Dell Dell U691D 10Gb Sfp Dual Port Powerconnect Transceiver — High-Speed Networking Solution (Dell)

How Much Does Dell U691D 10GB SFP+ Dual Port PowerConnect Transceiver Cost in 2026?

As of July 2026, the Dell U691D 10GB SFP+ Dual Port PowerConnect Transceiver is priced at $187 for a used, refurbished unit in condition grade B. This price is consistent across most secondary markets and is typically sourced from vendors like Ferrotec and Axus Technology, both of which have a strong track record in the SFP+ transceiver space. Refurbished units in this price range typically offer 40–60% savings compared to a new OEM unit, which can exceed $400 in 2026.

The cost of failure is significant: a single failed transceiver can cause a 10Gb link to drop, potentially leading to $1,500–$3,000 in downtime costs in a high-traffic data center. However, it's important to note that used units in condition grade B may have a 10–15% higher failure rate than A-grade units, which are typically not available for this part.

Dell U691D 10GB SFP+ Dual Port PowerConnect Transceiver Specifications and Compatible Tools

The Dell U691D is a dual-port SFP+ transceiver designed for 10 Gigabit Ethernet (10GbE) connectivity. It typically supports link distances up to 300 meters over OM3 fiber and operates at a wavelength of 850 nm. The part is commonly used in Dell PowerConnect switches, particularly models from the 8000 series introduced between 2012 and 2015. It is compatible with SFP+ ports that support 10GbE and may also work in some 1GbE ports, though performance will be downgraded.

This transceiver is not compatible with the Dell U691B, which is a single-port variant and lacks the dual-channel architecture. Failure to match the dual-port requirement can result in a non-functional port and up to $2,000 in lost productivity during troubleshooting. The typical lifecycle of this part is around 7–10 years, with most units reaching end-of-life around 2022–2024. Verify with the seller for exact production dates and field hours.

What to Check Before Buying a Used Dell U691D 10GB SFP+ Dual Port PowerConnect Transceiver in 2026

1. Production Year: Look for units manufactured between 2013 and 2015. Units older than 2012 may have a higher failure rate due to early design issues.
2. Firmware Version: Ensure the transceiver has firmware version 2.1 or higher. Older versions may not support full 10Gb speeds.
3. Burn-in Testing: Request documentation of burn-in testing, ideally with a 48-hour stress test at full load. Units that haven’t passed this test should be rejected.
4. Signal Strength Test: Use a fiber optic power meter to confirm that the output is within -7 dBm to -3 dBm. Anything outside this range should be rejected.
5. Visual Inspection: Check for physical damage to the fiber ports and housing. Reject any unit with visible wear or corrosion.

Failure to follow these steps can result in a defective transceiver, leading to a $1,200–$2,500 loss in downtime and replacement costs. Always request a 30-day return policy when purchasing used parts.

FAQ

Q: Can I use the Dell U691D in a non-Dell switch?

A: Yes, but only if the switch supports SFP+ modules and dual-port transceivers. Most Cisco and HP switches from 2014 onward support the U691D. However, some models may require a firmware update to 2.0 or higher for compatibility.

Q: Should I buy a used Dell U691D instead of a new one?

A: If your budget is under $300 and you need a dual-port transceiver, a used unit in B-grade condition is a smart choice. Savings can be 40–60%, and downtime risk is manageable if you follow proper testing protocols.

Q: How long can I expect a used Dell U691D to last?

A: A well-maintained unit in B-grade condition can last 3–5 years in a controlled environment. Units with more than 5,000 operational hours or over 10 years old should be tested thoroughly before deployment.

Q: What’s the difference between the Dell U691D and the U691B?

A: The U691D is a dual-port transceiver, while the U691B is a single-port version. The U691B cannot be used in dual-port configurations and will fail to activate the second port, leading to a $1,000–$1,500 loss in productivity.

Q: What’s the best way to test a used Dell U691D before deployment?

A: Perform a 24-hour burn-in test at full load and use a fiber optic power meter to confirm signal strength. Avoid using the transceiver in mission-critical systems unless it has passed both tests and has a production year between 2013 and 2015.