Side-by-Side Comparison
Optical Transceivers
QSFP28 vs. SFP+
Comparing 2 standards across 13 specifications. 13 key differences identified.
Comparing:
QSFP28
SFP+
QSFP28 (Quad Small Form-Factor Pluggable 28) is a 100 Gbps transceiver standard defined by SFF-8665 and IEEE 802.3bm. Integrating four 25 Gbps electrical lanes within the exact QSFP mechanical dimensions, it is the primary high-density interconnect for 100 Gigabit Ethernet and EDR InfiniBand.
Enhanced Small Form-Factor Pluggable (SFP+) is a standardized 10 Gbps transceiver form factor defined by SFF-8431 and SFF-8432. Retaining the physical dimensions of standard SFP, it supports 10 Gigabit Ethernet (10GbE), 8G/16G Fibre Channel, and OTU2 over a single 10.3125 Gbps serial electrical lane.
Specification Comparison Table
13 Parameters| Parameter / Spec | ||
|---|---|---|
|
Standard / MSA
|
SFF-8665 / SFF-8636 / IEEE 802.3bm | SFF-8431 / SFF-8432 |
|
Physical Form Factor
|
QSFP28 | SFP+ (Enhanced SFP) |
|
Electrical Channels
|
4 lanes @ 25.78125 Gbps NRZ | 1-lane (10.3125 Gbps NRZ) |
|
Max Data Rate (Ethernet)
|
103.125 Gbps | 10.3125 Gbps |
|
Max Data Rate (InfiniBand)
|
100 Gbps (EDR) | — |
|
Optical Connectors
|
MPO/MTP-12 (SR4, PSM4) or Duplex LC (CWDM4, LR4) | — |
|
4x25G Breakout Mode
|
Supported (to 4x SFP28 ports) | — |
|
Typical Power Consumption
|
3.5–5.0 W | — |
|
Max Data Rate (Fibre Channel)
|
— | 16 Gbps |
|
Optical Connector
|
— | Duplex LC |
|
Direct Attach Copper (DAC)
|
— | Supported (Twinax up to 7m passive) |
|
Digital Optical Monitoring (DOM)
|
— | SFF-8472 standard |
|
Backward Compatibility
|
— | Accepts 1G SFP in dual-rate ports |