10GBASE-T shielded cable switch-to-server connection

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I'm venturing for the first time into the 10 gigabit (over copper) realm. Likewise, I have never worked with shielded CAT-5/6 cables previously. From my own research, I understand the types and benefits of shielding when it comes to long runs of network cable, such as between a patch panel and a wall jack in an office.

I'm less clear about the use of shielded patch cables (<15ft), particularly when the cable is connected directly from a server to a switch with no patch panel in between (i.e. nothing to ground the cable). This will be my situation when we purchase a few Dell PowerConnect 8164 switches, install them at the top of our server racks (facing the rear), and install Intel X540-T2 NICs in the servers.

Here's what I'm trying to figure out:

  1. Is there any benefit in using Cat-6A over regular Cat-6 stranded patch cables?
  2. Is there any benefit in using shielded (e.g. S/FTP) cables? I know this is related to EMI and some other environmental factors, but I have no way of measuring this.
  3. When a shielded cable is connected directly from the server to the switch, are there some additional electrical requirements that one or both sides must support?

Thanks!

Best Answer

A shielded cable main purposes are:

  1. To make sure that any electrical discharge (even one from a wool blouse would produce) doesn't get accidentally sent into your TX or RX wires and burn some chip/board/system but redirected instead through the shield into the closest ground.
  2. To lower error rates due to signal noise.

If none of your gear has a grounded plug avoid using shielded cables or connect some grounding alligator clamps at the ends.

Using shielded wires over short distances might be overkill but it should provide peace of mind when buying expensive network gear!

UPDATE:
Model 'PowerConnect 8164' is a grounded network gear with grounded sockets.
You'll recognize a grounded socket if it's also encased in a metallic sheet.
If the switch's chassis is connected by a grounding wire to the rack, means the switch itself can be grounded. (if it would have only plastic RJ45 sockets that would't protect it's insides by some discharge travelling over the wire, not your case)

A grounded plug has a metal casing over the normal plastic plug (you connect the 9th wire aka. 'ground' to it by bending it over the jacket).

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