Shuguang Qi, Associate Rapportuer of Q19/SG5, qishuguang@catr

1. ITU Workshop on “Greening the Future: Bridging the Standardization Gap on Environmental Sustainability” (Colombo, Sri Lanka, 3-4 October 2013) ITU-T L.1200Direct current power feeding interface up to 400 V at the input to telecommunication and ICT equipment Shuguang Qi, Associate Rapportuer of Q19/SG5, qishuguang@catr.cn

2. Content General Introduction Interface P System Voltage ranges Other requirements HVDC Application

3. Content General Introduction Interface P System Voltage ranges Other requirements HVDC Application

4. General Introduction Contents Define Interface Normal and abnormal voltage ranges, and immunity test levels for ICT equipment to maintain the stability of telecommunication and data communication services. This Recommendation specifies the direct current (DC) interface between the power feeding system and ICT equipment connected to it. Summary

5. Content General Introduction Interface P System Voltage ranges Other requirements HVDC Application

6. Interface P in ITU-T L.1200 Interface P

7. Content General Introduction Interface P System Voltage ranges Other requirements HVDC Application

8. Normal Output Voltage Ranges in ITU-T L.1200 Target solutions Transitional solutions ICT equipment shall maintain a specified normal service is 192 V-288 V. – The minimum voltage is 260 V. – The maximum voltage is 400 V. System Normal Output voltage ranges

9. Content General Introduction Interface P System Voltage ranges Other requirements HVDC Application

10. Other requirements in ITU-T L.1200 • Abnormal DC voltage range For Target solution: –(0V < U < 260 V); –(400V < U < 410 V). • Abnormal conditions –Voltage variations; –Voltage dips; –Voltage interruptions; –Voltage surges/transients; –Inrush current.

11. Other requirements in ITU-T L.1200 UT to 410V,back to UT UT to 400V,back to UT UT to 420V,back to UT UT to 260V,back to UT Duration :10ms Requirements: Temporary loss of function, automatic recovery Duration :1s Requirements: Temporary loss of function, automatic recovery Duration :1 min Requirements: Normal performance Duration :1 min Requirements: Normal performance • Abnormal conditions: Voltage variations

12. Other requirements in ITU-T L.1200 UT to 260V,back to UT Duration :10ms Requirements: Normal performance • Abnormal conditions: Voltage dips

13. Other requirements in ITU-T L.1200 UT to 0V,back to UT UT to 0V,back to UT High impedance Duration : 1s Temporary loss of function, automatic recovery Low Impedance: Duration :10 ms Requirements: Normal performance Abnormal conditions: Voltage interruptions

14. Other requirements in ITU-T L.1200 2 kV 500V 2 kV 500V Line to Ground 1.2/50 μs (8/20 μs) Requirements: Temporary loss of function, automatic recovery Line to Line 1.2/50 μs (8/20 μs) Requirements: Temporary loss of function, automatic recovery Line to Line 1.2/50 μs (8/20 μs) Requirements: Normal performance Line to Ground 1.2/50 μs (8/20 μs) Requirements: Normal performance • Abnormal conditions: Surges/transients

15. Other requirements in ITU-T L.1200 0.5 Abnormal conditions: Inrush Current

16. Content General Introduction Interface P System Voltage ranges Other requirements HVDC Application

17. HVDC Application 380V 240V 300V 1)China Telecom • NTT Lab • France Telecom • China Mobile 1) Korean Telecom 2) NTT NEDO

18. Thank You !