technical requirements for immunity of telecommunications
Contents
1. 31 equipment 6 1 Read write and storage of data rrrrrer 31 6 1 1 Particular test conditions rrrrrrres 31 6 1 2 Particular performance criteria 31 6 2 Data display o o o o reeeecreeeee 32 6 2 1 Particular test conditions seeeeseeees 32 6 2 2 Particular performance criteria 32 6 3 Data input gt oo seeeeeeeeres 33 6 3 1 Particular test conditions seeeeeeeeee 33 6 3 2 Particular performance criteria 33 6 4 Data printing reeeeseeeee 33 6 4 1 Particular test conditions r r 33 6 4 2 Particular performance criteria 8 33 6 5 Data processing sseseeeeres 34 6 5 1 Particular test conditions rrrrrre 34 6 5 2 Particular performance criteria 34 7 Performance criteria for local area networks LAN tetetete 35 7 1 Particular test conditions j seeeeeeeeee 35 7 2 Particular performance criteria ttt 35 8 Performance criteria for printers seseeeeeeee 36 8 1 Particular test conditions seeeeeeeseee 36 8 2 Particular performance criteria ttt 36 Nippon Telegraph and Telephone Corp 1 General The immunity test requirements for equipment are given on a port by port basis Tests shall be conducted in a well defined and reproducible manner The tests shall be carried out as single tests in sequence The sequence of testing is optional2. Tests shall be performed at a maximum repetition rate of one discharge per second b air discharge at slots and apertures and insulating surface On these parts of the EUT where it is not possible to perform contact discharge testing the equipment should be investigated to identify user accessible points where breakdown may occur examples are openings at edges of keys or in the covers of keyboard and telephone handsets Such points are tested using the air discharge method See also JIS C 1000 4 2 regarding painted surfaces This 17 Nippon Telegraph and Telephone Corp investigation should be restricted to those areas normally handled by the user A minimum of 10 single air discharges shall be applied to the selected test point for each such area The application of electrostatic discharges to the contacts of open connectors is not required by this TR NOTE The necessity of charge reduction is under study in international conferences The following information is useful Charge reduction should be performed at each discharge when ground less equipment which has a plug without a ground electrode or equipment driven by DC power etc is tested by the contact discharge Ground less equipment should be supplied with power via an isolated transformer 2 2 Electrical fast transients EFT The test method is given in JIS C 1000 4 4 However the test setup for in situ measurements is not applicable for ITE The test procedure
3. by causing circuit breakers fuses or other such 14 Nippon Telegraph and Telephone Corp devices to operate 8 For equipment with a low priority of service it is acceptable to use the following performance criteria during the test Loss of function is allowed the function can be restored by a manual operation of the user in accordance with the manufacturer s instructions Functions and information protected by a battery backup shall not be lost 9 This test is applicable only in equipments in which the battery back up is not permanently connected to the DC distribution system 4 1 5 AC power ports Immunity requirements for AC power ports of telecom center equipment are specified in table 9 Table 9 Immunity requirements for AC power ports of telecom center equipment Environmental eee i Performance Test specification Units Test method EN Remarks phenomenon criterion 9 1 Radio frequency 1 Vemf See clause 6 1 and A 0 15 80 MHz Continuous conducted See 1 section 6 2 5 in See 2 and 3 TTC JT K43 9 2 Surge 0 5 line to line kV See clause 6 1 and B 1 2 50 8 20 1 line to ground section 6 2 3 in LS TTC JT K43 See 4 9 3 Fast transients 0 25 kV See clause 6 1 and B section 6 2 2 in TTC JT K43 9 4 Voltage dips gt 95 reduction See clause 6 1 and B 0 5 period section 6 2 6 in 30 reduction TTC JT K43 C 23 period 9 5 Voltage interruption
4. ESD The test requirements are specified for each port considered NOTES 1 Safety considerations are not covered in this TR 2 In special cases situations will arise where the level of disturbance may exceed the levels specified in this TR for example where a hand held transmitter is used in proximity to equipment In these instances special mitigating measures may have to be employed 1 2 Outline Section 2 describes key terms used in this document laws and regulations referred to in this document and some notices that are relevant when this document is used Section 3 describes requirements related to levels and methods for testing immunity to electromagnetic disturbances for customer premises equipment and telecom center equipment A normative annex describes immunity test methods for customer premises equipment more in detail 1 Nippon Telegraph and Telephone Corp 2 References and terminology 2 1 References The following documents contain provisions which through reference in this text constitute provisions of this TR For dated references subsequent amendments to or revisions of any of these publications do not apply However parties to agreements based on this TR are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below For undated references the latest editions of the publications referred to apply Members of ISO and IEC maintain registers
5. The description of the test the test generator the test methods and the test set up are given in JIS and IEC basic EMC standards which are referred to in previous tables 1 to 4 in clause 3 1 and tables 5 to 9 in clause 4 1 The contents of these JIS and IEC basic EMC standards are not repeated here however modifications or additional information needed for the practical application of the tests are given in this TR 2 Particular requirements 2 1 Electrostatic discharge ESD Static electricity discharges shall be applied only to those points and surfaces of the EUT which are expected to be touched during usual operation including user access as specified in the user manual for example for ribbon and paper roll changes The discharges shall be applied in two ways a contact discharges to the conductive surfaces and to coupling planes The EUT shall be exposed to at least 200 discharges 100 each at negative and positive polarity at a minimum of four test points a minimum of 50 discharges at each point One of the test points shall be subjected to at least 50 indirect discharges contact to the center of the front edge of the horizontal coupling plane The remaining three test points shall each receive at least 50 direct contact discharges If no direct contact test points are available then at least 200 indirect discharges shall be applied in the indirect mode see JIS C 1000 4 2 for use of the Vertical Conducting Plane VCP
6. during testing 2 Above 10 MHz the lower test level can be applied The specific level is under study 3 The test level can be defined as equivalent current into 150 Q 4 This test can be applied when appropriate CDN cable exists 13 Nippon Telegraph and Telephone Corp 4 1 4 DC power ports Immunity requirements for DC power ports are specified in table 8 Table 8 Immunity requirements for DC power ports of telecom center equipment Environmental Test r Performance sh 26 Units Test method H Remarks phenomenon specification criterion 8 1 Radio frequency 1 Vemf See clause 7 1 A 0 15 80 MHz continuous See 1 and section 7 2 5 See 2 and 3 conducted in TTC JT K43 8 2 Fast transients 0 25 kV See clause 7 1 B and section 7 2 2 in TTC JT K43 8 3 Voltage dips 0 of nominal A See 9 High impedance output voltages impedance of test generator 0 004 s 0 of nominal C See 5 6 and 9 voltages 0 01 and 0 1 s 0 of nominal A See 9 Low impedance output voltages impedance of test generator 0 004 s 0 of nominal See clause 7 1 C See 5 6 and 9 voltages and section 7 2 6 0 01 and 0 1 s in TTC JT K43 8 4 Abnormal 0 to 90 of nominal C See 7 8 and 9 voltage voltages 1 s 110 to 125 of nominal C See 7 8 and 9 voltages 1 s 8 5 Voltage variation From 100 to of nominal A The test simulates a charge in the DC 90 voltages voltage is not a hole but a change fro
7. interface the following also applies 24 Nippon Telegraph and Telephone Corp A sinusoidal signal of 1 kHz 40 dBm is impressed on the telecommunication line signal level without the carrier wave The resulting acoustic sound pressure level is measured using a microphone The measured level shall be recorded as the reference level and used The signal used to establish the reference level is switched off during the actual test The measurement bandwidth shall be 100 Hz maximum The background noise shall not exceed a level 15 dB below the reference level The demodulated differential mode noise in the receive direction measured in the way described for the reference level shall not be greater than the values given in table 5 2 NOTE The signal demodulated inside the EUT caused by the disturbance applied during the immunity testing and affects associated equipment connected to the EUT are not considered Table 5 2 Maximum acoustic demodulated levels at the telecommunications port measurement method 2 Ae ae Type of immunity test Demodulated differential mode noise dBm 0 15 to 10 Conducted Reference level 10 dB 10 to 30 Conducted Reference level 10 dB to 10 dB except 26 95 to 27 29 See 2 26 95 to 27 29 Conducted Reference level 30 to 80 Conducted Reference level 20 dB 80 to 1000 except at 900 See Radiated Reference level 10 dB 1 900 See 1 Radiated Reference level 10 dB 1 This requirement is
8. may be determined from consideration of the electrical characteristics and usage of particular equipment that some of the tests are inappropriate and therefore unnecessary In such a case it is required that both the decision and the justification not to apply any particular test to any particular port be recorded in the test report 4 1 1 Enclosure port Immunity requirements for an enclosure port are specified in table 5 Table 5 Immunity requirements for an enclosure port of telecom center equipment Environmental Performance pheiomengn Test levels Units Test method pate Remarks 5 1 Radio frequency 1 See clause 7 1 and section 80 800 MHz electromagnetic field 7 2 4 in TTC JT K43 See 1 10 V m A 800 960 MHz 1 960 1000 MHz 10 1400 2000 MHz 5 2 Electrostatic 4 contact discharge kV See clause 7 1 and section B Contact discharge discharge air discharge 7 2 1 in TTC JT K43 and air discharge 1 The test may be performed with a start frequency lower than 80 MHz but no less than 27 MHz 12 Nippon Telegraph and Telephone Corp 4 1 2 Outdoor telecommunication ports Immunity requirements for outdoor telecommunication ports are specified in table 6 Table 6 Immunity requirements for outdoor telecommunication ports of telecom center equipment Environmental pnt ns A Performance Test specification Units Test method KON Remarks phenomenon crite
9. not applicable for countries where no digital mobile services operating at 900 MHz exist See note to table 5 1 2 The limits change linearly with the logarithm of the frequency b Selected frequency test The following shall be fulfilled at the spot frequencies specified in tables 1 2 3 and 4 this may be shown by checking the data sent to the line to avoid having an operator in the field the TTE shall be able to establish a call with telephony service the TTE shall be able to receive a call the TTE shall be able to clear a call where the TTE is intended to provide a data non telephony services the time required for a transmission shall not as a consequence of the application of the test increase beyond that defined by the manufacturer 25 Nippon Telegraph and Telephone Corp Performance criterion B The following shall be fulfilled A call established prior to the application of the disturbance shall be maintained Requirements to be checked after the application of the disturbance the TTE shall be able to establish a call the TTE shall be able to receive a call the TTE shall be able to clear a call Performance criterion C Requirements to be checked after the application of the disturbance the TTE shall be able to establish a call the TTE shall be able to receive a call the TTE shall be able to clear a call 5 2 Telecommunications terminal equipment TTE having a digital interface 5 2 1
10. of currently valid International Standards Japan Industrial Standards JIS except ones under consideration take precedence over IEC standards when both JIS and IEC standards for the same topic are listed below 1 JIS C 0161 1997 International Electrotechnical Vocabulary IEV Chapter 161 Electromagnetic compatibility 2 IEC 60050 161 1990 International Electrotechnical Vocabulary IEV Chapter 161 Electromagnetic compatibility 3 IEC 60318 1970 An artificial ear of the wideband type for the calibration of earphones used in audiometry 4 JIS C 1000 4 2 1999 Electromagnetic compatibility EMC Part 4 Testing and measurement techniques Section 2 Electrostatic discharge immunity test Basic EMC publication in Japanese 5 IEC 61000 4 2 1995 Electromagnetic compatibility EMC Part 4 Testing and measurement techniques Section 2 Electrostatic discharge immunity test Basic EMC publication 6 JIS C 1000 4 3 1997 Electromagnetic compatibility EMC Part 4 Testing and measurement techniques Section 3 Radiated radio frequency electromagnetic field immunity test Basic EMC publication in Japanese 7 IEC 61000 4 3 1995 Electromagnetic compatibility EMC Part 4 Testing and measurement techniques Section 3 Radiated radio frequency electromagnetic field immunity test Basic EMC publication 8 JIS C 1000 4 4 1999 Electromagnetic compatibility EMC Part 4 Testing and measurement techniques
11. specified test level In cases of dispute full illumination of the EUT will take precedence 2 3 2 Continuous conducted disturbances There shall be no additional deviations from JIS C 1000 4 6 2 4 Power frequency magnetic field The test procedure shall be in accordance with IEC 61000 4 8 The EUT shall be arranged and connected to satisfy its functional requirements and shall be placed at the center of the coil system immersion method The cables supplied by the equipment manufacture shall be used or in their 19 Nippon Telegraph and Telephone Corp absence suitable alternative cables of the type appropriate to the signals involved shall be used Physically large products need not be completely submerged in the magnetic field only the sensitive devices such as CRT monitors if they are the only sensitive parts In this case and if the CRT monitor is integral with the ITE then the CRT monitor or sensitive device can be removed for testing 2 5 Surges The test procedure shall be in accordance with JIS C 1000 4 5 or if appropriate ITU T K20 K21 or K22 2 6 Voltage dips and interruptions The test procedure is in accordance with IEC 61000 4 11 There shall be no deviations from that standard 3 Conditions during testing 3 1 General conditions The tests shall be made exercising all primary functions in the most representative mode consistent with typical applications The test sample shall be configured in a manner
12. the demodulated differential mode noise and acoustic sound pressure levels in the receive direction shall not be greater than the values given in table 5 3 NOTE This noise means the signal demodulated inside the EUT caused by the disturbance applied during the immunity testing and influences associated equipment connected to the EUT for TTE having an acoustic interface the following also applies the acoustic demodulated sound pressure level spl in the receive direction shall not be greater than the values given in table 5 3 Table 5 3 Maximum demodulated differential mode noise and acoustic sound pressure levels at the telecommunications port and at the acoustic receiving device measurement method 1 Demodulated differential Acoustic sound Frequency band MHz Type of immunity test mode noise pressure level dBm0 dB spl 0 15 to 10 Conducted 50 55 10 to 30 Conducted 50 to 30 55 to 75 except 26 95 to 27 29 See 2 See 2 26 95 to 27 29 Conducted 40 65 30 to 80 Conducted 20 85 80 to 1000 Radiated 30 75 except at 900 See 1 900 See 1 Radiated 50 55 1 This requirement is not applicable for countries where no digital mobile services operating at 900 MHz exist See note to table 5 1 2 The limits change linearly with the logarithm of the frequency NOTE The meaning of dBm0 is described in clause 3 4 of ITU T recommendation O 101 Measurement method 2
13. the test the EUT shall operate without error rate beyond the figure defined by the manufacturer requests for retry beyond the figure defined by the manufacturer speed of data transmission rate beyond the figure defined by the manufacturer protocol error loss of link Performance criterion B Error rate request for retry and speed of data transmission rate may be degraded during the application of the test Degradation of the performance as described in criteria A is permitted provided that the normal operation of the EUT is self recoverable to the condition immediately before the application of the test In these cases operator response is permitted to re initiate an operation Performance criterion C Degradation of the performance as described in criteria A and B is permitted provided that the normal operation of the EUT is self recoverable to the condition immediately before the application of the test or can be restored after the test by the operator 35 Nippon Telegraph and Telephone Corp 8 Performance criteria for printers 8 1 Particular test conditions Data shall be printed with printers or plotters No standard image is required but the use of a text containing more than three character fonts and at least one grid of lines is recommended Character pitch and line spacing should be small If the dot density can be selected the highest density shall be chosen Tests shall be carried out with the EUT in th
14. 95 reduction See clause 6 1 and C 250 period section 6 2 6 in TTC JT K43 1 Test level is specified by unmodulated level but 80 AM 1 kHz is needed during testing 2 Above 10 MHz the lower test level can be applied The specific level is under study 3 The test level can be defined as equivalent current into 150 Q 4 This test can be applied when appropriate CDN exists 4 2 Test method and facility The test method and facility may be in accordance with the specifications of any of the related standards listed below besides those specified in tables 5 to 9 But the immunity requirements specified in tables 5 to 9 should be satisfied 1 CISPR publ 24 2 ITU T K 43 3 EN55024 4 ETS 300 386 1 5 TTC JT K43 6 ARIB STD T57 15 Nippon Telegraph and Telephone Corp 7 ITU T K 48 8 TTC JT K48 NOTE Report from Telecommunications Technology Council and some standards authorized by industry associations such as the Communication Industry Association exist besides those listed in clause 2 1 Report from Telecommunication Technology Council 1998 Partial Reply to Inquiry No 3 About Various Standards of International Special Committee on Radio Interference CISPR Limits and Measurement Methods of Immunity of ITE 16 Nippon Telegraph and Telephone Corp Normative annex Immunity test method for customer premises equipment Contents 1 General fe eeeeeeees 2 Particula
15. E shall be able to receive a call the TTE shall be able to clear a call where the TTE is intended to provide a data non voice service the time required for a transmission shall not as a consequence of the application of the test increase beyond that defined by the manufacturer For ISDN equipment for primary access only the following also applies The number of loss of frame alignments shall be less than 10 within a test period of 10 seconds Where it can be clearly established that a voice call is maintained throughout the test it is not then required to evaluate the loss of frame alignment Performance criterion B The following shall be fulfilled A call established prior to the application of the phenomena shall be maintained Requirements to be checked after the application of the phenomena the TTE shall be able to establish a call the TTE shall be able to receive a call the TTE shall be able to clear a call 29 Nippon Telegraph and Telephone Corp Performance criterion C Requirements to be checked after the application of the phenomena the TTE shall be able to establish a call the TTE shall be able to receive a call the TTE shall be able to clear a call 5 3 Facsimile 5 3 1 Particular test conditions The EUT shall be connected to a second EUT or simulator which permits a test pattern to be sent to and be received from the EUT A test pattern selected from the relevant ITU T recommendation is preferr
16. Particular test conditions The TTE shall be configured for connection to a telecommunication line or reference line at its nominal impedance Auxiliary equipment may be used to simulate the telecommunications network For digital basic access ISDN interfaces providing telephony service to the TTE shall be in idle mode as defined for the applied digital to analog conversion 5 2 2 Particular performance criteria The following performance criteria are applicable only when the functions are implemented Performance criterion A a Swept frequency test Testing shall be carried out in accordance with one of the two measurement methods described below In case of dispute tests shall be carried out as originally performed measured method 1 Measured method 1 The volume control where it exists shall be set as close as possible to the position which gives the nominal value as stated by the manufacturer The acoustic sound pressure level spl shall be measured using a calibrated artificial 26 Nippon Telegraph and Telephone Corp ear as defined in IEC 60318 coupled without loss to the acoustic receiving device of the TTE The background acoustic noise shall be less than 40 dB spl The audio channel shall be open and active The following shall be fulfilled during a sweep in the whole specified frequency range the TTE shall be able to maintain an established call for TTE supporting telephony service the following also applies
17. Section 4 Electrical fast transient burst immunity test Basic EMC publication in Japanese 9 IEC 61000 4 4 1995 Electromagnetic compatibility EMC Part 4 Testing and 2 Nippon Telegraph and Telephone Corp measurement techniques Section 4 Electrical fast transient burst immunity test Basic EMC publication 10 JIS C 1000 4 5 1999 Electromagnetic compatibility EMC Part 4 Testing and measurement techniques Section 5 Surge immunity test Basic EMC publication in Japanese 11 IEC 61000 4 5 1995 Electromagnetic compatibility EMC Part 4 Testing and measurement techniques Section 5 Surge immunity test Basic EMC publication 12 JIS C 1000 4 6 1999 Electromagnetic compatibility EMC Part 4 Testing and measurement techniques Section 6 Immunity to conducted disturbances induced by radio frequency fields in Japanese 13 IEC 61000 4 6 1996 Electromagnetic compatibility EMC Part 4 Testing and measurement techniques Section 6 Immunity to conducted disturbances induced by radio frequency fields 14 IEC 61000 4 8 1993 Electromagnetic compatibility EMC Part 4 Testing and measurement techniques Section 8 Power frequency magnetic field immunity test 15 IEC 61000 4 11 1994 Electromagnetic compatibility EMC Part 4 Testing and measurement techniques Section 11 Voltage dips short interruptions and voltage variations immunity test 16 CISPR Publ 22 1997 Information technology equipment Radi
18. TECHNICAL REQUIREMENTS FOR IMMUNITY OF TELECOMMUNICATIONS EQUIPMENT TR NO 549001 Edition 3 1 Ist April 2015 Nippon Telegraph and Telephone Corporation NOTICE This document provides a summary of the basic technical requirements for the test level test procedures etc for the minimum immunity to electromagnetic disturbances of telecommunications equipment used and provided by Nippon Telegraph and Telephone Corporation NTT For exceptional environmental conditions special mitigating measures may be required This document is intended as reference material to be used by telecommunications equipment designers and manufactures The contents of this document may be changed without notice when related standards are revised new technology is introduced to the equipment or equipment requirements are modified If you have any questions about the contents of this document please contact the following sections NTT Network Technology Laboratories Environmental Technology and Management Project EMC Technology Group TEL 8 1 422 59 7655 FAX 81 422 59 5681 E mail emc spec lab ntt co jp 2015 NTT This document may not be copied or reproduced in any form without written permission from NTT Contents 1 Overview 1 1 Purpose 1 2 Outline 2 References and terminology 2 1 References 2 2 Terminology 3 Requirements for customer premises equipment 3 1 Applicability 3 1 1 Enclosure port 3 1 2 Signal ports and telecommunic
19. The volume control where it exists shall be set at a fixed level during calibration and shall not be changed during the test The following shall be fulfilled during a sweep in the whole specified frequency range 27 Nippon Telegraph and Telephone Corp the TTE shall be able to maintain an establish call for TTE supporting telephony service the following also applies with the audio channel open and active the demodulated differential mode noise and acoustic sound pressure level from the EUT measured in the assigned B channel shall not be greater than the values given in table 5 3 The measurement bandwidth shall be 100 Hz maximum at 1 kHz for TTE having an acoustic interface the following also applies An A law or a u law 1 coded digital signal representing a sinusoidal signal of 1 kHz 40 dBm0 is impressed on the telecommunication line signal level without the radio frequency disturbance The resulting acoustic sound pressure level is measured using a microphone The measured level shall be recorded as the reference level and used The signal used to establish the reference level is switched off during the actual test The measurement bandwidth shall be 100 Hz maximum During the test the idle code shall be sent to the EUT in the assigned B channel The background noise shall not exceed a level 15 dB below the reference level The demodulated differential mode noise 2 in the receive direction measured in the
20. V charge voltage in normative annex 1 See clause 6 2 in normative annex 2 Applicable only to equipment containing devices susceptible to magnetic fields such as CRT monitors Hall elements electrodynamic microphones magnetic field sensors etc 3 The frequency range is scanned as specified However when specified in Annex A of normative Annex an additional comprehensive functional test shall be carried out at a limited number of frequencies The selected frequencies are 80 120 160 230 434 460 600 863 and 900 MHz 1 4 The test may be performed with a start frequency lower than 80 MHz but no less than 26 MHz 8 Nippon Telegraph and Telephone Corp 3 1 2 Signal ports and telecommunication ports Immunity requirements for signal and telecommunication ports are specified in table 2 Table 2 Immunity requirements for signal and telecommunication ports of customer premises equipment 2 3 4 5 6 7 Environmental Test Performance phenomenon specification oe Test method criterion Remarts 2 1 Radio frequency 0 15 80 MHz See clause 2 3 in A See 1 continuous 3 V unmodulated rms normative annex 3 4 and conducted 6 2 2 Surge 10 700 Tr Th us See clause 2 5 in See ITU T See 2 5 1 5 kV peak normative annex Rec K series and 7 4 kV peak 2 3 Fast transients 0 5 kV peak See clause 2 2 in B See 3 5 50 Tr Th ns normative a
21. age waveform 3 If the radiated test has been carried out from a frequency lower than 80 MHz then the test range shall only extend up to this frequency 4 When the manufacture specifies protection measures and it is impractical to simulate these measures during the tests then the applied test levels shall be reduced to 0 5 kV and 1 kV 3 2 Test method and facility The test method and facility may be in accordance with the specifications of any of the related standards listed below besides those specified in tables 1 to 4 But the immunity requirements specified in tables 1 to 4 should be satisfied 1 CISPR publ 24 2 ITU T K 43 3 EN55024 4 ETS 300 386 1 5 TTC JT K43 6 ARIB STD T57 7 ITU T K 48 8 TTC JT K48 11 Nippon Telegraph and Telephone Corp NOTE Report from Telecommunications Technology Council and some standards authorized by industry associations such as the Communications Industry Association of Japan exist besides those listed in clause 2 1 Report from Telecommunication Technology Council 1998 Partial Reply to Inquiry No 3 About Various Standards of International Special Committee on Radio Interference CISPR Limits and Measurement Methods of Immunity of ITE 4 Requirements for telecom center equipment 4 1 Applicability Tests shall be applied to the relevant ports of the equipment according to tables 5 to 9 Tests shall only be carried out if the relevant port exists It
22. arth 9 Nippon Telegraph and Telephone Corp 3 1 3 DC power port Immunity requirements for an input DC power port are specified in table 3 Equipment marketed with an AC DC converter is excluded If DC power is fed on conductors included in a signal cable then the requirements of table 2 apply only to this cable Table 3 Immunity requirements for input DC power port of customer premises equipment Environmental Test Performance phenomenon specification yaus fo criterion Remarks 3 1 Radio frequency 0 15 80 MHz See clause 2 3 in A See 1 and 3 continuous 3 V unmodulated rms normative annex conducted 80 AM 1 kHz 3 2 Surge 1 2 50 80 20 Tr Th us See clause 2 5 in B Test applies 0 5 kV peak normative annex lines to earth ground See 2 3 3 Fast transients 0 5 kV peak See clause 2 2 in B 5 50 Tr Th ns normative annex 5 Repetition frequency kHz 1 The frequency range is scanned as specified However when specified in clause 5 of normative annex an additional comprehensive functional test shall be carried out at a limited number of frequencies The selected frequencies for conducted test are 0 2 1 7 1 13 56 21 27 12 and 40 68 MHz 1 2 Applicable only to ports which according to the manufacturer s specification may connect directly to outdoor cables 3 Ifthe radiated test has been carried out from a frequency lower than 80 MHz then the test range shall only extend
23. ation ports 3 1 3 DC power port 3 1 4 AC power port 3 2 Test method and facility 4 Requirements for telecom center equipment 4 1 Applicability 4 1 1 Enclosure port 4 1 2 Outdoor telecommunication ports 4 1 3 Indoor telecommunication ports 4 1 4 DC power ports 4 1 5 AC power ports 4 2 Test method and facility Normative annex 1 Nippon Telegraph and Telephone Corp 1 Overview 1 1 Purpose To ensure that telecommunication services provided by NTT keep the specified quality and reliability this Technical Requirement TR prescribes the limits of testing immunity to electromagnetic disturbances for telecommunications equipment containing digital circuits microprocessors or switching power supplies information technology equipment used on customer premises and radio communication equipment defined in ARIB standard T57 The object of this TR is to establish requirements that will provide an adequate level of intrinsic immunity so that the equipment will operate as intended in its environment For exceptional environmental conditions special mitigating measures may be required Owing to testing and performance assessment considerations some tests are specified in defined frequency bands or at selected frequencies The object of this TR is to define the immunity test requirements for equipment defined in the scope in relation to continuous and transient and conducted and radiated disturbances including electrostatic discharges
24. be interrupted or modulated to convey information 2 degradation The unwanted change in operational performance of EUT due to electromagnetic disturbances This does not necessarily mean malfunction or 4 Nippon Telegraph and Telephone Corp catastrophic failure 3 equipment under test EUT A representative ITE or functionally interactive group of ITE that is a system which includes one or more host units and is used for evaluation purposes 4 information technology equipment ITE The definition of ITE is as described in Report from Telecommunication Technology Council 1997 Partial Reply to Inquiry No 3 About Various Standards of International Special Committee on Radio Interference CISPR Limits and Measurement Methods of Radio Disturbance Characteristics of ITE 5 jitter of a cathode ray tube CRT monitor Peak to peak variation in the geometric location of picture elements on the viewing surface of the CRT monitor 6 temporal instability flicker The perception of unintended temporal variation in luminance 7 port Particular interface of the specified equipment with the external electromagnetic environment see figure 1 Enclosure port Earth port DC power port P Information technology Signal port AC power port equipment aaa Telecommunication Figure 1 Description of ports 8 enclosure port The physical boundary of the equipment through which electromagnetic fields may radiate o
25. consistent with typical installation practice If the equipment is part of a system or can be connected to auxiliary equipment then the equipment shall be tested while connected to the minimum representative configuration of auxiliary equipment necessary to exercise the ports in a similar manner to that described in the Report from Telecommunication Technology Council 2000 Partial Reply to Inquiry No 3 About Various Standards of International Special Committee on Radio Interference CISPR Limits and measurement method of disturbances emitted from ITE The configuration and mode of operating during the tests shall be precisely noted in the test report It is not always possible to test every function of the apparatus in such cases the most critical mode of operation shall be selected If the equipment either has a large number of terminals or a large number of ports with similar connections then a sufficient number shall be selected to simulate the actual operating conditions and to ensure that all the different types of termination are covered Coil cables such as keyboard cables shall not be intentionally stretched during testing For such cables the length specified in the table notes refers to unstretched 20 Nippon Telegraph and Telephone Corp conditions The test equipment or auxiliary equipment for example NT or simulator connected to the EUT shall not have any influence on the result of the testing In cases wh
26. d to normal operation by reset or reboot are permissible Failures resulting in a system abort which can be recovered to normal operation by reset or reboot are permissible 31 Nippon Telegraph and Telephone Corp 6 2 Data display 6 2 1 Particular test conditions Text or graphics shall be displayed on display devices such as CRT monitors and liquid crystal plasma or LED displays 6 2 2 Particular performance criteria Performance criterion A When seen from the normal viewing distance the EUT shall operate with no change beyond the manufacturer s specification in flicker color focus and jitter except for the power frequency magnetic field test Power frequency magnetic field test For CRT monitors the following also applies The jitter shall be measured using a measuring microscope as specified in 6 6 14 of JIS Z 8513 The jitter in mm shall not exceed the following value when the CRT monitor is immersed in a continuous magnetic field of 1 A m r m s at one of the power frequencies 50 or 60 Hz character height in mm 0 3 X 2 5 33 3 Alternatively a field of 50 A m may be applied and a transparent graduated mask used to assess the jitter In that case the jitter shall not exceed 50 times the value in the above formula NOTE This test level is used to simplify the measurement of jitter Lesser values of the test level may be used if non linearity is experienced due to for example saturation of screening material T
27. e printing mode 8 2 Particular performance criteria Performance criterion A The EUT shall operate without degradation of performance during and after the application of the disturbance For example there shall be no loss or corruption of data during input output operations degradation of the printed image beyond the manufacturer s specification change in output mode or character font perceptible change in dot pitch unintended line or page feed Performance criterion B As for performance criterion A with the following exceptions degradation of the printed image beyond the manufacturer s specification is allowed misalignment of the grid lines is allowed unintended line feed is allowed After the disturbance is removed normal operation of the EUT is self recoverable to the condition immediately before the application of the test this may involve an operator response to re initiate the operation Performance criterion C Degradation of the performance as described in criteria A and B is permitted provided that the normal operation of the EUT is self recoverable to the condition immediately before the application of the test or can be restored after the test by the operator 36 Nippon Telegraph and Telephone Corp
28. ed but is not mandatory The following requirements are in addition to the TTE performance requirements 5 3 2 Particular performance criteria Performance criterion A The EUT shall operate normally during and after the test without data transfer errors for example no retries beyond the specified maximum degradation of the printed image beyond the manufacturer s specification color change beyond the manufacturer s specification re initiating a call Performance criterion B As for performance criteria A with the following exceptions which are permitted during the application of the disturbance provided that normal operation of the EUT is recoverable to the condition immediately before the application of the disturbance degradation of the printed image beyond the manufacturer s specification Performance criterion C Any degradation of performance is permitted provided that normal operation is self recoverable or can be restored after the test by the use of operator controls and provided that any interruptions in the transmission are logged and the user notified the EUT can re establish a call the EUT can receive a call the EUT can clear a call 30 Nippon Telegraph and Telephone Corp 6 Performance criteria for data processing equipment The test shall be carried out using an exercising program which can repeat the sequences for functions of equipment and in case of failure enable an operat
29. er premises equipment 3 1 Applicability Tests shall be applied to the relevant ports of the equipment according to tables 1 to 4 Tests shall only be carried out if the relevant port exists It may be determined from consideration of the electrical characteristics and usage of particular equipment that some of the tests are inappropriate and therefore unnecessary In such a case it is required that both the decision and the justification not to apply any particular test to any particular port be recorded in the test report 3 1 1 Enclosure port Immunity requirements for an enclosure port are specified in table 1 Table 1 Immunity requirements for an enclosure port of customer premises equipment Environmental eae Performance Test specification Units Test method Aas Remarks phenomenon criterion 1 1 Power frequency 50 or 60 Hz See clause 2 4 A See 2 magnetic field 1 A m in normative See 1 annex 1 2 Radio frequency lt 80 800 MHz electromagnetic field 3 V m unmodulated rms Amplitude modulation 80 AM 1 kHz 800 960 MHz See clause 2 3 A The test level 10 V m unmodulated rms in normative specified is 80 AM 1 kHz annex prior to 960 1000 MHz modulation 3 V m unmodulated rms See 3 and 4 80 AM 1 kHz 1400 2000 MHz 10 V m unmodulated rms 80 AM 1 kHz 1 3 Electrostatic discharge 4 contact discharge kV charge voltage See clause 2 1 B 8 air discharge k
30. ere manufacture s specification requires external protection devices or measures which are clearly specified in the user s manual then the test requirements of this standard shall be applied with the external protection devices or measures in place During testing the environmental conditions and supply voltages shall remain within the operating ranges specified for the product unless otherwise indicate in the basic standard If an earth connection independent of the power supply cable is provided this earth connection shall be installed according to the specifications of the manufacturer for the tests given in tables to 4 in clause 3 1 at all other ports 3 2 Particular conditions EUT operational modes etc The particular conditions specified in the annex take precedence over the corresponding parts of the general conditions Where particular conditions for specific functions are not given in this standard then the general conditions shall apply 4 Performance criteria The manufacturer has the obligation to express the performance criteria in terms which relate to the performance of his specific product when used as intended The following performance criteria are applicable and shall only be evaluated when the functions referred to are implemented 4 1 General performance criteria Examples of functions defined by the manufacturer to be evaluated during testing include but are not limited to the following essent
31. erion A a Swept frequency test Testing shall be carried out in accordance with one of the two measurement methods described below In case of dispute tests shall be carried out as originally performed measurement method 1 Measurement method 1 The volume control where it exists shall be set as close as possible to the position which gives the nominal value as stated by the manufacturer The acoustic sound pressure level spl shall be measured using a calibrated artificial ear as defined in IEC 60318 coupled without loss to the acoustic receiving device of the TTE The background acoustic noise shall be less than 40 dB spl The audio channel shall be open and active The following shall be fulfilled during a sweep in the whole specified frequency range the TTE shall be able to maintain an established call for TTE supporting telephony service the following also applies the demodulated narrow band 1 kHz maximum measurement bandwidth of 100 Hz differential mode signal measured on the telecommunications port shall not be greater than the values given in table 5 1 measured at the TTE nominal impedance as specified by the manufacturer NOTE The signal demodulated inside the EUT caused by the disturbance applied during the immunity testing and affects associated equipment connected to the EUT are not considered 23 Nippon Telegraph and Telephone Corp for TTE having an acoustic interface the following also applies the ac
32. gnal the demodulated level will change by 2 dB Therefore if a radiated immunity test subjecting the EUT to a test field carrier level of 3 V m produces a resultant demodulated acoustic 1 kHz disturbance output of 55 dB spl a distinctly annoying acoustic level for most listeners with normal hearing but conveniently above the allowed background noise level of 40 dB spl the test ensures that an amplitude modulated disturbance field of 1 V m approximately 10 dB lower field strength applied to the same equipment in a real world situation can produce a demodulated acoustic disturbance level of approximately 35 dB spl which most people in a practical listening environment do not perceive as annoying 2 The limits change linearly with the logarithm of the frequency Measurement method 2 The volume control where it exists shall be set at a fixed level during calibration and shall not be changed during the test The following shall be fulfilled during a sweep in the whole of the specified frequency range the TTE shall be able to maintain an established call for TTE supporting telephony service the following also applies with the audio channel open and active the demodulated differential mode noise on the telecommunications port measured at the TTE nominal impedance as specified by the manufacturer shall not be greater than the values given in table 5 1 The measurement bandwidth shall be 100 Hz maximum for TTE having an acoustic
33. h do not influence the specified operation within the product specification and which do not prevent automatic recovery are permissible Performance criterion B Failures which are recovered automatically but cause temporary delay in processing are permissible Performance criterion C Failures resulting in a delay in processing after the external disturbance is removed but which can be recovered to normal operation by reset or reboot are permissible Failures resulting in a system abort which can be recovered to normal operation by reset or reboot are permissible Failures which are followed by alarms and can be recovered to normal operation by the operator s intervention are permissible 34 Nippon Telegraph and Telephone Corp 7 Performance criteria for local area networks LAN 7 1 Particular test conditions A minimum test configuration consists of two pieces of terminal equipment interconnected with manufacture specified physical cable Associated equipment necessary to the function of the LAN shall be included in the test configuration Unused ports shall be treated according to the manufacture s instructions The system shall be capable of delivering and receiving data at the specified nominal transmission rate The LAN equipment executes a program which exercise the LAN functions As a minimum the functions below shall be assessed 7 2 Particular performance criteria Performance criterion A During and after
34. he EUT shall be tested in two positions both perpendicular to the magnetic field Performance criterion B Screen disturbances during the application of the test are permissible Performance criterion C Failures which are not self covered after removal of the external disturbance but which can be recovered to normal operation by reset or reboot are permissible 32 Nippon Telegraph and Telephone Corp 6 3 Data input 6 3 1 Particular test conditions Data shall be acquired with input devices such as keyboard mouse magnetic card reader optical character reader image scanner input pen or miscellaneous sensors Though continuous input is preferable testing in the stand by condition is permitted for equipment which requires operator s attendance for operation When the EUT is a mass data input device such as a character reader or scanner then the central processing unit shall run a program which reads an appropriate test chart continuously for the duration of the test Read data inputs are displayed printed directly or stored for later evaluation 6 3 2 Particular performance criteria Performance criterion A Unintended input from input device is not allowed Input devices shall maintain the specified quality image data Performance criterion B Keyboard mouse lock up is not allowed For equipment with manually inputted data which can be confirmed by reading the display errors which can be recognized by the operat
35. ial operation modes and states tests of all peripheral access hard disks floppy disks printers keyboard mouse etc quality of software execution quality of data display and transmission quality of speech transmission Performance criterion A The equipment shall continue to operate as intended without operator intervention 21 Nippon Telegraph and Telephone Corp No degradation of performance or loss of function is allowed below a performance level specified by the manufacturer when the equipment is used as intended The performance level may be replaced by a permissible loss of performance If the minimum performance level or the permissible performance loss is not specified by the manufacturer then either or these may be derived from the product description and documentation and by what the user may reasonably expect from the equipment if used as intended Performance criterion B After the test the equipment shall continue to operate as intended without operator intervention No degradation of performance or loss of function is allowed after the application of the phenomena below a performance level specified by the manufacturer when the equipment is used as intended The performance level may be replaced by a permissible loss of performance During the test degradation of performance is allowed However no change of operating state or stored data is allowed to persist after the test If the minimum performance
36. is as given in JIS C 1000 4 4 together with the following changes and clarifications if the equipment contains identical ports only one shall be tested multiconductor cables such as a 50 pair telecommunication cable shall be tested as a single cable Cables shall not be split or divided into groups of conductors for this test interface ports which are intended by the manufacture to be connected to data cables not longer than 3 m shall not be tested 2 3 Continuous radio frequency disturbances The preferred frequency range for the radiated field test is 80 MHz to 1000 MHz The preferred frequency range for the continuous conducted test is 0 15 MHz to 80 MHz However the radiated test may be performed with a start frequency lower than 80 MHz in that case the continuous conducted test where applicable need only be carried out up to this start frequency The frequency ranges are scanned as specified however at a limited number of selected frequencies a more comprehensive functional test may be required The requirement to undertake this additional selected frequency test is not universally applicable to all products but only to products which have this requirement specified in 18 Nippon Telegraph and Telephone Corp annex A under particular product specific requirements The selected frequencies are given in tables 1 to 4 The dwell time at each frequency shall not be less than the time necessary for the EUT to be exe
37. level or the permissible performance loss is not specified by the manufacturer then either of these may be derived from the product description and documentation and by what the user may reasonably expect from the equipment if used as intended Performance criterion C Loss of function is allowed provided the function is self recoverable or can be restored by the operation of the controls by the manufacturer s instructions Functions and or information stored in non voltage memory or protected by a battery backup shall not be lost 4 2 Particular performance criteria The particular performance criteria which are specified in annex take precedence over the corresponding parts of the general performance criteria Where particular performance criteria for specific functions are not given then the general performance criteria shall apply 22 Nippon Telegraph and Telephone Corp 5 Performance criteria for Telecommunication terminal equipment 5 1 Telecommunications terminal equipment TTE having an analog interface 5 1 1 Particular test conditions The telecommunications terminal equipment TTE shall be configured for connection to a telecommunication line or reference line at its nominal impedance Auxiliary equipment may be used to simulate the telecommunications network 5 1 2 Particular performance criteria The following performance criteria are applicable only when the functions are implemented Performance crit
38. m 2 s the nominal value to a lower value From 100 to of nominal A The test simulates a charge in the DC 90 voltages voltage is not a hole but a change from 2 s the nominal value to a higher value 1 2 3 4 5 6 Test level is specified by unmodulated level but 80 AM 1 kHz is needed during testing Above 10 MHz the lower test level can be applied The specific level is under study The test level can be defined as equivalent current into 150 Q Not assigned In some sensitive equipment momentary and temporary interruption of the service may occur as a result of such transients Lengthening of the interruption to service equipment is not functioning as intended due to the recovery of software shall be taken in account More detailed information about the service interruption shall be provided by the manufacturer on the request of the operator To prevent system malfunctioning additional arrangements concerning the power supply system may be necessary For example dual feeding system high Ohmic distribution system independent power distribution 7 Following the restoration of the supply to the normal voltage range the power conversion and management systems shall automatically restore service The telecommunication equipment shall then resume operation according to its specifications The abnormal service voltage shall not lead to the disconnection of the power supply e g
39. ment mounted on vehicles excluding vehicle components and components designed as part of telecommunications equipment E g radio transmitting and receiving equipment on radio relay vehicles 19 customer premises equipment Information technology equipment used for telecommunications other than telecom center equipment 20 immunity The ability of devices equipment or systems to operate without any performance degradation under electromagnetic disturbances 21 immunity level The maximum immunity test level at which the device equipment or system can operate as intended 22 immunity limit The specified minimum immunity level 23 CISPR French acronym meaning International Special Committee on Radio Interference This special committee was established by the International Electrotechnical Commission to study standards for limits test methods and test facilities with regard to radiated emission 24 ITU T Abbreviation for International Telecommunication Union Telecommunication standardization sector 25 ETS Abbreviation for European Telecommunication Standard produced by the European Telecommunication Standard Institute ETSD 26 TTC Abbreviation for The Telecommunication Technology Committee in Japan 27 ARIB Abbreviation for Association of Radio Industries and Businesses in Japan 7 Nippon Telegraph and Telephone Corp 3 Requirements for custom
40. nnex 5 Repetition frequency kHz 1 The frequency range is scanned as specified However when specified in clause 5 of normative annex an additional comprehensive functional test shall be carried out at a limited number of frequencies The selected frequencies for conducted test are 0 2 1 7 1 13 56 21 27 12 and 40 68 MHz 1 greater than 3 m this frequency fitted Otherwise the 1 5 kV best level is applied without primary protection place radio frequency continuous conducted testing A radio frequency electromagnetic field test may be carried out when a continuous radio frequency disturbance is to be considered system in Japan Applicable only to ports which according to the manufacturer s specification may connect directly to outdoor cables Applicable only to cables which according to the manufacturer s specification supports communication on cable length If the radiated test has been carried out from a frequency lower than 80 MHz then the test range shall only extend up to For ports where primary protection is intended surges are applied at voltages up to 4 kV with the primary protecters The result of testing immunity to a radio frequency electromagnetic field does not always correspond to that of Table 2 considers the integrated grounding system It is also necessary to take into account the separated grounding separated grounding means that several kinds of grounding terminal are connected to e
41. o disturbance characteristics Limits and methods of measurement 17 ISO 9241 3 1992 Ergonomic requirements for office work with visual display terminals VDTs Part 3 Visual display requirements 18 ITU T Recommendation I 241 1 Telephony 19 ITU T Recommendation I 411 Integrated service digital network ISDN user network interfaces 20 ITU T Recommendation K 15 Protection of high capacity transmission systems against overvoltages and HF disturbances 21 ITU T Recommendation K 17 Tests on power fed repeaters using solid state devices in order to check the arrangements for protection from external interference 22 ITU T Recommendation K 20 Resistibility of telecommunication switching equipment to overvoltages and overcurrents 23 ITU T Recommendation K 21 Resistibility of subscribers terminals to overvoltages and overcurrents 24 ITU T Recommendation K 22 Overvoltage resistibility of equipment connected to an ISDN T S bus Blue Book Volume IX November 1988 25 CISPR Publ 24 1997 Information technology equipment Immunity 3 Nippon Telegraph and Telephone Corp characteristics Limits and methods of measurement 26 ITU T Recommendation K 43 2003 Immunity requirements for telecommunication equipment 27 EN55024 1998 Information technology equipment Immunity characteristics Limits and methods of measurement 28 ETS 300 386 1 1994 1997 Equipment engineering EE Public telecommunications network e
42. or and easily corrected are permissible Performance criterion C Failures resulting in a delay in processing after the external disturbance is removed but which can be recovered to normal operation by reset or reboot are permissible Failures resulting in a system abort which can be recovered to normal operation by reset or reboot are permissible 6 4 Data printing 6 4 1 Particular test conditions Data shall be printed by printers or plotters For equipment which has several operation modes test shall be selected in the most typical operation mode 6 4 2 Particular performance criteria Performance criterion A Printers shall maintain the specified printing quality and normal operation 33 Nippon Telegraph and Telephone Corp Performance criterion B No degradation of the printing quality beyond the manufacturer s specification such as distortion of character s or missing pixels is permissible Performance criterion C Printing errors or omission of character s which require reprinting are permissible Input output failure which can be recovered to normal operation by reset or reboot are also permissible 6 5 Data processing 6 5 1 Particular test conditions Data processing such as computation data conversion storage or transfer shall be performed and the results of processing shall be compared with results in normal operation 6 5 2 Particular performance criteria Performance criterion A Failures whic
43. or to recognize the nature of failure by display or by operator s operation The test sequences shall be selected from the following below according to the functions defined by the manufacturer of the equipment to be tested and the performance criterion A B or C shall be selected according to the disturbance to be tested 6 1 Read write and storage of data 6 1 1 Particular test conditions Data read and write cycles shall be repeated with internal storage devices such as semi conductor memories magnetic or optical desks or magnetic tape devices and then the copied back data shall be compared with the original Read only memories ROM shall be read repeatedly and this data compared with the expected data 6 1 2 Particular performance criteria Performance criterion A Storage devices shall maintain normal operation both in read write and in stand by conditions Performance criterion B Failures which can be recovered by read and write retries are permissible temporary delay in processing caused by this process is acceptable Normal operation of the EUT shall be restored after the test self recovery to the conditions immediately prior to the application of the test is accepted where this is a normal means of recovery In these cases operator response is permitted to re initialize an operation Performance criterion C Failures resulting in a delay in processing after the external disturbance is removed but which can be recovere
44. oustic demodulated sound pressure level spl in the receive direction shall not be greater than the values given in table 5 1 Table 5 1 Maximum acoustic demodulated levels at the telecommunications port and at the acoustic receiving device measurement method 1 Frequency band Typed iininitytesi Noise signal Acoustic sound pressure level MHz dBm dB spl 0 15 to 10 Conducted 50 55 10 to 30 Conducted 50 to 30 55 to 75 except 26 95 to 27 29 See 2 See 2 26 95 to 27 29 Conducted 40 65 30 to 80 Conducted 20 85 80 to 1000 except at 900 Radiated 30 75 See 1 900 See 1 Radiated 50 55 1 This requirement is not applicable for countries where no digital mobile services operating at 900 MHz exist NOTE These tests are designed to ensure a minimum acceptable immunity to amplitude modulated radio frequency disturbances for devices having acoustic interfaces The demodulated disturbance levels are higher than those that will be found acceptable in practice The levels in the tests have been chosen for their practical test convenience having regard for the maximum allowed background acoustic noise level of 40 dB spl and the test levels to be applied for functional testing The amplitude modulated disturbances will arise almost invariably from semi conductor junctions behaving as inadvertent square law detectors This means that for every 1 dB change in the level of the applied radio frequency si
45. procedure for a user or an automatic process in conjunction with the network either at the initiative of the local party or the distant party to stop the capability of exchanging information by an orderly return to a state where the establishment of a new call is possible See note to 10 15 network terminator NT Ancillary equipment representing the termination of the telecommunication network 16 telephony service A service providing users with the ability for real time two way speech conversation via a network see ITU T Recommendation I 241 1 17 telecommunication terminal equipment Equipment intended to be connected a public or private telecommunication network that is a to be connected directly to the termination of a telecommunication network in order to send process or receive information or b to interwork with a telecommunications network being connected directly or indirectly to the termination of a telecommunications network in order to send process or receive information 18 telecom center equipment Telecommunication equipment or facilities used only within buildings that are supervised by telecommunication operators a Switching equipment transmission equipment power supply equipment and radio equipment 6 Nippon Telegraph and Telephone Corp b Peripheral equipment directly connected to or used with the equipment listed in a E g workstations controlling equipment listed in a c Equip
46. quipment electromagnetic compatibility EMC requirements Part 1 Product family overview compliance criteria and test levels 29 Report from Telecommunication Technology Council 1998 Partial Reply to Inquiry No 3 About Various Standards of International Special Committee on Radio Interference CISPR Limits and Measurement Methods of Immunity of ITE in Japanese 30 TTC JT K43 2004 Immunity Requirements for Telecommunications Equipment in Japanese 31 ARIB STD T57 2001 EMC standard for radio communication equipment in Japanese 32 ITU T Recommendation K 48 2003 Product family EMC Requirements for each telecommunication network equipment Product Family 33 TTC JT K48 2004 EMC Requirements for each telecommunication network equipment in Japanese 34 CISPR Publ 24 Amendment 1 2001 Information technology equipment Immunity characteristics Limits and methods of measurement NOTE Quoted Japan Industrial Standards 8 10 and 12 consider the Japanese specific grounding condition 2 2 Terminology For the purpose of this TR the definitions contained in the following documents apply ITU T recommendation 1 411 JIS C 0161 International Electrotechnical Vocabulary IEV Chapter 161 In addition the following specific definitions apply 1 continuous wave CW Electromagnetic waves the successive oscillations of which are sinusoidal and identical under steady state conditions which can
47. r impinge For plug in units the physical boundary will be defined by the host unit 9 cable port A point at which a conductor or a cable is connected to the equipment Examples are signal and power ports 10 a telephony call The process exercised in a network and the telecommunication terminal equipment TTE to allow interchange of information speech video or data with another TTE through the network NOTE The call shall be operated in the way specified by the manufactures For circuit switched services the exchange of data shall be considered to be possible when a 64 kbit s channel or equivalent is available for both parties For packet service the exchange of information shall be 5 Nippon Telegraph and Telephone Corp considered to be possible when a virtual path is established to the called TTE 11 to establish a telephony call The operating procedure for a user or an automatic process in conjunction with the network to reach the capability to exchange information with another TTE See note to 10 12 to receive a telephony call The operating procedure for a user or an automatic process initiated by and in conjunction with the network to reach the capability to exchange information with another TTE See note to 10 13 to maintain a telephony call The capability of exchanging information without having to clear and re establish a call See note to 10 14 to clear a telephony call The operating
48. r requirements seseeeeeees 2 1 Electrostatic discharge ESD st ttt 2 2 Electrical fast transients EFT csrsssseres 2 3 Continuous radio frequency disturbances 2 3 1 Continuous radiated disturbances 2 3 2 Continuous conducted disturbances 2 4 Power frequency magnetic field seeeeeeeeee 2 5 Surges jj fteeeeeeees 2 6 Voltage dips and interruptions 3 Conditions during testing seeeseseeee 3 1 General conditions j seeeeseeeee 3 2 Particular conditions EUT operational modes etc 4 Performance criteria seseeseeses 4 1 General performance criteria tt tttttttt 4 2 Particular performance criteria ttt 5 Performance criteria for telecommunication terminal equipment 5 1 Telecommunications terminal equipment TTE having an analog interface 5 1 1 Particular test conditions r rre 5 1 2 Particular performance criteria s t ett 1 Nippon Telegraph and Telephone Corp 5 2 Telecommunications terminal equipment TTE having a digital interface 5 2 1 Particular test conditions seeeeseeees 26 5 2 2 Particular performance criteria 26 5 3 Facsimile se eeeeerere 30 5 3 1 Particular test conditions tenets 30 5 3 2 Particular performance criteria 30 6 Performance criteria for data processing
49. rcised and to be able to respond however the dwell time shall not exceed 5 s at each of the frequencies during the scan The time to exercise the EUT shall not be interrupted as a total time of a program or acycle but related to the reaction time in case of failure of the EUT 2 3 1 Continuous radiated disturbances The test procedure is in accordance with JIS C 1000 4 3 The EUT shall be positioned so that the four sides of the EUT shall be exposed to the electromagnetic field in sequence In each position the performance of the EUT will be investigated In cases of dispute testing on the four surface sides shall take precedence If the EUT is too large to be adequately illuminated by the radiating antenna partial illumination shall be used Partial illumination shall be carried out using one of the following techniques the EUT can be repositioned so that the front surface remains separated from the radiating antenna by the test distance perpendicular with the axis between the calibration point and the radiating antenna in order to illuminate those sections of the EUT outside the previous antenna beam width where the EUT consists of separate modules the modules can be tested separately within the antenna beam with In cases of dispute full illumination of the EUT will take precedence The frequency range can be swept incrementally with a step size not exceeding 4 of the fundamental with a test level of twice the value of the
50. rion 6 1 Radio frequency 1 Vemf See clause 7 1 and A 0 15 80 MHz continuous conducted See 1 section 7 2 5 in TTC See 2 and 3 JT K43 6 2 Surge 0 5 line to line kV See clause 7 1 and B 10 700 u s 1 line to ground section 7 2 3 in TTC See 4 JT K43 6 3 Fast transients 0 25 kV See clause 7 1 and B Capacitive section 7 2 2 in TTC clamp used JT K43 1 Test level is specified by unmodulated level but 80 AM 1 kHz is needed during testing 2 Above 10 MHz the lower test level can be applied The specific level is under study 3 The test level can be defined as equivalent current into 150 Q 4 This test can be applied when appropriate CDN cable exists 4 1 3 Indoor telecommunication ports Immunity requirements for indoor telecommunication ports are specified in table 7 Table 7 Immunity requirements for indoor telecommunication ports of telecom center equipment Environmental itn Be Performance Test specification Units Test method ney ye Remarks phenomenon criterion 7 1 Radio frequency 1 Vemf See clause 7 1 and A 0 15 80 MHz continuous conducted See 1 section 7 2 5 in TTC See 2 and 3 JT K43 7 2 Surge 0 5 line to ground kV See clause 7 1 and B 1 2 50 8 20 u s section 7 2 3 in TTC See 4 JT K43 7 3 Fast transients 0 25 kV See clause 7 1 and B Capacitive section 7 2 2 in TTC clamp used JT K43 1 Test level is specified by unmodulated level but 80 AM 1 kHz is needed
51. up to this frequency 10 Nippon Telegraph and Telephone Corp 3 1 4 AC power port Immunity requirements for AC power ports of customer premises equipment are specified in table 4 Equipment marketed with an AC DC converter is included Table 4 Immunity requirements for input AC power port of customer premises equipment Environmental Test Performance phenomenon specification uae est memod criterion Remans 4 1 Radio frequency 0 15 80 MHz See clause 2 3 A See 1 and 3 continuous 3 V unmodulated rms in normative conducted 80 AM 1 kHz annex 4 2 Voltage dips gt 95 reduction See clause 2 6 B See 2 0 5 period in normative 30 reduction annex C 25 period 4 3 Voltage gt 95 reduction See clause 2 6 C See 2 interruption 250 period in normative annex 4 4 Surge 1 2 50 80 20 Tr Th us See clause 2 5 B See 4 1 line to line kV peak in normative 2 line to earth kV peak annex ground 4 5 Fast transients 1 kV peak See clause 2 2 B 5 50 Tr Th ns in normative 5 Repetition frequency kHz annex 1 The frequency range is scanned as specified However when specified in clause 5 of normative annex an additional comprehensive functional test shall be carried out at a limited number of frequencies The selected frequencies for conducted test are 0 2 1 7 1 13 56 21 27 12 and 40 68 MHz 1 2 Changes to occur at 0 degree crossover point of the volt
52. way described for the reference level shall not be greater than the values given in table 5 4 NOTE 1 A law and u law are both modulation laws applied to PCM coding for acoustic frequency signals The former is used in Europe and latter in North America and Japan Please refer to ITU T recommendation G 711 for details 2 The signal demodulated inside the EUT caused by the disturbance applied during the immunity testing and affects associated equipment connected to the EUT are not considered 28 Nippon Telegraph and Telephone Corp Table 5 4 Maximum demodulated differential mode noise levels measurement method 2 oa Type of immunity test Demodulated differential mode noise dBm 0 15 to 10 Conducted Reference level 10 dB 10 to 30 Conducted Reference level 10 dB to 10 dB except 26 95 to 27 29 See 2 26 95 to 27 29 Conducted Reference level 30 to 80 Conducted Reference level 20 dB 80 to 1000 except at 900 See Radiated Reference level 10 dB 1 900 See 1 Radiated Reference level 10 dB 1 This requirement is not applicable for countries where no digital mobile services operating at 900 MHz exist See note to table 5 1 2 The limits change linearly with the logarithm of the frequency b Selected frequency test The following shall be fulfilled at the spot frequencies specified in tables 1 2 3 and 4 the TTE shall be able to establish a call with telephony service the TT
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