Re: internet outages
On 12/23/2018 04:24 PM, David Christensen wrote:
On 12/23/18 12:11 PM, rhkramer@xxxxxxxxx wrote:
On Sunday, December 23, 2018 02:50:34 PM David Christensen wrote:
On 12/23/18 2:02 AM, Curt wrote:
On 2018-12-22, David Christensen <dpchrist@xxxxxxxxxxxxxxxx> wrote:
1. Test and verify your network cables:
I think in my particular home situation I'd rather just replace my 10
dollar ethernet cable with a new one (or swap in a new one to see
makes some appreciable difference) than purchase an $80 device to test
whether it's failing or not (in which former case I'd then be out $90,
which is a real nice load of money).
If you own a continuity tester or multimeter, you could build a pair of
RJ-45 jacks with pigtails for a few dollars and use those to test your
Wow, for $80 I would have expected something that would measure dB
maybe even a time domain reflectometer (well, maybe not that).
Please provide a URL for such test instrument(s).
One other point -- MRSP is not the same a street price:
I have seen those continuity type testers on ebay for under $10 (the
with two devices, both with RJ-45 jacks, you plug the ends of the
those (one at each end of the cable), and then the "master device"
whether the pairs are connected properly and there is continuity).
I am sure there are cheap clones and/or counterfeits of the LinkMaster
available. I prefer genuine, reputable brands.
RE: Time Domain Reflectometer:
Theoretically, you can build your own with a fast pulse generator and an
oscilloscope. The trick is, you need a REALLY FAST oscilloscope! The
pulse generator is easy, just a couple of transistors, maybe a diode.
The circuit is probably in every edition of the Radio Amateur's
Handbook. The scope is expensive. If you don't have at least a 1GHz
digital sampling scope, don't bother!
--doug, WA2SAY, retired RF engineer