Brian Reay wrote:
Jimk wrote:
Wrote in message:
On Sunday, 3 May 2020 15:41:00 UTC+1, JimK wrote:
I bit the bullet & ran some network cables revently
to get away
from using power line plugs.
I had some long patch cables in stock so threaded those through.

One through a gigabit switch, serves 2 raspberry pis running cctv .

When connected by dlink300av powerline adaptors the data
throughput seems higher than the new cable, with smoother
playback of recorded events & no lag.

Switch to the cable & it's very different & slower.... I was
hoping it would be at least as good if not quicker?

(The cable is in reality two CAT5 patch cables joined with a
straight through connector. Initially with a moderately priced
cat6 labelled connector it didn't work, with a cheapo but still
called cat6 connector it does, sort of, see above).

Next steps to resolve please?
TIA
Check that all eight conductors are present and connected. Some
patch cables only have two pairs fitted and will only operate at
100Mbit/s. Similarly, a broken conductor may cause the connection
to operate at 100Mbit/s.
John

Any way to check that without taking them out again?

You can buy a simple tester for a fairly modest amount.

The basic ones typically have a detachable dongle you stick at the remote
end and you plug the tester in at the other end. They check all 8
conductors are connected and not crossed over etc.

(You can get smart ones which check bandwidth etc but they cost serious
money- not the kind of thing a hobbyist would normally have.)

A very few computers, had a built-in tester. It used TDR
and could detect shorts and opens. And also give a
distance to the fault. Some Marvell GbE network chips
had this. The machine I got it on, had a dirty RJ45, with
solder flux deposits on one wire of the connector,
and I got to use the test feature right away. It could
tell me "one pair is open", because the pin could not
make contact.

To use the feature, you connect the computer to your
router, with a cable. Turn off the power to the router
(so it cannot interfere with the TDR operation). Then
run the test, and it'll tell you the status of the pairs
and the wire.

https://web.archive.org/web/20030320...hite_Paper.pdf

Paul