SoHo Connection XS712

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Leffi wrote:

I have 5 PCs plus printer and other components connected to a xs712t 10GB switch now.

That one replaces an 1GB switch 16 port d-link switch. The PCs connect with 1GB Ethernet at the moment.

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Before fully decommission the 1Gb switch, be reminded that 10 GbE switches can't handle 10 Mb/s legacy Ethernet.

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Leffi wrote:

If i take a XS505M and connect it with standard Cat6-cable, can i use any port, or do those switches have designated "Uplink ports"? I cannot find any information about uplink port or Auto MDI-X on the ports.

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There are no designated uplink ports on any newer Netgear switches, this was a problem 20+ years ago on early 10/100 Mb/s only. Auto MDI-X is (de-facto or effective?) standard for decade or more on any Gb/s and 10Gb/s switches.

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Leffi wrote:

Or should i buy XS508 which has more bandwidth  (160 instead of 100 GBit/s) would it make a difference? 

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Only if you need more ports, or if you expect five copper ports as the XS505M has only four, plus one dedicated SFP+. The bandwidth on the data sheet is coming from the full wirespeed switching for n2n - you don't have more bandwidth in total due to the number of bi-directional ports. 

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Leffi wrote:

I would connect the NAS, internet, a second NAS as Mirror, and 1 additional PC.

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If Internet translates to the router LAN interface that's OK. 

In case you intend to install the router on another location, e.g. in a rack with the XS712T, or plan to run multiple VLANs, be aware the XS505M/XS708M are non-manged and can't be configured for multiple VLANs to isolate Internet/WAN from the LAN(s), or to add more VLANs (guest, IoT, block storage, ...).

Edit - one more constraint: With the XS505M/XS508M you can't run trunks/LAG/aggregation groups between the two switches. As you intend to run a NAS, think about the need to offer link aggregation for the NAS as more and more NAS can offer performance beyond of a single 10 Gb/s link, so hink about having two 10G ports for a future NAS, too.