Introduction to SFF Transceivers
2017-10-05
What is SFF Transceiver?
SFF (Small Form Factor) is welded small package optical transceiver usually with 2×5 or 2×10 pinout, with the general speed of less than 1250Mbps and using LC interface. Small Form Factor (SFF) Transceiver Multi-source Agreement (MSA) was established by defines the package outline, circuit board layout, and pin function definition.SFF small package optical transceiver adopts advanced precision optics and integrated circuit process, those make it is 25% smaller than SFP cage assemblies, 30% smaller than traditional 1×9 transceivers or 70% smaller than GBIC optics.The SFF package allows designers of Gigabit Ethernet networking equipment to maximize their use of available board space.
Figure 1 SFP+ Typical SFF 2×5 Transceiver
Types of SFF Transceiver
| Transceivers | Types |
| Data Rate | 155Mbps SFF,622Mbps SFF,1250Mbps SFF,2488Mbps SFF,4250Mbps SFF |
| Operation Temperature | Standard SFF,Industrial SFF |
| Others | CWDM SFF,BIDI SFF,Duplex SFF |
The difference between SFF, GBIC, 1×9 and SFP
| Transceivers | Mechanical Dimension | Data Rate | Connector | Pinout | Support Hot Pluggable | MSA Compliant |
| 1×9 | Medium | 0.5Mb,2Mb,155Mb,622Mb,1.25Gb,2.5Gb | SC,FC,ST or Pigtail | 9 Pin | NO | NA |
| SFF | Smallest | 155Mb,622Mb,1.25Gb,2.5Gb,4.25Gb | LC,SC | 2×5 Pin,2×10 Pin | No | SFF MSA |
| GBIC | Biggest | 155Mb,622Mb,1.25Gb | SC | 20 Pin | No | GBIC MSA |
| SFP | Medium | 155Mb,622Mb,1.25Gb,2.5Gb,4.25Gb,6Gb | LC | 20 Pin | Yes | SFP MSA |
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