Cisco QSFP-40G-SR-BD 40G Short-Reach Duplex-Fiber BiDi Transceiver
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Short rack and campus interconnect selection
Match both host ports, connector type and the actual cable route for short links.
Deployment scope
Match both host ports, connector type and the actual cable route for short links. Measure the installed path including bends, rack movement and service access. Choose supported direct-attach or optical links and label both ends. For pluggable optics, confirm fiber type and patching rather than selecting on distance alone.
Component decisions
- 10G SFP+, 40G QSFP+ and 100G QSFP28 describe different interface families. Check both ends and the host support list.
- Keep DAC and AOC length suffixes such as 3M, 5M and 7M. Required route length includes service loops and bends.
- QSFP-40G-SR-BD uses a duplex multimode LC link. It is not a single-mode single-fiber module and should not be described as a 100G dual-rate optic.
Acceptance plan
- Verify exact cable lengths, host identifiers and connector fit.
- Test link mode, error counters and optical diagnostics where available.
- Check strain relief, bend radius and access for replacement.
Configuration boundary
Length is part of an assembly specification, not just a delivery preference. Changing a DAC or AOC length changes the item being ordered and can change host support. A cable that fits the rack in a drawing may still be too short after real routing and service loops.
Technical references
Cisco 40G QSFP 、DAC AOC — official reference: https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/data_sheet_c78-660083.html Cisco — official reference: https://tmgmatrix.cisco.com/ Fiber. Great In Your Diet. Costly In Your Data Center. — official reference: https://blogs.cisco.com/sp/fiber-great-in-your-diet-costly-in-your-data-center Cisco 10G SFP+ — official reference: https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/data_sheet_c78-455693.html Cisco 100GBASE QSFP-100G — official reference: https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/datasheet-c78-736282.html
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