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Fiber optic interface types of aggregation switches

Fibre interconnection and data room reference Published 05 Feb 2026

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

Aggregation switches typically use SFP, SFP+, QSFP+, and QSFP28 fiber interfaces to connect access switches and core switches, supporting speeds from 1G to 100G over single-mode or multi-mode fiber.

Overview of Aggregation Switch Fiber Interfaces

Aggregation switches sit between access and core layers, consolidating traffic from multiple access switches. The fiber interfaces on these switches are chosen based on bandwidth requirements, distance, and network topology. Common interface types include: SFP (Small Form-factor Pluggable): Supports 1G connections, suitable for short to medium distances.

Often used for uplinks from access switches in campus networks. SFP+: Supports 10G connections, widely used for high-bandwidth downlinks to access switches or uplinks to the core. Compatible with both single-mode (10GBASE-LR/ER) and multi-mode (10GBASE-SR) fiber.

QSFP+: Supports 40G connections, ideal for high-density aggregation scenarios or data center environments where multiple 10G links are combined. QSFP28: Supports 100G connections, typically used for uplinks to core switches or interconnecting aggregation blocks in large-scale networks. Connector TypesLC Duplex: Most common for SFP/SFP+ modules, compact and suitable for high-density patch panels.

S

C: Larger, often found in legacy equipment, less common in modern aggregation switches. MPO/MTP: Used for QSFP/QSFP28 modules in high-density or data center aggregation deployments.

Single-

Mode vs Multi-Mode FiberSingle-mode fiber (SMF): Recommended for long-distance connections (up to 10 km or more with 10GBASE-LR, 40GBASE-LR4, or 100GBASE-LR4) between aggregation and core switches. Multi-mode fiber (MMF): Suitable for shorter distances (up to 300 m for 10GBASE-SR), often used within buildings or campus floors.

Port Density and Uplink Considerations

Aggregation switches typically feature: 24–48 downlink ports (1G or 10G) connecting to access switches. 4–8 uplink ports (40G or 100G) connecting to the core layer or other aggregation blocks. Support for Link Aggregation (LACP) to combine multiple fiber links into a single logical connection for higher bandwidth and redundancy.

Summary

When selecting fiber interfaces for aggregation switches: Match port type and speed to access and core switch requirements.

Use L

C duplex SFP/SFP+ modules for most 1G/10G connections. Use QSFP+/QSFP28 modules for high-density 40G/100G uplinks. Choose single-mode fiber for long distances and multi-mode fiber for short distances.

Ensure redundancy and link aggregation for reliability and scalability. This approach ensures efficient, high-performance, and scalable fiber optic connectivity in aggregation layers.

Fiber optic interface types of aggregation switches - FD SOLUCIONES OPTICAL SYSTEMS [PDF]

Fiber optic interface types of aggregation switches
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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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