New answers tagged

3

USB C is a dense pinout connector and Power Delivery requires more than just the "standard" USB 2.0 pins of Data+, Data-, 5V and GND. From EE: How does a USB C port provide the power to charge laptops? you can see that the CC1/CC2 pins beside the D+/D- pins are used to communicate for USB PD. This is the main reason why Power Delivery does not ...


-2

Don't use crimped ends. Period. Won't certify (yes, there are exceptions to every rule, depending on length, and actual RF/ Radiation interference) CAT6/ CAT6a. Use keystone jack's, and patch cables to your desired/ required bandwidth.


0

RJ45 connector itself can impact the link. Be careful that there is some for single-stranded, multi-stranded copper pairs. There is rj45 for cat5e cat6 cat7 ....


2

Adding a switch in the middle to boost the signal worked for me. However, I am still only getting +-870 mbps when testing with iperf3 between 2 PC's but that's more than good enough for me. This is the current layout of everything:


4

Your question says you have an "80 meter" cable, but the evidence you provide suggests you have a 15 meter cable and a 65 meter cable. If you know the 65 meter cable doesn't work at 1Gbps, adding couplers to the ends of it or attaching the 15 meter cable will not make it better. As another answer states, if the 65 meter cable has been outside and ...


1

You say the plugs support solid-core cable, which implies you've used solid core cable. Is there anywhere in the cable path that is unsupported? I've found that any flex at all allows solid core cable to fail internally. Sometimes people use solid core because its marginally cheaper, and is a lot easier to put into plugs before crimping. This is false ...


0

The "G" typically refers to the shield connection (labelled "Drain Wire" and "Aluminium Mylar Shield" below)... i.e: not any of the data pairs. If you're not using CAT-6 or better with appropriate connectors and termination throughout the run, then this will not test out and will appear "open circuit". For CAT-5e ...


7

This cable has been outside in the weather. Unless you live in the Atacama Desert, rain water has had a chance to penetrate any slight break in the jacket, such as from a kink, and you could now have water at random locations inside the jacket surrounding the insulated conductors. The water has a higher capacitance than the air that is normally inside the ...


29

Ethernet auto-negotiates using (low-frequency) link pulses. It does not check or train the cable. Link pulses are exchanged on the two 10/100 pairs and for 1 Gbit/s, all four pairs do an additional link check each. Some Ethernet devices may fall back to 100 Mbit/s when 1000 Mbit/s has been negotiated but fails to link due to one or two missing pairs - 1 Gbit/...


15

You have a lot of variables here: To get 1Gbit ethernet you need all 4 pairs of the cable that have no faults and are OFC [Oxygen-Free Copper]; any extenders, joins, or couplers are going degraded the signal (to get 100Mbit, you only need 2 pairs working well). A better solution may be to use fiber and a fiber media converter at each end, as it negates the ...


1

I tested many cables. The majority had USB trident but over half would not do data. Of those that do data, most would not do data in all my tests. The only cables I have that do data in all situations have two physical characteristics. Longer edge pins. Extra grooves above all pins. In this photo the top cable does data only in some situations. The bottom ...


3

There is no difference between straight and angled SATA cables. (If with angled you mean having 90 degree angled connector at one or both ends). But bending a SATA cable in a too tight bend (e.g. wrapping it around your finger) may damage it. Even though it may still make electrical contact and has no visible damage it is possible it doesn't support high-...


4

SATA connections are highly susceptible to being put under any pressure at all; they can cause all sorts of weird issues, from bad I/O to the drive not being recognised at all. Get a can of contact cleaner, douse plugs & sockets liberally [with the power completely off & allow good time to dry], then try again - using whichever cable puts least or no ...


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