PT2088 DVB-T/H Re-Modulator

Transcription

1 PT2000 Terrestrial Gateway PT2077 Digital Transceiver PT2080 DVB-T/H Modulator PT2088 DVB-T/H Re-Modulator PT2090 Digital Repeater PT2088 DVB-T/H Re-Modulator

2 Ter restri al gate way The Terrestrial Gateway product family from ProTelevision Technologies includes a range of products (Network Elements) that each include one or more interfaces for transmission of DVB-T/H, ATSC 8-VSB, MediaFLO or ISDB-T : PT2060 Modulator: Provides an interface/gateway for transmission in ATSC 8-VSB format based on input of transport stream in SMPTE-310 and ASI format (TSoIP interface available as an option) PT2070 Modulator: Provides an interface/gateway for transmission in MediaFLO format based on input of transport stream in ASI format (TSoIP interface available as an option) PT2077 Transceiver: provides an interface/gateway for transmission in DVB-T/H format based on input of a DVB-T/H signal delivered via satellite in DVB-S/S2 format PT2080 Modulator: provides an interface /gateway for transmission in DVB-T/H format based on input of MPEG-2 TS in ASI format or (optionally) MPEG2 TS over IP format PT2088 Re-modulator: provides an interface/gateway for transmission in DVB-T/H format based on input of a DVB-T/H signal delivered off-air from another DVB-T/H transmitter (the device is regenerative meaning that the input signal is completely demodulated to MPEG-2 TS format before being remodulated onto a fresh DVB-T/H spectrum) PT2090 Digital Repeater: provides an interface/gateway for transmission in DVB-T/H format based on input of a DVB-T/H, ATSC 8-VSB, MediaFLO or ISDB-T signal delivered off-air from another DVB-T/H, ATSC 8-VSB, MediaFLO or ISDB-T transmitter (the low internal latency through the device makes it ideal for Gap filler applications) PT2000 Terrestrial Gateway: combines all the above listed units into a single device thus providing a universal interface/gateway for DVB-T/H transmission. 2

3 ProTelevision Technologies A/S is proud to present to the market the PT2088 DVB-T/H Re- Modulator for re-transmission in DVB-T/H format of a MPEG-2 TS feed received in a terrestrial DVB-T/H RF-signal. PT2088 is the successor of the well-known re-modulator PT5788 and the concept of the PT5788 has been refined to a even higher level. We are confident that you will agree with us that the new re-modulator PT2088 offers the same excellent reliability, high performance and ease of operation as the PT5788 and in addition also a lot more. Introduction Being a DVB-T/H > DVB-T/H Re-Modulator, the core function of the PT2088 is to receive a DVB-T/H signal on a VHF/UHF-channel, demodulate the signal completely to MPEG2-Transport Stream level, thereby utilizing the built-in error correction of the DVB-T/H signal to provide an error free MPEG-2 TS signal for transmission on a DVB-T/H compliant COFDM spectrum in accordance with the rules for channel coding and modulation specified in the DVB-T/H standards ETSI EN / (same state-of-the-art modulator used in PT2080). The output of PT2088 is delivered on a user selectable frequency in the range from 30 MHz to 1000 MHz with selectable spectrum bandwidths of 8, 7, 6, and 5 MHz included as standard. The unit supports furthermore non-hierarchical and hierarchical modulation format and it may be user configured for MFN and SFN network operation as required. The receiver part of the PT2088 DVB-T/H Re-Modulator features a special high performance DVB-T/Htuner for optimal reception of the VHF/UHF signal. The PT2088 is available with an active or blank front panel. PT2088/00: Standard re-modulator function with blank front panel. All operations (configuration and monitoring) is carried out through remote interface (Websevice/HTTP, SNMP Client Get/Set/Trap and RS232/SCPI). This version optimizes the cost further without sacrificing performance by being devoid of costs related to front panel bill of materials. 3 PT2088/10: Standard modulator function with sophisticated front panel control. All general operation (configuration and monitoring) is implemented in the sophisticated front panel interface. The extensive use of dedicated function buttons as well as easily recognized soft key functions provides a truly userfriendly experience. Full operation is also supported via remote interface (Websevice/HTTP, SNMP Client Get/Set/Trap and RS232/SCPI). The typical application for the PT2088 DVB-T/H Re-Modulator is to work in combination with any third party RF power amplifier and provide a high quality RF-signal in a DVB-T/H network. The PT2088 constitutes in itself a state-of-the-art product with market leading RF-performance. The built-in linear and non-linear pre-corrector function (IMD Buster McTwo SoftClip) included as standard with PT2088 facilitates furthermore easy and efficient optimization of the overall transmitter system performance (re-modulator plus RF power amplifier and channel/combiner filter) by allowing manual compensation of the nonlinearities usually encountered with any RF power amplifier and analogue RF filter. Addition of the optional adaptive pre-corrector solution PT2754 will enhance the ease of operation further by providing continuous automatic optimization of the transmitter performance (remodulator plus RF power amplifier). The automatic optimization includes the RF power amplifier non-liniearities (phase and gain response vs. power) as well as non linearities in the channel/combiner filter following the power amplifier (amplitude and group delay vs. frequency). Application

4 ASI input-a ASI input-b ASI monitor output PT2088 block diagram * Fixed HP stream if Option PT2722 is installed OPTION PT2720 GBE input/output OPTION PT2730 Satellite receiver input MPEG2-TS MPEG2-TS TS source selector HP LP COFDM modulator ( MHz BW, SFN/MFN) OPTION PT2754 Adaptive Digital Pre-correction OPTION PT dbm output amplifier (RF MHz) Sense 1 Sense 2 4 (RF MHz) RF Tuner OPTION PT2722 Demodulator-2 LP MPEG2-TS HP/LP* System controller (Local and remote) OPTION PT2710 Precision OCXO ppm Demodulator-1 RS232/RS485 for SCPI control RJ45 for Weblink & SNMPclient

5 The possibility to implement a DVB-T/H network based on re-modulation of a received RF-signal may in a number of cases be an attractive solution depending on the infrastructure of the transmitter network, the presence or lack of of existing ground based distribution systems etc. The MPEG-2 TS available from the demodulator can be accessed in the rear panel of the PT2088 in ASI format for monitoring purposes as well as for possible re-multiplexing based on external third party equipment prior to the retransmission in DVB-T/H format. In case the received signal carries a hierarchical mode based signal, the user must choose whether the HP or the LP stream is to be detected. In case option PT2722 is selected, both can be simultaneously processed. The demodulated signal can be monitored, in ASI-format, from a dedicated connector on the unit. Apart from monitoring, the output ASI-signal can be used for re-multiplexing of the transport stream, thus giving the possibility to insert or drop programmes. Parameters that reflect the quality of the received signal are extracted from the tuner board and demodulator and are available for monitoring in the status displays. The user may set-up individual alarm levels for the parameters and program the preferred action in case a parameter drops below the set level, for example generation of a SNMP trap, sending of an and/or recording of the condition in the event log. In addition to the DVB-T/H main RF-input, the PT2088 Re-Modulator also features two ASI MPEG-2 TS inputs. These inputs can be used as an alternative feed in case the primary DVB-T/H input is absent or drops below the user specified quality threshold. Input of transport stream in IP format is furthermore available as an option (PT2720) and input of a transport stream in DVB-S/S2 satellite signal is available as an additional option (PT2730). In general, the alternative of using re-modulator is often to arrange dedicated fiber or radio link feeding. Compared to these solutions, the re-modulator based solutions is almost always a good deal from a financial point of view and in addition it offers high quality and excellent reliability. 5 The extremely high performance DVB-T/H spectrum produced by the modulator combined with the high accuracy and great flexibility of the modulator unit in terms of compensation, for linear and non-linear artifacts in connected amplifier and filter and combiners, by using the pre-correction functionality makes a solid basis for achieving the given requirement of the on air RF-signal with minimal degradation of the RF-signal. In other words, maximal possible coverage is obtained. The remote interface included as standard with PT2088 Re-Modulator (web service and SNMP client) facilitates easy remote control and monitoring both via Web browser and as an integrated solution in a larger management system based on the SNMP clients get, set and trap functions. SW/FW update is furthermore easily carried out from a remote location through the web interface (HTTP and FTP format supported).

6 6 The features and the performance makes the PT2088 simply the best choice in any DVB-T/H network. General In addition to a state-of-the-art implementation of the mandatory channel coding and modulation technology for DVB-T/H modulators the re-modulator also includes: Highly sensitive and selective tuner Prepared for local re-multiflexing Sophisticated management of input substitution User programmable transport stream network ID verification for easy implementation of safeguards against accidental transmission of unauthorized transport streams Input sense lines for on-board management of external alarm conditions Fully programmable alarm management including user programmable muting, event logging, transmission and SNMP trap generation

7 Optional on-board GPS receiver for cost effective SFN synchronization Linear and non-linear Pre-correction for optimization of transmitter performance. Adaptive pre-correction is available as an option (PT2754) Frequency agile RF output with user selectable spectrum polarity, supports any frequency from 30 MHz to 1000 MHz in steps of 1 Hz On-line SW/FW upgrade via Ethernet TR First priority monitoring of MPEG-2 TS inputs The PT2088 is based on using the new PT2000 platform of ProTelevision, thus taking advantage of a large FPGA, a powerful DSP and a powerful Power PC micro controller running an Open Source Linux operating system. In addition to this, a new receiver chip is being used compared with the ancestor PT5788, assuring that state of the art performance is in place on all individual parts of the unit. The PT2088 Re-Modulator assures that the customer gets a reliable partner in the DVB-T/H network for many years of operation. Spectrum efficiency and purity of the signal are the inspiration for ProTelevision and reflected in our products through out the years. PT2088 makes no exception of this. Some of the secrets behind the astonishing performance are: A noise shaped bandwidth limited clipper to control the crest factor Suppression of sideband artifacts from the modulation with the inherent symbol rate. In addition to this, the importance of the pre-corrector is essential The unique double pre-corrector scheme where the two shoulders are adjusted individually. In addition, the fact that the operational bandwidth of the pre-corrector is large, extending into the adjacent channels The unit has two additional inputs active in case the optional digital adaptive pre-correction, PT2754, has been ordered. RF Sense 1 has the purpose of monitoring the signal directly after the amplifier and RF Sense 2 has the purpose of monitoring the signal directly after filter/combiner. The PT2088 has a number of features integrated in order to assist when doing linearisation, phase noise measurements and similar tasks. A number of test signals can be generated: A single carrier mode, with a power corresponding to a normal full spectrum C- OFDM signal, facilitates power measurements using a spectrum analyzer, phase noise measurements and frequency measurements A PRBS-mod can be selected and a BER over the chain or parts of the transmitter chain can be measured and analyzed Purity of signals Inputs/outputs Test modes 7

8 Options In addition to all the functionality implemented in the standard version of the PT2088, ProTelevision have developed some new features which can be added to the PT2088 as options. The available options are at currents stage as follows: PT2710 PT2711 PT2720 PT2730 PT2740 PT2754 Precision OCXO, ppm GPS Transport stream over IP Satellite receiver card 20 dbm output amplifier. Adaptive digital Pre-corrector The extremely high precision OCXO option, PT2710, offers the very high accuracy of ppm. The new oven controlled oscillator option will offer such high stability that the unit will remain capable of working in a SFN more then 12 hours after loss of a external supplied GPS-signal. 8 The high precision GPS-functionality, option PT2711, integrated in the modulator board eliminates the requirement for an external GPS-unit at the site. Thus a considerable cost saving can be made as well as easier management and faster start up can be obtained. The GPS-unit is prepared for active and passive antennas and is able to handle cables with length of more than 100 meters. The GPS-unit has 10 MHz and 1pps outputs and is extremely suitable for operating as the common site GPS-central unit. In addition to the RF-input, input in GBE-format can be handled by the re-modulator by using the option PT2720, Transport stream over IP. It is in addition possible to equip the PT2088 with signal fed from satellite. This is obtained by the option PT2730, capable of handling a DVB-S/S2 fed. The manual pre-correction, now included in the standard PT2088, is complemented with the option PT2754, an adaptive digital pre-corrector with outstanding performance. The adaptive digital precorrection process is extremely fast (typically seconds). The state of the art signal processing algorithms in combination with the unique separate handling of the upper and lower side band, ensures that an output spectra with outstanding performance is given.

9 Reception Inputs RF Input: N, 50 Ω Frequency range: MHz (resolution 1 Hz) Return loss: >10 db Sensitivity for QEF reception (BER 2E-4): 20 dbuv 120 QPSK,CR1/2 36 dbuv QAM, CR7/8 Selectivity (Defined as the maximum allowed level of the disturbing signal relative to the level of the wanted DVB-T signal for QEF reception of the wanted signal) Input level 10 db above max. sensitivity Disturbance location Digital disturbance Analogue disturbance CH db + 51 db CH db + 40 db Co CH - 18 db + 0 db CH db + 41 db CH db + 50 db Input level 70 dbuv Disturbance location Digital disturbance Analogue disturbance CH db +46 db CH db +34 db Co CH - 18 db - 1 db CH db +34 db CH db +46 db Note: Digital disturbance is standard DVB-T spectrum. Analogue disturbance is analogue TV channel with vision carrier (negatively modulated with 250 khz video), analogue audio carrier -13 db, and NICAM carrier 20 db. Wanted channel 794 MHz with transmission parameters 64QAM, CR2/3. Supported modes IFFT: Interleaver: Native and In-depth Guard intervals: Code rates: 2K, 4K, 8K (auto detection) 1/4, 1/8, 1/16, 1/32 (auto detection) 1/2, 2/3, 3/4, 5/6, 7/8 (auto detection) Constellations: QPSK, 16-QAM, 64-QAM (auto detection) Hierarchical modes: User can select demodulation of HP or LP stream by 16-QAM and 64- QAM in alpha-1, alpha-2 and alpha-4 (simultaneous demodulation of HP and LP stream with option PT2722 ) Bandwidth: 8, 7, 6 and 5 MHz user selectable (6 MHz demodulation with 7 MHz CH filter) Signal quality measurement RF level MER Technical specification BER pre-viterby BER post-viterby UCE counter (un-correctable errors) Transmission Signal processing Supported modes IFFT: 2K, 4K and 8K Interleaver: Native as well as in-depth and native (DVB-H mod). Guard intervals: 1/4, 1/8, 1/16, 1/32 Code rates: 1/2, 2/3, 3/4, 5/6, 7/8 Constellations: QPSK, 16-QAM, 64-QAM Hierarchical modes : 16-QAM and 64-QAM in alpha-1, alpha-2 and alpha-4 Network mode: MFN and SFN Bandwidth: 8 MHz, 7 MHz, 6 MHz and 5 MHz Electrical specifications Inputs No of ASI inputs: 2 (4) Input impedance: 75 Ω Return loss: > 13 db Internal GPS Frequency: Antenna net gain range: Antenna: Antenna DC supply: Antenna DC current: TNC 50 Ω GHz 0 to +32 db Passive or active antenna 5 Vdc (±0.5 V) selectable via SW max 50 ma External Clock reference (carrier frequency and SFN timing): Frequency: 10 MHz Level: 100 mv-3 Vpp Impedance: 50 Ω/ > 1 kω, user selectable Time reference (SFN timing): Frequency: 1 PPS Level: 0-5 V Trigger: Selective rising/falling Impedance: 50 Ω/ > 1 kω, user selectable RF sense inputs Sense inputs for the optional adaptive digital pre-corrector. Sense inputs are to be connected to points before and after the filter/combiner of the transmitter. 9

10 10 Number of inputs: 2 Input impedance: 50 Ω Return loss: > 18 db Amplitude: -10 dbm to 10 dbm, max rating 20 dbm (no damage) Output RF-output Center frequency: Frequency stability: Spectrum polarity: Level: Stability: Return loss: Spectrum outside band: +/-3,8 MHz: 0 db +/-4,25 MHz: < 48 db +/-5,25 MHz: < 56 db Harmonics and spurious: MER: Test modes Single carrier: TS-Stuffing: N, 50 Ω Adjustable MHz in steps of 1 Hz Intern ref 1 ppm/or in accordance with extern ref accuracy. Inverted and non-inverted selectable + 0 dbm (adjustable +0 /-10 db) ± 0.5 db > 16 db < -50 dbm below 1 GHz designed to meet 45 db COFDM spectrum replaced by a single carrier at center frequency. The level of the single carrier is equivalent to average RMS level of normal COFDM spectrum. The signal is intended for level alignment. PRBS sequence in accordance with ETR290 paragraph Transport Stream monitor output Selectable source: De-modulated DVB-T/H input, ASI A, ASI B Output fomat: ASI Impedance: 75 Ω 10 MHz reference clock output Impedance: 50 Ω Return loss: > 20 db, 5-15 MHz Output: 1±0.2 Vpp, square 50 Ω load Rise time: 3-10 ns Stability: 1.5 ppm in specified temperature range Aging: 2 ppm per year External/internal reference: Software controlled switching between internal and external mode available. After loss of external reference, the oscillator maintain the previous reference frequency within typically pps output Impedance: Output: Rise time: Signal: 50 Ω V < 10 ns Square wave with programmable polar ity and duty cycle. ±0.2 Vpp, square 50 Ω load Pre-correction The pre-corrector option supports non-linear pre-correction (gain and phases vs. power level) and linear pre-correction (level and group delay response vs. frequency). The pre-corrector allows furthermore hard or soft clipping control of the peak power level (range +12 db to +2 db peak power relative to average RMS level). Non-linear correction: Curve formats: Amplitude scale: Correction points: Gain correction: Phase correction: Linear correction Correction points: 21 Control Interface: Point spacing: Amplitude correction: Amplitude resolution: Group delay correction: Group delay resolution: S21 and VO/VI Linear and logarithmic Max 256, user-defined position Max 12 db, subject to available headroom -6 to +30 degrees, subject to available headroom 1/20 of nominal spectrum BW ±10 db 0.01 db ±1000 ns 1 ns Control Interface All versions of the re-modulator PT2088 support control by RS232/SCPI protocol, Webbrowser interface and SNMP client. The 2088/10 version can in addition be operated via the front panel, LCD-display and sophisticated keyboard. A connector is provided for: Sensing of external alarm events (ground closure). Signaling user programmable alarm events (floating relay contacts). Muting and resetting via external switch es (ground closure). Ethernet interface connector: RJ45 (1 on front, 2 on back) RS232/RS485 interface connector: 9-pin SUB-D Male

11 HW interface: Output: Input: Power supply Voltage: Frequency: Consumption: 15-pin SUB-D Female Two user programmable alarms via separate floating relays, commonmake-break contacts, contact rating 60 V/0.2 A (5 W max) Separate Reset control and Output mut ing control, activated by ground closure VAC Hz Max. 75 W Environmental Specification Climatic Temperature range operating: -5 C to +50 C (+23 F to +122 F) Temperature range within specs: +5 C to +45 C (+41 F to +113 F) Temperature range storage: -30 C to +70 C (-22 F to +158 F) Humidity operating: max 90% RH Humidity storage: max 90% RH EMC Compliant to EN50022 (emission) and EN55024 (immunity). Safety Compliant to EN RoHs Compliant with directive 2002/95/EC. Mechanical Specification Cabinet: 19 wide, 1RU high Width: (19 ) Height: 44 mm (1.75 ) Depth: 483 mm (19 ) Weight: 6 kg (16 lbs) Cooling: Temperature controlled long life fans, two in parallel with magnetic bearing, to assist natural convection Transport and storage: Vibration acc. to IEC Publ Basic re-modulators PT2088/00 DVB-T/H Re-modulator base unit, blank front PT2088/10 DVB-T/H Re-modulator base unit, with front ctrl Options, software PT2754 Adaptive digital Pre-corrector PT2711 GPS Options, hardware PT2710 Precision OCXO, ppm* PT2720 Transport stream over IP* PT2730 Satellite receiver card* PT dbm output amplifier* PT2722 Second demodulator (hierarchical mode)* * Factory installation only Ordering information [2088ver6] Data subject to alteration without notice. Copyright 2009 ProTelevision Technologies Printed in Denmark

12 ProTelevision Technologies A/S Marielundvej 16 DK-2730 Herlev, Denmark Ph : fax: sales@protelevision.com