KT Japan Network Service
Next-Generation Network Infrastructure
We provide a variety of solutions tailored to customer needs, including Japan-Korea international circuits, Japan local services, submarine cables, and peering services.
Japan-Korea Premium Line
The highest quality Japan-Korea direct dedicated circuits utilizing KT's submarine cables (KJCN, APG, TPE, etc.), optimized for financial institutions and mission-critical data communication.
Low Latency: 16.5ms
Tokyo–Busan (via KJCN submarine cable)
Route Redundancy
• 3 cable routes (KJCN, APG, TPE)
• Selectable based on customer requirements
* Unprotected / Protected services
Wideband Communication
• Bandwidth: 2Mbps–10Gbps
• Options: LANPHY, WANPHY, OTN
* Flexible bandwidth upgrades via software (POTN & PTN)
Submarine Cable Network
Achieving global connectivity through 9 submarine cables connecting Asia-Pacific to North America.
Subsea Cable Capacity & Pricing
Current capacity and monthly recurring charges on our main subsea routes. Updated every two weeks.
Last updated:
| Route | Cable | Demarcation Points | Available B/W (G) | PRICE (MRC) / 100G | RTD (ms) CLS to CLS | RFS |
|---|---|---|---|---|---|---|
| HK-SG | SJC2 | Mega-I ~ SG3 | 100 | mailEmail us | around 38 | Beginning of AUG (2026) |
| HK-SG | SJC2 | Mega-I ~ SG3 | 300 | around 38 | End of AUG (2026) | |
| HK-SG | SJC1 | Mega-I ~ SG3 | 300 | around 38 | End of September (2026) | |
| SG-JP | APG | SG Changi APG CLS ~ JP Shima APG CLS | 400 | around 63 | AVAILABLE/READY | |
| KR-JP | KJCN | KR Busan CLS ~ JP Kitakyushu CLS | 300 | around 10 | AVAILABLE/READY | |
| KR-SG | APG | KR Busan CLS ~ SG TNM CLS | 1800 | around 56 | AVAILABLE/READY |
Cable Name & Route Details
| Cable Name | Route |
|---|---|
| KJCN | KR — JP |
| SJC2 | HK — SG, SG — JP |
| UNITY | JP — US |
| ADC | SG — JP |
| JUNO | JP — US |
| FASTER | JP — US |
| APG | KR — JP, KR — CN, KR — HK, KR — SG |
| NCP | KR — CN, KR — TW, KR — US, JP — US, CN — JP |
| TPE | KR — JP, KR — CN, KR — TW, KR — US |
Korea Paid Peering Service
We provide a high-quality peering service connecting KT's large-capacity Korean internet backbone with the Japan-Korea fastest network KJCN.
Korea Internet Data Services
We provide optimal data circuit services tailored to your needs, using KT's Korean domestic internet backbone.
Leased Line
Leased Line
A dedicated line service connecting customer premises end-to-end. Using dedicated transmission equipment, we guarantee the highest quality line stability and bandwidth.
- check_circleEnd-to-End Dedicated Circuit
- check_circleHighest Line Stability
- check_circleBandwidth Guaranteed
Internet
DIA
A corporate internet service using KT's enterprise internet backbone 'Kornet.' Supporting bandwidth from 10M to 10G, connecting enterprises via dedicated lines.
- check_circle10M to 10G Support
- check_circleEnterprise Dedicated Line Connection
- check_circleOutstanding Cost Performance
GiGA office
GiGA office
An internet service using corporate cable lines. While applying Kornet's enterprise-grade quality management, we offer cost-effective and reasonable plans.
- check_circleEnterprise Quality Management
- check_circleReasonable Pricing
- check_circleCable Line Connectivity
Get a custom network assessment
Contact our technical sales team for custom infrastructure assessments and dedicated line quotes.
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