400G QSFP-DD SR4 | Transceivers

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Dell 400GQ56DD-VR4 Compatible 400GBASE-SR4 QSFP-DD PAM4 850nm 100m DOM MPO-12/APC MMF Ethernet Optical Transceiver Module

P/N: QDD-400G-SR4

$429.00

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4-Year Warranty

30-Day Returns

30-Day Exchange

（1 In Stock）

Product Highlights

Built-in Maxlinear Chip, Max. Power Consumption 8W

Tested in Targeted Switches for Superior Performance, Quality, and Reliability

Compliant with QSFP-DD MSA, CMIS Rev5.2

Hot Pluggable QSFP-DD Form Factor

High-speed Electrical Compliant to IEEE802.3bs

8x 50G PAM4 Retimed 400GAUI-8 Electrical Interface

QSFP-DD Port is Backward Compatible with QSFP+, QSFP28 and QSFP56 Modules

Specifications

Certification

Connectivity Solutions

Comparison Table

Q&A

Reviews

Resources

Dell 400GQ56DD-VR4 Compatible 400GBASE-SR4 QSFP-DD PAM4 850nm 100m DOM MPO-12/APC MMF Ethernet Optical Transceiver Module

The 400GBASE-SR4 module, MTP/MPO-12 connector, up to 100m over parallel OM4 multi-mode fiber. It is compliant to IEEE 802.3bs protocol and 400GAUI-8 standard.The 400 Gigabit Ethernet signal is carried over four parallel lanes by one wavelength per lane. It can support 2 x 200G-SR and 4 x 100G-SR.

Specifications

Form Factor

QSFP-DD

Data Rate

425Gbps

Media

MMF

Wavelength

850nm

Connector

MTP/MPO-12 APC

Distance

30m@OM3 50m@OM4

Transmitter Type

VCSEL

Receiver Type

Electrical Modulation

8x 53.125G PAM4

Optical Modulation

4x 106.25 PAM4

Power Consumption

≤9.0W

Case Operating Temperature

0 to 70°C (32 to 158°F)

Protocol

400 Gigabit Ethernet

Application

Swicth to Switch Switch to NIC Other Optical Links

Certification

Connectivity Solutions

Dell Switch links：400G QSFP-DD to 400G QSFP-DD

All

Comparison Table

	QDD-400G-SR8	QDD-400G-FR4	QDD-400G-SR4	QDD-400G-DR4
Form Factor	QSFP-DD	QSFP-DD	QSFP-DD	QSFP-DD
Data Rate	425Gbps	425Gbps	425Gbps	425Gbps
Media	MMF	SMF	MMF	SMF
Wavelength	850nm	1264.5~1277.5nm@Lane 0 1284.5~1297.5nm@Lane 1 1304.5~1317.5nm@Lane 2 1324.5~1337.5nm@Lane 3	850nm	1310nm
Connector	MTP/MPO-16 APC	Duplex LC UPC	MTP/MPO-12 APC	MTP/MPO-12 APC
Distance	70m@OM3 100m@OM4	2km	30m@OM3 50m@OM4	500m
Transmitter Type	VCSEL	EML	VCSEL	EML
Receiver Type	PIN	PIN	PIN	PIN
Electrical Modulation	8x 53.125G PAM4	8x 53.125G PAM4	8x 53.125G PAM4	8x 53.125G PAM4
Optical Modulation	8x 53.125G PAM4	4x 106.25 PAM4	4x 106.25 PAM4	4x 106.25 PAM4
Power Consumption	≤10.0W	≤9.0W	≤9.0W	≤9.0W
Case Operating Temperature	0 to 70°C (32 to 158°F)	0 to 70°C (32 to 158°F)	0 to 70°C (32 to 158°F)	0 to 70°C (32 to 158°F)
Protocol	400 Gigabit Ethernet 2x 200G Breakout Ethernet 4x 100G Breakout Ethernet	400 Gigabit Ethernet	400 Gigabit Ethernet	400 Gigabit Ethernet 4x 100G Breakout Ethernet
Application	Swicth to Switch Switch to NIC Other Optical Links	Swicth to Switch Other Optical Links	Swicth to Switch Switch to NIC Other Optical Links	Swicth to Switch Switch to NIC Other Optical Links

Form Factor

Data Rate

Media

Wavelength

Connector

Distance

Transmitter Type

Receiver Type

Electrical Modulation

Optical Modulation

Power Consumption

Case Operating Temperature

Protocol

Application

Cisco Compatible 400G QSFP-DD SR8 100m 850nm MPO-16/APC MMF Transceiver Module

QSFP-DD

425Gbps

MMF

SMF

MMF

SMF

850nm

1264.5~1277.5nm@Lane 0 1284.5~1297.5nm@Lane 1 1304.5~1317.5nm@Lane 2 1324.5~1337.5nm@Lane 3

850nm

1310nm

MTP/MPO-16 APC

Duplex LC UPC

MTP/MPO-12 APC

70m@OM3 100m@OM4

2km

30m@OM3 50m@OM4

500m

VCSEL

EML

VCSEL

EML

8x 53.125G PAM4

4x 106.25 PAM4

≤10.0W

≤9.0W

0 to 70°C (32 to 158°F)

400 Gigabit Ethernet 2x 200G Breakout Ethernet 4x 100G Breakout Ethernet

400 Gigabit Ethernet

400 Gigabit Ethernet 4x 100G Breakout Ethernet

Swicth to Switch Switch to NIC Other Optical Links

Swicth to Switch Other Optical Links

Swicth to Switch Switch to NIC Other Optical Links

Questions & Answers

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All (5) Application (1)Product (1)Compatibility (2)Performance (1)

What is the average power consumption of this transceiver?

by e***m on 2025-08-27 07:22:57

The average power consumption varies by model, but it typically ranges between 3W to 12W.

by AICPLIGHT on 2025-08-27 10:40:18

Helpful 0

What’s the typical BER (Bit Error Rate)?

by P***m on 2025-03-14 03:11:02

Typical BER is under normal operation.

by AICPLIGHT on 2025-03-14 06:30:15

Helpful 0

Can I use this module in AI training environments?

by D***m on 2024-12-28 04:50:48

Yes, our IB and high-speed Ethernet modules are suitable for AI workloads.

by AICPLIGHT on 2024-12-28 19:30:42

Helpful 0

Is this product compatible with NVIDIA/Infiniband switches?

by r***m on 2024-12-18 18:29:59

Yes, our IB modules are fully compatible with NVIDIA switches.

by AICPLIGHT on 2024-12-19 12:19:42

Helpful 0

Do I need to configure anything before installation?

by q***m on 2024-12-12 00:23:42

No major configuration is required; most modules are plug-and-play.

by AICPLIGHT on 2024-12-12 20:07:55

Helpful 0

Customer Reviews

Write a review

All (12) Performance (3)Compatibility (2)Ease of Use (4)Customer Support (3)

d***m

2025-07-02 12:09:58

Confirmed Purchase

5.0

Ideal for large-scale cloud and DCI applications—maintains excellent performance across long-haul distances.

Helpful 0

Y***m

2025-06-20 21:54:52

Confirmed Purchase

5.0

The signal quality remains intact even at extended range over single-mode fiber.

Helpful 0

7***m

2025-06-15 06:07:31

Confirmed Purchase

5.0

The plug-and-play functionality helped speed up our Ethernet DCI rollout significantly.

Helpful 0

g***m

2025-05-12 01:29:40

Confirmed Purchase

5.0

Fully interoperable with Arista, Dell, and white-box switches in our lab.

Helpful 0

R***m

2025-05-07 22:48:10

Confirmed Purchase

5.0

These modules were pre-programmed and ready to install out of the box—zero configuration needed.

Helpful 0

5***m

2025-04-30 00:33:14

Confirmed Purchase

5.0

After deployment, support followed up to ensure the modules had passed our internal benchmarks.

Helpful 0

o***m

2025-04-22 20:14:06

Confirmed Purchase

5.0

The latch design makes removal and re-insertion quick even in tight spaces.

Helpful 0

b***m

2025-04-20 06:20:48

Confirmed Purchase

5.0

The pre-sales consultation was detailed and tailored to our specific data center needs. Very professional experience.

Helpful 0

x***m

2025-04-16 15:48:21

Confirmed Purchase

5.0

Technical support provided clear guidance on 800G-to-2x400G breakouts for our aggregation layer.

Helpful 0

C***m

2025-04-15 10:11:25

Confirmed Purchase

5.0

These modules were pre-programmed and ready to install out of the box—zero configuration needed.

Helpful 0

Y***m

2025-04-08 03:34:34

Confirmed Purchase

5.0

These Ethernet modules run flawlessly under sustained 800G load, with consistent throughput and thermal stability.

Helpful 0

x***m

2025-04-04 13:40:02

Confirmed Purchase

5.0

Recognized immediately by our monitoring system—no configuration needed.

Helpful 0

Resources

QDD-400G-SR4 Datasheet

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