cross connect reliability
sethm at rollernet.us
Mon Sep 21 06:48:56 UTC 2009
Luke S Crawford wrote:
> Richard A Steenbergen <ras at e-gerbil.net> writes:
>> You've never seen a single port go bad on a switch? I can't even count
>> the number of times I've seen that happen. Not that I'm not suggesting
>> the OP wasn't the victim of a human error like unplugging the wrong port
>> and they just lied to him, that happens even more.
> I know it happens; it's happened to me, and I have probably touched fewer
> switches than you. Still, from what I can understand, it can be
> prevented/minimized by the use of a grounded port.
> "CAUTION: If you want to install the Switch using a Category 5E or
> Category 6 cable, 3Com recommends that you briefly connect the cable
> to a grounded port before you connect to the network equipment. If you
> do not, the cable’s electrostatic discharge (ESD) may damage the Switch's
> You can create a grounded port by connecting all wires at one end of a
> UTP cable to an earth ground point, and the other end to a female RJ-45
> connector located, for example, on a Switch rack or patch panel. The
> RJ-45 connector is now a grounded port."
HP chassis switches ship with a grounding jack accessory you attach to
the DB9 port (I assume it ties all RJ-45 pins to shied/ground)
explicitly for this purpose. The instructions say to always plug a cable
into the grounding device before connecting to a switch port.
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