On Tue, 29 Jan 2002, Shaul Karl wrote:
> Can you express your view on the subject and/or give some online
> pointers?
>
> In particular, I plan to put an Ethernet cable between 2 apartments
> such that it will path in parallel to the cable TV outside of the
> building. There fore, in addition to possible cross talk with the cable
> TV, what about the danger of a lightning hitting the cable?
cable tv is coax, so no crosstalk.
Unless you connect the shield to ground on both ends, you risk lightning
shock. note that 10B2/10B5 are VERY sensitive to lightnings.
>
> Suppose I will put a shielded cable and have it go to a wall outlet.
> Having it tied to the electricity ground (green/yellow wire) is a major
> pain, which is why I plan to have it connected to the computer chassis
> by a shielded Ethernet cable _only_ when a PC is actually connected to
> this wall outlet. Is this a good policy as far as a lightnings are
> concerned?
wouldn't a better strategy be to use shielded sockets in the nic, and
shielded rj45 connectors?
> Can one claim that the twisted pair structure of an Ethernet cable and
> the cable TV itself being shielded is an adequate protection against
> cross talk between the cable TV and the Ethernet cable?
Yes
>
> As far as I can tell the phone (Bezeq) lines that are going from each
> apartment to the building's central phone box are unshielded even with
> old building where Bezeq needs to have them path on the outer walls of
> the building. Am I right about these cables being unshielded? If yes,
> what about protecting the phone equipment from lightnings?
> --
They are not protected (guess they are on the PBX side). I had a phone
socket burnet once from a lightning.
>
> Shaul Karl
> email: shaulka(at-no-spam)bezeqint.net
> Please substitute (at-no-spam) with an at - @ - character.
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>
>
>
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Dani
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