010-151 · Question #132
Which transceiver can support 400 Gigabit Ethernet?
The correct answer is A. QSFP-DD. QSFP-DD uses 8 electrical lanes at 50 Gbps each to achieve 400 Gigabit Ethernet, making it the only transceiver listed capable of this speed.
Question
Which transceiver can support 400 Gigabit Ethernet?
Options
- AQSFP-DD
- BQSFP+
- CQSFP28
- DSFP-DD
How the community answered
(35 responses)- A83% (29)
- B3% (1)
- C6% (2)
- D9% (3)
Why each option
QSFP-DD uses 8 electrical lanes at 50 Gbps each to achieve 400 Gigabit Ethernet, making it the only transceiver listed capable of this speed.
QSFP-DD (Quad Small Form Factor Pluggable Double Density) achieves 400GbE by using 8 x 50 Gbps PAM4 electrical lanes, doubling the lane count of standard QSFP designs. Its double-density architecture provides 400 Gbps aggregate throughput while maintaining backward compatibility with the standard QSFP form factor. This makes it the designated transceiver standard for 400 Gigabit Ethernet interfaces.
QSFP+ supports a maximum of 40GbE using 4 lanes at 10 Gbps each, which is far below the 400 Gbps requirement.
QSFP28 supports up to 100GbE using 4 lanes at 25 Gbps each, providing only one-quarter of the bandwidth needed for 400GbE.
SFP-DD uses 2 lanes at up to 50 Gbps each for a maximum of 100GbE, which does not meet the 400 Gbps threshold.
Concept tested: QSFP-DD transceiver support for 400GbE
Source: https://www.cisco.com/c/en/us/products/interfaces-modules/400g-qsfp-dd-optical-transceiver/index.html
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