407-BBYP-BCC | Dell Compatible 10/25GB Multi-Mode - 300m (10GBASE-CSR / 25GBASE-CSR)

Q: Will this work in place of the Dell 407-BBYP?
A: Yes. This transceiver is fully compatible with Dell 407-BBYP based on matching SFP28 form factor, 10GBASE-CSR and 25GBASE-CSR standards compliance, 850nm wavelength, and multi-mode fiber support. It provides plug-and-play operation in Dell networking equipment supporting these standards.

Q: Which Dell platforms support this transceiver?
A: This transceiver works in Dell networking switches, routers, and line cards with 25G SFP28 ports that support 10GBASE-CSR and 25GBASE-CSR standards. Compatibility depends on the port supporting the CSR or ESR variant standards and multi-mode fiber at 850nm, not specific model numbers.

Q: What is the difference between 10GBASE-CSR and 25GBASE-SR reach?
A: 10GBASE-CSR extends reach to 300m on OM3 and 400m on OM4, while standard 25GBASE-SR is limited to 70m on OM3 and 100m on OM4. CSR variants maintain the extended reach at both 10G and 25G speeds, critical for data center deployments where cabling closets are 300m or more from core equipment. FEC is required on the host port for full 25G reach.

Q: Can I mix 407-BBYP and 407-BCBK variants on the same link?
A: Both variants support the same core standards and wavelength, but the 407-BBYP is optimized for 25GBASE-ESR while 407-BCBK is a true dual-rate 10/25GBASE-CSR module. For links requiring 10G backward compatibility or dual-rate negotiation, use 407-BCBK on both ends. For 25G-only links, either variant works when both ends match specifications.

Q: Does this transceiver support breakout from 100G QSFP28 ports?
A: Yes. When used with a 100G QSFP28 to 4x25G SFP28 breakout cable or adapter, this transceiver supports breakout applications from 100GBASE-SR4 ports. Each of the four 25G lanes operates independently, and the CSR standard ensures compatibility with legacy 10G infrastructure if the host switch supports mixed breakout speeds.