Listen to Dale; I've been to his shop (when he was still there) in Cedar
Rapids. Interesting days.
The connector is typical of its type. Be sure it is actually making
contact in the shielded receptacle and that the foil shield (you won't
find braid in a civilian product) all the way around and to a conductive
surface of the braid; I've seen off-the-shelf cable with connectors
assembled to the insulated side of a Mylar-aluminum shield.
FWIW department; military stuff is orders of magnitude harder to do than
civilian. A military product I worked on a few years ago someone had
fondly and optimistically designed with Ethernet routed on
multi-conductor connectors (though using an otherwise well shielded
quadraxial cable). They were repeatedly told not to -- and not just by me.
The design had to be changed to shielded quadrax all the way down to the
card level, and the connector to MIL-38999 with quadrax inserts
(example:
http://eccochicago.com/wp-content/inventory_images/Amphenol%20Quadrax%20Contacts.png
). Be warned.
The router is another problem. That one is a Class A device and
certified at an RF level three times higher than a Class B device meant
for residential use. Reference to "for residential use" in the
installation istructions is contradicted by the class for which it is
certifed both in the FCC-required wording and the EN 55022 Declatation
of COnfromity.
From the installation instructions at
ftp://downloads.netgear.com/files/FS116_IGprt_16Dec09.pdf :
*Federal Communications Commission (FCC) Compliance Notice: Radio
Frequency Notice*
This device complies with part 15 of the FCC Rules. Operation is subject
to the following two conditions:
. This device may not cause harmful interference.
. This device must accept any interference received, including
interference that may cause undesired operation.
Note: This equipment has been tested and found to comply with the
limits for a Class A digital device, pursuant to
Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interferences in
a residential installation....
*EN 55 022 Declaration of Conformance*
This is to certify that the NETGEAR Model ProSafe^(TM) 16 Port 10/100
Switch with 8 Port PoE FS116P is shielded
against the generation of radio interference in accordance with the
application of Council Directive 89/336/EEC,
Article 4a. Conformity is declared by the application of EN35 022 Class
A (CISPR 22).
Cortland Richmond
KA5S
On 3/2/2013 1820, Jeff Stevens wrote:
Thanks to everyone who has contributed to the discussion on the use of
shielded twisted pair. I'm interested in what folks think about connection
of the following devices in regard to providing a circumferential shield.
They are a fairly good representation of what is easily available 'off the
shelf' (and at reasonable cost) to the home user.
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