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Why are 10 Gigabit optical modules not listed as SC

Fiber and communications infrastructure knowledge brief Published 23 Oct 2026

Use this reference to prepare product questions for CJC FIBRE. Check interfaces, capacity, protection and installation requirements against the current product documentation.

Modern 10 Gigabit optical modules rarely use SC connectors due to size, cost, and power efficiency considerations, with LC connectors becoming the standard for SFP+ modules.

Historical Context

Early 10GbE optical transceivers, such as XENPAK and X2 modules, did use SC connectors.

XENPA

K modules were the first generation of 10G Ethernet transceivers with SC interfaces, but they were large, power-hungry, and expensive. X2 modules reduced the size by half compared to XENPAK but still retained SC interfaces in some cases, making them transitional products.

GBI

C modules, used for Gigabit Ethernet, also featured SC connectors, but these were gradually replaced by smaller SFP modules.

Technical and Practical Reasons

Size Constraints: Modern 10GbE SFP+ modules are much smaller than XENPAK or X2, and SC connectors are physically larger than LC connectors.

L

C connectors allow higher port density on switches and servers, which is critical in data centers. Power Consumption: SC-based XENPAK modules consume more power due to their larger internal circuitry. SFP+ modules with LC connectors are more energy-efficient, which is important for high-density deployments.

Cost and Market Trends: LC connectors are cheaper and easier to handle in high-density environments. The market has largely standardized on LC for short-reach multimode (10GBASE-SR) and single-mode (10GBASE-LR) optics, making SC connectors less common. Deployment Flexibility: LC connectors support duplex fiber connections in a compact form factor, which aligns with modern network cabling practices.

S

C connectors, being bulkier, are less suitable for dense patch panels and high-performance computing environments.

Summary

While S

C connectors were used in early 10GbE modules like XENPAK and X2, modern 10GbE SFP+ modules almost exclusively use LC connectors due to their smaller size, lower power consumption, cost efficiency, and suitability for high-density network deployments.

S

C connectors are now mostly found in legacy or specialized BIDI modules, but they are no longer standard for mainstream 10GbE optics.

Why are 10 Gigabit optical modules not listed as SC - CJC FIBRE CONSULTANTS [PDF]

Why are 10 Gigabit optical modules not listed as SC

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Technical note

This reference is intended for preliminary fiber and communications infrastructure research. Optical interface, fiber type, port or core capacity, electrical input and output, enclosure protection, cooling, installation limits and applicable standards must be verified for the specific project.

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