low bandwidth spikes on ccr1016

Hello everyone, I have a problem on my ccr1016. a strange thing happens with traffic, have low bandwidth spikes, which result with small falls of users access. How can I fix the problem? I attach a 'view to better understand
low band.jpg

no help?

Were you able to understand (or at list “suspect”) if/how this “low spikes” are connected with other facts like:

  • a system in the lan shutting down or rebooting?
  • a system in the lan switching the ethernet adapter into promiscous mode?
  • electromagnetic interference? (an elevator, a factory you are close to, the vacum cleaner, you name it)
  • a specific application starting up in one system of yours?
  • any other…

What category of ethernet cables you use? Shielded or unshielded? Or mixed?
If shielded, are they properly grounded on BOTH sides of the line?
(I’ve seen more troubles from shielded than unshielded cables… and even more troubles in mixed environments)
What’s the maximum length of your longest ethernet cable?

Let’s start from here.