{"id":228867,"date":"2024-10-19T14:53:04","date_gmt":"2024-10-19T14:53:04","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-en-60728-52016\/"},"modified":"2024-10-25T08:59:40","modified_gmt":"2024-10-25T08:59:40","slug":"bs-en-60728-52016","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-en-60728-52016\/","title":{"rendered":"BS EN 60728-5:2016"},"content":{"rendered":"
This part of IEC 60728<\/span> <\/span> specifies the characteristics of equipment used in the headends of terrestrial broadcast and satellite receiving systems (without satellite outdoor units and without those broadband amplifiers in the headend as described in IEC 60728\u20113<\/span> <\/span>). The satellite outdoor units for fixed satellite systems (FSS) are described in ETSI ETS 300 158<\/span> <\/span>, and for broadcast satellite systems (BSS) in ETSI ETS 300 249<\/span> <\/span>. Test methods for both types (FSS and BSS) of satellite outdoor units are laid down in ETSI ETS 300 457<\/span> <\/span>.<\/p>\n This part of IEC 60728<\/span> <\/span><\/p>\n covers the frequency range 5 MHz to 3 000 MHz;<\/p>\n<\/li>\n identifies performance requirements for certain parameters;<\/p>\n<\/li>\n lays down data publication requirements for certain parameters;<\/p>\n<\/li>\n stipulates methods of measurements;<\/p>\n<\/li>\n introduces minimum requirements defining quality grades (Q-grades).<\/p>\n<\/li>\n<\/ol>\n This part of IEC 60728<\/span> <\/span> specifies the overall characteristics for upstream\/downstream signals between external sources\/sinks (for example, antennas, cable modem termination systems, etc.) and the system interface to the cable network. In the case of modular headend systems, single equipment items such as modulators, converters, etc. are also described. Cable modem termination systems, encrypters, decrypters, etc. are not described in this part of IEC 60728<\/span> <\/span>. If such equipment is used in headends, the relevant parameters for RF, video, audio and data interfaces should be met.<\/p>\n According to the definitions in 3.1<\/span>, the headends are divided into the following three quality grades:<\/p>\n Grade 1: central headend;<\/p>\n<\/li>\n Grade 2: hub headend or hubsite;<\/p>\n<\/li>\n Grade 3: MATV headend\/individual reception headend.<\/p>\n<\/li>\n<\/ul>\n Figure 1<\/span> shows the block diagram of a headend consisting of typical processing units with the corresponding interfaces at the input and output.<\/p>\n [Image removed.]<\/i><\/p>\n For IP interfaces, specifications from the transmission standard ETSI TS 102<\/span> 034<\/span> are taken into account where applicable. The content of the data streams can be digital video, audio or other digital data.<\/p>\n The necessary characteristics and parameters of equipment such as IP gateways or IP interfaces on equipment at the input of headends ( Figure 2<\/span>) as well as at the output of headends ( Figure 3<\/span>) are described in CLC\/TR 50083\u20115\u20111<\/span> <\/span>.<\/p>\n Equipment at the input of headends can be either IP gateways which enable the connection to a Digital Video Broadcasting-Asynchronous Serial Interface (DVB-ASI) headend infrastructure according to EN 50083\u20119<\/span> <\/span> or, in the case of modular headend systems, can also be single equipment with IP interfaces such as DVB modulators, transcoders, multiplexers and FM radio processors as shown in Figure 2<\/span>. Edge devices are also covered by CLC\/TR 50083\u20115\u20111<\/span> <\/span>.<\/p>\n [Image removed.]<\/i><\/p>\n Equipment at the output of headends can be either IP gateways which enable the connection from DVB-ASI interfaces according to EN 50083\u20119<\/span> <\/span> to IP based networks or, in the case of modular headend systems, can also be single equipment with IP interfaces such as encoders, multiplexers and switches as shown in Figure 3<\/span>.<\/p>\n [Image removed.]<\/i><\/p>\n Cable networks for television signals, sound signals and interactive services – Headend equipment<\/b><\/p>\n\n
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PDF Catalog<\/h4>\n
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\n PDF Pages<\/th>\n PDF Title<\/th>\n<\/tr>\n \n 8<\/td>\n English
CONTENTS <\/td>\n<\/tr>\n\n 15<\/td>\n FOREWORD <\/td>\n<\/tr>\n \n 17<\/td>\n INTRODUCTION <\/td>\n<\/tr>\n \n 18<\/td>\n 1 Scope <\/td>\n<\/tr>\n \n 19<\/td>\n Figures
Figure 1 \u2013 Example of headend <\/td>\n<\/tr>\n\n 20<\/td>\n Figure 2 \u2013 Examples of IP gateways\/interfaces at the input of headends <\/td>\n<\/tr>\n \n 21<\/td>\n 2 Normative references
Figure 3 \u2013 Examples of IP gateways and interfaces at the output of central headends <\/td>\n<\/tr>\n\n 23<\/td>\n 3 Terms, definitions, symbols and abbreviations
3.1 Terms and definitions <\/td>\n<\/tr>\n\n 27<\/td>\n 3.2 Symbols <\/td>\n<\/tr>\n \n 28<\/td>\n 3.3 Abbreviations <\/td>\n<\/tr>\n \n 30<\/td>\n 4 Methods of measurement
4.1 Methods of measurement for digitally modulated signals
4.1.1 General
4.1.2 Basic assumptions and measurement interfaces
4.1.3 Signal level for digitally modulated signals <\/td>\n<\/tr>\n\n 32<\/td>\n 4.2 Single-channel intermodulation specification for channel amplifier and frequency converter <\/td>\n<\/tr>\n \n 33<\/td>\n 4.3 Three-carrier intermodulation measurement
Figure 4 \u2013 Frequencies and levels of test carriers
Tables
Table 1 \u2013 Test signal levels for the different television standards in decibels relative to reference level <\/td>\n<\/tr>\n\n 34<\/td>\n 4.4 Two carrier intermodulation measurements for second- and third-order products
4.4.1 General
Figure 5 \u2013 Test carrier and interfering products in the pass band
Table 2 \u2013 Test signal levels in decibels relative to reference level <\/td>\n<\/tr>\n\n 35<\/td>\n 4.4.2 Intermodulation products with test signals at frequencies fa and fb
4.4.3 Signal levels
4.5 Carrier-to-spurious signal ratio at the output
4.5.1 Carrier-to-spurious signal ratio at the output of equipment for AM TV systems
Figure 6 \u2013 Example showing products formed when 2fa > fb <\/td>\n<\/tr>\n\n 36<\/td>\n 4.5.2 Carrier-to-spurious signal ratio at the output of equipment for FM TV systems
Figure 7 \u2013 Carrier-to-spurious signal ratio at the output
Table 3 \u2013 Test signal levels for sound and vision carriers in decibels relative to reference level <\/td>\n<\/tr>\n\n 37<\/td>\n 4.5.3 Shoulder attenuation
Figure 8 \u2013 Carrier-to spurious signal ratio at the output
Figure 9 \u2013 Shoulder attenuation <\/td>\n<\/tr>\n\n 38<\/td>\n 4.6 Signal-to-noise measurement
4.6.1 Television carrier-to-noise ratio (analogue modulated signals)
Figure 10 \u2013 Arrangement of test equipment for carrier-to-noise ratio measurement <\/td>\n<\/tr>\n\n 40<\/td>\n Table 4 \u2013 Noise bandwidth <\/td>\n<\/tr>\n \n 41<\/td>\n 4.6.2 RF signal-to-noise ratio (SD,RF\/N) for digitally modulated signals <\/td>\n<\/tr>\n \n 42<\/td>\n 4.7 Differential gain and phase for PAL\/SECAM signals
4.7.1 General <\/td>\n<\/tr>\n\n 43<\/td>\n 4.7.2 Differential gain (for PAL\/SECAM only) <\/td>\n<\/tr>\n \n 44<\/td>\n 4.7.3 Differential phase <\/td>\n<\/tr>\n \n 46<\/td>\n Figure 11 \u2013 Arrangement of test equipment for measurement of differential gain and phase
Figure 12 \u2013 Signal D2 waveform
Figure 13 \u2013 Example of modified staircase <\/td>\n<\/tr>\n\n 47<\/td>\n 4.8 Group delay measurements
4.8.1 Group delay variation of analogue TV signals
Figure 14 \u2013 Measuring set-up for determining the group delay variation <\/td>\n<\/tr>\n\n 48<\/td>\n 4.8.2 Procedure for the measurement of group delay variation on DVB channel converters
Figure 15 \u2013 RF signal (time domain) amplitude-modulated with a split-frequency signal <\/td>\n<\/tr>\n\n 49<\/td>\n Figure 16 \u2013 Spectral presentation of the group delay measurement <\/td>\n<\/tr>\n \n 50<\/td>\n Figure 17 \u2013 Description of the measuring set-up
Figure 18 \u2013 Choices of measuring aperture (value of the split frequency) for various measurement tests <\/td>\n<\/tr>\n\n 51<\/td>\n 4.9 Phase noise of an RF carrier
4.9.1 General
4.9.2 Equipment required <\/td>\n<\/tr>\n\n 52<\/td>\n 4.9.3 Connection of the equipment
4.9.4 Measurement procedure
4.9.5 Presentation of the results
Figure 19 \u2013 Test set-up for phase noise measurement <\/td>\n<\/tr>\n\n 53<\/td>\n Figure 20 \u2013 Mask for phase noise measurements
Table 5 \u2013 Frequency distances for phase noise measurement <\/td>\n<\/tr>\n\n 54<\/td>\n 4.10 Hum modulation of carrier
4.10.1 General
4.10.2 Description of the method of measurement
Figure 21 \u2013 Carrier\/hum ratio <\/td>\n<\/tr>\n\n 55<\/td>\n 4.10.3 Measuring procedure
Figure 22 \u2013 Test set-up for equipment with built-in power supply
Figure 23 \u2013 Test set-up for equipment with external power supply <\/td>\n<\/tr>\n\n 56<\/td>\n 4.10.4 Calculating the hum modulation ratio
Figure 24 \u2013 Oscilloscope display <\/td>\n<\/tr>\n\n 57<\/td>\n 4.11 2T-pulse response, K-factor <\/td>\n<\/tr>\n \n 58<\/td>\n 4.12 Chrominance-luminance delay inequalities (20T-pulse method)
Figure 25 \u2013 K-factor mask for quality grade 2 <\/td>\n<\/tr>\n\n 59<\/td>\n Figure 26 \u2013 Generation of 20T-pulse
Figure 27 \u2013 Example of amplitude and delay error using 20T-pulse <\/td>\n<\/tr>\n\n 60<\/td>\n 4.13 Luminance non-linearity
4.14 Intermodulation distortion (FM stereo radio)
4.14.1 General
Figure 28 \u2013 Staircase signal for measurement of luminance non-linearity before and after differentiation
Figure 29 \u2013 Example of a possible frequency combination displayed on a spectrum analyser <\/td>\n<\/tr>\n\n 61<\/td>\n 4.14.2 Equipment required
4.14.3 Connection of equipment
4.14.4 Measurement
4.15 Decoding margin (teletext)
4.15.1 General
Figure 30 \u2013 Arrangement of test equipment for intermodulation distortion <\/td>\n<\/tr>\n\n 62<\/td>\n 4.15.2 Method of measurement and measuring set-up (Figure 31)
4.15.3 Applicability of measuring set-up
5 Performance requirements and recommendations
5.1 Safety
5.2 Electromagnetic compatibility
5.3 Environmental
Figure 31 \u2013 Principal measuring set-up for determination of decoding margin <\/td>\n<\/tr>\n\n 63<\/td>\n 5.4 Marking
5.4.1 Marking of equipment
5.4.2 Marking of ports
6 Equipment characteristics required to be met
6.1 General
Table 6 \u2013 Publications for environmental requirements of headend equipment <\/td>\n<\/tr>\n\n 64<\/td>\n 6.2 Power supply voltage
6.3 RF signal requirements
6.3.1 Impedance (input)
6.3.2 Impedance (output)
6.3.3 Return loss (input, output) of equipment
6.3.4 Return loss (output) of headend
6.3.5 Typical back-off for digital against analogue signals
Table 7 \u2013 Return loss (input, output) of equipment
Table 8 \u2013 Return loss (output) of headend <\/td>\n<\/tr>\n\n 65<\/td>\n 6.3.6 Immunity against other signals in the FM radio and TV range
6.3.7 Carrier-to-spurious-signals ratio at output in the frequency range of 40\u00a0MHz to 862\u00a0MHz
Table 9 \u2013 Typical levels of digital signals with respect to analogue signals (back-off) <\/td>\n<\/tr>\n\n 66<\/td>\n 6.3.8 Image rejection for AM TV and FM radio
6.3.9 Carrier to local oscillator signal ratio at the output for AM TV and FM radio
6.3.10 Frequency stability
Table 10 \u2013 Carrier-to-spurious-signals ratio of digital modulated channel with respect to the peak level of an analogue TV carrier
Table 11 \u2013 Frequency stability for AM TV related to the nominal AM TV frequency <\/td>\n<\/tr>\n\n 67<\/td>\n 6.3.11 Phase noise of digital modulated signals at the output of the headend
Table 12 \u2013 Long-term frequency stability for digital modulated signals
Table 13 \u2013 Shoulder attenuation for digital modulated signals <\/td>\n<\/tr>\n\n 68<\/td>\n 6.3.12 In-channel group delay variation for digital modulated signals
Table 14 \u2013 Phase noise of a DVB signal (PSK and QAM)
Table 15 \u2013 Phase noise of a DVB signal (OFDM)
Table 16 \u2013 In-channel group delay variation for digital modulated signals <\/td>\n<\/tr>\n\n 69<\/td>\n 6.3.13 In-channel peak-to-peak amplitude response variation for digitally modulated signals
6.3.14 Stability of sound intercarrier
6.3.15 Stability of residual carrier amplitude
6.3.16 Frequency stability \u2013 SAT IF\/IF converter
Table 17 \u2013 In-channel peak-to-peak amplitude response variation of DVB signals
Table 18 \u2013 Stability of sound intercarrier
Table 19 \u2013 Stability of residual carrier amplitude <\/td>\n<\/tr>\n\n 70<\/td>\n 6.3.17 Typical modulation error ratio (MER) for a QAM signal
6.3.18 Minimum C\/N values at the output of the headend
6.4 Composite video signal requirements
6.4.1 Impedance
Table 20 \u2013 Frequency stability \u2013 SAT IF\/IF converter
Table 21 \u2013 Minimum requirements for MER for different QAM modulation schemes
Table 22 \u2013 C\/N values for converters at the headend output <\/td>\n<\/tr>\n\n 71<\/td>\n 6.4.2 Return loss
6.4.3 Signal voltage
6.4.4 Polarity
6.4.5 Offset voltage
6.5 Audio signal requirements
6.5.1 Input impedance
6.5.2 Output impedance
6.5.3 Signal level
Table 23 \u2013 Return loss
Table 24 \u2013 Signal voltage <\/td>\n<\/tr>\n\n 72<\/td>\n 6.6 Requirements for decoding margin (teletext)
6.7 IF signal requirements (AM-TV)
6.7.1 Impedance
6.7.2 Return loss
6.8 Antennas for terrestrial reception
6.8.1 Impedance
6.8.2 Return loss
6.9 Antenna amplifier
Table 25 \u2013 Signal level
Table 26 \u2013 Requirements for decoding margin (Teletext)
Table 27 \u2013 Return loss \u2013 IF signal
Table 28 \u2013 Return loss \u2013 Antennas for terrestrial reception <\/td>\n<\/tr>\n\n 73<\/td>\n 7 Equipment characteristics required to be published
7.1 General
7.2 Environmental conditions
7.3 Maximum permissible output level
Table 29 \u2013 Recommended temperature ranges
Table 30 \u2013 Carrier-to-third-order intermodulation ratio for maximum output level of channel amplifiers\/frequency converters
Table 31 \u2013 Carrier-to-third-order intermodulation ratio for maximum output level of sub-band, full band, multi-band amplifiers and multi-channel frequency converters for AM TV (not for channel amplifier) <\/td>\n<\/tr>\n\n 74<\/td>\n 7.4 Operating range for output level
7.5 TV standard
7.6 Clamp
7.7 Noise figure
7.7.1 Equipment without AGC
Table 32 \u2013 Carrier-to-second-order intermodulation ratio for maximum output level of sub-band, full band, multi-band amplifiers and frequency converters for AM TV or FM radio (not for channel amplifier)
Table 33 \u2013 Carrier-to-intermodulation ratio for maximum output level of FM-TV channel amplifiers\/frequency converters
Table 34 \u2013 Carrier-to-third-order intermodulation ratio for maximum output level of FM TV full band, sub-band amplifiers <\/td>\n<\/tr>\n\n 75<\/td>\n 7.7.2 Equipment with AGC
7.8 Data control signals, description of interface
7.9 Output level stability for TV modulators, TV converters and pilot generators
7.10 Pilot signal
Figure 32 \u2013 Example of diagram of NF, C\/N or S\/N for equipment with AGC
Table 35 \u2013 Output level stability for TV modulators, pilot generators and TV converters <\/td>\n<\/tr>\n\n 76<\/td>\n 7.11 Differential gain and phase
7.11.1 Differential gain
7.11.2 Differential phase
7.12 Group delay variation for analogue TV signals
7.13 Luminance non-linearity
Table 36 \u2013 Recommendation for differential gain
Table 37 \u2013 Recommendation for differential phase
Table 38 \u2013 Recommendation for group delay variation <\/td>\n<\/tr>\n\n 77<\/td>\n 7.14 2T-pulse
7.15 20T-pulse
7.16 Hum modulation
7.17 Television carrier-to-noise ratio
7.18 Audio in TV
Table 39 \u2013 Recommendation for luminance non-linearity
Table 40 \u2013 K-factor masks for 2T-pulse responses <\/td>\n<\/tr>\n\n 78<\/td>\n 7.19 Processing units for FM radio
7.19.1 Audio input
7.19.2 Stereo crosstalk
7.19.3 Total harmonic distortion
7.19.4 Intermodulation distortion
7.19.5 Deviation, pre-emphasis
7.20 Antennas for terrestrial reception
7.20.1 Antenna gain
7.20.2 Sidelobe suppression
7.20.3 Return loss of antennas
Table 41 \u2013 Recommendations for sidelobe suppression
Table 42 \u2013 Recommendation for return loss of antennas <\/td>\n<\/tr>\n\n 79<\/td>\n 7.21 Control signals for outdoor units <\/td>\n<\/tr>\n \n 80<\/td>\n Annexes
Annex A (normative) Definition of the specified test frequency range for return loss and noise figure
A.1 Test frequency range for TV channel processor
A.2 Test frequency range for sub-band, full-band and multi-band amplifiers
A.3 Test frequency range for an FM radio channel processor
Figure A.1 \u2013 Test frequency range for TV channel processors
Figure A.2 \u2013 Test frequency range for sub-band, full-band and multi-band amplifiers <\/td>\n<\/tr>\n\n 81<\/td>\n Figure A.3 \u2013 Test frequency range for an FM radio channel processor <\/td>\n<\/tr>\n \n 82<\/td>\n Annex B (informative) Audio connector for European system according to IEC 60130-9
B.1 Contact allocation and mechanical dimensions
B.2 Signal-to-pin allocations and applications
Figure B.1 \u2013 Contact allocation and mechanical dimensions
Table B.1 \u2013 Mechanical dimensions
Table B.2 \u2013 Signal-to-pin allocation
Table B.3 \u2013 Application <\/td>\n<\/tr>\n\n 83<\/td>\n Annex C (informative) Selectivity diagram for adjacent channel transmission
C.1 General
C.2 TV modulator for standard PAL B\/G with mono or stereo sound
Figure C.1 \u2013 Selectivity diagram for PAL B\/G with mono or stereo sound <\/td>\n<\/tr>\n\n 84<\/td>\n C.3 TV modulator for standard PAL B\/G with NICAM 728 in the lower adjacent channel
C.4 Standard PAL I
Figure C.2 \u2013 Selectivity diagram for PAL B\/G with NICAM 728 in the lower adjacent channel
Table C.1 \u2013 Selectivity table for PAL B\/G with mono or stereo sound <\/td>\n<\/tr>\n\n 85<\/td>\n C.5 Group delay for the standards B\/G, D\/D1\/K and I
C.6 Group delay pre-correction for TV modulator for standard B\/G
Figure C.3 \u2013 Selectivity diagram for PAL\u00a0I
Figure C.4 \u2013 Group delay mask for the standards B\/G, D\/D1\/K and I <\/td>\n<\/tr>\n\n 86<\/td>\n C.7 TV modulator for standard SECAM L
C.8 Group delay for TV modulator for standard SECAM L
Figure C.5 \u2013 Group delay pre-correction diagram for standard\u00a0B\/G
Figure C.6 \u2013 Selectivity diagram for SECAM L
Table C.2 \u2013 Group delay pre-correction table for standard\u00a0B\/G <\/td>\n<\/tr>\n\n 87<\/td>\n C.9 TV modulator for standard PAL D\/K with mono or stereo sound
Figure C.7 \u2013 Group delay mask for SECAM L
Figure C.8 \u2013 Selectivity diagram for PAL D\/K <\/td>\n<\/tr>\n\n 88<\/td>\n Annex D (informative) Differences in some countries
D.1 General
D.2 Finland, Sweden <\/td>\n<\/tr>\n\n 89<\/td>\n Annex E (normative) Correction factors for noise
E.1 Signal level measurement
E.2 Noise level measurement
Table E.1 \u2013 Noise correction factor <\/td>\n<\/tr>\n\n 90<\/td>\n Figure E.1 \u2013 Noise correction factor CF (dB) versus measured level difference D (dB) <\/td>\n<\/tr>\n \n 91<\/td>\n Annex F (informative) Digital signal level and bandwidth
F.1 RF\/IF power (“carrier”)
F.2 Occupied bandwidth of a digital signal
F.2.1 QAM\/QPSK modulation <\/td>\n<\/tr>\n\n 92<\/td>\n F.2.2 OFDM modulation
F.3 Noise bandwidth
F.3.1 General
Table F.1 \u2013 Total number of carriers and channel spacing for the OFDM modes (8 MHz channel) <\/td>\n<\/tr>\n\n 93<\/td>\n F.3.2 QAM\/QPSK\/8\u00a0PSK modulation
F.3.3 OFDM modulation
F.4 Equivalent signal bandwidth
F.4.1 General
F.4.2 QAM\/QPSK\/8\u00a0PSK modulation
F.4.3 OFDM modulation
F.5 Examples <\/td>\n<\/tr>\n\n 94<\/td>\n Table F.2 \u2013 Examples of bandwidths for digital modulation techniques <\/td>\n<\/tr>\n \n 95<\/td>\n Figure G.1 \u2013 Frequency tolerance of converted signals in the IF range <\/td>\n<\/tr>\n \n 96<\/td>\n Annex H (informative) Measurement errors which occur due to mismatched equipment
Figure H.1 \u2013 Error concerning return loss measurement
Figure H.2 \u2013 Maximum ripple <\/td>\n<\/tr>\n\n 97<\/td>\n Annex I (normative) Correction factor for spectrum analyser <\/td>\n<\/tr>\n \n 98<\/td>\n Bibliography <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" \n\n
\n Published By<\/td>\n Publication Date<\/td>\n Number of Pages<\/td>\n<\/tr>\n \n BSI<\/b><\/a><\/td>\n 2016<\/td>\n 100<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":228873,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[612,2641],"product_tag":[],"class_list":{"0":"post-228867","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-33-060-40","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/228867","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/228873"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=228867"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=228867"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=228867"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}