damage to equipment in japan
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
International Telecommunication Union
ITU-T Study Group 05
Damage to Damage to equipment in equipment in
JapanJapanTetsuya Tominaga
Technical Session on Home NetworksGeneva, 29/04/2011
ITU-TStudy Group 05
Special Resistibility(K.44, K.66)
TEST
Telecommunication line longitud
inal
Telecommunication line transver
se
Mains power
longitudinal
Mains power
transverse
Telecommunication line
– Internal
port
Mains powMer
– Internal
port
Telecommunication line – Mains power
line
Internal line
longitudinal
Internal line
transverse
Lightning
Surge Test
13 kV 10/700
4 kV 10/700
10 kV combination
10 kV combination
13 kV 10/700
10 kV combination
13 kV 10/700
10 kV
combination
Under study
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
ITU-TStudy 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
ITU-TStudy Group 05
How many ONT/HGW were damaged?It was not acceptable failure rates for 2kV type ONT/HGWo 6 types of ONT/HGW, total 3 million shipmentso ONT/HGW has 2 POTS ports and 4 Ether portso 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
Fai
lure
rat
es (
%)
Resistibility level between POTS ports(kV)
ITU-TStudy Group 05
What port is damaged in ONT/HGW?
Failure port Ratio (%)POTS *) 60
POTS + Ether 29POTS + Ether + AC
adaptor3
Malfunction 7Unknown 1
Technical Session - Home Networks - Geneva
Table 1. Example for ratio of failure ports
AC mains – POTS :10kVAC mains port differential : 2kV
Between POTS: 1kVNum =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
ITU-TStudy Group 05
Example of damaged ONT/HGW in the field(1)
o Protector elements on POTS ports were damaged
Technical Session - Home Networks - Geneva
SLICTEL1
TEL2
Damaged
ITU-TStudy Group 05
Example of damaged ONT/HGW in the field(2)
o Subscriber Line Card Module and protector elements were damagedo Sometimes RJ11 were damaged and burned
Technical Session - Home Networks - Geneva
Damaged
Damaged
TEL1
TEL2
Damaged
RJ11
ITU-TStudy Group 05
Lightning surge flows into ONT/HGW
o Lightning surge flows port to porto 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
PO
TS
to
PO
TSP
OT
S t
o E
therE
ther
to
Eth
er
ITU-TStudy Group 05
Configuration and current flow (1)o Case 1: Damage occurred between mains power port and internal porto Damage: Home Gate Way & Telephoneo Route: AC mains (1)—AC/DC Adaptor—HGW—Telephone—AC mains (2)
Technical Session - Home Networks - Geneva
Optical Fiber ONU
HGW
d.c. a.c. mainsWAN
＜ Equipment＞
AC/DCAdapter
Internal port Mains power port
Customer Premises
Telecomequipment
ONU : Optical Network Unit HGW: Home GatewaySPD : Surge Protective Device
a.c. mains
Lightning surgeEthernet port
Optical line port
Annex building
Optical Fiber ONU
HGW
d.c. a.c. mainsWAN
＜ Equipment＞
AC/DCAdapter
Internal port Mains power port
Customer Premises
Telecomequipment
ONU : Optical Network Unit HGW: Home GatewaySPD : Surge Protective Device
a.c. mains
Lightning surgeEthernet port
Optical line port
Annex building
ITU-TStudy Group 05
Configuration and current flow(2)
o Case 2: Damage occurred between two internal ports of telecom. equipmento 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
L１
N
L2
L１
N
N
L2
ONU/HGW
SPD
SPD
Optical Fiber
AC/DC Adapter
d.c.
Mains power port
Telecom equipment 1
Telecomequipment 2
Internal port
Customer Premises
Washing machine
Lightning surge
Protective earth
Internal port
Optical line port
L１
N
L2
L１
N
N
L2
ONU/HGW
SPD
SPD
Optical Fiber
AC/DC Adapter
d.c.
Mains power port
Telecom equipment 1
Telecomequipment 2
Internal port
Customer Premises
Washing machine
Lightning surge
Protective earth
Internal port
Optical line port
ITU-TStudy Group 05
Near Future? / Already Now?
Technical Session - Home Networks - Geneva
SPD ： Surge Protective Device
OpticFiber
Smart Meter
Smart appliance connects to Home Gateway.Many kinds of equipment will be connected each other.
ITU-TStudy Group 05
Bad installation and insufficient resistibility
Technical Session - Home Networks - Geneva
SPD ： Surge Protective Device
OpticFiber
Smart Meter
Good installation and Adequate resistibility are needed.
ITU-TStudy Group 05
Conclusion
TEST
Telecommunication line longitud
inal
Telecommunication line transver
se
Mains power
longitudinal
Mains power
transverse
Telecommunication line
– Internal
port
Mains powMer
– Internal
port
Telecommunication line – Mains power
line
Internal line
longitudinal
Internal line
transverse
Lightning
Surge Test
13 kV 10/700
4 kV 10/700
10 kV combination
10 kV combination
13 kV 10/700
10 kV combination
13 kV 10/700
10 kV
combination
Under study
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