Forum Discussion

Aspirant

Oct 26, 2016

M4100 managed switches in series - dropping connection briefly

Hi all, Firstly, I'm totally new to this forum and have searched for my issue without success.. so apologies if this has been discussed before. The problem... I have an issue with a user usi...

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Troubleshooting

Retired_Member

Nov 04, 2016

Hi nhickey,

Thanks for your updating immediately.

I found that there is some 'Rx FCS Errors' in the port statistics. Which type fiber module you are using? Could you change another pair of fiber module and try again?

Thanks,

Eric
NETGEAR Employee

nhickey

Aspirant

Nov 04, 2016

Hi Eric,

The SFP mudule we are using is a Netgear one.. here's a link:

https://www.netgear.com/business/products/switches/modules-accessories/agm732f.aspx?cid=wmt_netgear_organic

Could there be a fault in the cable?? The trouble is, the cable connecting the two switches is under ground!

We have no spare SFP modules, and would need to get new ones. Would you recommend we do that?

Thanks,

Neil

nhickey
Aspirant
Nov 04, 2016
Hi guys,

I have another possible theory.. could heat be a factor? I'll try to describe..

We have a (approx) 250 meter fibre connection between the server room and the first M4100 D12 switch. This switch is situated in a 'pavilion' type building beside some tennis courts. It's in a communications cabinet mounted onto the wall, but there is no cooling in this cabinet. The issue seems to have appeard as we have been coming into our summer (we're in Zimbabwe by the way!). Temperature wise, we were up to 41C the other day or 105 F!). The user seems to think it's getting worse too, which would go with the heat theory.

It's just after midday here, so I took a walk to check the units visually. I took out the SFP module going to the second D12 and found it to be very, very hot!. I'm starting to think that the heat could be the problem.. and that we may be reaching the temperature limit of these modules!

What do you reckon? am I clutching at straws, so to speak!

Thanks,

Neil
- Retired_Member
  Nov 07, 2016
  Hi nhickey,
  
  I'm afraid it may cause switch some abnormal behavior when the environment temperature is too high. But we still cannot make sure. It's will be better that switch working on air condition environment.
  
  Below is the 'Site requirements for switch location' for Netgear Switch. Although the DUT working condition is in the range of desired, but the high temperature cause SFP module too hot, and it may cause some abnormal.
  
  Thanks,
  
  EricZ
  NETGEAR Employee