SJC (Singapore-Japan Cable)

SJC (Singapore-Japan Cable)
Name	SJC (Singapore–Japan Cable)
Owners	Consortium
Length	8,000 km (approx.)
Design capacity	5.76 Tbps (initial)
First service	2013
Status	Active

SJC (Singapore-Japan Cable)

The SJC (Singapore–Japan Cable) is a submarine telecommunications system connecting Singapore with Japan and intermediate locations across the South China Sea, Philippine Sea and western Pacific Ocean. It provides high‑capacity fiber connectivity that supports traffic between major hubs such as Tokyo, Osaka, Singapore and regional metropolises including Manila, Hong Kong, Taipei and Jakarta. The system integrates into the global network topology alongside links like SEA-ME-WE 3, Asia-Pacific Gateway and Japan–US Cable Network to serve carriers, content providers and financial markets in East Asia, Southeast Asia and beyond.

Overview

The project was developed amid 21st‑century demand for low‑latency links serving Tokyo Stock Exchange, Singapore Exchange, Hong Kong Stock Exchange participants, hyperscale cloud platforms such as Amazon Web Services, Google Cloud Platform, Microsoft Azure, content networks like Facebook and Netflix, and regional carriers including NTT Communications, SoftBank, Singtel, Telekom Malaysia and PLDT. It complements transoceanic systems like Trans-Pacific Express and regional rings such as EAC-C2C to enhance resilience for traffic between East Asia and Southeast Asia. Stakeholders cited considerations from regulatory bodies including the Infocomm Media Development Authority and national agencies in Japan and Singapore during planning.

Route and Landing Points

The cable follows a route linking multiple landing stations and branching units to serve strategic nodes. Primary terminal points include landing stations near Chiba Prefecture serving the Greater Tokyo Area, and a landing near Chiba or Kanagawa Prefecture connected to metropolitan clusters including Yokohama. Southern terminations occur at facilities in Jurong Island and Changi serving the Port of Singapore cluster. Intermediate or branching landings historically associated with the system connect to hub islands and coastal cities such as Okinawa Prefecture and points near Taiwan and the Philippines to interoperate with terrestrial backhaul operated by companies like NTT East, KDDI, China Mobile, China Telecom and PCCW Global.

Technical Specifications

SJC was specified as a high‑fiber‑pair cable using optical amplification and dense wavelength division multiplexing (DWDM) technology similar to implementations by suppliers such as Fujitsu, NEC Corporation, SubCom and Alcatel-Lucent Submarine Networks. Typical parameters included repeaters (erbium‑doped fiber amplifiers) every 50–100 km, optical fiber types comparable to ITU‑T G.652 standards used by carriers like NTT Communications and Singtel, and a design capacity initially reported in the terabits per second range with upgrade paths via coherent modulation formats (e.g., 100G/200G/400G) adopted by operators including KDDI and SoftBank. Landing stations used cable landing frames, power feed equipment, and diverse routing practice akin to systems managed by Tata Communications and Hutchison Global Communications.

Construction and Operation

Construction contracts were awarded to marine engineering firms with experience in projects such as TAT-14 and FLAG Europe-Asia, employing cable ships similar to those used by CS Global Sentinel and Pierre de Fermat. Laying operations required coordination with port authorities in Tokyo Bay, Keihin, Singapore Port, and coastal regulators in Okinawa and Palawan and navigational agencies including the Maritime and Port Authority of Singapore. Operational management involves network operations centers (NOCs) staffed by carrier partners and coordinated fault‑isolation procedures influenced by best practices from carriers like Verizon Business, AT&T, and NTT Communications.

Capacity, Traffic and Usage

Capacity provisioning supports wholesale wavelength services, leased capacity to multinational enterprises, and peering for content delivery networks such as Akamai Technologies and Cloudflare. The system carries financial trading traffic to exchanges like the Tokyo Stock Exchange and Singapore Exchange, latency‑sensitive services for gaming companies in South Korea, and backhaul for multinational data centers operated by Equinix and Digital Realty. Usage patterns mirror broader trends observed on systems like APG and SJC (Singapore–Japan Cable) — do not link this name in peak seasonal demand driven by e‑commerce platforms such as Alibaba Group, Rakuten, Shopee and media streaming.

Ownership and Consortium

Ownership is by a consortium structure typical of regional cables, comprising national carriers, international wholesale providers, and infrastructure investment entities comparable to consortia behind SEA-ME-WE 4 and EAC-C2C. Potential members include companies akin to Singtel, KDDI, NTT Communications, PLDT, Hutchison Telecommunications, and infrastructure funds similar to Macquarie Group. Consortium governance follows commercial agreements for capacity allocation, maintenance responsibilities, and landing rights negotiated with local authorities such as the Ministry of Internal Affairs and Communications (Japan) and Singaporean regulators.

Incidents and Maintenance Records

SJC experienced periodic maintenance operations and fault repairs typical for submarine systems, including scheduled repeaters upgrades, cable burial renewal, and fault localization using techniques deployed by ships like Ile de Sein and Cable Innovator. Incidents reported on comparable regional systems—caused by typhoon‑driven seabed movement, anchoring by vessels registered under flags such as Panama or Liberia, and fishing operations near continental shelves like the South China Sea—informed redundancy planning with alternative routes including China-US Cable Network and NCP (network) style diversions. Maintenance logs are coordinated through subsea repair contractors and international marine salvage frameworks such as those used in repairs to FLAG and SEA-ME-WE systems.

Category:Submarine communications cables in the Pacific Ocean Category:Submarine communications cables in the South China Sea