to the capacity stated in the QPSK section of the applicable table irrespective of the constellation chosen. For the low priority channel the capacity depends on the chosen constellation (64Qam or 16QAM). By 64QAM constellation the capacity of the hierarchical low priority channel is equal to the capacity stated in the 16QAM section of the applicable table. By 16QAM constellation the capacity of the hierarchical low priority channel is equal to the capacity stated in the QPSK section of the applicable table.

In Table 2-1 the maximum useful bit rates are indicated for all valid transmission modes in an 8 MHz system.

1/4 1/8 1/16 1/32

½ 4,98 5,53 5,85 6,03 2/3 6,64 7,37 7,81 8,04

QPSK ¾ 7,46 8,29 8,78 9,05

5/6 8,29 9,22 9,76 10,05 7/8 8,71 9,68 10,25 10,56 ½ 9,95 11,06 11,71 12,06

2/3 13,27 14,75 15,61 16,09

16-QAM ¾ 14,93 16,59 17,56 18,10

5/6 16,59 18,43 19,52 20,11 7/8 17,42 19,35 20,49 21,11 ½ 14,93 16,59 17,56 18,10 2/3 19,91 22,12 23,42 24,13

64-QAM ¾ 22,39 24,88 26,35 27,14

5/6 24,88 27,65 29,27 30,16 7/8 26,13 29,03 30,74 31,67

Table 2-1 Available data rate for 8MHz DVB-T

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PT 5780 DVB-T Modulator ProTelevision Technologies Introduction and Applications

Modulation

Code rate

Guard interval

Modulation

Code rate

Guard interval

In Table 2-2 the maximum useful bit rates are indicated for all valid transmission modes in a 7 MHz system.

1/4 1/8 1/16 1/32

½ 4,354 4,838 5,123 5,278 2/3 5,806 6,451 6,830 7,037

QPSK ¾ 6,532 7,257 7,684 7,917

5/6 7,257 8,064 8,538 8,797 7/8 7,620 8,467 8,965 9,237 ½ 8,709 9,676 10,246 10,556

2/3 11,612 12,902 13,661 14,075

16-QAM ¾ 13,063 14,515 15,369 15,834

5/6 14,515 16,127 17,076 17,594 7/8 15,240 16,934 17,930 18,473 ½ 13,063 14,515 15,369 15,834 2/3 17,418 19,353 20,491 21,112

64-QAM ¾ 19,595 21,772 23,053 23,751

5/6 21,772 24,191 25,614 26,390 7/8 22,861 25,401 26,895 27,710

Table 2-2 Available data rate for 7MHz DVB-T

In Table 2-3 the maximum useful bit rates are indicated for all valid transmission modes in a 6 MHz system.

1/4 1/8 1/16 1/32

½ 3,732 4,147 4,391 4,524 2/3 4,976 5,529 5,855 6,032

QPSK ¾ 5,599 6,221 6,587 6,786

5/6 6,221 6,912 7,318 7,540 7/8 6,532 7,257 7,684 7,917 ½ 7,465 8,294 8,782 9,048

2/3 9,953 11,059 11,709 12,064

16-QAM ¾ 11,197 12,441 13,173 13,572

5/6 12,441 13,824 14,637 15,080 7/8 13,063 14,515 15,369 15,834 ½ 11,197 12,441 13,173 13,572 2/3 14,929 16,588 17,564 18,096

64-QAM ¾ 16,796 18,662 19,760 20,358

5/6 18,662 20,735 21,955 22,620 7/8 19,595 21,772 23,053 23,751

Table 2-3 Available data rate for 6MHz DVB-T

With 204 byte packet input the maximum bit rates are increased accordingly.

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Introduction and Applications ProTelevision Technologies PT 5780 DVB-T Modulator

With Multi Frequency Network operation (MFN) the built-in Transport Stream Adapter (TSA) performs the function of discarding any stuffing present on the input stream, inserting new stuffing (0-packets) to adjust the bit rate and finally recalculating the PCR values of the MPEG2 transport stream. Thus the modulator will accept any transport stream with a useful bit rate lower than the maximum indicated in the table.

When operating in the single frequency network mode, the bit rate must be exact. The applied transport stream must furthermore include valid MIP information.

2.4 Alarm Circuits

Two independent alarm circuits are provided. Eac h circuit may be “armed” for a number of conditions important for correct operation. Alarm output is via floating contacts on the rear panel as well as via the remote control. A red LED on the front panel indicates an existing alarm condition while the display will show the nature of the alarm.

2.5 Operation

The DVB-T Modulator may be configured and operated from either the front panel or via the remote control port. The front panel control is implemented as a menu system. The status or configuration menu of interest is displayed on a 2-line LCD display. Navigation between the menus is done by means of a set of cursor keys (UP, DOWN, LEFT, RIGHT and an EXECUTE key). To facilitate the remote control of several transmitters each modulator may be individually named (16 characters). This “name” appears on the front panel display and is available on the remote port.

Also the modulator may be controlled by data embedded in the incoming MPEG transport stream itself. If this mode is enabled, it will have highest priority and other controls will be inhibited. Note this will be the normal mode of operation in a Single Frequency Network (SFN). When not assisting in configuration or mode selection, the front panel display will show the status and operational modes of the modulator. In case of an alarm the nature of the cause of the alarm will be shown.

All settings are always saved in an internal non-volatile storage. This means that the last saved configuration will automatically be recalled at power on.

2.6 Frequency References

The modulator is equipped with an internal frequency reference with stability of ± 1ppm,adequate for many applications including multi frequency applications. Where higher accuracies are required, an external 10 MHz frequency reference input is provided.

In Single Frequency Networks (SFN) this input must be connected to an external 10 MHz reference typically obtained via GPS. In SFN mode the separate 1 pulse per second reference input must also be connected to the special 1 PPS output of the GPS reference.

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PT 5780 DVB-T Modulator ProTelevision Technologies Introduction and Applications

2.7 Test Facilities

The DVB-T Modulator PT 5780 features a range of useful test signal for both off-line and on-line testing.

Single carrier:

The single carrier test signal is an off-line test signal (i.e. it interrupts the modulators data transmission). When the single carrier test signal is activated the normal DVB-T spectrum is substitutes for a single continuous sine wave located at the centre frequency of the normal inservice DVB-T spectrum. The RMS level of the sine equals the average RMS level in the full bandwidth of the normal DVB-T spectrum. The signal is therefore excellent for adjusting transmitter level and/or verifying frequency accuracy or phase noise performance for the modulator output.

-1 Carrier test signal

For special tests any single one of the carriers in the DVB-T spectrum can be switched off. This test signal is in principle an off-line test signal. However, as the FEC of the COFDM coding will normally cope with the loss of a single carrier without difficulty the signal can be activated during normal transmission with marginal influence to the performance (slight increase in BER may be noticed).

-50 Carrier test signal

To allow analysis of in-band intermodulation in a transmitter system 50 consecutive carriers in the DVB-T spectrum can be switched off. The location of the 50-carrier hole can freely be selected but typically the hole is placed at the centre of the spectrum. It is recommended to use this test signal only for off-line tests. However, in most cases the transmission service is maintained despite the loss of 50 carriers thanks to the FEC of the COFDM coding.

TS Stuffing

This test signal facilitates testing of a transmission systems IF and/or RF parameters even when no MPEG-2 input is available (MFN mode only). When the TS Stuffing signal is activated a pseudo random bit sequence as described in section 9.16.1 of the DVB-T Measurement Guidelines ETR 290 is transmitted.

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PT 5780 DVB-T Modulator ProTelevision Technologies Installation

3 Installation

3.1 Initial Inspection

Check the contents of the shipment for completeness and possible transport damage. If the contents are incomplete or damaged, a claim should be filed with the carrier immediately, and the ProTelevision Help Desk should be notified in order to facilitate the repair or replacement of the instrument.

3.2 Safety Instruction

3.2.1 Earthing

Before any other connection is made, the instrument must be connected to a protective earth conductor in one of the following ways: via the three-core mains cable via the protective earth terminal marked.

Before connecting the equipment to the mains of the building installation, the proper functioning of the protective earth lead of the building installation needs to be verified.

Warning: Any interruption of the protective conductor inside or outside the instrument, or disconnection of the protective earth terminal, is likely to make the instrument dangerous. Intentional interruption is prohibited.

3.3 Mains Voltage Cord and Fuses

Different power cords are available for the various voltage outlet s.

Note: If the mains plug has to be adapted for local use, only a qualified person should carry out this task.

This instrument is equipped with a tap-less switch mode power supply that covers most nominal voltage ranges in use: 90-132 VAC RMS / 180-250 VAC RMS. This obviates the need to adapt to the local mains voltage.

The mains frequency is 48-65 Hz.

Warning: This instrument shall be disconnected from all voltage sources when renewing a fuse.

Mains fuse rating: 2 pcs. 1.25A slow blow, 250 V.

The mains fuse-holder is located on the rear panel of the instrument.

If the mains fuse has to be replaced please proceed as follows:

1. Remove the mains cable.

2. Lift the plastic cover (fuse-holder) by means of a small screwdriver.

3. Insert the new fuse into the top of the fuse-holder.

4. Re-insert the cover (fuse-holder).

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Warning: Make sure that only fuses of the required rating, voltage, and of the specified type are used for replacement. The use of repaired (jumpered) fuses and/or the short -circuiting of the fuse holder are prohibited. Fuses must only be replaced by a qualified person who is aware of the hazards involved.

3.4 Rack Mounting

This instrument is delivered in a 19" cabinet. Four self-adhesive rubber feet are supplied together with this instrument.

If several cabinets are mounted in a 19" rack, special attention must be paid to the temperature inside the rack.

The DVB-T modulator is equipped with cooling fans and air inlets on the side of the cabinet.

Note: The operation of the fan is temperature controlled.

If the DVB-T Modulator is mounted between other instruments with high surface temperature, this cooling may not be sufficient. Under these circumstances, it is recommended to make space between the instruments, and to establish forced circulation (cooling) in the rack.

3.5 Cleaning

- Disconnect the instrument from the mains voltage supply before cleaning

- Use only a damp cloth

- Make sure that no liquid is spilled inside the instrument

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*:Not implemented

*: Not implemented

3.6 Configuration

3.6.1 Wiring schemes for RS 232 (handshake not implemented)

PT 5780 PC controller

2 3 4 5 6 7 8

RxD / TxD TxD / RxD

DTR / DSR *

GND / GND

DSR / DTR*

RTS / CTS* CTS / RTS*

3 2 6 5 4 8 7

9 pins 9 pins

PT 5780 PC controller

2 3 4 5 6 7 8

RxD / TxD TxD / RxD

DTR / DSR*

GND / GND

DSR / DTR *

RTS / CTS * CTS / RTS *

2 3 6 7

5 4

3.6.2 Alarms

Note: Contact ratings 60V, 0.2A max. 5W load.

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Wiring of ALARM CONNECTIONS

GND Mute

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Installation ProTelevision Technologies PT 5780 DVB-T Modulator

3.6.3 Mute

The modulator output can be forced to the muted state by establishing a connection between pin 7 and 8 of the Alarm connector (see paragraph 3.6.2 above).

3.6.4 Reset

The modulator can be reset by briefly establishing a connection between pin 7 and 9 of the Alarm connector (see paragraph 3.6.2 above).

3.7 Access to and Replacement of Parts

3.7.1 Safety

Warranty will be void if any person without specific authorisation from ProTelevision Technologies opens the modulator chassis.

The opening of covers or removal of parts, except those to which access can be gained by hand, is liable to expose live parts.

The instrument must be disconnected from all voltage sources before performing any adjustment, replac ement, maintenance, or repair, which requires the instrument to be opened. If repair of the opened instrument is unavoidable, it must only be carried out by a skilled person, who is aware of the hazards involved. To guarantee safety only original spare parts must be used.

3.7.2 Access to the Units

Warranty will be void if any person without specific authorisation from ProTelevision Technologies opens the modulator chassis.

To gain access to the units, remove the screws that secure the top cover of the instrument and lift the cover up.

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PT 5780 DVB-T Modulator ProTelevision Technologies Operating Instructions

4 Operating Instructions

4.1 Front Panel

All operational control and configuration are conveniently carried out from the front panel.

The two line by forty characters LCD display, in conjunction with four cursor keys and an EXECUTE button, allows easy operation of the PT 5780 DVB-T Modulator.

The display is used to indicate the status of various system parameters and also allows changes to be made to these system parameters.

The cursor keys and EXECUTE button are used to navigate through the menu system and to configure system parameters.

4.1.1 Front Panel Indicators

Green POWER ON LED

When lit up, the green LED indicates that power is available from the supply.

Red ALARMS LED

This LED indicates the presence of an irregularity when any of the alarm conditions (e.g. “Sync Loss”, “Reference Loss”, etc) are “active” AND they have been configured to output to one of the relays. See Chapter 4.3.4.5 Alarm menu system for more details.

In addition this LED may flash. This occurs when there is a test signal active.

Red UNLOCKED LED

When lit up, the red LED indicates failure of the modulator in synchronizing to the incoming transport stream or external frequency reference signal.

Note that the Alarm & Unlocked LEDs flash when the DVB-T modulator output is muted. Note that the output in SFN mode will mute irrespective of the general programming of mute conditions until the modulator have established synchronising to the timing references (1PPS, 10MHz and MIP).

Front of the Instrument

4.1.2 Front Panel Controls (The menu system)

For cursor buttons and an execute button plus an LCD display are available for front panel control of the DVB-T Modulator. The front panel functions are divided between read-out of status information (transmission mode, output frequency, alarm status, etc.) and actual setting/change of parameters that will affect the modulator output. To navigate between the two functionalities (status and configuration) please refer to the drawing in figure 4-1

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Operating Instructions ProTelevision Technologies PT 5780 DVB-T Modulator

Status Menu System

Push [EXECUTE] button and [RIGHT ARROW] button in sequence to enter the Configuration Menu System (note 1).

Push [UP ARROW] button to return to the Status Menu System.

Configuration Menu System

Note 1: Activates the Configuration Menu System at the top-level default entry point (Menu ID 1000 - <TRANSMISSION>). Alternatively, by pushing

the [EXECUTE] key twice the Configuration Menu System will be activated at a sub menu relevant to the currently selected status display. For example, pushing [EXECUTE] twice when the Input Status display is active will open the configuration sub menu for control of input configuration

Figure 4-1 Front panel menu system

Dependent on the specifi c function being operated via the front panel the cursor keys may have the following functions:

The 55 button is used to either

• Scroll through the different sub displays provided within the status menu system (refer to the enclosed Status Menu System diagram)

• Exit the current menu and enter a higher-level menu

• Increase alpha-numerical parameters

• Abort confirmation of a change

The 66 button is used to either

• Scroll through the different sub displays provided within in the status menu system (refer to the enc losed Status Menu System diagram).

• Exit the current menu and enter a sub-menu

• Decrease alpha-numerical parameters

• Abort confirmation of a change

The 33 and 44 buttons are used to scroll between the main displays provided in the status menu system (refer to the enclosed Status Menu System diagram) and to scroll between the functions available in the configuration menu system.

Rev 3.0 23.01.2003

u/5780/work/manual v3/drawings/status and config system

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PT 5780 DVB-T Modulator ProTelevision Technologies Operating Instructions

The EXECUTE button is used to

• Enter the configuration menu system (GENERAL or SPECIFIC) when in the status menu

• Confirm changes made to configurable parameters.

system.

4.1.3 Front Panel Display

To guide the user through operations, symbols of the push buttons, which are active at that particular time appear in the top right hand side of the display.

3and 4indicate that the left and right arrow buttons can be used; a 5indicates that the up button can be used; a 6 indicates that the down button can be used; a v indicates that both the up and down buttons can be used; and an E indicates that the EXECUTE button can be used.

55 66 33 44

<< >>

[ ]

……

Guide to Menu Display

In addition, the top line of the display also usually shows the current menu option and stat us. The bottom line of the display indicates possible menu options or parameter settings.

4.2 Rear Panel

Indicates which arrow buttons are active.

Indicates that the EXECUTE button must be pressed to activate the required selection.

These flashing brackets indicate the position of the cursor when in a menu option listing, also described as the “current” menu option in this manual.

These flashing brackets indicate the position of the cursor when in a enumerated parameter listing or when in a parameter set listing. Also described as the “current” parameter in this manual.

Indicates that more items are available in the menu option or parameter listing than can be fitted in the display. Scrolling right with the 4 button will display

these items.

4.2.1 Rear Panel Connections

Safety Ground (chassis)

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Mains Connector Mains voltage receptacle with ON/OFF switch. ON: When “I” is pressed. OFF: When “O” is pressed.

Input Connectors A and B Two BNC inputs (A and B) are provided for asynchronous serial transport streams (ASI).

Remote Connectors 1 and 2 Two 9 pole male Sub-D connectors are utilised for the remote connectors. They are configured as RS 232 connections. For configuration of these connectors refer to the CONFIGURE menu system in Chapter 4.3.4.7.

Monitor Output Connector A BNC connector (ASI format1) is provided for output monitoring purposes.

Alarms Connector A 9 pole male sub-D connector of floating-contact type is provided to connect the two alarm switches to external alarm indicators. The connector also includes contact points for groundclosure activated output muting and instrument reset. For connections, refer to the Installation chapter of this manual. For configuration of alarms, refer to Chapter 4.3.4.5 Alarm menu system.

Reference Inputs 1 PPS - A BNC connector is provided for a 1 pulse per second input signal for SFN synchronization. 10 MHz - A BNC connector is provided for an external frequency reference input of 10 MHz.

IF Output A BNC connector (with a 50  impedance) is provided for the IF output signal.

IF/RF Output A An N-type connector (with a 50  impedance) is provided for the main IFR/RF OFDM output.

IF/RF Output B An N-type connector is also provided for an optional IF/RF output signal.

MAINS FUSE 2x 1.25A SLOW BLOW

REMOTE 2

A B

IF/RF OUTPUTS

IF/RF

INPUT

OUTPUT OUTPUT INPUT BREF. INPUTS

ALARMS

REMOTE 1

ASI IEEE 1394MONITOR10MHZ1PPS

ASI IEEE 1394

INPUT A

ETHERNET CE

Rear of the Instrument

When monitoring the internally processed MPEG-2 streams (Demodulator output or the TSA adapted input) the clocking out of the useful data takes place during the actual COFDM symbol – no data is clocked out during the COFDM signals guard interval (the data stream is therefore of a bursty nature)

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This text is a site specific The current date and time is

ler

The software release is momentarily displayed before the modulator enters

4.3 Menu System – Description and Operation

The PT 5780 DVB-T Modulator is equipped with different functions dependent on the purchased options.

An operating menu chart, which reflects the structure of the menu system when all possible functions are installed and enabled, is provided in appendix A..

The menu system is designed as a “tree” structure, with a number of different “branches”. Each “branch” is made up of a “menu options”. The lowest “branch” contains a configurable menu option with a list of parameters to choose from.

Note that additional configurable options are available via remote access/control. See Chapter

6.2.3.

The menu system has two main functions:-

1. system status display - the display of various modulator configuration settings through

“status windows”

2. system configuration - the ability to modify the modulator’s configuration settings through

“configuration windows”.

On start up the modulator always enters the system status menu.

There are two ways to enter the configuration menu system; by pressing [EXECUTE] followed by the [RIGHT] arrow button the configuration system will be opened at the top level entry point and the user will be able to navigate freely between all the menus. Alternatively, the user can press [EXECUTE] twice to open the menu system at a sub menu relevant to the status menu parameters being displayed when the key -press sequence is initiated. When using this navigation method pressing the [UP] arrow key will recall the last status display.

4.3.1 Power Up

The start -up process includes the following status windows:

---------------------------------------PT5780 DVB-T Modulator PTV

- Power-up - 2001-07-08, 3:07:33

----------------------------------------

And later:

---------------------------------------PT5780 DVB-T Modulator PTV

Release X.X ............................

----------------------------------------

identification and can be modified by the customer via the Remote Interface only.

displayed until the back-end contro l is powered up.

the first status window.

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The first line will flash. After new

In case new micro-code has to be installed, the following is displayed:

---------------------------------------**** R E C O N F I G U R I N G **** =- micro-code being installed -=

----------------------------------------

Following successful start -up, the first status display window appears – see Chapter 4.3.3.1.

Switching the instrument off and then back on again retains all system configuration settings.

micro-code has been downloaded, the system

automatically reboots.

4.3.2 Operating Menu System Chart

A set of charts describing the menu system is provided (see appendix A) in order to diagrammatically show the structure of the menu system, with the various menu options and parameters. The charts enclosed are:

• Status Menu System

• Configuration Menu System (page 1 of 2)

• Configuration Menu System (page 2 of 2)

All menu windows in the menu system contain a four-digit number in the top right hand position. This number is known as the menu identification number and is useful for referencing and navigating purposes and is shown in “red” in the Menu System Charts. The menu-structure has a maximum of four levels; hence the four-digit identification.

4.3.3 Status Menu System

If all hardware/software options are installed, enabled and turned on, the system status menu consists of a maximum of eight main “status windows”. Each main “status window” can be divided into a number of sub windows. The “status windows” display the settings of various configurable options and system variables.

A description of each status window is provided below. Each status window is identified with a flashing character (’a-n’ through to ’h-n’) in the lower right hand corner of the display (n is an integer decimal value 1, 2, 3,… that identifies the specific sub window). These status window identification characters flash at approximately 1 Hz to indicate that the device is running. If preferred, the status display identifiers can be removed from the display altogether or left as a constant display by using the CONFIGURE – STATUS MENU ID menu option. Chapter 4.3.4.7 describes how to configure this Menu ID.

As mentioned previously, certain status windows are only accessible if the appropriate hardware/software options are installed.

The operator may navigate through the main status windows by using the left or right cursor keys. Navigation between sub status windows is where applicable done by means of the up or down arrow keys. On reaching the last or first status window the system loops round to the first and last respectively.

The information in the status display windows are updated approximately every ½ sec.

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4.3.3.1 Description of Status Display Windows

Status Window ‘a1’ – The Input (or High Priority Input in the case of a hierarchical system) Status Window

The example given here is for a hierarchical system:

--------------------------------------- INPUT HP: A ASI / 204 OK wv8E Ref:Ext a1

----------------------------------------

Status Window ‘a2’ – The Low Priority Input Status Window

This window is only available when the hierarchical version of the modulator is in use. However if the hierarchical mode is set to “NONE” through the menu TRANSMISSION – MODE – HIERARCHICAL MODE, the following window is displayed, as there has been no hierarchical alpha parameter configured:

--------------------------------------- INPUT LP: Non Hierarchical Mode wv8E

Ref: Int a2

----------------------------------------

However if the hierarchical alpha parameter is set to one of the hierarchical modes (alpha 1, alpha 2 or alpha 4), the following window is displayed (assuming that input B has been selected as LP source):

--------------------------------------- INPUT LP: B ASI / 204 OK wv8E Ref:Int a2

----------------------------------------

The Input status windows show the data packet size, the input signal type and the source of the 10MHz system reference clock (Internal or External)

Status Window ‘a1’ – Signal loss vs. Auto Substitute function When the modulator cannot detect an input signal and the auto substitute function is disabled, the following input status window appears (assuming that input A signal source is lost in nonhierarchical mode):

--------------------------------------- INPUT : A ASI No Sync wv8E

Ref:Int a1

----------------------------------------

Note: “No Sync” flashes.

If the input specified as primary source in non-hierarchical mode is lost when the auto substitute function is enabled, the following input status window appears (assuming that the input specified as secondary source (B) is available):

--------------------------------------- INPUT Prim: A ASI No Sync wv8E

Ref:Int Sec: B ASI /204 OK <Actual a1

----------------------------------------

Note: “No Sync” flashes.

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