StarTech.com AOC Breakout Cable for Cisco QSFP-4X10G-AOC10M - 15m/49ft 40G 1x QSFP+ to 4x SFP+ AOC Cable - 40GbE QSFP+ Active Optical Fiber - 40Gbps QSFP Plus/Transceiver Module Breakout Cable - C9300 C3850 (QSFP4X10AO15)~AOC Breakout Cable for Cisco QSFP-4X10G-AOC10M - 15m/49ft 40G 1x QSFP+ to 4x SFP+ AOC Cable - 40GbE QSFP+ Active Optical Fiber - 40Gbps QSFP Plus/Transceiver Module Breakout Cable - C9300 C3850

Product Overview

AI-generated summary

If you’re buying this, it’s almost certainly because you’ve got a Cisco switch with the right QSFP+ port and you want to fan it out to 4x 10Gb SFP+ using active optics—i.e., you need reach and you don’t want to run copper the whole way. The value proposition here is that it’s a “just works” breakout AOC option for the Cisco C9300/C3850 style setups, where the alternatives are usually either much more expensive OEM cabling or cobbling together modules that may or may not behave nicely with your exact transceiver mix. At £131.68 ex-VAT for a 15m run, it’s not cheap, but it’s the sort of price you pay to avoid network downtime and compatibility headaches.

That said, I wouldn’t buy it speculatively. AOCs are picky about matching the right host port and Cisco part expectations, and once you’re in the wrong pairing you can end up with link instability or “won’t negotiate” scenarios—painful for something that should be boring. Also, if your environment is mostly short-reach (and you’ve got the budget for optics), copper or standard optics may be more flexible long-term. **Who should buy:** teams standardising on Cisco 40Gb fan-out to 10Gb with a known QSFP+ requirement and needing 10Gb distances that copper can’t comfortably cover. **Who shouldn’t:** anyone chasing a bargain for mixed vendor gear, or anyone who needs maximum flexibility across different switch models.