Side-by-Side Comparison
Optical Transceivers
QSFP+ vs. QSFP28
Comparing 2 standards across 9 specifications. 9 key differences identified.
Comparing:
QSFP+
QSFP28
Quad Small Form-Factor Pluggable Plus (QSFP+) is a 40 Gbps transceiver standard defined by SFF-8436. Integrating four 10 Gbps electrical channels into a compact form factor, it supports 40 Gigabit Ethernet (40GbE), InfiniBand QDR/FDR, and 4x10G breakout configurations using MPO/MTP-12 or duplex LC connectors.
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.
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Standard / MSA
|
SFF-8436 / IEEE 802.3ba | SFF-8665 / SFF-8636 / IEEE 802.3bm |
|
Physical Form Factor
|
QSFP+ (Quad SFP+) | QSFP28 |
|
Electrical Channels
|
4 lanes @ 10.3125 Gbps NRZ | 4 lanes @ 25.78125 Gbps NRZ |
|
Max Data Rate (Ethernet)
|
41.25 Gbps | 103.125 Gbps |
|
Max Data Rate (InfiniBand)
|
56 Gbps (FDR) | 100 Gbps (EDR) |
|
Optical Connectors
|
MPO/MTP-12 (SR4) or Duplex LC (LR4 / BiDi) | MPO/MTP-12 (SR4, PSM4) or Duplex LC (CWDM4, LR4) |
|
Typical Power Consumption
|
1.5–3.5 W | 3.5–5.0 W |
|
4x10G Breakout Mode
|
Supported (1x MPO to 4x duplex LC) | — |
|
4x25G Breakout Mode
|
— | Supported (to 4x SFP28 ports) |