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Damage to equipment in Japan. Tetsuya Tominaga. Technical Session on Home Networks Geneva , 29/04/2011. Special Resistibility (K.44, K.66). Basic level and Enhanced level of resistibility are described in K.21, The special level is described in K.44 and K.66.

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damage to equipment in japan

Damage to equipment in Japan

Tetsuya Tominaga

Technical Session on Home Networks

Geneva, 29/04/2011

special resistibility k 44 k 66
Special Resistibility(K.44, K.66)

Basic level and Enhanced level of resistibility are described in K.21, The special level is described in K.44 and K.66

Table II.6-1/K.44 – Resistibility and safety requirements of customer premises equipment powered by mains power

Technical Session - Home Networks - Geneva

typical configuration of ont hgw
Typical configuration of ONT/HGW
  • ONT/HGW don’t have external telecom line.
  • Why the lightning current flows into ONT/HGW?

4 Ether ports

1 Optical fiber port

1 AC adaptor

2 POTS port

Fig.1 Typical ONT/HGW

Technical Session - Home Networks - Geneva

how many ont hgw were damaged
How many ONT/HGW were damaged?

It was not acceptable failure rates for 2kV type ONT/HGW

  • 6 types of ONT/HGW, total 3 million shipments
  • ONT/HGW has 2 POTS ports and 4 Ether ports
  • Observation period 2007-2009
  • The resistibility between AC mains to POTS are 7kV – 13 kV

Failure rates (%)

Resistibility level between POTS ports(kV)

Fig.1 Example of Relationship between resistibility and Failure rates

Technical Session - Home Networks - Geneva

what port is damaged in ont hgw
What port is damaged in ONT/HGW?

70 damaged ONT/HGW were counted the damaged ports

Internal POTS port were damaged over 90%

Table 1. Example for ratio of failure ports

*) POTS is may also include other port failure

AC mains – POTS :10kV

AC mains port differential : 2kV

Between POTS: 1kV

Num =70

Technical Session - Home Networks - Geneva

example of damaged ont hgw in the field 1
Example of damaged ONT/HGW in the field(1)
  • Protector elements on POTS ports were damaged

TEL1

SLIC

TEL2

Damaged

Technical Session - Home Networks - Geneva

example of damaged ont hgw in the field 2
Example of damaged ONT/HGW in the field(2)
  • Subscriber Line Card Module and protector elements were damaged
  • Sometimes RJ11 were damaged and burned

Damaged

TEL1

TEL2

Damaged

Damaged

RJ11

Technical Session - Home Networks - Geneva

lightning surge flows into ont hgw
Lightning surge flows into ONT/HGW
  • Lightning surge flows port to port
  • These equipment has AC mains port or individual grounding

Ether to Ether

4 Ether ports

1 Optical fiber port

POTS to Ether

AC port to Ether port

POTS to POTS

1 AC adaptor

2 POTS port

AC port to POTS port

Fig.1 Typical ONT/HGW

Technical Session - Home Networks - Geneva

configuration and current flow 1
Configuration and current flow (1)
  • Case 1: Damage occurred between mains power port and internal port
  • Damage: Home Gate Way & Telephone
  • Route: AC mains (1)—AC/DC Adaptor—HGW—Telephone—AC mains (2)

Technical Session - Home Networks - Geneva

configuration and current flow 2
Configuration and current flow(2)
  • Case 2: Damage occurred between two internal ports of telecom. equipment
  • Damage: Telecom. Equip 1 (FAX), Home Gate Way & Telecom. Equip 2 (PC)
  • Route: AC mains (1)–Telecom. Equip 1–HGW–Telecom. Equip 2–SPD–Local PE

Technical Session - Home Networks - Geneva

near future already now
Near Future? / Already Now?

Smart appliance connects to Home Gateway.

Many kinds of equipment will be connected each other.

Optic

Fiber

Smart Meter

SPD:Surge Protective Device

Technical Session - Home Networks - Geneva

bad installation and insufficient resistibility
Bad installation and insufficient resistibility

Good installation and Adequate resistibility are needed.

Optic

Fiber

Smart Meter

SPD:Surge Protective Device

Technical Session - Home Networks - Geneva

conclusion
Conclusion
  • 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

Table II.6-1/K.44 – Resistibility and safety requirements of customer premises equipment powered by mains power

Technical Session - Home Networks - Geneva

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