LG U+ FOSC Case Study: 48,000+ Dome Splice Closures Deployed | GLORY Optics

Introduction: When Standards-Driven Operators Choose GLORY

In the competitive world of fiber optic outside-plant infrastructure, earning a place on the approved vendor list of a Tier-1 telecom operator is one of the most demanding achievements a manufacturer can pursue. When that operator is LG U+-one of South Korea's three national carriers and a global pioneer in 5G deployment-the bar rises even higher.

Since 2019, GLORY Optical Communication has been the exclusive supplier of dome-type fiber optic splice closures (FOSC) for LG U+'s FTTH distribution network. With more than 48,000 units deployed across all three capacity tiers-small (24f–144f), medium (48f–288f), and large (72f–576f)-this partnership represents the first time a Chinese-manufactured FOSC product was selected exclusively by a South Korean Tier-1 operator at this scale.

This article unpacks the technical, commercial, and strategic dimensions of this deployment-and what it reveals about why dome-type splice closures remain the preferred choice for demanding FTTH rollouts.

1. Customer Profile: LG U+ at a Glance

LG U+ (LG Uplus Corp.) was established on July 11, 1996 and has grown to become one of South Korea's top three telecommunications operators, alongside SK Telecom and KT Corporation. The company holds approximately 19.5% of the national mobile market.

LG U+ has a track record of network firsts. It was the first operator globally to deploy a nationwide LTE network, and by Q3 2020, it had become the fastest-growing 5G operator in South Korea. By Q1 2025, LG U+'s 5G subscriber base reached approximately 10.5 million, representing roughly 78% of its core mobile subscribers.

On the fixed broadband side, LG U+ operates one of Korea's most extensive fiber-to-the-home networks. South Korea leads the world in fiber broadband penetration, with nearly 89% of all fixed broadband connections delivered over fiber optic infrastructure. This creates an operating environment where splice closure quality, sealing reliability, and re-entry capability are not theoretical requirements-they are day-one operational necessities.

2. The Opportunity: LG U+ Biennial FOSC Tender

LG U+ conducts competitive tenders for its FOSC product lines approximately every two years. These tenders are technically demanding: products must comply with Telcordia GR-771-CORE and ITU-T L.96 standards, and must pass a full suite of proprietary qualification tests covering environmental sealing, mechanical endurance, fiber management, and re-entry performance.

The tender that GLORY won covered the complete FOSC deployment hierarchy for LG U+'s FTTH network:

Total deployed volume: 48,000+ dome-type FOSC units across FTTH distribution nodes, feeder cable splice points, and backbone terminations.

This deployment marked a milestone: it was the first time FOSC products from a Chinese manufacturer were supplied exclusively to a South Korean Tier-1 operator, clearing LG U+'s full qualification process.

3. Why LG U+ Selected Dome-Type Closures

The decision to standardize on dome-type closures across all three capacity tiers reflects the technical advantages that dome designs offer in FTTH deployment at scale.

4. How GLORY Won the Contract

Competing for a Tier-1 operator contract in South Korea requires more than competitive pricing. GLORY's success in the LG U+ tender was built on four pillars:

5. Deployment Results and Field Performance

The deployment covers the complete FTTH optical distribution network hierarchy: backbone termination points use large-capacity (72f–576f) dome closures, feeder cable splice points use medium-capacity (48f–288f) units, and last-mile distribution nodes-where the highest volume is concentrated-use small-capacity (24f–144f) closures.

This full-hierarchy deployment demonstrates that dome-type closures are not specialized for a single application. When engineered correctly, a single product family can serve every splice point in an FTTH network-from trunk-level backbone to subscriber-facing distribution.

6. Beyond Korea: GLORY's Global FOSC Deployment Track Record

The LG U+ project is one of several landmark deployments that demonstrate GLORY's capability to serve demanding operators across different markets and regulatory environments.

Open Fiber - Italy

Open Fiber is a wholesale fiber network provider building Italy's national FTTH infrastructure. As of late 2024, Open Fiber had passed over 14.5 million property units with FTTH connectivity, making it the largest FTTH operator in Italy and among the market leaders in Europe.

GLORY has been supplying customized ODN products to Open Fiber since 2015, including fiber crossing cabinets (30,000+ delivered), fiber splice closures (8,000+ delivered), and fiber distribution boxes (80,000+ delivered). The partnership was built on GLORY's ability to meet European regulatory requirements while providing rapid customization turnaround for Open Fiber's specific deployment architecture.

Converge ICT - Philippines

Converge ICT Solutions is the Philippines' fastest-growing pure-fiber broadband provider, operating over 710,000 km of fiber optic infrastructure across Luzon, Visayas, and Mindanao. The company reached approximately 2.93 million residential subscribers by September 2025 and plans to expand to 11 million fiber ports by 2027.

Converge selected GLORY as an ODN shortlist supplier based on product quality and OEM customization capability. GLORY has developed customized fiber distribution boxes, splice closures, and terminal boxes for Converge's deployment architecture, with new product customization projects ongoing.

7. Market Context: Why FOSC Quality Matters More Than Ever

The global fiber optic connectivity market was valued at USD 3.3 billion in 2024 and is estimated to grow at a CAGR of 9.3% through 2034. FTTx networks represent the largest application segment at 31% market share, driven by 5G backhaul requirements, government broadband initiatives, and accelerating FTTH deployment worldwide.

In this growth environment, splice closure quality is not a commodity decision. A closure failure at a distribution node affects every subscriber downstream. The cost of a single truck roll to diagnose and repair a failed closure-typically USD 300–600 in loaded labor costs-can exceed the cost of the closure itself by 20x or more.

Operators like LG U+, Open Fiber, and Converge ICT choose GLORY because the total cost of ownership equation favors quality: products that pass rigorous qualification testing, maintain IP68 sealing integrity over decades, and enable re-entry without replacement deliver measurable savings at network scale.

8. GLORY Dome-Type FOSC Product Overview

9. Conclusion: Proven at Scale, Ready for Your Network

The LG U+ deployment is not simply a sales milestone-it is a performance benchmark. 48,000+ dome-type splice closures operating across South Korea's most demanding FTTH network, in one of the world's most advanced fiber markets, for over six years without batch-level quality failure.

For network planners, procurement teams, and system integrators evaluating fiber optic splice closures for FTTH, 5G backhaul, or enterprise fiber projects, the GLORY dome-type FOSC product line offers a proven combination of standards compliance, field reliability, and total cost of ownership advantage.