QDD-400-CU3M – 400G QSFP-DD DAC – 3m Passive Copper – Direct Link
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QDD-400-CU3M Description
QDD-400-CU3M is a Cisco 400G QSFP-DD passive copper direct-attach cable for short 3-meter links between supported Cisco QSFP-DD 400G ports.
The current SKU stays in the QDD-400-CUxM direct-link copper family, not the QDD-4ZQ100-CU3M breakout cable family. Cisco lists QDD-400-CU3M as a QSFP-DD-to-QSFP-DD passive copper assembly, while the breakout 3-meter copper option fans one QSFP-DD end out to four QSFP56 100GBASE-CR2 endpoints.
Order review should tie QDD-400-CU3M to the measured rack path, the exact 3-meter length, the 400G QSFP-DD host ports, and the Cisco compatibility result. Keep it separate from shorter QDD-400-CU entries, 3-meter active optical cables, and QSFP-DD breakout cables before price, stock, warranty, or shipping terms are finalized.
Quick Specs
|
Parameter |
Specification |
|---|---|
|
Product ID |
QDD-400-CU3M |
|
Brand |
Cisco |
|
Product family |
Cisco 400G QSFP-DD modules |
|
Product type |
400G QSFP-DD passive copper cable |
|
Cable assembly type |
Passive copper direct-attach cable assembly |
|
Connector form |
QSFP-DD to QSFP-DD |
|
Ethernet rate |
400 Gigabit Ethernet |
|
Cable length |
3 meters |
|
Pull tab color |
Orange |
|
Maximum power consumption |
1.5W per end |
|
Module weight |
600 g maximum |
|
Operating temperature class |
Copper cable operation 0 to 70 degrees C |
|
Compatibility reference |
Cisco Transceiver Module Group Compatibility Matrix |
Application Scenarios
QDD-400-CU3M fits short 400G QSFP-DD copper paths where both endpoint ports are Cisco-supported QSFP-DD 400G ports and the measured route needs the 3-meter member of the QDD-400-CUxM family.
Cisco IOS XE 17.13.x release notes list QDD-400-CU3M among Cisco 400G QSFP-DD module product numbers supported on the C9600X-LC-32CD line card, so Catalyst orders should still be checked against the exact line card, release, and TMG entry.
Cisco UCS 6652 hardware documentation lists QDD-400-CU3M as 400G Passive Cable, 3m under QSFP-DD uplink-only 400GbE media, and a Cisco AI POD design includes QDD-400-CU3M in a Nexus 9332D-GX2B or Nexus 9364D-GX2A fabric context.
Product Comparison
|
Parameter |
QDD-400-CU3M |
QDD-400-CU2.5M |
QDD-4ZQ100-CU3M |
QDD-400-AOC3M |
|---|---|---|---|---|
|
Product family |
Cisco 400G QSFP-DD modules |
Cisco 400G QSFP-DD modules |
Cisco 400G QSFP-DD modules |
Cisco 400G QSFP-DD modules |
|
Product type |
400G QSFP-DD passive copper cable |
400G QSFP-DD passive copper cable |
QSFP-DD to 4x QSFP56 100GBASE-CR2 passive breakout copper cable |
400G QSFP-DD active optical cable |
|
Cable assembly type |
Passive copper cable assembly |
Passive copper cable assembly |
Passive copper breakout cable assembly |
Active optical cable assembly |
|
Endpoint connector layout |
QSFP-DD to QSFP-DD |
QSFP-DD to QSFP-DD |
QSFP-DD to 4x QSFP56 |
QSFP-DD to QSFP-DD |
|
Ethernet role |
400G direct link |
400G direct link |
4x 100GE breakout link |
400G direct link |
|
Cable length |
3 meters |
2.5 meters |
3 meters |
3 meters |
|
Pull tab color |
Orange |
Yellow |
Orange |
Orange |
|
Maximum power consumption |
1.5W per end |
1.5W per end |
1.5W per end |
12W per end |
|
Module weight |
600 g maximum |
550 g maximum |
800 g maximum |
190 g maximum |
|
Operating temperature |
0 to 70 degrees C for copper cable |
0 to 70 degrees C for copper cable |
0 to 70 degrees C for copper cable |
0 to 70 degrees C for active optical cable |
|
Ordering description |
400G QSFP-DD Transceiver, Passive Copper Cable, 3 meters |
400G QSFP-DD Transceiver, Passive Copper Cable, 2.5 meters |
QSFP-DD 4x 100GBASE-CR2 Passive Breakout Copper Cable, 3 meters |
400G QSFP-DD Transceiver, Active Optical Cable, 3 meters |
- In a QDD-400-CU3M vs QDD-400-CU2.5M comparison, both are direct QSFP-DD passive copper cables with 1.5W per end, but the current SKU is the 3-meter orange member rather than the 2.5-meter yellow member.
- The QDD-400-CU3M difference from QDD-4ZQ100-CU3M is endpoint layout: QDD-400-CU3M keeps a direct QSFP-DD-to-QSFP-DD 400G path, while QDD-4ZQ100-CU3M is the 4x QSFP56 breakout copper option.
- QDD-400-CU3M vs QDD-400-AOC3M is a media-class comparison at the same 3-meter length; the current SKU is passive copper at 1.5W per end, while the AOC entry is active optical at 12W per end.
- For which model to choose, match the table to the required direct or breakout topology, 3-meter or 2.5-meter route, passive copper or active optical media, and Cisco host compatibility.
Selection Guide
1. Use the direct 3-meter copper PID for QSFP-DD-to-QSFP-DD links
Choose QDD-400-CU3M when the BOM requires a Cisco 400G passive copper cable between two supported QSFP-DD 400G ports and the physical route needs the 3-meter line item.
2. Keep shorter copper lengths as separate receiving items
Use QDD-400-CU2.5M instead only when the measured path is shorter and the yellow 2.5-meter SKU is the line item approved in the BOM.
3. Separate direct copper from QSFP56 breakout copper
Select QDD-4ZQ100-CU3M only when the design calls for a QSFP-DD port to break out into four QSFP56 100GBASE-CR2 endpoints instead of a direct 400G QSFP-DD-to-QSFP-DD connection.
4. Check active optical power when replacing media class
Use QDD-400-AOC3M only when the order intentionally changes the 3-meter link from passive copper to an active optical cable with the Cisco-listed 12W per-end power value.
Ordering Checklist
|
Check Item |
What to Confirm |
Why It Matters |
|---|---|---|
|
Exact PID |
QDD-400-CU3M appears on the order line and receiving label |
Similar QDD copper and AOC SKUs differ by length, fanout, and media class |
|
Endpoint layout |
Both endpoints are QSFP-DD 400G ports on Cisco-supported hosts |
This PID is a direct QSFP-DD-to-QSFP-DD cable, not a QSFP56 breakout assembly |
|
Cable route |
The rack path can use a fixed 3-meter passive copper cable without extension or conversion |
DAC length cannot be changed after receipt |
|
Breakout boundary |
The design does not require four QSFP56 100GBASE-CR2 endpoints |
Breakout requires QDD-4ZQ100-CU3M rather than QDD-400-CU3M |
|
Copper versus AOC |
The BOM calls for passive copper and 1.5W per end rather than active optical media |
QDD-400-AOC3M shares the 3-meter length but has another media class and power value |
|
Platform support |
Catalyst 9600 line-card orders check the C9600X-LC-32CD release-note context and the TMG matrix |
Cisco support depends on the exact platform, port, and software path |
|
UCS uplink use |
UCS 6652 or AI fabric orders verify the QSFP-DD uplink-only media list and certified optics note |
Cisco documents this SKU in specific UCS and validated-design contexts |
Specifications
| Parameter | Specification | Parameter | Specification |
|---|---|---|---|
| Product ID | QDD-400-CU3M | Brand | Cisco |
| Product family | Cisco 400G QSFP-DD modules | Product type | 400G QSFP-DD passive copper cable |
| Ordering description | 400G QSFP-DD Transceiver, Passive Copper Cable, 3 meters | Cable assembly type | Passive copper cable assembly |
| Connector form | QSFP-DD to QSFP-DD | Optical connector | No optical connector for passive copper cable |
| Ethernet rate | 400 Gigabit Ethernet | Nominal data rate | 425 Gbps |
| High-speed electrical interface | 400GAUI-8 C2M and OIF CEI-56G-VSR-PAM4 | Link length | 3 meters |
| Maximum power consumption | 1.5W per end | Pull tab color | Orange |
| Module weight | 600 g maximum | Module dimension with pull tab | 8.5 x 18.4 x 78.3/93.3 mm |
| Copper cable operation temperature | 0 to 70 degrees C | Storage temperature | -40 to 85 degrees C |
| FEC location | Performed on the host platform | Catalyst support example | C9600X-LC-32CD line card in Cisco IOS XE 17.13.x release notes |
| UCS media listing | Cisco UCS 6652 QSFP-DD uplink-only 400GbE media list | Compatibility reference | Cisco Transceiver Module Group Compatibility Matrix |
Get More Information
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