From yahoo Sent Tue, Jan 2nd 2018, 15:28
From yahoo Sent Tue, Jan 2nd 2018, 15:28
> Most network cabling is UTP (Unshielded Twisted Pair), Shielded Twisted
> Pair (STP) is not very common.
>
> STP Cat6 (or Cat5e) is sometimes used in datacenters but I've not seen
> it elsewhere.
>
> Shielded RJ45 connectors have a metal cage, making it easy to recognise:
>
>
https://rubimages-liberty.netdna-ssl.com/hi-res/RJ45-STP-L5E_connector_45deg
ree.png
>
> Martin
Thank's for the note.
I took a look at Wikipedia to learn a bit more about these cables. According
to Wikipedia it's a bit more complicate and several types of these cables
are available. One has to distingish between the common shield for all wires
and the shields for each pair. The shield can be a metal foil (abbreviation
F) or mesh wire (abbreviation S) or unshielded (abbreviation U). The
character before the "/" identifies the type of common shield, the first
character after the "/" identifies the type shield for the pairs of wires,
e.g.
U/UTP: totally unshielded (not suitable for A-180-9)
S/UTP: common shield for all wires (mesh wire)
U/FTP: separate shield (foil) for each pair, no common shield
S/FTP: separate shield (foil) for each pair and common shield (mesh wire)
F/FTP: separate shield (foil) for each pair and common shield (foil)
All network cables I could find here in Germany (CAT5 or CAT6) had a common
shield. That's why was not aware that unshielded cables are available at
all.
For the A-180-9 all cables with common shield are suitable (i.e. S/UTP,
S/FTP, F/FTP and SF/FTP). Only U/UTP is not suitable for A-180-9. I'm not
sure if U/FTP will work as it depends upon if and how the single shields are
wired to the connectors.
Best whishes
Dieter Doepfer
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