|I'm not sure why you're calling that a "star connector". If you hadn't included "ET91000lc" I wouldn't have had a clue what you're talking about. That is actually called a "media converter" as it converts the signal from copper to fiber optic and the reverse.|
Are you having any issues with any other type of data in switch 2?
Are you using QoS on switch 2 and if yes, check that you're giving VoIP the highest priority.
Problem started after multiple power outages in short period. Could this cause connecter to go bad. How can I tell if the Star ET91000lc is bad.
I've had to replace a media converter a time or two because they can go bad. They types of power fluctuations incurred with outages can most certainly adversely affect a device like this.
If all data on switch two is affected, then the most likely suspect would indeed be the media converter. I keep no less than one spare handy in case because it's actually pretty easy to replace the converter and as a troubleshooting step, only causes minor disruption to traffic flow. In your case, if it fixes the issue, problem solved.
I would suggest you replace it considering everything else you've done. I would also suggest you get yourself a good UPS to plug devices like the media converter (and the switches) into. This can, and will, save you time and money in the future.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.