1、 AMERICAN NATIONAL STANDARD FOR TELECOMMUNICATIONS ATIS-0100502.2005(R2015) System M-NTSC Television Signals Network Interface Specifications and Performance Parameters As a leading technology and solutions development organization, ATIS brings together the top global ICT companies to advance the in
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5、ion (CITEL). For more information, visit . AMERICAN NATIONAL STANDARD Approval of an American National Standard requires review by ANSI that the requirements for due process, consensus, and other criteria for approval have been met by the standards developer. Consensus is established when, in the ju
6、dgment of the ANSI Board of Standards Review, substantial agreement has been reached by directly and materially affected interests. Substantial agreement means much more than a simple majority, but not necessarily unanimity. Consensus requires that all views and objections be considered, and that a
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8、ures not conforming to the standards. The American National Standards Institute does not develop standards and will in no circumstances give an interpretation of any American National Standard. Moreover, no person shall have the right or authority to issue an interpretation of an American National S
9、tandard in the name of the American National Standards Institute. Requests for interpretations should be addressed to the secretariat or sponsor whose name appears on the title page of this standard. CAUTION NOTICE: This American National Standard may be revised or withdrawn at any time. The procedu
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11、e of Disclaimer and (2) between the jurisdictions of one transmission service provider and another. This standard defines neither the interconnection nor the performance characteristics of specific apparatus or equipment. 1.2 Purpose The purpose of this standard is to assure the uniform application
12、of standard values of transmission parameters for television signals transported by portions of the telecommunications network. It is intended to provide a common understanding by both suppliers and their customers. 1.3 Application The primary applications of this standard are for specifying and eva
13、luating the performance of a transmission service provided by common carriers. These services are used to transport the audio and video portions of broadcast-quality television signals. ATIS-0100502.2005 2 2 NORMATIVE REFERENCES The following standard contains provisions which, through reference in
14、this text, constitute provisions of this American National Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this American National Standard are encouraged to investigate the possibility of applying the mo
15、st recent edition of the standard indicated below. ANSI/IEEE 743-1995, IEEE Standard equipment requirements and measurement techniques for analog transmission parameters for telecommunications.13 DEFINITIONS 3.1 Special word/phrase usage 3.1.1 exchange carrier (EC): The telecommunications common car
16、rier franchised to provide telecommunications services within one or more exchanges. An EC may also provide exchange access service, intra-LATA long-distance service, and - in some unusual cases - inter-LATA service. 3.1.2 hypothetical reference transport service channel: A hypothetical reference tr
17、ansport service channel is a model used to define administration and jurisdictional responsibilities. These models, discussed in clause 6, apportion transmission parameter values by facility lengths. Facility lengths specified as short haul, medium haul, satellite, long haul, and end-to-end are defi
18、ned in 6.4. 3.1.3 interexchange carrier (IC): A telecommunications common carrier authorized to provide telecommunications services between LATAs. An IC may also provide service within some LATAs. 3.1.4 local access and transport area (LATA): A geographic area established for the provision and admin
19、istration of telecommunications services. A LATA encompasses one or more exchanges that have been grouped to serve common social, economic, and other purposes. 3.1.5 network interface (NI): The point of demarcation between the carriers facilities and the customers installation that establishes the t
20、echnical interface and division of operational responsibility. 3.1.6 point of termination (POT): The point of demarcation between carriers that establishes the technical interface and division of operational responsibility. 3.1.7 transmission service channel: A one-way transmission path between two
21、designated points (see 6.3). 3.1.7.1 end-to-end: A transmission service channel employing various circuits, such as a terrestrial or satellite inter-LATA transmission service channel, in conjunction with its associated access transmission service channels. 3.1.7.2 long haul: A transmission service c
22、hannel with a route length of greater than 150 miles (241 km) but less than or equal to 3000 miles (4827 km). 3.1.7.3 medium haul: A transmission service channel with a route length of greater than 20 miles (32.2 km) but less than or equal to 150 miles (241 km). _ 1This document is available from th
23、e Institute of Electrical and Electronics Engineers (IEEE). ATIS-0100502.2005 3 3.1.7.4 satellite: A transmission service channel consisting of one transmitting earth station terminal, one satellite transponder (repeater) and one receiving earth station terminal. 3.1.7.5 short haul: A transmission s
24、ervice channel with a route length of 20 miles (32.2 km) or less. 3.2 Video signals 3.2.1 Video signal description The waveform terminology used throughout the standard is in accordance with Figure 1, in which the standard video-signal waveform terminology is shown and measured in IRE units as shown
25、 in Figure 2. 3.2.2 Test signal description Reference to time (T) in the description of the following test signals refers to the half-amplitude pulse width duration and not to the rise time nor to the fall time of a pulse transition, and has a value of 125 nanoseconds. 3.2.2.1 Composite test signal
26、The composite test signal shown in Figure 3 consists of a line bar (125-nanosecond rise time and fall time), a 2T pulse (250-nanosecond half-amplitude duration), a 12.5T chrominance pulse (1.5625-microsecond half amplitude duration), and a modulated 5-riser staircase signal superimposed upon standar
27、d synchronizing and blanking signals. Reference “A” and “B” are the measurement points utilized in the measurement of insertion gain and insertion-gain variation. 3.2.2.2 Combination test signal The combination test signal shown in Figure 4 consists of a white flag, a multiburst, and a 3-level chrom
28、inance signal superimposed upon standard synchronizing and blanking signals. 3.2.2.3 Multipulse test signal The multipulse test signal shown in Figure 5 consists of a white flag, a 2T pulse, and modulated pulses. The modulating frequencies of the pulses correspond to the frequency packets of the mul
29、tiburst portion of the combination test signal (with the exception of 0.5 MHz), superimposed upon standard synchronizing and blanking signals. 3.2.2.4 Field-bar test signal The field-bar test signal shown in Figure 6 consists of a field-rate square wave, extending to the total luminance signal level
30、 (100 IRE units), superimposed upon standard synchronizing and blanking signals. ATIS-0100502.2005 4 3.2.2.5 Flat-field test signal with variable APL The flat-field test signal with variable APL shown in Figure 7 consists of a uniform luminance signal, the average picture level (APL) of which is tra
31、nsitioned between 10% and 90%, and is superimposed upon standard synchronizing and blanking signals. 3.2.3 Method of measurement When conducting in-service vertical interval test signal (VITS) measurements, the composite test signal appearing in the Vertical Interval shall be used.2The flat-field an
32、d field-bar test signals can be used only in out-of-service testing. The maximum range of the composite signal as shown in Figure 3, is from -40 IRE units to + 110 IRE units (peak of subcarrier on modulated steps). It should be noted that except where full field test signals are essential to the mea
33、surement of a particular transmission parameter (for example, field-time waveform distortion), the performance limit specified for each transmission parameter applies equally to both VITS and full-field test signals. Furthermore, the performance values apply irrespective of the APL within the 10% to
34、 90% APL range. This is an important point to remember when making VITS measurements, particularly during program transmission periods in which control cannot be exercised over the APL value of the picture signal. Many of the transmission parameters can be markedly affected by APL variations. Theref
35、ore, sufficient time should be allowed when making VITS measurements to ensure that a good portion of the APL range is explored by the picture signal before recording the test signal measurement. When performing out-of-service testing of a video transmission service channel, the associated audio tra
36、nsmission service channel(s) shall be exercised at peak operating level. Test equipment shall be calibrated in accordance with the manufacturers recommendations and terminated as specified. 3.3 Acronyms 0.10 volt across a standard load (124 ); and 0.05 volt referenced to ground. 4.1.2.4.3 Method of
37、measurement. The non-useful dc component of the picture signal shall be measured by means of a suitable dc instrument with the video signal removed and the transmission service channel input terminals terminated. 4.2 Audio signal electrical interface specifications 4.2.1 Impedance 4.2.1.1 Source imp
38、edance 4.2.1.1.1 Definition. The audio source impedance of a transmission service channel, Zsin Figure 8(b), is the impedance presented to the input terminals of a transmission service channel or other input point by the output terminals of the signal source. Proper source impedance is required for
39、transmission service channel evaluation. 4.2.1.1.2 Standard value. The standard value shall be 600 , balanced to ground, with no dc voltage present and with a return loss of at least 30 dB over the frequency range of 50 Hz-15 kHz. 4.2.1.1.3 Method of measurement. The source impedance shall be measur
40、ed by using impedance measurement equipment and the return loss calculated from the following formula: mmZZZZ+= log20(dB)Loss Return10ATIS-0100502.2005 8 where Z = specified standard impedance Zm= measured impedance Alternately, the return loss may be measured using a return loss bridge. 4.2.1.2 Inp
41、ut Impedance 4.2.1.2.1 Definition. The input impedance of a transmission service channel, ZIin Figure 8(b), is the impedance presented by the input terminals of a transmission service channel or other audio input point. 4.2.1.2.2 Standard value. The standard value shall be 600 , balanced to ground w
42、ith no dc voltage present and with a return loss of at least 30 dB over the frequency range of 50 Hz-15 kHz. 4.2.1.2.3 Method of measurement. See 4.2.1.1.3. 4.2.1.3 Output impedance 4.2.1.3.1 Definition. The output impedance of a transmission service channel, Zoin Figure 8(b), is the impedance prese
43、nted by the output terminals of a transmission service channel or other audio output point. 4.2.1.3.2 Standard value. The standard value shall be 600 , balanced to ground, with no dc voltage present and with a return loss of at least 30 dB over the frequency range of 50 Hz-15 kHz. 4.2.1.3.3 Method o
44、f measurement. See 4.2.1.1.3. 4.2.1.4 Load impedance 4.2.1.4.1 Definition. The load impedance of a transmission service channel, ZLin Figure 8(b), is the impedance presented by the input terminals of the device that will terminate the audio output of the transmission service channel. Proper load imp
45、edance is required for channel evaluation. 4.2.1.4.2 Standard value. The standard value shall be 600 , balanced to ground, with no dc voltage present and with a return loss of at least 30 dB over the frequency range of 50 Hz-15 kHz. 4.2.1.4.3 Method of measurement. See 4.2.1.1.3. 4.2.2 Audio signal
46、4.2.2.1 Input signal level 4.2.2.1.1 Definition. The input signal level of a transmission service channel is that level presented to the transmission service channel input terminals. It is expressed in dBm. 4.2.2.1.2 Standard value. The input peak operating level of the transmission service channel
47、at the standard impedance is equal to the peaks of a sine wave the average power of which is +18 dBm. NOTES: (1) This level applies at a nominal 400 Hz with application time limited to less than 4 seconds. This level must be reduced at higher frequencies to take into account any pre-emphasis. ATIS-0
48、100502.2005 9 (2) The maximum continuous test tone amplitude (averaged over 1 second) that can be applied at the input terminals of a transmission service channel is as follows: +8 dBm for 50 Hz f 404 Hz 0 dBm for 404 Hz f 15 kHz (3) Some transmission service channels may be incompatible with certai
49、n single-frequency testing techniques. (4) Test equipment shall be calibrated according to manufacturers recommendations and terminated as specified. 4.2.2.1.3 Method of measurement. The audio input signal level shall be measured by properly terminated audio test equipment. Sinusoidal waveforms may be measured using a properly calibrated voltage or power meter. 4.2.2.2 Output signal level 4.2.2.2.1 Definition. The output signal level of a transmission service channel is that level presented by the transmission service channel
