Cat 5e U-UTP Twisted Pair Not Syncing to 1 Gbps on Windows 10

Hi.
I bought such a cable on Allegro allegro.pl/pirect-kabel-utp-lan-skretka-kat-5e-50m-0347-i5196143196.html
As I received the parcel, I clamped both ends with the RJ45 plug. in accordance with TIA 568B.
I check with a tester, everything is properly done.
I connect it to two computers, the first thing I notice in Windows 10 is that it detects the connection after a few seconds, I go to the property and only 100 Mbps there.
At 50m it should be Gigabit. The twisted pair passes the test correctly on the tester.
What is going on?

1. Poor cable.
2. Do not let go of electric wires nearby.
M.

Hello,

Did you make a cross cable to connect the computers?

If so, for 1GB connection, you need to swap not only the orange and green pairs, but also the blue and brown pairs.

greetings
Andrew

Usually, a patch cable is defined as a ready-made cable with a standard length (1, 2, 3, 5 m), terminated on both sides with terminals compliant with the technology,

@cefaloid
I didn't think there could be such big differences between the cables. However, I only bought the cable to repeat the crimping before the exam.
@ Andrew75
Yes, I made a patch cord.

Quote:

If so, for 1GB connection, you need to swap not only the orange and green pairs, but also the blue and brown pairs.

In fact, I made a mistake, so far I was convinced that one plug in the T568B standard and the other in the T568A standard is enough and there is already a patch cord.

Did you do it like this:

Crap cable. Get something decent. And don't play patching because it's 2018.

Hello,

Once again,
100MB patch cord
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1GB patch cord

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or yes


greetings
Andrew

cefaloid wrote:

Allegro is a mecca for Janusz's who sell Chinese fakes.

It doesn't matter if it's a software license, phone charger or ethernet cable. Allegro = you bought a counterfeit and stuffed Janusz's cabbage.

CCC = price works wonders. When you buy goods for a fraction of the price of decent equipment, it's hard to expect miracles.

At 50 meters, sometimes, and with FastEthernet, miracles happen on such cables.

drobok wrote:

for such a long distance you should buy cat6 cable, for 50m utp5e it is lottery.

Not true.
Cat 5 MUST run up to 100m (more in practice).
What's more, my 20-year-old kat5 installation works on gigabit because it "forgot" that it was not supposed to work.
Only there were no strange compromises and the assembly was correct (sockets and panels, not plugs, and only millimeter-long plating on these panels).
Bad ballerina ...

For posterity, a few words from physics / information theory.
one concept is the difference in "analog" frequency and the possibility of superimposing a higher / lower bit rate on it.
According to Shanon, in schools it is interpreted as a religious principle that to transmit N bits / s you need 2xN hertz. Almost like this.
Except that a gigabyte would never be.

However, with high channel quality (noise, phase shifts), you can push more bits than hertz through multiple modulations, subtly modifying the phase, level (professionals forgive the simplifications). This is how gigabit ethernet is realized.

The pairs in the twisted pair are not pairs of two wires that can be detected with an ohmmeter. In other words, any two wires are not a pair.
These are specific pairs, with a specific weave, with very well-defined high-frequency parameters.

Earning plugs, too long untangling twisted cables and many subtle factors (I'm not talking about Chinese cables, because it's obvious)

Added after 56 [seconds]:

cefaloid wrote:

It follows from the above, that gigabit ethernet not only detects the order of pairs in the cable as if we did not twist it wrong there ... but also polarities in case some genius "crossed" the wires within a pair.

not true. Excessive mental shortcut

Added after 1 [minutes]:

cefaloid wrote:

2. For over 10 years (!) The test has been used Auto MDI-MDIX technology, so whether the cable is straight or crossover does not really matter.

true (although rarely devices will go crazy on some makeshift cables)

Added after 3 [minutes]:

Andrzej75 wrote:

If so, for 1GB connection, you need to swap not only the orange and green pairs, but also the blue and brown pairs.

NOT TRUE.
And it is of great importance.

Structured cabling (as understood by professionals) can be fully used for telephony. On your idea, on the first ring, there is smoke coming from the ethenrnet card.
The newer inventions (not yet standardized) include PoE power.
False rumors about cables should not be tolerated
(Historically, before the Auto MDI-MDIX era, ONLY orange to green pairs were patched. Blue was ALWAYS middle and Christmas.)

Added after 9 [minutes]:

geniusm wrote:

At 50 meters, sometimes, and with FastEthernet, miracles happen on such cables.

Miracles are and happen on 15-20m of a badly assembled cable (e.g. pairs understood as an ohmmeter)

Added after 3 [minutes]:

SP5IT wrote:

1. Poor cable.
2. Do not let go of electric wires nearby.
M.

1. I will agree
2. (very) little it matters

JacekCz wrote:

On your idea, smoke goes from the Ethernet card on the first ring.

I think my colleague confused the topic, I read a similar one, to which this sentence would fit.
Link

I had a similar case, I actually have a whole carton of this case ^^
My ex-company bought a package of some Chinese cable with an aluminum core (CCA), to my surprise the cable worked 1Gb up to some 10m, then only 100Mb / s (but only with a fast Ethernet device on one side).

On my tester (Flule LRAT2000), it showed the transitions and the correct construction of the cable, but only 2 pairs showed the correct cable length, the rest were

cefaloid wrote:

JacekCz wrote:

cefaloid wrote:

It follows from the above, that gigabit ethernet not only detects the order of pairs in the cable as if we did not twist it wrong there ... but also polarities in case some genius "crossed" the wires within a pair.

not true. Excessive mental shortcut

I would advise you to read the links I have provided before listing these types of theses.

Unless a colleague questioned the sentence:

The receiver uses the sequence of symbols during the training sequence to detect and correct for pair polarity swaps.

I would like to remind you that the links lead to IEEE documents and this is a bit higher authority ...

We will not fight
According to my knowledge (interpretation ???), the polarity of the wires in a pair is essentially indifferent *) due to the modulation method. Which does not mean that we say it out loud, because the dwarfs want to go crazy. That it is defined and controlled is like a "higher requirement", but we are in some sense secured.

I just refreshed myself, for 1000BASE-T the base frequency is ("just" guided by school signal theory) 125MHz, and there are 4 (plus 1 = 5) voltage levels. It is also double-sided. High voltage and phase precision **)

*) I ignore that the precise waveform measurement of the cable as a whole would also suffer on other pairs.
**) modulations of this type are present in various applications, it is worth getting used to.

Hmm

0.40 PLN / m ??? It cannot be a Cat 5e cable.
Of course, the Chinese wrote this on the packaging (or the drum) and the seller wrote so in the auction because he has half the magazine of this g ... na.

Cat 5e U / UTP cable is now around 1 - 1.40 PLN / m gross. If we add a screen (mesh, foil) to it, it will only be more expensive.

The producers are at least some MADEX, FIBRAIN, ALANTEC.

The first fundamental question nobody asked was whether there are gigabit cards in both computers (why 2 computers and not a switch and 2 computers?) then first. Another thing is organoleptic check of the cable to make sure that the veins are not attracted by a magnet, scratch the bare core with a knife and check if there is a silver center (copper-plated steel or aluminum).

The seller describes this twisted pair quite twisted, but nowhere has it written that it is 100% copper, so no wonder. Once I fell for the super CCA twisted pair, and I found out only during the startup, when on 100Mbit I had a problem with the operation of the network at distances of 40-50 meters.

I agree 100% with my colleague @JacekCz , no need to cross, just connect 1: 1. And the price of a good twisted pair in solid copper does not have to be over PLN 1. If you have a good source, you can buy it in the range of PLN 0.60 - PLN 0.70, but you need to have it and earn discounts.

Correctly made CCA is also not so bad, many backbone installations were created on the CCA and operate on 1Gb.
I was forced to work on it a few times and the cables were certified, if nobody touches it, they work quite well.
I haven't seen a twisted pair on a steel core yet, but I can believe it.

Well, I had a twisted pair that made the magnet stick to the wire.