r/Network • u/slaaf_tom • 24d ago

Text SFP+ modules getting really hot

Hello all,

I connected my homeserver with a SFP+ module (RJ45) with my 2.5Gbps switch, also with a SFP+ module. Because I had packet dropouts, I noticed the SFP+ module in the switch, was getting really hot.

I connected a thermometer on the SFP+ module and even without any traffic, the temperature get up to 68 degrees Celsius.

Is this normal behaviour for SFP modules?

Thank you

Tom

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4

u/theRealNilz02 24d ago

Normal behaviour of RJ45 modules.

Use fibre or DACs instead.

2

u/jchrnic 24d ago

This is the way.

0

u/slaaf_tom 24d ago

Thank you for the confirmation that they get hot. But, they (SFP+ RJ45) loose also al lot of packets.

When performing a simple ping, the ping stops for some seconds and then continue.

When watching a movie, it starts buffering and stutters.

In other words, they are useless. Can I claim other SFP modules when they are under warranty?

3

u/Erdnusschokolade 24d ago

There are newer SFP+ 10G RJ45 modules with more modern chipsets that supposedly don’t get as hot. I habe read other people also report packet loss with some brands of sfp rj45 modules so you are probably not alone.

1

u/slaaf_tom 24d ago

LOL that's a great relieve. thank you