TL SG-2428 V2 with deco and sg105
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Just recently installed a home network and now that it's commissioned I am only getting 1000 speeds on 1 port of the switch.
My set up is:
EE router hard wired to deco M9 plus(main)
Cat 7 to the sg2428p. This connected port shows 1000.
I have multiple other deco M9 plus and Deco M5 connected to the switch all showing 100.
Tlsg105 for home office connected showing 100 at the sg2428p also. Need this one to be 1000 given the traffic from the office.
All cat 7 cable runs are from same batch and tested good. No long runs over 15m.
Deco is in router mode. There are 2 decos still fully WiFi as I haven't ran cabling yet.
Any suggestions or changes to the set up to improve the speeds would be appreciated.
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@Clive_A I've messed about with devices per your suggestion. I was using a deco m5 which should support Gbit. The issue with them seems to be that I had added a poe splitter so I didn't have to run power to them but looks like this isn't Gbit. Direct connect and separate power now showing Gbit on the switch. Might need to upgrade some of the decos to Poe compatible versions.
The office switch I put into a different port and is also now showing Gbit even though both ports test fine. Glad I don't have to pull the office cable as it's an 8m run. Problem solved, thanks for your help.
@Clive_A thanks Clive, it does look to be a cabling or termination issue. I ran cable diagnostics on the switch and the 100 ports are only showing 2 pairs, the 1000 port is showing all 4. All cable lengths are reporting true. I've tested some cables again separately and it's reporting all cores on my simple tester. Going to use a proper diagnostics tester this afternoon when I get it later and perhaps try re terminating one of the runs to see if it makes a difference... 
@Clive_A I've messed about with devices per your suggestion. I was using a deco m5 which should support Gbit. The issue with them seems to be that I had added a poe splitter so I didn't have to run power to them but looks like this isn't Gbit. Direct connect and separate power now showing Gbit on the switch. Might need to upgrade some of the decos to Poe compatible versions.
The office switch I put into a different port and is also now showing Gbit even though both ports test fine. Glad I don't have to pull the office cable as it's an 8m run. Problem solved, thanks for your help.