Deco BE85 SFP+ overheating

Deco BE85 SFP+ overheating

Deco BE85 SFP+ overheating
Deco BE85 SFP+ overheating
2025-01-28 09:47:20 - last edited 2025-02-20 10:47:03
Model: Deco BE85  
Hardware Version:
Firmware Version: 1.1.1 Build 20241023 Rel. 34667

I have a pair of BE85 configured as "Access Point" and I'm using SFP+ module to connect them to my switch. Modules model is TP-Link TL-SM5110-SR.

I've being using the SFP+ modules for a couple of weeks now, before that I used 10Gtek DAC on primary and RJ45 between the 2, no switch.

 

After I started using the sfp fiber modules, my connection became unstable, some times I see an error on Deco App saying "Abnormal WAN port speed. Please check your WAN port connection." And I need to reboot the decos for the error to go away.

When this error is showing, they can't reach the full internet speed on speedtest measurements. I've checked speeds on a PC connected directly to the switch and was able to reach full speed as expected.

 

I have noticed that the SFP+ module is really hot to the touch, while the ones connected to the switch (another brand of modules) are warm but within normal operation temperatures.

 

Shouldn't my deco fans be kicking in to cool down these modules? I didn't hear the fans kicking in since I plugged these modules, and one of the decos is on my computer desk, so I am able to hear it when it kicks in.

 

SFP+ modules have temperature reporting but it seems like the Deco's software doesn't check it at all to see if fans need to spin up. It would also be nice to have the module information on the webpage accessible via the main deco IP address.

 

I'm sure this issue I'm experiencing is due to the modules overheating but there's absolutely nothing on the logs about that.

 

Please make it so the fans spin up if SFP+ modules are running hot!

 

 

Best Regards.

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#1
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1 Accepted Solution
Re:Deco BE85 SFP+ overheating-Solution
2025-02-06 03:11:36 - last edited 2025-05-08 09:07:33

  @Maunose 

Update:

It is recommended to test whether the following firmware here helps with the current issue:

Deco BE85_1.1.3 New firmware with Optimized System Stability and Network Performance

 

The operating temperature range of Deco BE85 (0°C~40°C or 32°F~104°F) specifies the environmental conditions rather than the inherent temperature of the products or hardware. While SFP modules tend to generate more heat compared to standard Wi-Fi routers, most qualified commercial optical transceivers can withstand temperatures of up to ~70°C. Additionally, Deco BE85 is equipped with a built-in fan designed to dissipate heat effectively, ensuring proper functionality of the SFP modules in conjunction with Deco under current conditions. If you have concerns about temperature levels, pointing a fan towards the modules can provide additional cooling.

Moreover, it is advised not to touch the operational SFP modules with bare hands, and most of the SFP modules have a rubber cover to prevent direct contact.

So, as long as the temperature remains within the specified range, it should be ok.

Best regards.

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#2
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8 Reply
Re:Deco BE85 SFP+ overheating-Solution
2025-02-06 03:11:36 - last edited 2025-05-08 09:07:33

  @Maunose 

Update:

It is recommended to test whether the following firmware here helps with the current issue:

Deco BE85_1.1.3 New firmware with Optimized System Stability and Network Performance

 

The operating temperature range of Deco BE85 (0°C~40°C or 32°F~104°F) specifies the environmental conditions rather than the inherent temperature of the products or hardware. While SFP modules tend to generate more heat compared to standard Wi-Fi routers, most qualified commercial optical transceivers can withstand temperatures of up to ~70°C. Additionally, Deco BE85 is equipped with a built-in fan designed to dissipate heat effectively, ensuring proper functionality of the SFP modules in conjunction with Deco under current conditions. If you have concerns about temperature levels, pointing a fan towards the modules can provide additional cooling.

Moreover, it is advised not to touch the operational SFP modules with bare hands, and most of the SFP modules have a rubber cover to prevent direct contact.

So, as long as the temperature remains within the specified range, it should be ok.

Best regards.

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#2
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Re:Deco BE85 SFP+ overheating
2025-04-27 19:11:42 - last edited 2025-04-27 19:19:30

  @David-TP 

 

Hello,

 

I also think my SFP+ is hot compared to the one on my ISP switch (Freebox Ultra, French ISP). It's a Skylane LR SFP+ kit. It would be really nice to have more technical information on the web interface or the Deco application (optical budget, errors, temperature, ...) cool
 

My Freebox has an SFP+ port so I connected it via fiber optics, not Ethernet via a copper SFP.
 

My network : Freebox Ultra SFP+ (bridge mode) <--> BE85 (number 1) SFP+ <--> BE85 (number 1) 10Gbps RJ45  cat8 <--> switch keepLiNK "KP-9000-6XHML-X2" SFP+ port with copper SFP 10Gbps.

Switch :

- 1 port 2.5Gbps <--> BE25 (number 1)

- 1 port 2.5Gbos <--> BE25 (number 2)

- soon : 1 port 10Gbps SFP+ <--> BE85 (number 2) (currently WiFi)

 

 

Too bad there isn't a second SFP+ port on BE85 laugh

 

Firmware : BE85 1.1.3

 

Sorry for my english, I'm french blush

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#3
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Re:Deco BE85 SFP+ overheating
2025-04-28 07:57:02

  @jlambert 

Hi, thank you very much for the feedback.

Indeed, there hasn't been much information about the SFP+ status on the Deco APP/Web interface. It would be great if you could post a feature request here:

https://community.tp-link.com/en/home/forum/2252

 

Would there be an obvious temperature difference between the SFP ports of Freebox and Deco?

Or are you able to test the temperature of SFP modules to see whether it is still within Deco Operating Temperature: 0°C~40°C (32 °F~104 °F)?

Wait for your reply.

Best regards.

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#4
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Re:Deco BE85 SFP+ overheating
2025-04-28 11:50:16

  @David-TP 

 

Hi,

 

Yes, here be an obvious temperature difference between the SFP ports of Freebox and Deco. You can feel it when you touch them with your fingers... The one of the deco is burning angry The one of the Freebox is under 40°C (tested with a human thermometer that measures a max of 42°C / the one of the deco indicates "Hi")

 

However, the technical sheet of my SFP+ LR (10km) kit indicates • Operating temperature range 0°C to 70°C or -40°C to 85°C

 

I hope there is no risk for the deco... frown

 

 

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#5
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Re:Deco BE85 SFP+ overheating
2025-04-28 14:09:51

  @jlambert I have AT&T fiber service.  It uses a SFP ONT.  I also have 2 TL-SM5110-SR between my DECO BE95 and Netgear XS508M switch with LC whatchamacallit fiber, (the skinny long range option).  I have to use an oven mitt to touch them or grab the release handle with extra long finger nails.  They do run HOT, impossible for at least my human hands to touch.  (My uncle once labeled me baby hands, but I do do some vehicle oil changes hot/operating temp).

 

The instability is a concern but I am not worried about the heat unless a warning about heat/temperature pops up.

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#6
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Re:Deco BE85 SFP+ overheating
2025-04-28 14:48:44
Can you verify you are not mixing LR with SR? Meaning you connect TL-SM5110-SR to TL-SM5110-SR or TL-SM5110-SR to SPP130100B? SR is multi-mode and LR is single-mode...
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#7
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Re:Deco BE85 SFP+ overheating
2025-04-28 15:38:00 - last edited 2025-04-28 17:34:25

  @jzchen 

 

SFP+ LR Skylane SPP130100B (port SFP+ Freebox) <--> SFP+ LR Skylane SPP130100B (mode routeur BE85, il récupère mon adresse IP publique (Freebox en mode bridge)

Même problème avec un autre kit SFP+ (je travaille dans les télécoms, j'ai beaucoup d'optiques rire)

 

Je n'utilise pas de TP-Link SFP+, j'utilise 2 Skylane monomode.

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#8
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Re:Deco BE85 SFP+ overheating
2025-04-29 02:28:27

  @jlambert 

Thank you very much for the further details.

In this way, I'd like to escalate your case to the senior engineer for further assistance.

Please check whether you have received my email.

Thanks again and best regards.

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#9
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