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Switch keeps locking up, even after replacing it


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#1 Modify

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Posted 02 May 2018 - 12:45 PM

I have 9 devices connected to my 16-port switch, including my laptop for testing. The switch then connects directly to my router about two feet from it. The problem is the switch will lock up or cause all my devices connected to it to lose network connectivity. This is verified by me continuously pinging the internet from my laptop while connected to the switch, plus I get the dreaded yellow exclamation mark on my network icon. When this happens, I can power cycle the switch and everything starts working again, BUT, within 1 to 2 mins, it will do it again.

 

To troubleshoot, I have connected each device separately to the switch to isolate which device or cable could be causing the issue. Shockingly, I found 6 of the 9 devices would cause the switch to fail or hang. Only 3 devices work without issue: my test laptop, and two credit card machines. So, before you say it must be the 6 devices and/or their network cables, these same devices and cables work just fine when connected directly to the router. They never lose internet or lock up the router; it’s only when any one of those 6 devices are connected to the switch, does the switch lock up. Also, what would be the chance I have 6 faulty devices or cables at the same time, but then they couldn’t be failing if they work fine in the router.

 

Anyhow, I figured it was likely a faulty switch, so I swapped it out, even using a different brand. Same issue, so I swapped the router, even used a different brand, and still also the same problem. I just don’t know, I’m really scratching my head on this one. Any suggestions or thoughts?



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#2 mikey11

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Posted 02 May 2018 - 12:49 PM

first thing i would do is test the ethernet cables.....or get somebody in to do it, as you probably do not have the equipment to certify ethernet cables as its quite expensive


Edited by mikey11, 02 May 2018 - 12:49 PM.


#3 Modify

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Posted 02 May 2018 - 01:10 PM

first thing i would do is test the ethernet cables.....or get somebody in to do it, as you probably do not have the equipment to certify ethernet cables as its quite expensive

They work fine when connected directly to the router, no Issues. Plus, what's the chances of 6 devices and/or cables going bad at the same time.



#4 mikey11

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Posted 02 May 2018 - 01:22 PM

 

first thing i would do is test the ethernet cables.....or get somebody in to do it, as you probably do not have the equipment to certify ethernet cables as its quite expensive

They work fine when connected directly to the router, no Issues. Plus, what's the chances of 6 devices and/or cables going bad at the same time.

 

 

 

how long are the cables?

 

is this an office or business?

 

are the cables in the ceiling space? walls?



#5 Modify

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Posted 02 May 2018 - 01:32 PM

 

 

first thing i would do is test the ethernet cables.....or get somebody in to do it, as you probably do not have the equipment to certify ethernet cables as its quite expensive

They work fine when connected directly to the router, no Issues. Plus, what's the chances of 6 devices and/or cables going bad at the same time.

 

 

 

how long are the cables?

 

is this an office or business?

 

are the cables in the ceiling space? walls?

 

It is in a store. Most of the cables in question are about 20' or 30', with two of them only about 6' to 10'. The short ones connect to the alarm system and directly to a AC adapter with a white box. Connecting anyone of these 6 cables will lock the switch up after 1 or 2 mins, but not when connected directly to the router.



#6 mikey11

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Posted 02 May 2018 - 01:35 PM

"The short ones connect to the alarm system and directly to a AC adapter with a white box."

 

what do u mean by this?

 

when did this start happening?


Edited by mikey11, 02 May 2018 - 01:36 PM.


#7 mightywiz

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Posted 03 May 2018 - 12:51 PM

are they POE injectors for running ac down the ethernet cable?

 

POE = power over ethernet

 

if that's the case then connecting of the devices are crucial.

 

they should have 2 ethernet connection (lan & POE) and 1 ac power adapter connector.

 

the lan end need to connect to the switch and the POE runs to the alarm system device.

 

if you have the wires backwards then you will cause issues and may even burn up your switch.


Edited by mightywiz, 03 May 2018 - 12:56 PM.





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