I’m thinking about ordering some QSFP-40/100-SRBD modules for links where we want to support both 40G and 100G over existing duplex multimode fiber, rather than re-cabling everything to MPO. On paper it sounds ideal since these can handle both speeds and use duplex MMF, but before I click buy I want to hear how they perform in real deployments.
A few things I’m curious about:
Speed negotiation: Has anyone actually run these in an environment where you switch between 40G and 100G? Do ports negotiate cleanly, or have you run into weird behavior depending on switch platform or firmware version?
Fiber sensitivity: Duplex MMF can be less precise than MPO arrays. Have you noticed that fiber cleanliness, length, or older patch panels cause instability with QSFP-40/100-SRBD more than you expected, especially at 100G?
Performance & heat: Once these have been live for a while, does they stay stable under load? Any quirky power/thermal behavior when you pack several of them in a chassis?
We’re trying to balance the cost/time of re-cabling with using what we already have, so QSFP-40/100-SRBD seems promising if it’s reliable. If you’ve bought and deployed them recently, what would you double check before ordering? And did they actually live up to expectations once they were in production? Thanks!
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