DAC-SFP-25G-xM-BCC | Dell Compatible SFP28 To SFP28 Copper Direct-Attach 25GBASE-CR1 Cable | 1 to 5M

Q: Will this work in place of the Dell DAC-SFP-25G-1M?
A: Yes. The DAC-SFP-25G-xM-BCC is a passive 25GBASE-CR1 SFP28 to SFP28 twinax cable that matches the Dell DAC-SFP-25G-1M specification for form factor, data rate, and connector type. It is plug-and-play compatible with Dell switches, storage, and servers equipped with 25GB SFP28 ports.

Q: Which Dell platforms support this cable?
A: This cable is compatible with any Dell switch, storage system, or server that has SFP28 ports supporting 25GBASE-CR1. Compatibility depends on the port standard, not the platform model. If your Dell hardware accepts the OEM DAC-SFP-25G-1M series, this cable will function identically.

Q: Do I need to enable FEC on my switch ports for this cable?
A: FEC requirements depend on cable length. 1M and 2M cables typically operate without FEC. 2.5M and 3M lengths generally require BASE-R FEC (also called FC-FEC) for stable link operation. 5M cables may require RS-FEC depending on your platform's PHY and link margin. Consult your switch documentation for FEC configuration commands.

Q: Can I mix different lengths from this family in the same switch?
A: Yes. Each cable is a self-contained passive twinax assembly with its own SFP28 connectors, and each port negotiates independently. You can deploy 1M, 2M, 3M, and 5M cables in adjacent ports on the same switch without concern, provided each port is configured with the appropriate FEC mode for the installed cable length.

Q: What is the difference between passive and active 25GB SFP28 cables?
A: Passive DAC cables like this one rely entirely on the host switch or NIC to drive and condition the electrical signal over copper, consuming no power in the cable itself. Active cables contain signal-boosting integrated circuits at each end, drawing power from the SFP28 cage, and support longer reaches (typically 7M and beyond). Passive cables cost less, generate no heat, and are preferred for short intra-rack or adjacent-rack links where reach permits.