SFF
Overview: SFF (Small Form Factor) Optical Transceivers are compact, pluggable modules designed for reliable data transmission up to 2.5 Gbps over multimode or single‑mode fiber. Defined by the SFF MSA (Multi‑Source Agreement), these modules are smaller than GBIC and provide dual‑channel connectivity via LC, MT‑RJ, or VF‑45 connectors. SFF transceivers are widely used in Fast Ethernet, Fibre Channel, and SONET applications where board density and low power are critical.
Technical Specifications
- Data Rate: From 100 Mbps to 2.5 Gbps
- Typical Reach: 550 m (MMF) to 80 km (SMF)
- Wavelength Options: 850 nm, 1310 nm, 1550 nm
- Connector Type: LC duplex / MT‑RJ / VF‑45
- Fiber Type: Multimode and Single‑mode
- Power Consumption: ≤ 1.5 W
- Form Factor Size: Half the size of legacy GBIC modules
- Standards Compliance: SFF MSA, IEEE 802.3u / 802.3z, SONET OC‑3/OC‑12, RoHS
Key Features
- Hot‑pluggable SFF form factor with low power consumption
- Supports Fast Ethernet, Fibre Channel, and SONET protocols
- Dual TX/RX channels with LC or MT‑RJ interfaces
- Optional Digital Diagnostics Monitoring (DDM/DOM)
- Industrial temperature versions for rugged environments
- Backward compatibility with SFP electrical interfaces on some systems
- Reliable EMI performance and compact PCB‑mount design
- Available in multiple optical types: SX, LX, EX, and ZX
Applications
- Metro and enterprise optical networks
- Fast Ethernet and 2G Fibre Channel interfaces
- Telecom SONET / SDH OC‑3 (155 Mbps) to OC‑48 (2.5 Gbps)
- Media converters and switch uplink ports
- Legacy industrial control and network equipment
Related Keywords: SFF transceiver module, SFF optical transceiver datasheet, 2G Fibre Channel SFF, SFF MSA transceiver, Fast Ethernet optical module, SFF LC duplex optics.
FAQ – SFF Optical Transceivers
1. What is an SFF optical transceiver?
An SFF transceiver is a Small Form Factor optical module used for data rates up to 2.5 Gbps in Ethernet, Fibre Channel, and SONET applications.
2. How does SFF differ from SFP?
SFF modules are slightly larger and commonly board‑mounted via pins rather than cages and latches like SFP. SFP is hot‑swappable; SFF often requires system power down for replacement.
3. What connectors do SFF modules use?
Typical SFF interfaces include LC duplex, MT‑RJ, and VF‑45 connectors depending on model type.
4. What data rates do SFF transceivers support?
They cover speeds from 100 Mbps Fast Ethernet to 2.5 Gbps Fibre Channel or SONET OC‑48 applications.
5. Do SFF modules support Digital Diagnostics Monitoring?
Some modern SFF modules include DDM/DOM functions for monitoring temperature and optical power levels.
6. Are SFF and SFP interchangeable?
No, they use different mechanical connections and board interfaces, though some hybrid devices may support both form factors.
7. Where are SFF modules still used today?
SFF optics remain common in industrial controllers, legacy telecom gear, and compact data switches with low fiber port counts.
8. What standards define SFF transceivers?
SFF modules follow the SFF MSA, IEEE 802.3u / 802.3z Ethernet standards, and SONET OC‑3 to OC‑48 optical interface requirements.