Recent Updates

• January 29, 2026
  TLV672x device is added to the references, under Other Documents section.
• November 23, 2025
  OSFP-XD MSA Rev 1.11 Specification for OSFP-XD Octal Small Form Factor eXtra Dense Pluggable Module is posed in the specification section of the website, to correct the figure 4-11 in the OSFP-XD MSA Rev 1.1. and a disclaimer is added to the Other Documents section.
• August 14, 2025
  OSFP MSA Revision 5.22: Specification for OSFP Octal Small Form Factor Pluggable Module is posted in the specification section of the website, to correct the Figure 12-8 in the OSFP MSA Rev 5.2 or 5.21.
• May 08, 2025
  OSFP MSA Revision 5.21: Specification for OSFP Octal Small Form Factor Pluggable Module, is posted in the specification section of this website.

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Frequently Asked Questions

Q: What is the OSFP (Octal Small Form Factor Pluggable)?

A: The OSFP is a pluggable form factor with 8x high speed electrical lanes that support up to 400 Gbps (8x50G), 800 Gbps (8x100G), or 1.6 Tbps (8x200G). Up to 36 OSFP ports are supported in 1 U front panel.

Q: What are the variants of the OSFP form factors?

A: The standard OSFP form factor has an integrated heatsink for improved thermal performance. The heatsink can be either open top or closed top. Meanwhile, OSFP-RHS provides same electrical performance but does not have integrated heatsink. As such, a separate cooling solution in the form of a riding heatsink (RHS) is required and allows for greater versatility. Refer to the OSFP specification for the further details.

Q: What is the OSFP-XD (Octal Small Form Factor Pluggable – Extended Density)?

A: The OSFP-XD is a pluggable form factor with 16x high speed electrical lanes, doubling the faceplate density versus OSFP. Hence, it supports up to 800 Gbps (16x50G), 1.6 Tbps (16x100G), or 3.2 Tbps (8x200G). The OSFP-XD specification is a separate document.

Q: Are OSFP and OSFP-XD Interoperable/Cross-compatible?

A: No, due to mechanical and electrical differences, OSFP modules are not compatible with OSFP-XD ports, and vice-versa. Mechanical keying features on the modules prevents insertion into the wrong port type.

Q: What does the OSFP MSA do?

A: The OSFP MSA defines the OSFP and OSFP-XD specifications, including the mechanical module, the card cage, the electrical interface and pinout.