G.hn EoC is emerging as a cost-effective alternative to DOCSIS 3.1 for delivering gigabit internet speeds over existing coaxial cable infrastructure. It utilizes ITU-T G.hn Wave-2 standards and Marvell chipsets to provide up to 2Gbps speeds over coax, phone lines, or power lines using a single technology. The solution includes indoor and outdoor ONUs to connect homes to the fiber network, as well as single-port and four-port CPE devices for end users.

1. NOV 2016
Introduction to ITU-T G.hn EoC
for the Giga Internet Service
www.alc.solutions
Ethernet over Coax

2. 2
Contents
Concept
G.hn EoC : Current Solution
Solution for Fibre area
G.hn Wave-2 Upgrade plan
Introduce ALC Inc.
1
2
3
4
5

3. 3
1.1 Giga Internet Service by media
1. Concept
1. FTTH soultion has been best technology for the GiGa service because low cost optical cable, easy installation and device price down
2. Optical Lan with Use UTP cable, it’s been development 2 pairs ( 4 lines) 500Mbps as Giga service. Now, 2 pairs 1G would be hot item.
3. Phone line, it becomes hot items recently because G.now and G.fast solution are shown in market today.
4. The main line of cable TV, coax cable, DOCSIS3.1 solution is only one solution for the Giga internet service but the service is withdraw
because it needs too much cost. Therefore, instead of DOCSIS system, G.hn EoC is emerging as a good alternative in low cost terms.
AccessNetwork
Home
Network
DOCSIS 2.0 DOCSIS 3.0
EPON GPON
ADSL VDSL VDSL2+
NGPON
DOCSIS 1.1
G.fast
G.now Wave-2
G.hn Wave-2 EOC
DOCSIS 3.1
G.now
HPAV2 EOC G.hn EOC
AON 광LAN 100Mbps 2pair 500Mbps 2pair 1Gbps
MOCA 1.1 MOCA 2.0
HP 1.0 UPA & HPAV
HPNA 1.0 HPNA 2.1 HPNA 3.1
1901 - HPAV
ITU G.hn
G.hn Wave-2
IEEE HPAV2
1990 2000 2005 2010 2015…… 2016
Power Line
Coaxial Line
Phone Line
Fiber Line
Coaxial Line
Phone Line
UTP Line

4. 4
1.2 Marvell G.hn Wave-2 solution
• Marvell’s 88LX3142 digital baseband processor and
Marvell’s 88LX2718 baseband analog front-end chipsets
are ITU-T G.hn standard based and certified at HomeGrid
Forum’s accredited test houses.
• 1 Gbps PHY rate
• Powerline, coax, phone line and POF in a single technology, reducing overall
cost and time to market
• Supports ITU-T G.9960 (PHY), G.9961 (MAC) and G.9964 (PSD)
specifications
• Data transmission rates at more than four times that of legacy systems
• Co-existence with other technologies (HomePlug Powerline, VDSL)
• Interoperability with any G.hn baseband band plans (25, 50, 100 MHz)
• Robust communication mode for high noise environments
• Optimized performance in high density MDUs and neighboring networks
interference mitigation
• Integrated power saving
• Available in commercial grade
• Marvell’s 88LX5153 digital baseband processor and
Marvell’s 88LX2730 analog front-end chipsets are fully
ITU-T G.hn standard compliant, enabling system vendors
to develop 100% interoperable solutions.
• 2 Gbps PHY rate
• Powerline, coax, phone line and POF in a single technology, reducing overall
cost and time to market
• Compliant with ITU-T G.9960/61/62/63/64 (including 200MHz coax and
100MHz MIMO powerline band plans)
• Compliant with ITU-T G.9979 and IEEE 1905.1a
• Compliant with Broadband Forum TR-069
• Compliant with IEEE 802.1 and IEEE 802.3
• SDK available for vendors that need to customize firmware operation
• Available in both Commercial and Industrial grade
• Fully interoperable with previous generation of 1 Gbps G.hn products
• MP : Aug 2016
 G.hn Wave-1  G.hn Wave-2
Performance UP, Cost DOWN
1. Concept

5. 5
1.3 KT announced G.now Wave-2
From: Kwang-Jin Yoon <kyoon@marvell.com>
Date: 2016-10-02 12:49 GMT+09:00
Subject: KT annouceed Gigawire2.0(G.now 2.0) is ready for perfect Giga Internet service
To: Kwang-Jin Yoon <kyoon@marvell.com>
Dear all,
I am so existed/proud to share news that KT announced Gigawire2.0(1Gbps service over 1pair Phone line) on Sep30.
And so much appreciate to all colleague involved in this project with hard work in day and night specially in Spain G.hn R&D team.
We expect ramp up from FY18 in KT/LGU+ and Global carriers to get rid of xDSL system.(Turktel, PLDT, Globe, and Many other regional SP in global).
And G.now has been shown to us that remarkable 900Mbps down (avg was 700Mbps in 100m)performance in bundled phone line hi reliability even worst bundled copper condition.
This performance is enough to make a threat to FTTH deployment and G.fast which revealed which is not suitable in high density building(MDU/APT)and IPTV which required high fidelity seamless
in QOS.
These have been confirmed in LGU+ and PLDT during their trial service in real field(MDU).
Highlight of Gigawire2.0 are that it has capability to offer remarkable performance and high reliability to load Gigabit internet and seamless 4K TV over legacy any copper(UTP, Phone, COAX)
in 1~2pair of it with auto negotiation feature.
Reliability point of you, none of legacy DSL technology even G.fast over copper can beat it specially in old and high signal crosstalk environment.
We also proud of fast link up less than 5sec and high capacity over 1000 Port with device stacking up in same bundle cable.
Here is couple of Link you can see more.
http://www.kt.com/pr/news_01_view.jsp
http://english.etnews.com/20160930200003
http://www.sedaily.com/NewsView/1L1LUH03MC
1. Concept

6. 6
Analog/Digital
Broadcasting
1:8
OTX 1550nm
RF DS : 1550nm
PON DS : 1490nm
PON US : 1310nm
EDFA
EPON OLT
WDM
DHCP NMS
Internet
Coax
Fiber
UTP
Outdoor ONU
(Pole)
Indoor ONU
(MDF)
CPE
CPE
2.1 Basic Network
2. G.hn EoC : Current solution

7. 7
2.2 G.hn EoC Equipment
 Indoor ONU  Outdoor ONU
Item Indoor ONU Outdoor ONU
EoC
Standard ITU-T G.hn ITU-T G.9960/9961/9962/9963/9964
Solution Marvell 88LX3142/ 88LX2718
Data rate Down 400Mbps, Up 200Mbps (TCP)
CPE # 31 CPE/Master
Frequency 2 ~ 100MHz (Variable)
Master # 1EA 2EA
NIM Fiber Optic 1GTX, EPON, GPON, 1GFX
WDM Wavelength
1550nm : CATV Down
1310nm : Data Down
1490nm : Data Up
OTR CATV 1550nm, Variable
RF port No. 2EA 2EA
Power Basic 12VDC/ 2A Adapter 40 ~ 90VAC HFC Power
Environment
Temperature 0℃ ~ 50℃ 0℃ ~ 70℃
Humidity 10% ~ 90% IP66
Housing
Dimension(mm) 295(L) X 170(W) X 70(H) 290(L) X 215(W) X 145(H)
Weight(kg) 3 5.5
Item CPE–1Port CPE-4Ports
EoC
Standard ITU-T G.hn ITU-T G.9960/9961/9962/9963/9964
Solution Marvell 88LX3142/ 88LX2718
Data rate Down 400Mbps, Up 200Mbps (TCP)
Frequency 2 ~ 100MHz (Variable)
LAN 1GTX 1 port 4 ports
L2 Switch Solution Marvell 88E5510 Marvell 88E6341
RF port No. 2
Power Basic 12VDC/ 2A Adapter
Environment
Temperature 0℃ ~ 50℃
Humidity 10% ~ 90%
Housing
Dimension(mm) 170(L) X 120(W) X 40(H)
Weight(kg) 0.53
 CPE-1Port  CPE-4Ports
2. G.hn EoC : Current solution

8. 8
2.3 Function Diagram for ONU
Power Supplier
 Indoor ONU  Outdoor ONU
2. G.hn EoC : Current solution

9. 9
2.4 Function Diagram for CPE
 CPE–4Ports CPE-1Port
2. G.hn EoC : Current solution

10. 10
2. G.hn EoC : Current solution
2.5 EPON OLT : U9016B
The U9016B is a PON Optical Line Termination(OLT) with 2RU height of compact
Its front access design allows rapid installation and reduced maintenance time. The U9016B OLT can be used for
various passive optical network applications such as FTTH, FTTB, and FTTC.
The U9016B is designed to accept 1 (one) SCU (Switch and Control Unit), 2 (two) PSUs (Power Supply Units), 2 (two)
PIUs (PON Interface Units), and 1(one) FMU(Fan Module Unit).
The SCU has built-in 4 x 1000Base-X (SFP) ports and 2 x 10GBase-R (SFP+) ports for uplinks.
The PSUs are hot swappable and supports load-balancing.
The PIU is an interface card with 8 (eight) PON ports. The PIUs of U9016B are fully compatible with the U9264H, a
high density OLT model, which allows service providers to reduce CAPEX and OPEX when they build Passive Optical
Networks in combination of U9016B and U9264H.
At the user side, the U9016B terminates PON links and connects ONUs or ONTs over PON. At the network side, it
terminates Gigabit Ethernet or 10G Ethernet links (GE/10GE) for Service Node Interfaces(SNIs). The SNIs of U9016B
can be bind in LACP protocol to connect to the aggregation switch for link protection.
The U9016B can be configured and managed by the Command Line Interface (CLI) locally. It can be also managed
remotely by the secure SSH command line or through the Simple Network Management Protocol Version 3
(SNMPv3). For remote management, out-of-band and in-band management modes are supported.

11. 11
2. G.hn EoC : Current solution
2.6 NIM
RJ-45
RJ-45
2 x
GE
port
 NIM : 1GTX I/F NIM : EPON ONT
BCM53125
Giga Switch
SFP
2 x
GE
port
Dual
Trans
TK371x
EPON ONU

12. 12
3. Solution for Fibre area
3.1 One core Solution
 CATV & EoC
 WDM
RF DS : 1550nm
PON DS : 1490nm
PON US : 1310nm
EoC : 2 ~ 67Hz
CATV : 85MHz ~
RF DS : 1310nm
PON DS : 1490nm
PON US : 1310nm
PON DS : 1490nm
PON US : 1310nm
EoC : 2 ~ 67Hz
CATV : 85MHz ~
RF DS : 1310nm
PON DS : 1490nm
PON US : 1310nm
RF DS : 1550nm

13. 13
 1550nm OTX ( C-16003) is a high performance 1550nm
External Modulation fiber optic transmitter for cable TV
system.
 It is 1RU 19” rack mountable and a cost effective solution
with high optical power up to 10dBm.
 1 RF input and 4 Optical output port
 3dBm per each output port
 Used alone or coupled with EDFAs.
 For CATV(54MHz∼1000㎒ bandwidth, 77 ch analog Channel
+ digital Channel)
 Offers excellent CNR, and low distortion performance for
long distance.
 Low chirp, high linearity DFB laser, chirp compensation.
 Automatic/Manual gain control mode.
 Front panel LED display function(change red color when no
signal)
 Optical and RF level, DC voltage display (green color)
 Front panel RF level adjust point, RF test point(-20dB) and
optical test point(DC voltage)
 Support Control interface is DB9 or RJ45
 Input Power 110~240VAC
 RF Connector is F Type female
3.2 1550nm Forward Optical Transmitter ( C-16003 )
Description unit Specification
Optical
Parameters
Wavelength nm 1550±10
Output power dBm 2×9
Optical return loss >60
Connector type SC／APC
RF
Parameters
bandwidth MHz 45-1GHz
Input level dBmV 23±5
Flatness ㏈ ± 0.75
Return loss ㏈ >16
Input impedance Ω 75
Link
Parameters
channels 77CH + Digital
CNR ㏈ >52
CTB ㏈ >65
CSO ㏈ >65
SBS dBm 13,16,18.5
General
Parameters
Net interface RJ45，R232
Power VAC 90~265
Power comsumption W <50
Working Temp ℃ 0~50
Storage Temp ℃ -20~85
Working relative Temp % 20%~85%
3. Solution for Fibre area

14. 14
3.3 1550nm EDFA ( C-16004 )
 1550nm EDFA (C-16004) is 19inch 1U rack Erbium-Doped Fiber
Amplifier for Cable TV system.
 It provides high quality performance in reliability, output power
stability and noise level.
 Its optical module employ high performance 980nm(or 1480nm)
pump Laser Diode
 Electrical module employ microprocessor to offer the control of
various electrical information, such as pump LD current, pump LD
temperature, input & output optical power.
 Rack mountable type or housing type(option) for outdoor use.
 1530~1560nm single channel amplification.
 Use cooled pump Laser Diode
 1 Optical input and 4 Optical output port
 High power stability
 Input and output monitors for easy diagnose
 Input power : 0~3dBm
 Output power : 17dBm±1dB
 High luminescent LCD display (20x2 letters)
 Alarms through multifunctional display
 Free voltage(110~240V, 50~60Hz), SMPS
 Operating temperature : -10˚C ~ +65˚C
 Support Control interface is DB9 or RJ45
Description Specification
Operating Wavelength Range 1530 to 1560nm
Input Power 0 ~ 3 dBm
Output Power 17dBm±1dB
Output Power stability Max. 0.2dB
Noise Figure 5dB ±1
Isolation (Input/Output) 30dB
Return Loss(Input/Output) 45dB
Polarization Dependent Gain 0.5dB
Polarization Mode Dispersion 0.5ps
Pump Leakage -30dBm
Backward ASE Leakage -30dBm
Optical Connector(Input/Output) SC/APC
Input Requirement 110~240V / 14W
Operating Temperature -10℃ to 65℃
Storage Temperature -25℃ to 85℃
Operating Humidity 0 to 90%
3. Solution for Fibre area

15. 15
3.4 WDM
WDM (C-16005) (C-16007)
Description WDM (C-16005)
Wavelength
1550nm for CATV
1310/1490 for PON
Maximum insertion loss Less than 2dB
Pass port insertion loss 40dB
Return Loss 45dB
Directivity for every port 40dB
Channel passband 1550~1560nm
PDL 0.2dB
Power handing 500mW
Isolation band 1 1260~1360nm
Isolation band 2 1480~1550nm
Maximum COM Port
4 per WDM304
48 C16007) per
WDM (C-16005)
Operating Temperature -10℃ to 70℃
Insertion loss Temperature
sensitivity -20℃ to 70℃@0.25dB
Storage Temperature -25℃ to 85℃
Operating Humidity 0 to 90%
Dimensions (W×H×D) 484 × 44 × 365 mm
Weight 3.0 Kg
WDM ( C-16006)
Description WDM (C-16006)
Wavelength
1550/1610nm for CATV
1310/1490 for PON
Maximum insertion loss Less than 2dB
Pass port insertion loss 40dB
Return Loss 45dB
Directivity for every port 40dB
Channel pass band 1540~1560 nm
1600~1620 nm
PDL 0.2dB
Power handing 500mW
Maximum COM Port 4 per WDM ( C16006)
Operating Temperature -10℃ to 70℃
Insertion loss Temperature
sensitivity -20℃ to 70℃@0.25dB
Storage Temperature -25℃ to 85℃
Operating Humidity 0 to 90%
Dimensions (W×H×D) 484 × 44 × 365 mm
Weight 3.0 Kg
3. Solution for Fibre area

16. 16
4.1 Summary
4. G.hn Wave-2 Upgrade plan
Element Now On Developing Time Remark
OLT
EPON EPON -
- GPON JAN 2017
NIM
EPON( EPON -
- GPON JAN 2017
- SFP ONT Stick FEB 2017
- 1G TX FEB 2017
1GTX I/F(for test) 1GTX I/F(for test) -
EoC Master
G.hn Master
(Not support SNMP)
G.hn Master
(SNMP 지원)
JAN 2017
- G.hn Wave-2 Master APR 2017
EoC CPE
G.hn 1 x 1GTX G.hn 1 x 1GTX JAN 2017 Low cost
- G.hn Wave-2 1 x 1GTX APR 2017 Low cost
G.hn 4 x 1GTX G.hn 4 x 1GTX -
- G.hn Wave-2, 4 x 1GTX APR 2017
-
G.hn Wave-2, 4 x 1GTX,
WiFi AP(802.11ac)
MAY 2017
ONU
Indoor, 1 EoC master Indoor, 1 EoC master -
Outdoor, 2 EoC master Outdoor, 2 EoC master -
-
Indoor, Multi EoC master
G.hn Wave-2
MAY 2017 For EU

17. 17
4.2 GPON OLT : Box type
G-16001 OLT ( 8ports) & G-16002 (16ports) complies with ITU-T G.984/G.988 and meets requirements about
GPON OLT in Network Access Technical Requirements. It fully supports CTC2.0, automatic discovery and
cooperation with ONUs of different manufacturers.
G-16001 OLT ( 8ports) & G-16002 (16ports) support the symmetric uplink 1.25Gbps/downlink 2.5Gbps PON
transmission rate, efficient bandwidth usage and Ethernet services, helping carriers to provide reliable services
to their users.
Its coupling ratio ups to 1:128, and its support of different hybrid ONU networks minimize the carrier’s investment.
G-16001 OLT ( 8ports) & G-16002 (16ports) based on the edge-cutting technologies, is strong in functions. A few
of its functions such as QoS guarantee, SLA and DBA can be easily listed out.
 G-16002 : 16 PON G-16001 : 8 PON
4. G.hn Wave-2 Upgrade plan

18. 18
4.3 GPON OLT : Shelf type ( G-16101 )
Overview
G-16101 is medium capacity G-PON OLT systems for FTTH services depending network environme
nt that can be used as a aggregation gigabit Ethernet L3 switch.
G-PON OLT for FTTH services can be operated at the same time in Ethernet services can operate
as a single device in the network environment, the system is flexible and responsive.
Key Features
L2 Features
• Port-based VLAN, IEEE 802.1q TaggedVLAN
• VLAN stacking (Q-in-Q)/VLANTranslation
• 802.1p packetpriority
• Spanning Tree Protocol(STP/RSTP/MSTP)
• 802.3ad Link Aggregation ControlProtocol
• Jumbo frame9KB
• Self loopdetection
L3 Features
• Static Routing, RIP v1/v2, OSPF v2, BGP v4,
VRRP
• Multiple default gateway
G-PON
• Compliance with G-PON OLT ITU-T G.984
• ITU-T G.984 OMCI. ITU-T 984.3 DBA(SR/NSR)
• Up to 60Km logical reach, 128bit AES,FEC
• ONU/ONT management : Vlan operation,QoS,
filter, Rouge ONU, VoIP(SIP), SW upgrade
Multicast
• IGMP v1/v2/v3
• IGMP snooping / IGMP static join
• IGMP redundancyproxy
• PIM-SM/SSM
QoS
• Classification
L2 : SRC/DST MAC, Ether type, 802.1p priority, VLAN ID
L3 : SRC/DST IP, TOS, DSCP, IP Precedence
L4 : SRC/DST TCP/UDP port, ICMP
• Mark/remark/policing
• Traffic scheduling (SPQ, WRR,SPQ+WRR, DWRR)
• 8 queues per port,Mark/remark/policing
• Traffic policing and shaping, Ratelimiting
Security
Redundancy
• Control/Switch redundancy (Active/Standby)
• GPON-Link redundancy
• ALC (Access ControlLists)
• Storm control (broadcast,multicast, DLF)
• IP packet filtering, DoSProtection
• NetBIOS, NetBEUI, NBT, CIFS, SSDP, WSDDfiltering
Management
• CLI(serial /Telnet)
• Dual OS (firmware)
• Remote OS upgrade (FTP/ TFTP)
• Multiple configurationfiles
• Remote configuration upgrade(FTP/TFTP)
• Port/Protocolmirroring
• SNMP v1/v2/v3
• RMON history
• Syslog
• DHCP server, relay agent with option82
• RADIUS, TACACS+, SSH
• PPPoE IntermediateAgent
• Ethernet OAM (802.3ah EFM Standard Fullsupport)
4. G.hn Wave-2 Upgrade plan

19. 19
4.4 NIM (Network Interface Module)
1GTX
1GFX
GPON EPON
1GTX I/F for Test
 The kind of NIM
4. G.hn Wave-2 Upgrade plan
SFP

20. 20
4.5 EoC Master module
4. G.hn Wave-2 Upgrade plan
TX
RX
DAC
ADC
88LX2718
Coax
Coupling
SPI1
88LX3142
MD
RGMII
88E1510
COAX
Cable
GE
Trans
GE
port
TX
RX
DAC
ADC
88LX2730
Coax
Coupling
SPI1
88LX5153
COAX
Cable
GE
Trans
GE
port
L2 Switch SoC
Port5Port6
Port1Console
port
GE
Trans
TX
RX
DAC
ADC
88LX2718
Coax
Coupling
SPI1
88LX3142
MD
RGMII
COAX
Cable
GE
Trans
GE
port
L2 Switch SoC
Port5Port6
Port1Console
port
GE
Trans
MD
RGMII
 G.hn Master
 G.hn Master w SNMP
 G.hn Wave-2 Master

21. 21
4.6 EoC CPE
4. G.hn Wave-2 Upgrade plan
 G.hn 1x1GTX
 G.hn 4x1GTX
 G.hn 1x1GTX V.E.
 G.hn Wave-2 1x1GTX V.E.
 G.hn Wave-2 4x1GTX
 G.hn Wave-2 4x1GTX AP
Diplexer
RF PORT
TV OUT
GE port
G.hn EoC
Slave
Diplexer
G.hn
Wave-2
EoC
Slave
L2 Switch
RF PORT
TV OUT
GE port 1
GE port 2
GE port 3
GE port 4
802.11ac
AP
Diplexer
G.hn
Wave-2
EoC
Slave
L2 Switch
RF PORT
TV OUT
Diplexer
GE PHY
RF PORT
TV OUT
GE port
G.hn
Wave-2
EoC
Slave
GE PHY
Diplexer
RF PORT
TV OUT
GE port
G.hn EoC
Slave
L2 Switch
Diplexer
G.hn
Wave-2
EoC
Slave
L2 Switch
RF PORT
TV OUT
GE port 1
GE port 2
GE port 3
GE port 4
GE port 1
GE port 2
GE port 3
GE port 4

22. 22
4.7 Multi-Master ONU
Open chassis allows pay as you grow
Coax or Phone Line
Line Card future proofs upgrades an
d reduces service time
Active cooling Dual WAN SFP allows direct, daisy ch
ain or ring architecture
Independent WAN and LAN monitoring red
uces troubleshooting and testing
4. G.hn Wave-2 Upgrade plan

23. 23
4.8 NMS
▪ PON /EOC System control and Monitoring
- OLT, ONT,ONU, EoC-M, EoC-S Control and Monitoring
▪ Management the Subscriber and Service Product
- New Subscriber Registration
- Problem Fixing
- Interconnection with SMS
- Delinquent Subscriber Management
- Subscriber Call History Management
OLT
ONT
EOC-S
NMS
Subscriber
Registration
System
EOC-S
ONU
Outdoor
▪ Equipment Configuration Setup
▪ Traffice Monitoring per Port
▪ Alarm via SMS or E-Mail
▪ Group/Node Management
▪ User Account Authorization
▪ DHCP Status Monitoring
▪ Log Analysis
ONU
Indoor
Billing /SMS
4. G.hn Wave-2 Upgrade plan

24. 24
4.9 Roadmap
4. G.hn Wave-2 Upgrade plan
3Q, 2016 4Q 1Q 2017 2Q
Indoor Outdoor
G.hn Master G.hn W2 Master
1GTXSFPGPONEPON 1GTX I/F
CPE-4P
CPE-1P CPE-1P/V.E.
CPE-4P-W2
CPE-1P-W2
 ONU
 Master
 NIM
 CPE
G.hn Master/SMNP
CPE-4P-W2-AP
G.hn W2 Multi Master

25. 25
5. Introduce ALC Inc.
Company Name ALC Inc.
C.E.O Lee, Sung-Gil
Address 25-210 LSRO 92, Dongan-Gu, Anyang-Si, Gyeonggi-do, Korea
Projects
Network devices development : G.hn EoC project
Networks devices sales : Thailand, Tanzania, Australia, etc
IoT : SKT LoRa Smart LED light, BLE etc
AMI Consulting : ATAW Solution exports
CCTV : Woolsan-city local area slaes, Hanwha Techwin partner
Web www.alc.solutions
 G.hn (Giga home network) ITU G.9960/9961
 IoT (Internet of Things)
 BLE (Bluetooth Low Energy) Bluetooth4.0
 AMI (Advanced Metering Infrastructure)
 ATAW Co., Ltd. www.ataw.co.kr
 Hanwha Techwin : cctv.hanwhatechwin.co.kr

26. 26