We have our engineering team looking into this for additional analysis. This cable was the first thing we investigated when we first heard port flapping concerns a while back. We validated back then that the manufacturer met our spec on shield, gauge, material and twist, we’ll be reconfirming this yet again. It was not found to be a primary cause for unexpected flap conditions (conditions reasonably under cable distance limitation) that people were reporting when we went out and investigated different reported cases.
Obviously by design with a jumper, there are always going to be very edge cases where the existence of the jumper will introduce small enough loss to lead to flapping down to 100 BASE-T, and this is minimized under normal distance budgets and signal margin when a good quality jumper is used.
We’re taking yet another look at it, and will be asking the couple of people like Ronaldo Adriano Ramon that reported the situation where this improved the stability to get us the units (at Mimosa’s cost of course) so we can compare to the design spec and any further analysis. We’ll report back on this thread what we find in a couple of days.