Draft SABS standards for Set Top Boxes Feb 2009
Contents
1. FM sound carrier and a NICAM sub carrier as specified in 4 2 3 8 above Table 5 dB for QEF in presence of co channel analogue TV carrier Constellation 64 QAM Guard interval 1 8 1 4 4 2 3 11 Performance in time varying channels The STB decoder shall be able to operate with all signal time variations that naturally exist in connection with fixed roof top reception e g swaying mast moving antenna and in house portable reception e g people the vicinity of the receiving antenna 15 5 5 862 2009 Edition 1 The increase in required C N for QEF reception shall be less than for a 0 dB echo with frequency separation equal to 20 Hz and a delay of 20 us corresponding to a Doppler shift of 10 Hz after AFC compared to a 0 dB echo with frequency separation equal to 1 Hz and delay of 20 us corresponding to a Doppler shift of 0 5 Hz after for the following modes 8K 64 QAM R 2 3 A T 1 8 and 8K 64 QAM R 2 3 A T 1 4 The increase in required C N for QEF reception shall be less than for a 0 dB echo with frequency separation equal to 10 Hz and a delay of 20 us corresponding to a Doppler shift of 5 Hz after AFC compared to a 0 dB echo with frequency separation equal to 1 Hz and a delay of 20 us corresponding to a Doppler shift of 0 5 Hz after AFC for mode 8K 64 QAM R 3 4 A Ty 1 4 4 2 3 12 Synchronisation for varying echo power levels in single frequ2. 211 penne aces cee e ee ca aeaeaaae cases ceaaaeaeeeceseeeseeeenaeeeseeeeseees 8 1 Minimal functionality 2 sense aces 8 1 2 Infraredregeiver freQUency 8 1 3 1 eee eee ee eee a eee eines 8 1 4 Mangia eles linea ena hel eee 8 2 Alternative 040 0 8 3 Reliability elie ee el ais ile deeds 8 31 ae ea seat alee eee 63 24 Environmental sinus a A eae He ee 8 38 NAGY Vile Fei aaa he ed en T 8 4 Radkaging Sada eee 9 COMpllanGe aes A cea a ee Ge 9 1 Healt and safety 3 2 nasties clea eee Ne ie teat 9 2 Electromagnetic compatibility EMC 9 3 10 550 5 5 862 2009 Edition 1 Contents concluded Page Table 1 Priority order for parameters used for each channel Tab
3. An additional text message shall indicate when parameters are out of tolerance for instance Low signal level or Poor quality signal 7 2 7 5 Factory reset The STB decoder shall include the provision for restoring the factory default settings in response to a user instruction This shall return the decoder to the state in which it left the factory with all locally stored data for instance user preferences PINs channel lists etc removed The factory reset function shall also be triggered by a defined sequence of key presses of the front panel buttons i e without the need for RCU If parental control is applied the factory default setting shall be parental control disabled 34 SANS 862 2009 Edition 1 7 2 7 6 Favourite channels It shall be possible for the user to select preferences for particular channels but not to delete reorder or rename channels The channel screen shall provide a list of all services currently stored within the STB decoder memory It shall also allow the user to select and unselect any of the available services as a preferred channel This selection of channels will constitute a user defined channel line up that can be navigated with the lt gt and lt gt keys of the RCU when the favourite mode is activated The favourite channels screen also allows the user to activate and deactivate the favourite mode 7 2 7 7 Language selection Menus shall be available for each of the follow
4. fitted with TV aerial IEC connectors IEC 60169 2 one male and one female at either end d A composite CVBS video stereo audio cable of at least 1 5 m terminated with RCA connectors e A remote control unit RCU complying with clause 8 together with AA or AAA sized batteries f A user manual g A quick guide in English and at least one other official language which contains a basic wiring diagram showing alternative connections for installations with and without a VCR and with and without baseband video and audio input to the television display 11 Packaging The STB decoder shall be securely packaged to protect it against possible damage during transit The packaging shall contain all the accessories in clause 10 and the following information shall be visible on the outside of the packaging Manufacturer s identification Decoder model number Decoder serial number SANS 41
5. 85 dBuV input shall lower than 60 dBc 4 3 Demultiplexing and decoding 4 3 1 Support of MPEG 4 The decoder shall support MPEG 4 AVC H 264 level 3 decoding for standard definition display only The transport stream shall comply with SANS 13818 1 and the video profile level shall be Main profile level 3 in accordance with ISO IEC 14496 10 The standard definition video resolution shall be 720 x 576 4 3 2 Service acquisition time 18 SANS 862 2009 Edition 1 The STB decoder shall implement all reasonable measures to reduce the time taken for changing channels Where services are not encrypted the time to acquire a service shall be typically 500 ms but shall not exceed 750 ms where the required service is carried in the same transport stream as the current service and typically 750 ms but shall not exceed 1000 ms where the required service is in a different transport stream 4 3 3 Video 4 3 3 1 Support for active format descriptor The STB decoder shall handle 16 9 widescreen and 4 3 picture format changes including support for the correct aspect ratio and use of the active format descriptor AFD as defined in 154 The combination of coded frame aspect ratio information plus the use of the AFD embedded by the MPEG encoder into the video sequence header shall provide the viewer withthe following options a 16 9 material on 4 3 displays The decoder shall provide the following viewer o
6. Check Check digit digit digit digit digit digit digit digit digit digit digit digit digit Digit Meaning 1 2 Manufacturer Code Allocated by free to air broadcasting service licensees 3 4 Manufacturer model number Selected by manufacturer 5 Transmission Type e g 1 DTT Selected by manufacturer 6 12 Consecutive numbers 13 14 Two check digits using an approved cyclic redundancy check digit scheme The format of the number shall be ASCII 6 Applications 6 1 MHEG 5 application environment 26 SANS 862 2009 Edition 1 The STB decoder shall operate in accordance with MHEG 5 ISO IEC 13522 5 1997 in accordance with the broadcast profile ETSI ES 202 184 6 2 Electronic programme guide and cached applications For the South African DTT networks all cached applications and Electronic Programme Guide EPG data shall be downloaded in a file carouseled as a private data service The STB decoder shall download this file while in passive standby if the broadcast file has a later version number or date than the stored file In the standard running mode this file shall be decompressed into RAM for the EPG data together with a directory of stored applications Applications shall only be decompressed when they are called The EPG shall use MHEG based application to provide the EPG function The MHEG based application will be provided to manufacturers by the free to air broadcasting service licensees South Af
7. VHF 174 MHz to 238 MHz and 246 MHz to 254 MHz and UHF 470 MHz to 854 MHz to find all the multiplexes and services received in the complete frequency range It shall also be able to interpret respond to tuning parameters found in the SI PSI e g within the network information table NIT The decoder shall display a given service only once in the service list avoiding duplicates of the same service even if this service i e same path comprising original network identifier transport stream identifier and service identifier is received from more than one transmitter In such an example the service emanating from the transmission with the highest quality as defined by signal strength and signal quality shall be the one chosen to be entered into the service list The complete decoder automatic tuning function shall take no more than five minutes During the scanning procedure the priority in table 1 shall be observed in order to minimise the tuning time MFN environment 11 SANS 862 2009 Edition 1 Table 1 Priority order for parameters used for each channel 1 2 3 Priority order FFT mode Guard interval 1 8K 1 8 2 8K 1 4 3 8K 1 16 4 8K 1 32 Note that frequency planning may move to a single frequency network SFN basis for local repeaters and in this case the recommended priority for scanning by guard interval should be changed to 1 8 1 4 1 32 1 16 respectively for the 8K
8. transport streams including Mandatory and Optional PSI SI tables 4 6 2 Networks and bouquets It is anticipated Bouquets will be allocated on a regional basis Services will be broadcast on both a national and regional basis with the SI tables containing information on all events The STB decoder shall use the descriptors in the Bouquet Association Table and the Logical Channel Numbering 21 5 5 862 2009 Edition 1 functionality to construct accurate Now and Next information for the region identified in the appropriate Menu screen 4 6 3 Service configuration NOTE Itis anticipated that the DTT service will include a dynamic element in terms of the use of available bandwidth The STB decoder shall automatically detect configuration changes such as service information table 9 modulation table 8 and frequency 4 1 as well as the adding and or the deleting of services and shall amend its operation accordingly without user intervention or disruption to services 4 6 4 EIT present following EIT other and EIT schedule EIT tables will only contain Now and Next information including extended event Information for services carried all DTT transport streams EIT present following including genre tables parental control and series descriptor EIT schedule will not be broadcast Schedule information for a full function EPG will be carried in a compressed format within Private Data streams 4 6 5 Time exclusive
9. LED 1 shall be defined as the Power LED on the left hand side LED 2 shall be defined as the Status LED on the right hand side The colours of the Power LED shall be Red Green The colours of the Status LED shall be Red Green The Power LED Red Green Standby Red Operate Green 24 SANS 862 2009 Edition 1 Reception of RCU command flashing single burst Status LED Red Green System boot program search flashing Green Normal operation continuous Green Fault no signal found continuous Red Software download in progress flashing Red 4 11 2 Controls The following controls shall be provided on the front panel Programme selector P and Volume selector V and Standby On 4 11 3 Connectors The following connectors shall be used a RF input type IEC female in accordance with IEC 60169 2 RF output connector type IEC male in accordance with IEC 60169 2 c Colour coded RCA sockets for composite CVBS video and stereo audio 2 5 mm power jack minimum_rating of 1 5 A the centre as 12 V and the outer contact as earth USB 2 0 port via a USB type A jack for future use f Optional A C8 power inlet in accordance with SANS 60320 1 if the power supply is built into the STB decoder 4 11 4 Identification The decoder shall have a label with the following information Manufacturer s Supplier s identification Decoder Decoder serial num
10. QAM 5 6 15 6 16 7 8 16 0 64 1 2 16 5 19 0 64 2 3 18 7 23 2 64 3 4 20 2 27 6 64 5 6 21 6 64 7 8 22 5 4 2 3 6 Minimum decoder input signal levels The STB decoder shall provide QEF reception in both the VHF and the UHF bands for the minimum signal levels Pmin derived as follows Piin dBm 105 2 dBm NF 7 dBm C N dBm 13 SANS 862 2009 Edition 1 where NF equals noise figure and C N is specified table 2 The required minimum signal levels are summarized in table 3 Table 3 Minimum signal input levels Pmin for QEF reception with 1 4 guard interval and FFT size 8K Minimum input level Modulation Code rate Pimin dBm Profile 1 Gaussian Profile 2 0 QPSK 1 2 93 1 89 4 4 2 3 7 Maximum STB decoder input signal levels The decoder shall provide QEF reception for DVB T signals up to an input level of 35 dBm maximum in the presence of an analogue TV signal input level of 20 dBm maximum where the analogue TV signal is defined as the r m s value of the vision carrier at peaks of the modulated envelope This maximum DVB T signal input level is valid for the following combination of modes 8K 64 QAM R 2 3 A T 1 8 8K 64 QAM R 2 3 A T 1 4 8K 64 QAM R 3 4 A T 1 4 where R is code rate and Ty is useful symbol time 14 SANS 862 2009 Edition 1 4 2 3 8 STB decoder immunity to analogue signals in oth
11. South Africa Part 1 Conventional system 16 A 250 V a c SANS 213 CISPR 13 Sound and television broadcast receivers and associated equipment Radio disturbance characteristics Limits and methods of measurement SANS 528 2 ISO 639 2 Code for the representation of names of languages Part 2 Alpha 3 code SANS 894 Test methods for SD and HD level integrated receiver decoders SANS 2200 CISPR 20 Sound and television broadcast receivers andassociated equipment Immunity characteristics Limits and methods of measurement SANS 13818 1 ISO IEC 13818 1 Information technology Generic coding of moving pictures and associated audio information Systems SANS 13818 3 ISO IEC 13818 3 Information technology Generic coding of moving pictures and associated audio information Part 3 Audio SANS 60065 IEC 60065 Audio video and similar electronic apparatus Safety requirements SANS 60320 1 60320 1 Appliance couplerssfor household and similar general purposes General requirements SANS 60799 IEC 60799 Electrical accessories Cord sets and interconnection cord sets SANS 61000 3 2 IEC 61000 3 2 Electromagnetic compatibility EMC Part 3 2 Limits Limits for harmonic current emissions equipment input current lt 16 A per phase SANS 61000 3 3 IEC 61000 3 3 Electromagnetic compatibility EMC Part 3 3 Limits Limitation of voltage changes voltage fluctuations and flicker in public low voltage
12. The Main Menu shall contain the following options a Channels b Languages c Interactivity d Guide Settings including installation Each of these options shall link to a set of supplementary screens of information configuration options as defined below 7 2 3 Channels screen The channels option shall provide access to The channels list TV and radio The Now and Next Banner 7 2 3 1 Channels list The STB decoder shall be able to store 999 individual channels Following any frequency scan channels shall be stored in the order of their logical channel number user shall be able scroll through the list of channels and tune to the highlighted channel with single key press on lt OK gt The user shall be able to access the now and next event information for the highlighted channel 7 2 3 2 Now and Next Banner The STB decoder shall be able to present the user with information on the present and following event on any channel The Now and Next Banner shall present this information allowing the user to navigate the present and following event information for each channel to access the event description of a minimum of 30 SANS 862 2009 Edition 1 300 characters for each event to set a reminder on any following event and to tune to the highlighted channel 7 2 4 Languages The languages option shall access a list of languages available for the programme currently running including in a sing
13. by the free to air broadcasters 8 1 4 Operation 8 1 4 1 Response time The design of the STB decoder and RCU operating system shall ensure a maximum time of 100 ms in between the release of the key and the commencement of the specified response 8 1 4 2 Channel entry All television radio and interactive services will be assigned a three digit logical channel number LCN The RCU shall be configured for three digit LCN operation 8 1 4 3 End key rollover The design ofthe keypad and the RCU operating system shall prevent unintended repeated entries This shall include delay of 100 ms between the completion of a key press the recognition of the next entry 8 2 Alternative RCU design It is recommended that manufacturers make available alternative RCUs for those with impaired vision or impaired manual dexterity e g over sized keys and character fonts shaped keys 8 3 Reliability 8 3 1 Robustness 39 5 5 862 2009 Edition 1 RCU shall be designed to withstand frequent usage with robust case that is resistant to damage from being dropped onto hard surfaces or sat upon 8 3 2 Environmental The RCU shall be designed to work in the same environmental conditions i e ambient temperature and humidity as specified for the STB decoder 8 3 3 Key life The design of the key mechanism shall be such as to provide a minimum of 5 years operation under normal expected usage 8 4 Packaging The s
14. issued after the production date will immediately be recognised and processed as part of the initial setting up operation 7 User interface 28 SANS 862 2009 Edition 1 Note The user interface specification will be provided by the free to air broadcasting service licensees or their appointed agents see foreword 7 1 Now and Next Banner 7 1 1 Operation The STB decoder shall be capable of displaying a banner message containing key information for the service and event currently accessed The banner shall contain the following minimum information where this is signalled the SI If the required information is not present in SI the decoder shall leave the relevant field blank The banner shall include a Name and logical channel number for the current service b Name of the current event c Start and end time of the current event d Parental control rating for the current event e Name and start time of the following event f Service options It shall also be possible to access extended event information via single press of a key on the RCU whilst the Now and Next Banner is displayed Service options refers to an indication of the presence of additional languages subtitling interactive services audio description and other options associated with the current event These options shall be selectable from the RCU and not require access to the Menu screens 7 1 2 Banner triggering The Now and Next Banner shall be t
15. standby mode with the main CPU disabled but Rx function active and the re modulator bypass active Passive standby shall have an acquisition time from standby of not more than 10 seconds as specified in 4 9 4 4 9 2 Active standby operation In case it is not possible to provide a true low power passive standby the STB decoder shall provide an active standby state After selecting standby the decoder shall remain in active standby for 5 minutes before switching to passive standby This mode shall support the downloading of data including STB decoder control information if this capability is installed to the STB decoder Flash memory if this capability is installed 4 9 3 Processor wake up timer The STB decoder shall include a wake up timer It shall enter active standby during the wake up period which should last for 1 hour or until any download that is in progress is complete Whilst in active standby the decoder shall tune to the multiplex carrying the Engineering Service so that updates canbe identified and downloaded if applicable It shall not be possible to disable the timer but the wakeup time shall be adjustable NOTE The wake up timer is a means to reduce broadcast bandwidth EPG data software downloads and download of interactive applications shall take place during this time See also support for cached applications 4 9 4 Power up times The decoder shall generate an on screen message within ten seconds o
16. subtitle language shall be presented The decoder shall provide the option of disabling the language presented or of selecting another available language The presence of subtitle services shall be indicated by a subtitle icon on the Now and Next Banner When the languages button is selected on the remote control the list of available subtitle languages shall be displayed and the user can select his preference The decoder shall be capable of displaying subtitling and interactive graphics simultaneously where available 4 5 Teletext MHEG 5 shall be used to provide all teletext like services 4 6 Service information SI and programme specific information PSI 4 6 1 Sl tables The general implementation of 1 and PSI shall be in accordance with SANS 300 744 and SANS 300468 Table 9 summarises the 51 table structure and mandatory optional descriptors as defined in SANS 300468 SI Table Actual transport stream Other transport stream NIT Mandatory Optional BAT Mandatory N A SDT Mandatory Optional EIT present following Mandatory Optional EIT schedule Optional See Note 1 Optional See Note 1 TDT Mandatory N A TOT Optional N A RST Optional N A NOTE 1 EIT schedule will not be required assuming use of an MHEG based full function EPG as described in Section 6 2 The STB decoder shall be able to process the PSI SI tables both for the Actual and for Other
17. supply systems for equipment with rated current lt 16 per phase not subject to conditional connection SANS 61000 4 2 61000 4 2 Electromagnetic Compatibility EMC Part 4 2 Testing and measurement techniques Electrostatic discharge immunity test SANS 61000 4 3 IEC 61000 4 3 Electromagnetic compatibility EMC Part 4 3 Testing and measurement techniques Radiated radio frequency electromagnetic field immunity test SANS 61000 4 4 IEC 61000 4 4 Electromagnetic Compatibility EMC Part 4 4 Testing and measurement techniques Electrical fast transient burst immunity test SANS 61000 4 5 IEC 61000 4 5 Electromagnetic Compatibility EMC Part 4 5 Testing and measurement techniques Surge immunity test SANS 862 2009 Edition 1 SANS 61000 4 11 61000 4 11 Electromagnetic compatibility EMC Part 4 11 Testing and measurement techniques Voltage dips short interruptions and voltage variations immunity tests SANS 300468 ETS 300468 Digital Video Broadcasting DVB Specification for Service Information 51 in DVB systems SANS 300744 ETSI EN 300744 Digital Video Broadcasting DVB Framing structure channel coding and modulation for digital terrestrial television 3 Definitions and abbreviations 3 1 Definitions For the purpose of this document the following definitions apply audio description an ancillary service primarily provided for the visually impaired that provide
18. the screen after 1 minute of acquiring the service as a screen saver 8 Remote control unit 8 1 Minimum functionality 8 1 1 Protocol Each STB decoder shall be supplied with an RCU with which the full functionality of the decoder shall be operated The decoder shall use the standardised RCU protocol given below In the interest of interoperability it is recommended that manufacturers use the NEC protocol for the RCU 38 SANS 862 2009 Edition 1 8 1 2 Infrared receiver frequency The infrared carrier frequency for the RCU shall be 38 KHz 8 1 3 Keys and layout It shall be possible to perform the following functions by means of the RCU a enter the programme channel number via numeric keys b access and navigate the menu structure c access the electronic programme guide now and next banner and event and programme information d confirm an option selection control the on screen cursor up down left right f exit from the menu and information structure g select the next service up or down h increase or decrease the audio level i adjust the audio level to zero mute and restore back to previous setting j display and suppress subtitles k toggle between normal and standby operation toggle between television and radio services m provide a shortcut to interactive services and overlay text The RCU shall have four application keys to be defined The design requirements for the will be provided
19. with the DVB subtitling specification SANS 300743 for the hearing impaired The decoder shall be capable of overlaying the subtitle text on the picture The hearing impaired subtitles may differ from the normal subtitles by the number of text displayed per second which is controlled bythe broadcasted content The decoder shall be capable of displaying subtitles of the eleven official languages when transmitted The order of the transmitted subtitle services will be determined by the broadcaster The language codes of the transmitted subtitle descriptors shall be as given below in accordance with SANS 528 2 ISO 639 2 Code forthe representation of names of languages Part 2 Alpha 3 code Afrikaans Afrikaans afr English English eng Ndebele IsiNdebele nbl Sotho Northern Sepedi nso Sotho Southern Sesotho sot Swati SiSwati ssw Tsonga Xitsonga tso Tswana Setswana tsn Venda Tshivenda ven Xhosa IsiXhosa xho Zulu IsiZulu zul 20 SANS 862 2009 Edition 1 The decoder shall provide the option of Enabling or Disabling the displaying of subtitles When enabled subtitles will automatically be displayed When disabled the decoder shall allow manual selection from the available list of broadcasted subtitle services The decoder shall allow the user to configure the preferred first and second language subtitle services which will be automatically displayed when available Should neither be available the first available
20. 2 4 Response to changes in 00 102 01 De Deae ereer 4 2 5 Bypass 0 4 22 00 00 4 2 6 datas clade 4 3 Demultiplexing coding 1 6 4 31 Support of 4 0 5 4 3 2 Service acquisition time 2 4 3 3 6 AIBA A AUGIOS eek a co gad 4 4 he Ok deg dete diet ae he aes 4 5 Teletext oaie otai ae 4 6 Service information SI programme specific information PSI 4 6 Sl tables ani 5 Nepal elidel anes 4 6 2 Networks and bouquets 4 6 3 Service COnfighration 4 6 4 EIT present following EIT other and EIT schedule 4 6 5 Time eEXCIUSIVESEFVICES 4 7 lt NN i ee ed ae 4 8 Graphics 5 aces GO Agere 4 81 E
21. 4 8 2 Multiple display planes 4 9 Stand Dy Gp Oratlon A athe 4 91 Passive standby Operation 4 9 2 Active standby Operation 4 9 3 Processor Wake up timer 40 0 4 9 4 Power Up times ii onde nesting has nde kell 4 9 5 Power CONSUMPTION 2224 121 1 0 4 10 lt Meet vad sedans ENA AN a 4 111 LED Indications Mee teat ea east ayer eae eee aes ATS COMMECIO S is N14 ett ee SANS 862 2009 Edition 1 Contents continued Page 5 STB decoder control 5 1 Requirements 5 2 Menu operation 5 3 ST DTT identification number 6 shoe a a esata oe ate iat a 6 1 5 application environment ccccccecccceecececeeeeeeeeeaeceeeeeeesecseaeeeeeeeeeeeeteneaees 6 2 Electronic programme guide and cached applications 6 3 Secure downloads and Updates 6 31 Sup
22. B decoder 7 2 7 2 1 Country and regional set up The user shall be required to select from a number of options to show where the STB decoder is located and the preferred language options Country selection A single entry showing South Africa Regional selection A pull down menu of specified regional names shall be used to derive the appropriate channel listings for use by the EPG It shall be possible to amend the regional setting should the decoder be transferred to another region Language selection Pull down menus for each of the following each containing specified language options Menu controlling the language used in the menu screens Audio configuring the preferred audio component Subtitles configuring the preferred subtitling component In each case the default language shall be English It shall be possible to override the selected preferences selections made from the event based Now and Next Banner 32 SANS 862 2009 Edition 1 7 2 7 2 2 Channel scanning Channel scanning shall cover the complete range of frequencies between 174 MHz and 854 MHz Three options shall be available rescan of the required frequency range to locate and add new or changed services The deletion of all stored settings and subsequent scan storage of new ones scan of a single multiplex manual search entry of the channel number to be searched When the rescan option is selec
23. DRAFT SOUTH AFRICAN STANDARD DSS PUBLIC ENQUIRY STAGE Document number 74 862 4 Reference SANS 862 Date of circulation 6 February 2009 Closing date 10 March 2009 Number and title SANS 862 200x Set top box decoder for free to air digital terrestrial television Remarks PLEASE NOTE The technical committee SABS TC 74 responsible for the preparation of this standard has reached consensus that the attached document should South African standard It is now made available by way of public enquiry to all interested and affected parties for public comment and to the technical committee members for record purposes Any comments should be sent by the indicated closing date either by or by fax e mail to SABS Standards Division Attention Compliance and Development department Private Bag X191 Pretoria 0001 Fax 012 344 1568 for attention dsscomments E mail dsscomments sabs co za Any comment on the draft must contain in its heading the number of the clause subclause to which it refers A comment shall be well motivated and where applicable contain the proposed amended text The public enquiry stage will be repeated if the technical committee agrees to significant technical changes to the document as a result of public comment Less urgent technical comments will be considered at the time of the next amendment THIS DOCUMENT IS A DRAFT CIRCULATED FOR PUBLIC COMMENT IT MAY NOT BE REFERR
24. E Manufacturers may emulate EEPROM in Flash in which case some parts of this data must be enciphered in the NVRAM The memory specification has been chosen to allow for the lowest component price assuming the use of NAND Flash but manufacturers are free to propose alternative technologies such as a hybrid solution making use of NOR and NAND Flash where these meet the requirements of this specification 4 8 Graphics capabilities 22 SANS 862 2009 Edition 1 4 8 1 Resolution Colour resolution shall be 16 bits and the STB decoder shall include a look up table capable of storing a minimum of 256 x 24 bit RGB colour transparency entries 4 8 2 Multiple display planes The STB decoder shall have four display planes with the capability of blending these with active video A minimum of 16 individual transparency levels shall be supported e Graphics plane front plane Supporting full screen MHEG 5 graphics On Screen Display information The sizing of the graphics display plane shall be 4 3 aspect ratio regardless of the video aspect ratio e Video plane Supporting a full screen MPEG video stream or still image e Image plane Supporting a single full screen MPEG still image GIFs JPEGs and PNGs e Background plane back plane single colour 24 bit RGB background gt with a default setting of black 4 9 Standby operation 4 9 1 Passive standby operation Passive standby shall be provided and shall be the main
25. ED TO ASA SOUTH AFRICAN STANDARD UNTIL PUBLISHED AS SUCH IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL TECHNOLOGICAL COMMERCIAL AND USER PURPOSES DRAFT SOUTH AFRICAN STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME STANDARDS TO WHICH REFERENCE MAY BE MADE IN LAW AZ96 10 2008 08 08 sabs pta ISBN 978 0 626 SANS 862 2009 Edition 1 SOUTH AFRICAN NATIONAL STANDARD Set top box decoder for free to air digital terrestrial television Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001 Tel 27 12 428 7911 Fax 27 12 344 1568 CES www sabs co za SABS SANS 862 2009 Edition 1 Table of changes Change No Date Foreword This South African standard was approved by National Committee SABS TC 74 Communication technology in accordance with procedures of the SABS Standards Division in compliance with annex 3 of the WTO TBT agreement This SANS document was published in xxxxx 2009 At various places in the standard reference is made to broadcasting service South Africa this means the free to air individual broadcasting service licensees or their appointed agents trusted third parties Contacts for these licensees are South African Broadcasting Corporation e tv Head of Regulatory Chief Operating Officer Auckland Park 5 Summit Road Johannesburg Hyde Park Johannesburg Int
26. al terrestrial television digital video broadcasting DVB Terrestrial electrically erasable programmable read only memory event information table electronic programme guide effective protection target forward error correction fast Fourier transform free to air International Electrotechnical Commission International Organisation for Standardisation logical channel number multi frequency network multimedia and hypermedia information coding experts group moving picture experts group Nippon Electric Company noise figure near instantaneous companded amplitude modulation network information table NVRAM PAL PCM PIN PSI QAM QEF QPSK RCU RF RGB r m s RST SANS SDT SFN SI SSU STB TDT TOT TPS UHF VCR VHF non volatile random access memory phase alternating line pulse code modulation personal identification number program specific information quadrature amplitude modulation quasi error free quaternary phase shift keying code rate remote control unit radio frequency red green blue root mean square running status table South African national standard service description table single frequency network service information system software update set top box time and date table time offset table transmission parameter signalling useful symbol time television ultra high frequency video cassette recorder very high frequency SANS 862 2009 Edition 1 SANS 862 2009 Edit
27. ber 5 STB decoder control 5 1 Control requirements 25 SANS 862 2009 Edition 1 The minimum hardware and software requirements for STB Control shall be implemented according to the specification titled STB contro for free to air DTT decoders in South Africa Manufacturers can obtain the STB control specification from the free to air broadcasting service licensees in South Africa or their appointed third party see foreword 5 2 Menu operation The Menu Structure shall include a dedicated page for STB Control support accessed from the Main menu page This shall contain the unique South African DTT identification number plus headings for the following minimum information a System name maximum 10 characters b Software Version Number maximum 8 characters 5 3 SA DTT Identification Number Each STB decoder shall have a unique SA DTT Identification number stored securely in fully Write Protected non volatile memory This number shall be the same as the serial number of the STB decoder The decoder serial number will be a maximum 14 digits Only 10 of the digits will comprise the unique address Numbering shall be fromthe most significant digit first and shall be numbered as follows South African DTT Identification Number Manufacturers Manufacturer Transmission Unique Serial Number ID Model Type Number 17 274 37 4 5 digit 67 77 8 09 7 40 117 112
28. date within the time out period Where an update is requested for later the decoder shall take no action until next placed in standby when it will first complete the update process Advisory messages and indications shall be provided to the user as defined above If an STB decoder is not placed in standby within 24 hours of an applicable code update being detected the decoder shall initiate the update process at the following local time of 03h00 as determined from the appropriate SI tables 6 3 3 Over air updates Over air updates shall use the DVB System Software Update mechanism DVB SSU specified in ETSI TS 102 006 The STB decoder shall ensure the security of downloaded data by use of a digital signature mechanism specified by the free to air broadcasting service licensees The update operation shall not interfere with the normal operation of the STB decoder Each software release shall have a unique model version reference which shall be used by the decoder to establish whether it is to be downloaded The decoder shall only respond to updates containing this unique identifier In particular the decoder shall not respond to updates targeted at other decoder models produced by the same manufacturer The system shall allow for separate test keys to enable lab and field trial tests of new software without affecting the in field population of STB decoders Decoders shall be supplied with the download mode enabled such that any updates
29. dition 1 where K is an integer from 21 to 68 NOTE Fora DVB T signal an 8 MHz channel corresponds to a signal bandwidth of 7 61 MHz 4 2 3 4 Maximum frequency offset The STB decoder shall be able to receive signals with an offset of up to 125 kHz from the nominal centre frequency 4 2 3 5 Carrier to noise ratio The C N ratio shall be less than one uncorrected error event per hour over the entire frequency range NOTE This requirement is given as quasi error free QEF in SANS 300744 and 10 to 11 at the input of the MPEG demultiplexer The carrier to noise C N ratio values in table 2 are specified for two profiles Profile 1 Gaussian noise is applied together with the wanted carrier lin a signal bandwidth of a DVB T signal No echo is applied Profile 2 The wanted carrier includes the direct path signal and The echo has the same power 0 dB echo as the direct path signal and is delayed from 1 95ys 0 95 times the guard interval length and has 0 degree phase at the channel center Table 2 Required C N for QEF reception with1 4 guard interval and FFT size 8K 1 2 3 4 Modulation Code rate Profilet Gaussian Profile 2 0 dB echo QPSK 1 2 5 1 8 8 QPSK 2 3 6 9 13 7 QPSK 3 4 7 9 17 4 QPSK 5 6 8 9 QPSK 7 8 9 7 16 1 2 10 8 13 3 16 QAM 2 3 13 1 17 9 16 QAM 3 4 14 6 22 1 16
30. duction concluded The MHEG 5 standard application environment in accordance with ISO IEC 13522 5 has been selected for easy integration The South African profile of MHEG 5 does not allow a return path but the MHEG 5 roadmap will provide return path capability For the South African DTT networks cached applications and data are used to avoid the high bandwidth needs of carousels The STB decoder is not required to accommodate high definition services Although this standard is applicable only to free to air DTT set top box decoders any other set top box decoder which is capable of receiving the free to air DTT services should ensure that the services and applications are displayed fully without any alteration or hindrance Control means are required to prevent subsidised STB decoders from being used outside South Africa and to allow stolen decoders to be disabled The main functional elements specified for security are asecure over the air software and bootstrap loader a unique serial number SA DTT Identification number amechanism to prevent STB decoders from functioning innon RSA DTT networks and mechanism using the unique SA DTT identification allowing stolen STB decoders to be disabled The detailed security requirements are not specified in this standard The STB decoder manufacturer is responsible for the implementation of the security requirements specified by the free to air individual broadcasting servic
31. e licensees in South Africa and for the proper configuration of the chipsets Manufacturers can obtain the security information from the free to air individual broadcasting service licensees South Africa or from their appointed agents trusted third parties see foreword SANS 862 2009 Edition 1 Contents Foreword aces eine een ene die awe ete ee ae T SCOpa teeter ee ee 2 Normative eet eee ade eet eae 3 Definitions and abbreviations 321 Den MUONS iii thea ort 3 2 Abbreviations 5 200 011 4 Performance requirements 41 Spectrum DTT modulation coding 2 22 1 00000 4 1 1 Nee ea tees 4 1 2 modulation coding 2 0 4 2 en 4 2 1 DTT tuner demodulaton 4 2 2 VUNG gt ts 4 2 3 Tuner performance 4
32. egment is found to contain an error the loader shall repeat the download for that segment alone rather than restart the whole process The download function employed in the STB decoder shall be approved by the free to air broadcasting service licensees or the appointed trusted third party The decoder shall check for the presence of an applicable code update whenever power is applied or whenever the decoder comes out of standby The decoder shall check for updates at least every 7 days if a check has not been triggered by the above An applicable code update is one which is labelled as 27 5 5 862 2009 Edition 1 a intended for the specific hardware build of the STB decoder and b being a later version number than the code currently stored in Flash On detecting the presence of an applicable code update the STB decoder shall present an advisory message to the user and prompt one of three responses Update now Update later Do not update Where the user requests an immediate update the decoder shall commence the update process whilst displaying a dynamic indication of its progress Should the update process fail to complete the decoder shall abort the process once an error is detected or after a time out period of 10 minutes from initiation Unique error messages shall be displayed for either failure to complete the download of the new data failure of the CRC check failure to complete the up
33. ency networks For these modes 8K 64 QAM R 2 3 A T 1 8 8K 64 QAM R 2 3 A T 1 4 8K 64 QAM R 3 4 A T 1 4 the reception shall be QEF at the C N ratio specified in table 6 below defined at 0 dB level crossing when the channel contains two paths with relative delay from 1 95 us up to 0 95 times guard interval length and the relative power levels of the two paths are dynamically varying including 0 dB echo level crossing Table 6 C N ratio for QEF reception with dynamically varying echo power levels 4 2 3 13 performance in single frequency networks If there more than FFT window positions for the time synchronisation that will give aggregate available C N 1 larger than or equal to the required the STB decoder shall be able to find one of these positions independently of echo profile The decoder shall also be able to correctly equalise the signal for echoes up to 7T 24 the interval of correct equalization for an 8 MHz DVB T signal up to 260 us For these modes 8K 64 QAM R 2 3 A T 1 8 8K 64 QAM R 2 3 A T 1 4 8K 64 R 3 4 A T 1 4 16 SANS 862 2009 Edition 1 the C N ratio for Profile 2 specified in 4 2 3 5 for QEF reception shall be obtained when the channel contains two static paths with relative delay from 1 95 us up to 0 95 times guard interval length independently of the relative amplitudes and phases of the two paths For a specific echo atte
34. er channels The decoder shall maintain QEF reception with adjacent channel PAL I carriers of up to 33 dB higher power levels NOTE In South Africa the PAL FM sound carrier level relative to the vision carrier is 13 dB and the level of the NICAM signal relative to the vision carrier is 20 dB On channels other than adjacent channels QEF reception shall be maintained with analogue PAL carriers up to 44 dB higher than the wanted DVB T signal This applies to DVB T transmissions with the combination of modes given in 4 2 3 7 4 2 3 9 STB decoder immunity to digital signals in other channels In table 4 the lowest values are given of the interference to wanted signal level ratio 1 at which the decoder shall maintain QEF performance the presence of an interfering DVB T signal This requirement applies to DVB T transmissions with the combination of modes given in 4 2 3 7 Table 4 Minimum required for QEF reception with interfering DVB T signals Channel frequency raster Minimum C dB _ Chs Other Chs Image Chs 4 2 3 10 Immunity to co channel interference from analogue TV signals The sensitivity for interference from analogue is specified as the minimum carrier to interference ratio C l required for QEF reception The STB decoder shall operate at QEF at values specified table 5 below when 8 MHz DVB T signal is exposed to interference from a co channel PAL I signal including video with teletext
35. f the start of a reboot operation confirming that the STB decoder is powering up 23 5 5 862 2009 Edition 1 The following time limits will apply to transitions in and out of standby operation a STB decoder Off to Service display maximum 20s b Active Standby to Service display maximum 5 s Passive Standby to Service display maximum 10s 4 9 5 Power consumption The decoder together with its power supply shall have the following maximum power consumption Normal Operation 10W Standby Active 6 W Standby Passive 3 W NOTE These values will be reviewed to reduce energy consumption when technology permits 4 10 Power supply The STB decoder shall be capable of operating over a voltage range of 10 8 V 0 14 4 V with a socket for connection to a 12 V source Both protection against reversed polarity shall be incorporated In addition the decoder may have the optional capability of a 230 V 10 mains supply The mains supply power unit may at the discretion of the manufacturer be incorporated within the decoder or be external 4 11 Interfaces 4 11 1 LED indications The STB decoder shall have a minimum of two bi colour LED s LED 1 and LED 2 on the front panel The two LED s shall be clearly distinguishable from each other either by their physical position separation left side right side LED or by means of a label
36. hall be included the same shipping carton as the STB decoder The internal packaging shall be sufficient to prevent any damage or scuffing to during transit Batteries to be provided separately and packaged to prevent accidental short circuiting during transit 9 Compliance 9 1 Health and safety The STB decoder and all accessories shall comply with SANS 60065 9 2 Electromagnetic compatibility EMC The STB decoder and all accessories shall comply with the following standards Emissions SANS 213 Immunity SANS 2200 The following test methods shall be used SANS 61000 3 2 SANS 61000 3 3 SANS 61000 4 2 Test Level 4 kV contact 8 air SANS 61000 4 3 Test Level 10 V m SANS 61000 4 4 Test Level3 SANS 61000 4 5 Test Level 4 SANS 61000 4 11 9 3 Performance Compliance of the STB decoder and RCU with the performance requirements shall be tested using the relevant test methods given in SANS 894 10 Accessories The STB decoder shall be supplied with the following accessories a A 230 V a c to 12 V d c converter in the case of an external power supply b A mains cord set of at least 1 5 m complying with SANS 60799 and incorporating a plug complying with SANS 164 1 and an appliance connector C7 complying with SANS 60320 1 in the case of an internal power supply 40 SANS 862 2009 Edition 1 c An RF flexible coaxial 75 ohm cable of at least 1 5 m RG6 or equivalent double screened
37. he standards indicated below Information on currently valid national and international standards can be obtained from Standards South Africa ETR 154 Digital Video Broadcasting DVB Implementation guidelines for the use of MPEG 2 systems video and audio in satellite cable and terrestrial broadcasting applications ETR 211 Digital broadcasting systems for television sound and data services Guidelines on the implementation and usage of DVB service information 51 ETSI ES 202 184 MHEG 5 Broadcast Profile ETSI ETS 300 743 Digital Video Broadcasting DVB DVB subtitling systems ETSI TS 102 006 DVB System Software Update 550 IEC 60169 2 Radio frequency connectors Part 2 Coaxial unmatched connectors IEC 60728 5 Cable networks for television signals sound signals and interactive services Part 5 Headend equipment 5 5 862 2009 Edition 1 ISO IEC 13522 5 Information technology Coding of multimedia and hypermedia information Part 5 Support for base level interactive applications ISO IEC 13818 7 Information technology Generic coding of moving pictures and associated audio information Part 7 Advanced Audio Coding AAC ISO IEC 14496 3 Information technology Coding of audio visual objects Part 3 Audio ISO IEC 14496 10 Information technology Coding of audio visual objects Part 10 Advanced Video Coding SANS 164 1 Plugs and socket outlets for household and similar purposes for use in
38. in until a language has been selected This language selection shall define the language of all subsequent menus b Region selection the user shall be able to select the region if provided c Aspect ratio 4 3 or 16 9 the user shall be able to select the aspect ratio d Signal acquisition mode the user shall be able to select automatic scan or manual channel selection i Automatic scan if the user selects this option the full UHF and VHF band in this specification is scanned The output of the decoder re modulator shall be preset to an agreed frequency selected to avoid co channel interference in the majority of cases The sound channel shall be muted until such time as a valid program is presented At completion of the scanning the following shall be displayed Signal found plus the network information table NIT that shall include the types and number of services available the current software version an indication of signal quality strength Subsequently the available program with the lowest program number shall be selected The Now Next Banner shall be displayed for 3 seconds ii Manual _ channel selection an entry field shall be presented where the user can enter a specific channel number If at the completion of a full channel scan the signal is too weak or not found the screen shall display Signal not found and Press OK on
39. ing Menu controlling the language used in the menu screens Audio configuring the preferred audio component Subtitles configuring the preferred subtitling component In each case the default language shall be English It shall be possible to override the selected preferences for audio and subtitles by selections made from the languages ist for which information is extracted from the SI EIT 7 2 7 8 Now Next Banner display time There shall be a setting to control the duration that the Now and is displayed Values for the display time options can be defined between 1 sand 10 in increments of 500 ms 7 2 7 9 Parental control Parental control parameters support the operation of parental control as described in 7 5 including the setting and resetting of PINs for both content access and access to the parental control settings the activation of the parental control mode and the setting of the age threshold 35 SANS 862 2009 Edition 1 7 3 Operation at first time switch on The STB decoder when shipped by the manufacturer shall not have any preset information stored in the NVRAM When the decoder is switched on for the first time and it detects that the NVRAM is clear a banner shall be displayed indicating that no preset information is present The following sequence of configuration screens shall be displayed a Language the user shall be able to select the language The language menu shall rema
40. ion 1 YUV a signal defined as colour space luminance Y and colour difference U V 10 SANS 862 2009 Edition 1 4 Performance requirements 4 1 Spectrum and DTT modulation and coding 4 1 1 Spectrum The STB decoder shall operate within the VHF and UHF television broadcasting bands using 8 MHz channel spacing In South Africa the UHF band ranges between 470 MHz to 854 MHz The VHF band is 174 MHz to 238 MHz and 246 MHz to 254 MHz 4 1 2 DTT modulation and coding The STB decoder shall support 8K mode of operation referenced to the DVB T standard SANS 300744 The decoder shall be capable of achieving full specified performance with any of the combinations of modulation QPSK 16QAM 64QAM forward error correction coding guard interval as specified in SANS 300744 4 2 Radio frequency 4 2 1 DTT tuner demodulator The STB decoder shall be provided with a single DTT tuner demodulator for the reception of signals from terrestrial transmitters broadcasting in accordance with SANS 300744 It shall be capable of receiving transmissions broadcast with any allowable combination of modulation and transmission parameters as follows Modulation constellation QPSK 16 QAM 64 QAM Outer Coding FEC 1 2 2 3 3 4 5 6 7 8 Guard Interval A T 1 4 1 8 1 16 1 32 Transmission mode 8K 4 2 2 Tuning 4 2 2 1 Automatic tuning The STB decoder shall be capable of performing automatic tuning over the following frequency ranges
41. it shall be possible to select other services put the decoder into standby etc but these actions shall not reset the timer and the error message shall be displayed whenever the user returns to that event 7 5 3 Configuration The Menu structure shall include provision for user configuration of parental control settings including the resetting of the PIN sequence changing the PIN sequence and setting the minimum age trigger level Events higher then the parental rating selected by the user shall be blocked for viewing and allow viewing of content with a lower rating In the absence of a parental rating for an event all content shall be parentally blocked The factory default setting shall be parental control disabled Table 10 defines the ratings that will be used initially but the STB decoder shall support alternative ratings as defined in ETR 211 i e minimum age rating 3 years Table 10 Parental control ratings for South Africa 7 6 Operation with radio services If a radio service is selected the STB decoder shall display the relevant Now and Next banner once the service is acquired The banner has the same functionalities and navigation opportunities as for TV channels Optionally if details event information is available the banner shall not time out and shall remain on screen unless alternative content is signalled within SI in which case the banner should time out as for a television service The banner shall move over
42. le 2 Required C N for QEF reception with 1 4 guard interval and FFT size 8k Table 3 Minimum signal input levels for QEF reception with 1 4 guard interval FFT size 8K Table 4 Minimum required for QEF reception with interfering DVB T signals Table 5 C I dB for QEF in presence of co channel analogue TV carrier Table 6 C N ratio for QEF reception with dynamically varying echo power levels Table 7 Echo attenuation Table 8 Modulation parameters for DVB T Table 9 Sl table structure Table 10 Parental control ratings for South Africa SANS 862 2009 Edition 1 Set top box decoder for free to air digital terrestrial television 1 Scope 1 1 This standard sets out the minimum technical requirements for a set top box decoder for free to air standard definition digital terrestrial television in South Africa The standard concerns e broadcasters e broadcasting signal distributors and e decoder manufacturers 1 2 This standard does not cover integrated digital television IDTV 2 Normative references The following standards contain provisions which through reference in this text constitute provisions of this standard All standards are subject to revision and since any reference to a standard is deemed to be a reference to the latest edition of that standard parties to agreements based on this standard encouraged to take steps to ensure the use of the most recent editions of t
43. le list audio options subtitles options and audio description Each language shall be accompanied by an icon defining the option as either audio subtitle or audio description The list always includes a minimum of 2 items the default audio of the programme and no subtitle Pressing lt OK gt on any of the options shall activate it and close the list If available the same list can be accessed with the language key on the RCU 7 2 5 Interactivity The interactivity option shall access the interactive services The list or portal presented from this option shall include the interactive applications transversal to the platform games magazines MHEG portal etc as well as the service bound application for the current channel if one is available The screen triggered from this option is the same as the one displayed when pressing the interactivity key on the RCU The navigation in the interactive applications shall be defined the application s editor and be made possible with specified keys as given in the user manual Menu shall always include an option to exit the application 7 2 6 Electronic Programme Guide EPG This option shall access a channel guide with a list of programmes organised by channel number based on the extended EPG data for the whole depth of the EPG Optionally the guide can include additional patterns of organisation of the extended EPG data for example by time slots genre etc The channel guide sha
44. ll be made available for all channels whether TV or radio The programmes shall be organised by start end time by default The channel guide shall show a minimum of 5 programmes The guide shall present navigation shortcuts to the next page or further point in the list if not organized by pages and to the next day If the current programme video and sound is allowed to continue after the launch of the guide the decoder shall allow the channel to be changed by using the lt gt and lt gt keys of the RCU and possibly the numeric keys Programme information includes title service on which it is broadcast start and end time genre available Janguages service options ratings synopsis short description All of this information shall be made available from any event presented in the guide although not necessarily from the programme list 31 5 5 862 2009 Edition 1 7 2 7 Settings 7 2 7 1 General The settings option accesses a settings menu providing access to all configuration screens including user preferences and installation Installation screens are intended for infrequent access by the user primarily at initial installation and where manual updates are required The following options are presented Technical parameters or installation Favourite channels Languages Display Parental control 7 2 7 2 Installation menu This menu includes all parameters that affect the proper functioning of the ST
45. mode 4 2 2 2 Manual tuning In addition to automatic tuning the STB decoder shall be capable of performing manual tuning where the channel number and or frequency is entered by the viewer decoder shall tune to this channel search all available DTT modes add any new services and replace existing services the service list The decoder shall display a given service only once the service 115 sosavoiding duplicates of the same service even if this service i e same path comprising original network identifier transport stream identifier and service identifier is received from more than one transmitter In such a case the service emanating from the transmission with quality as defined by signal strength and signal quality shall be the one chosen to be enter d into the service list 4 2 3 Tuner performance 4 2 3 1 Noise The maximum noise level of the decoder tuner shall not exceed 7 dB across the operational frequency range 4 2 3 2 Return loss Input return loss measured at the antenna input shall be equal to or less than 6 dB 75 ohm across the operational frequency range 4 2 3 3 Centre frequencies and signal bandwidth The decoder tuner shall be capable of tuning to the centre frequency fe of the incoming DVB T signal as follows a VHF tuning fe 178 MHz 4 8 MHz where K is an integer from 4 to 13 b UHF tuning fe 306 MHz K 8 MHz 12 SANS 862 2009 E
46. nuation the C N ratio shall have approximately the same value independent of the actual delay length The deviation in C N ratio from the median value shall be less than 1 dB for any echo length from 1 95 us up to 0 95 times guard interval length For echoes outside the guard interval for 8 MHz DVB T signal QEF reception shall be possible with echo levels up to the values defined in table 7 Table 7 Echo attenuation ee a Delay us ae a ANAS 74 9 erom Ran 22 6 wa na wa oa wa 6 22 4 2 4 Response changes in modulation The STB decoder shall recover automatically from any change in the modulation parameters as defined in table 8 continuing to provide an error free transport stream after recovery Recovery shall take a maximum of one second for any one change order to minimise this time the decoder shall be able to detect change of modulation parameter signalled the TPS data of the transmitted signal 8 Modulation parameters for DVB T Forward error Guard interval Modulation correction FEC 1 2 QPSK 16QAM DES Da 4 2 5 Bypass support The path from RF input to RF output shall allow RF bypass independently of the operational or stand by status of the decoder so that connected equipment e g TV set can continue to ope
47. port for downloads 6 3 2 Secure download function 6 3 3 2 422 N Geaa 1 er a a Seed 71 Now and next banner 00424 0 0 N ros de geese Dent dee 71 2 Banner triggering 52 cicinve te Oh ROA 7 2 MENU 1 111 5 5 7 21 7 2 2 Main menu screens 7 3 Operation at first time switch on 7 4 Time and date information 7 5 Parental Control 7 9 1 gt 7 5 2 On screen MESSAGES 7 5 3 COMPGUPATION ran i a antag 7 6 Operation with radio services 22 02 2 8 Remote control unit
48. ptions Display the material as a 16 9 letterbox within a 4 3 frame Perform 4 3 centre cut out on the originating material and present this full frame within the 4 3 display or b 4 3 material on 16 9 displays The decoder shall allow pillarboxing of 4 3 material into a 16 9 frame in order to maintain the correct aspect ratio of the originating material 4 3 3 2 Support of still pictures The STB decoder shall be able to decode and display still pictures frame i e a video sequence containing a single intra coded picture Such a video bit stream will cause the buffer to under flow In this situation while the decoding process shall continue to examine the buffer the display process associated with the decoder shall repeat the previously decoded picture until the normal operation of the buffer can resume 4 3 3 3 Outputs PAL I modulated video and audio signal shall be presented a female connector in accordance with IEC 60169 2 The decoder shall also provide a composite CVBS video output from an RCA connector 4 3 4 Audio 4 3 4 1 Standards The STB decoder shall support MPEG 1 Layer 1 amp 2 Musicam with 32 44 1 and 44 kHz sampling in accordance with SANS 13818 3 The decoder shall also comply with HE AAC v2 encoding in accordance with ISO IEC 14496 3 and ISO IEC 13818 7 19 5 5 862 2009 Edition 1 At the minimum manual attenuation setting the decoder shall provide an audio o
49. rate 17 5 5 862 2009 Edition 1 The RF bypass gain shall be in the range 1dB to 3 dB over the frequency range 174 MHz to 254 MHz and 470 MHz to 854 MHz 4 2 6 UHF re modulator The STB decoder shall provide a UHF re modulated output for use with a PAL TV receiver which shall a modulate the decoded baseband signal onto PAL I in accordance with ITU R rec 624 4 except that dual side bands shall be allowed b have a peak signal level of 3 mV nominal across 75 ohm 39 dBm c have a return loss at the output less than 6 dB d be tunable from 470 MHz to 854 MHz e be preset at the factory to channel 63 f support PAL mono audio output with a volume control g have a male output connector in accordance with IEC 60169 2 h have an audio FM deviation of 40 kHz 5 kHz at 12 dB full scale transmitter output setting equivalent to 6 dBm studio sound level i have a vision to sound carrier ratio of 16 4 dB j produce spurious output levels no greater than in band 174 2 254 MHz and 470 MHz 854 MHz 12 max out of band 30 2 1 GHz excluding in band above 43 with the RF out terminated in 75 ohm exhibit an output voltage leakage to the RF in terminal of 36 dBuV maximum The output connector shall combined with an RF bypass facility providing feeds for analogue TVs and VCRs The second order intermodulation at the RF output measured to IEC 60728 5 with
50. rica The STB decoder shall implement an EPG using compressed schedule data carried private data the transport stream together with an MHEG based application to decompress and store the data and to display it on screen The EPG function shall be launched single press of a key on the RCU The schedule shall describe all services carried on the DTT FTA platform for that region for the following 7 days In order to provide a timely response when the EPG function is selected the decoder shall cache both the MHEG EPG application and the schedule data whenever it is not in standby mode free to air broadcasting service licensees will provide the application for managing the caching process 6 3 Secure downloads and updates 6 3 1 Support for downloads The STB decoder control function shall not prevent over the air downloads of authorised software 6 3 2 Secure download function The STB decoder operating system shall include a download function supporting the partial or total updating of any code stored in Flash a code update All downloads shall be subject to authentication by a double signature process with downloads signed by both the manufacturer and the body responsible for the engineering channel on the DTT frequency network To support lt reliable downloads the loader shall be capable of starting from any segment the download and of receiving subsequent segments any order Where a downloaded s
51. riggered by a single press of a key on the or the completion of a channel change operation The banner shall not be triggered at event boundaries The banner shall be generated within less than 1 s of the trigger action and remain on screen for a configurable display time The banner display time shall be controlled via a parameter field in the STB decoder configuration menu screen The minimum display time shall be 1 and the maximum display time shall be 10 5 in increments of 500 ms 7 2 On screen Menu 7 2 1 Operation 7 2 1 1 General The Main Menu shall provide access to all functional features of the STB decoder via a structured and explicit organisation of these features Shortcuts might be provided to access any of the features with a direct access from the remote control in addition to the regular access from the menu 7 2 1 2 Ability to modify menu contents 29 SANS 862 2009 Edition 1 It shall be possible to modify the contents structure and operation of the menu structure via the over air update mechanism This shall include the addition of further options within existing pages and also the addition of further pages to the menu structure 7 2 1 3 PIN access option The STB decoder shall provide the option of requiring the entry of a menu access PIN before displaying the parental control menu and allowing access to its option screens The operation of this function is defined in 7 5 7 2 2 Main Menu screen
52. rmation The STB decoder shall suppress both video and audio if the parental rating is above the configuration threshold for the event Unblocking of a parentally blocked event shall be done through the entering of a parental pin Once the event has been unblocked it shall remain unblocked for the duration of the event A change away from the channel back again shall not require PIN re entry within the timescale of that event When a higher rating is applied to an unblocked event the unblocked event shall be blocked and the user will be required to re enter the parental pin Checking of parental control status and subsequent content suppression if appropriate shall apply across all state transitions e g at switch on coming out of standby at channel change and at event boundaries Parental control pin shall be reset by performing a reset to factory settings The factory default setting shall be parental control disabled 7 5 2 On screen messages If the user has enabled parental control and the rating of the current event is above the trigger level the STB decoder shall request the entry of a 4 digit parental control PIN before allowing access to the event 37 SANS 862 2009 Edition 1 If an incorrect PIN is entered the decoder shall generate an error message and request re entry After 5 incorrect attempts the decoder shall advise the user that no further attempts can be made for a period of 10 minutes During this period
53. roduction Digital terrestrial television DTT broadcasting is introduced in South Africa from 1 November 2008 Initially the service will be available in parallel with the existing analogue network but it is anticipated that the analogue network will be switched off from November 2011 The DTT transmissions South Africa utilize the MPEG 4 coding standard The transmission standard will be DVB T in accordance with SANS 300744 The transmissions the VHF and UHF bands The objective of this standard is an STB decoder which in conjunction with an analogue television receiver will provide good quality images for the viewer All the requirements of this standard are mandatory Where the standard is silent on a feature it is regarded as being optional The inclusion of optional features can being part of the marketing strategy of the manufacturer This standard sets requirements for a free to air set top box decoder for DTT that will result in a low cost low maintenance unit providing basic functionality i e decoding DTT broadcasts to provide baseband and UHF modulated outputs and an electronic program guide EPG providing details of the available services However the STB decoder should also be capable of providing interactive services and control means that will allow decoders to be disabled and to prevent them from being utilized outside South Africa SANS 862 2009 Edition 1 Intro
54. s spoken description of the video component of a service digital terrestrial television DTT the terrestrial delivery of digital transmissions in the UHF VHF frequency bands using the DVB T standard as set out in SANS 300744 Multiplex Mux a group of digital terrestrial television DTT channels that are combined together into one output signal for broadcast private data stream the DVB data stream designed for specific application which is ignored by other DVB decoders that are not designed to use the data set top box decoder STB decoder decoder a stand alone device that converts a DVB T signal to analogue video and audio signals for presentation on a television receiver or other suitable display device 3 2 Abbreviations and symbols For the purpose of this standard the following abbreviations and symbols apply AD audio description AFC automatic frequency control AFD active format descriptor BAT bouquet association table BER bit error rate Bw bandwidth SANS 862 2009 Edition 1 C N C N I CA COFDM CPU CRC CVBS DMO DTT DVB DVB T EEPROM EIT EPG EPT FEC FFT FTA IEC ISO LCN MFN MHEG MPEG NEC NF NICAM NIT carrier to noise ratio ratio of carrier to noise plus interference conditional access coded orthogonal frequency division multiplexing central processing unit cyclic redundancy check composite video baseband signal Digital Migration Office Digital Dzonga digit
55. services The STB decoder shall support the use of time exclusive services i e where part of the multiplex capacity is used to support different services depending upon the time of the day The services shall be shown within the relevant channel listings and users shall be able to select them as for normal services During the time period when a service is not using the multiplex capacity the service is inactive the decoder shall display an MHEG based notification screen the Placeholder which will typically provide the service name and its hours of operation If no MHEG application is available a standard message shall be displayed This service is not currently available The location and parameters of the Placeholder screens will_be signalled as part of the SI system The decoder shall provide seamless transitions between active and inactive states so that the user experiences the replacement of the Placeholder screen with the active service and vice versa When a service is signalled as inactive the decoder shall not present any component video audio subtitling interactive applications associated with that service 4 7 Memory The STB decoder shall have memory capacity of 256 Mbytes Flash memory 64 Mbytes RAM Settings and parameters e g security related data shall be stored in non volatile memory There shall be 200 Mbytes of free Flash memory the STB decoder dedicated for broadcasters use NOT
56. ted the default operation shall be to scan all applicable channels however there shall also be a manual option allowing the user to limit the specific channel Where the deletion option is selected an on screen warning shall be provided that this action will delete the currently saved channels During all scanning operations the STB decoder shall provide an indication of progress by displaying the number of the channel currently being scanned and the number of services located Where a multiplex is encountered the decoder shall display details of its name and network identification together with the signal strength and quality Where more than one multiplex is found to contain the same services the decoder shall prioritise the one having the best signal strength and quality decoder shall ensure that there is no duplication of entries in the channel list The decoder shall take not more than 5 minutes_to complete a full scan of the frequency range between 174 MHz and 854 MHz 7 2 7 2 3 TV settings Aspect ratio Letterbox 4 3 Widescreen 16 9 Video output Control of whether YUV or RGB 15 provided on the optional component outputs RF modulator It shall be possible switch off the RF modulator unit It shall be possible to select the output UHF channel number 7 2 7 3 Service updates The service update screen shall contain details of the current software and firmware versions stored in
57. the STB decoder In addition an indication of whether updates are available shall also be provided A Scan Update option shall allow the user to check for updates 33 5 5 862 2009 Edition 1 Where updates are available an Initiate Update option shall allow the user to start the update process manually rather than wait for the normal update during standby operation 7 2 7 4 System information and diagnostics A Diagnostics screen shall provide the following information Hardware and Software version numbers Middleware and other resident application version numbers list of the received multiplexes along with indications of both signal strength and error rates The unique serial number and state of the STB decoder The signal strength and error rate indications shall be shown as a bar on screen It shall be colour coded Green Yellow Red to indicate in tolerance marginal out of tolerance conditions The display shall be supported by a text description Signal strength OK Signal strength marginal Signal strength too low When a multiplex entry is selected a further screen containing the following details shall be displayed a Channel number and transmitter b Signal strength and average error rate c Network ID and COFDM mode List of Services carried in the transport stream by logical channel number Indications of Service availability CA protected parental control setting etc
58. the remote control unit for help The status LED shall display continuous red If the OK key is pressed the scan process shall be interrupted and a help screen presented displaying the following text information Signal too weak or not found Check that the antenna is correctly installed and connected to the STB decoder 36 SANS 862 2009 Edition 1 Refer to your quick guide for further information or contact the following help lines for more support Help line telephone numbers Software version number Press OK on the remote control unit to exit this page and resume signal search The above configuration screens shall remain displayed until a selection has been made or the Exit Back key is pressed These screens shall not be presented at any subsequent switch on if the NVRAM contains preset information 7 4 Time and date information The STB decoder shall use the time and date information carried in the relevant SI tables to provide an On screen display in the following screens e Menu Page e Now and Next Banner 7 5 Parental control 7 5 1 Operation It shall be possible to apply parental control on individual events and complete channels Parental control for individual channels shall be implemented as part of the channel store and preferences function Parental control function for eventor channelshall be controlled by the parental rating contained in the EPG SI EIT info
59. utput level of 1 5 V r m s 3 dB across 10 k ohm at 0 dB full scale for each of the left and right channels 4 3 4 2 Multiple audio channels Alternative language audio components may be available for some services The decoder shall identify the presence of such alternatives when a service is acquired The default selection shall be driven by the language selected by the user during initial configuration of the decoder However if available the decoder shall signal the presence of alternative languages within the Now and Next Banner 4 3 4 3 Audio description The audio description operation shall be configured within the On Screen Menu system The presence of audio description for a particular event shall be indicated the Now and Next Banner The audio description channel will be selectable via the On Screen Menu and will mixed feed in the decoder once the audio description option has been selected There shall control for the main audio There shall be separate volume control for the audio description channel within the settings menu The audio description shall be presented on the right channel when selected by the user The main audio output shall be presented on the left channel in mono only 4 3 4 4 Mono audio There shall be a configurable option in the On screen Menu to replace Stereo Left with a Mono feed 4 4 Subtitling The decoder shall be capable of displaying subtitles in accordance
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