DS218+ and CAT-7 ethernet cable goes to 100mbps

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DS218+ and CAT-7 ethernet cable goes to 100mbps

15
0
NAS
DS218+
Operating system
  1. Windows
Mobile operating system
  1. iOS
Hi all,

I have a DS218+ and I've been trying to INCREASE the network speed to the device in my apartment (pre-wired CAT 5E). I was unable to maintain 1gbps on my PC, as network card would automatically downgrade after a while... what I did, ordered some Cat7 shielded cables from Amazon and changed the CAT6 ethernet cable FROM PC to wall ethernet plug and that SOLVED the problem! Like I maintained 1gbps on my network card for days now without any issues. Now, I can reach upto 600mbps (very short bursts) while transfering files.

So, I ordered EXACT same cable for the Synology to see if it helps get closer to 1gbps, shockingly, changing the cable DOWNGRADES the Synology to 100mbps! I restarted both Router and Synology to no avail, it can only work at 100mbps! Changing the cable back to old CAT6 cable, it goes back to 1gbps.

Why could this be? That my PC and Synology act totally different, one benefits, the other doesn't?! Am I doing something wrong?! I assume the new CAT7 cable is faster and has more shielding, so WHY it's recognized as 100mbps by Synology (or router)?
 
2,108
891
NAS
DS220+ : DS1019+ : DS216+II : DS118 : DS120j : APC Back UPS ES 700 — Mac/iOS user
That’s strange. However, for testing, can you move the Synology with the new cable to connect it directly to the switch?
As I understand it, you have no control over the cabling in your home (5E) and you can only change the end points. It could be that having the new cables at both ends is “overwhelming” the wiring for some reason to the point where the devices decide to drop down to 100. Although 5E should handle 1Gb fine.

Try moving the devices to a different home wire (different wall sockets) and see if anything changes.

What I’d also do, is check the wiring map on the wall cable to make sure it’s correct. You’ll need a device for that (they can be very cheap to very expensive), but you can try to borrow one from your work if they have them.
Sometimes when (if) the network cabling is done by electricians, they don’t map them correctly and do a straight wire.
 
15
0
NAS
DS218+
Operating system
  1. Windows
Mobile operating system
  1. iOS
Yeah, quite strange. Maybe this weekend I will do some more testing. It makes no sense.

BTW, what kind of speeds can I expect in a home network with 5E? Is getting 500-600mbps (MAX), and average 200-300 OK?
 
2,108
891
NAS
DS220+ : DS1019+ : DS216+II : DS118 : DS120j : APC Back UPS ES 700 — Mac/iOS user
Something like this maybe. I'm not sure of what wires I have going through the walls, but they did a good job 🤣

61996B0C-30BC-4D2A-A175-3DED08B8DEAB.jpeg
 
15
0
NAS
DS218+
Operating system
  1. Windows
Mobile operating system
  1. iOS
Ok, so just ran the same test with old cable and I got this... which means it's as good as it gets!
 

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96
31
NAS
DS218+
I suggest checking your wiring for the Cat7. I had a problem with my Cat5 and found that I had broken a wire when wiring a wall socket. A simple cheap continuity tester similar to the device below diagnosed problem rapidly.

Cable tester.jpg
 
179
26
NAS
DS 718+, DS 720+
Router
  1. RT2600ac
Operating system
  1. Windows
Mobile operating system
  1. iOS
Last edited:
I have a led cable tester and the cables passed that, yet still had issues with New Cat 6 cables falling back to 100MB speeds consistently.
I bought a small net gear managed switch, with a built in cable test routine, and it indicated that all my new eBay CAT6 cables had “Impedance Mismatch” failures, though they passed the led tester.
A couple older CAT6 cables, though longer passed, so tried them! Success!
Ended up testing all cables — ending up re-purchasing many new cables: Monoprice, and they passed. I had one more shipment from eBay and when they arrived they ALL failed as well (same error) so were refused and sent back. Others were cut and pitched. 4 of the remaining EBay cables had already been run in pvc piping outside for POE 100MB cameras — They remain, and work ok at 100MB, but have been flagged as: ‘100MB use Only’. That was 2 years ago, and went from many different speed problems that came & went — to 100% Solid GB Operation.
Apparently there is a lot of poor cable being passed off as CAT6 cable. I learned my lesson the hard way: buy Cable from trusted sources!
That inexpensive Netgear managed switch was worth far more tha the $12 I paid for it!
 
179
26
NAS
DS 718+, DS 720+
Router
  1. RT2600ac
Operating system
  1. Windows
Mobile operating system
  1. iOS
I’m not home now. But it was a 5 port managed switch new for $12..
Worth it’s weight in gold. GS105Ev2
Looks like it is $20 now. Still worth it
 
15
0
NAS
DS218+
Operating system
  1. Windows
Mobile operating system
  1. iOS
Last edited:
I’m not home now. But it was a 5 port managed switch new for $12..
Worth it’s weight in gold. GS105Ev2
Looks like it is $20 now. Still worth it

Oh cool, I actually have the GS105! but it's the unmanaged version, should I upgrade and get the managed one?! Mine has lights that light up per cable speed. For instance, a Cat 5E only light up as 100mbps that I threw out, BUT the one cable in question lights up Green, meaning it's 1gbps.
 
179
26
NAS
DS 718+, DS 720+
Router
  1. RT2600ac
Operating system
  1. Windows
Mobile operating system
  1. iOS
Last edited:
Some of eBay cables went back and forth between 1000 & 100….. making me think other devices were bad,instead of cables: Cables are new and made by professionals, right???? This went on for months because I didn’t realize an led tester is not sufficient to determine cable quality.
Obviously I didn’t want to spend $800 for a dedicated cable tester, but seeing how the led tester passed bad cables, I had to come up with plan B, and this managed switch’s cable test routine was helpful.
I tested all cables I own, and nothing is used without first testing & Passing via that device. During the Test & Purge, I Pitched about 10 cables that failed. All that failed reported as: Impedance Mis-Match, yet passed LED Tester.
 
96
31
NAS
DS218+
Although there a different types of LED tester, most if not all are just doing a basic continuity test at DC and not at high frequency.
 
15
0
NAS
DS218+
Operating system
  1. Windows
Mobile operating system
  1. iOS
Although there a different types of LED tester, most if not all are just doing a basic continuity test at DC and not at high frequency.

So, only a managed switch would be able to do a proper test? I also have a TP-link switch (unmanaged), which has a cable test feature.
 

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