1. International Telecommunication Union ITU-T Study Group 05 Damage to equipment in Japan Tetsuya Tominaga Technical Session on Home Networks Geneva, 29/04/2011

2. ITU-T Study Group 05 Special Resistibility (K.44, K.66) TEST Telecomm unication line longitudin al Telecomm unication line transvers e Mains power longitudin al Mains power transvers e Telecomm unication line – Internal port Mains powMer – Internal port Telecomm unication line – Mains power line Internal line longitudin al Internal line transvers e Lightnin g Surge Test 13 kV 10/700 4 kV 10/700 10 kV combina tion 13 kV 10/700 10 kV combina tion 13 kV 10/700 10 kV combina tion Under study Technical Session - Home Networks - Geneva Table II.6-1/K.44 – Resistibility and safety requirements of customer premises equipment powered by mains power Basic level and Enhanced level of resistibility are described in K.21, The special level is described in K.44 and K.66

3. ITU-T Study Group 05 Typical configuration of ONT/HGW o ONT/HGW don’t have external telecom line. o Why the lightning current flows into ONT/HGW? Technical Session - Home Networks - Geneva Fig.1 Typical ONT/HGW 4 Ether ports 2 POTS port 1 Optical fiber port 1 AC adaptor

4. ITU-T Study Group 05 How many ONT/HGW were damaged? It was not acceptable failure rates for 2kV type ONT/HGW o 6 types of ONT/HGW, total 3 million shipments o ONT/HGW has 2 POTS ports and 4 Ether ports o Observation period 2007-2009 o The resistibility between AC mains to POTS are 7kV – 13 kV Technical Session - Home Networks - Geneva Fig.1 Example of Relationship between resistibility and Failure rates Failure rates (%) Resistibility level between POTS ports(kV)

5. ITU-T Study Group 05 What port is damaged in ONT/HGW? Failure portRatio (%) POTS *)60 POTS + Ether29 POTS + Ether + AC adaptor3 Malfunction7 Unknown1 Technical Session - Home Networks - Geneva Table 1. Example for ratio of failure ports AC mains – POTS :10kV AC mains port differential : 2kV Between POTS: 1kV Num =70 70 damaged ONT/HGW were counted the damaged ports Internal POTS port were damaged over 90% *) POTS is may also include other port failure

6. ITU-T Study Group 05 Example of damaged ONT/HGW in the field(1) o Protector elements on POTS ports were damaged Technical Session - Home Networks - Geneva SLIC TEL1 TEL2 Damaged

7. ITU-T Study Group 05 Example of damaged ONT/HGW in the field(2) o Subscriber Line Card Module and protector elements were damaged o Sometimes RJ11 were damaged and burned Technical Session - Home Networks - Geneva Damaged TEL1 TEL2 Damaged RJ11

8. ITU-T Study Group 05 Lightning surge flows into ONT/HGW o Lightning surge flows port to port o These equipment has AC mains port or individual grounding Technical Session - Home Networks - Geneva Fig.1 Typical ONT/HGW 4 Ether ports 2 POTS port 1 Optical fiber port 1 AC adaptor AC port to POTS port AC port to Ether port POTS to POTS POTS to Ether Ether to Ether

9. ITU-T Study Group 05 Configuration and current flow (1) o Case 1: Damage occurred between mains power port and internal port o Damage: Home Gate Way & Telephone o Route: AC mains (1)—AC/DC Adaptor—HGW—Telephone—AC mains (2) Technical Session - Home Networks - Geneva

10. ITU-T Study Group 05 Configuration and current flow(2) o Case 2: Damage occurred between two internal ports of telecom. equipment o Damage: Telecom. Equip 1 (FAX), Home Gate Way & Telecom. Equip 2 (PC) o Route: AC mains (1)–Telecom. Equip 1–HGW–Telecom. Equip 2–SPD–Local PE Technical Session - Home Networks - Geneva

11. ITU-T Study Group 05 Near Future? / Already Now? Technical Session - Home Networks - Geneva SPD ： Surge Protective Device Optic Fiber Smart Meter Smart appliance connects to Home Gateway. Many kinds of equipment will be connected each other.

12. ITU-T Study Group 05 Bad installation and insufficient resistibility Technical Session - Home Networks - Geneva SPD ： Surge Protective Device Optic Fiber Smart Meter Good installation and Adequate resistibility are needed.

13. ITU-T Study Group 05 Conclusion TEST Telecomm unication line longitudin al Telecomm unication line transvers e Mains power longitudin al Mains power transvers e Telecomm unication line – Internal port Mains powMer – Internal port Telecomm unication line – Mains power line Internal line longitudin al Internal line transvers e Lightnin g Surge Test 13 kV 10/700 4 kV 10/700 10 kV combina tion 13 kV 10/700 10 kV combina tion 13 kV 10/700 10 kV combina tion Under study Technical Session - Home Networks - Geneva Table II.6-1/K.44 – Resistibility and safety requirements of customer premises equipment powered by mains power Failure rates is over 0.1 %@2kV and 0.01 %@7kV. Adequate test levels is needed for Internal Port to Internal Port for ONT/HGW