bad connection for poe switch

April 11, 2013 at 08:17:34
Specs: Windows 7
Using two star connecters, connecting fiber between two cisco managed Poe switches. second switch experiencing bad voice quality over phones. Phone connected to first switch are good.
Replaced second switch and phone quality still poor. 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.

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#1
April 11, 2013 at 08:53:48
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.

***William Henley***


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#2
April 11, 2013 at 09:33:54
Thank you,
Sorry I used the wrong term, I know they are converters. I only have 4 phones connected to this switch, we keep data and phones separate. The phones have worked perfectly for the last 18 months. We do have a UPS, but I will upgrade to a better one.
It was suggested that I should use 2 GBIC instead of the 2 Star Converters. Would a switch to GBIC be a smart move?

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#3
April 11, 2013 at 09:59:23
Moving to a GBIC will certainly eliminate one point of failure. I prefer to use them whenever possible.

If the phones worked perfectly until the power outrages, and you've swapped out the switch, it's a pretty safe bet the media converter is the problem. If you ask me, this would be the perfect time to change to GBIC's from the media converter.

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.

***William Henley***


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