English 
Русский 
简体中文 
Español 
Deutsch 
Français 
Português 
Italiano 
日本語 
한국어 
Türkçe 
Polski 
Nederlands 
العربية 
हिन्दी 
Bahasa Indonesia 
Tiếng Việt 
ไทย 
বাংলা 
اردو 
Kiswahili 
Oʻzbekcha 
አማርኛ 
فارسی 
繁體中文 
Bahasa Melayu SFP28
Đội ngũ của chúng tôi đang thực hiện bản dịch. Bài viết này tạm thời chưa có bản tiếng Việt và đang được hiển thị bằng tiếng Anh.
SFP28 carries a single 25 Gb/s lane in the SFP footprint. It emerged from the 100GbE work — one lane of a 4×25G QSFP28 — and made 25GbE the natural server uplink, replacing 10G at nearly the same cost per port.
Key facts
| Lanes × rate | 1 × 25.78 Gb/s (NRZ) |
| Total | 25G |
| Connector | LC duplex; SFP28 DAC/AOC |
| Supply | 3.3 V |
| Applications | 25GBASE-SR/LR/ER (IEEE 802.3by), 32GFC, server-to-leaf links |
Specifications
- SFF-8402 — SFP+ 1X 28 Gb/s Pluggable Transceiver Solution (SFP28): the mechanical and electrical definition of SFP28.
- SFF-8432 — Module and Cage (shared with SFP+).
- SFF-8472 — Management Interface.
- IEEE 802.3by — the 25GbE PHY and the 25GAUI electrical interface.
Management interface
Two-address SFF-8472 as with SFP+ (A0h identity, A2h diagnostics), with 25G rate and interface codes from SFF-8024. Forward error correction options (no FEC / BASE-R / RS-FEC) matter at 25G: a mismatch between host and module settings is a classic cause of a link that will not come up.
Compatibility notes
- Backward compatible: an SFP28 port accepts SFP+ and SFP modules at their own rates.
- Four SFP28 links are the breakout of one QSFP28 port (4×25G) — see QSFP28.
In CodingBox
Fully supported per SFF-8472 — identity, DDM with thresholds, editing and writing with checksum recalculation. SFP28 identity fields are decoded with the 25G codes so the Check transceiver screen reports the correct interface.