RJ45/Ethernet connection issues after changes
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MartinLRZ
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MartinLRZ Posted messages 8 Status Member -
MartinLRZ Posted messages 8 Status Member -
Hello,
I'm facing a problem today following a change of Internet Service Provider.
Indeed, after being with Orange for over 3 years, I decided to switch to SFR (RED) to take advantage of lower prices.
For your information, here is my installation that was working correctly for over a year and a half:
I never encountered any operating issues, and the speed was fine (never any latency or anything).
However, yesterday, after the arrival of the SFR technician, I reproduced exactly the same installation but I found that there is no network at the box level.
To test the box and my "extension" cable between the basement and the first floor, I made the installation below:
It turned out that everything was working correctly, both internet on the PC connected directly to the Box, and on the TV, with "extension" RJ45 between the two devices.
I don't see at all what could be causing this operational problem and am therefore seeking your insights.
For your information, all my Ethernet cables are 568B and straight.
I also reused the same Ethernet cables as with my "Orange" installation.
Thank you in advance for your help!
Configuration: Windows / Firefox 61.0
I'm facing a problem today following a change of Internet Service Provider.
Indeed, after being with Orange for over 3 years, I decided to switch to SFR (RED) to take advantage of lower prices.
For your information, here is my installation that was working correctly for over a year and a half:
I never encountered any operating issues, and the speed was fine (never any latency or anything).
However, yesterday, after the arrival of the SFR technician, I reproduced exactly the same installation but I found that there is no network at the box level.
To test the box and my "extension" cable between the basement and the first floor, I made the installation below:
It turned out that everything was working correctly, both internet on the PC connected directly to the Box, and on the TV, with "extension" RJ45 between the two devices.
I don't see at all what could be causing this operational problem and am therefore seeking your insights.
For your information, all my Ethernet cables are 568B and straight.
I also reused the same Ethernet cables as with my "Orange" installation.
Thank you in advance for your help!
Configuration: Windows / Firefox 61.0
3 answers
Hello
What is the "fiber box" and the "internet box"?
What has been replaced by changing ISPs?
A priori, I would think it’s a wiring issue.
Pairing issues, problems with one pair, which can affect some equipment and not others.
--
There are 3 kinds of people: those who can count and those who can't.
There are two categories of people: those who divide everything into two categories and the others.
What is the "fiber box" and the "internet box"?
What has been replaced by changing ISPs?
A priori, I would think it’s a wiring issue.
Pairing issues, problems with one pair, which can affect some equipment and not others.
--
There are 3 kinds of people: those who can count and those who can't.
There are two categories of people: those who divide everything into two categories and the others.
It would be a good idea to check the wiring.
Maybe visually, at first.
Crossed cables would be of no use.
--
There are 3 kinds of people: those who can count and those who cannot.
There are two categories of people: those who divide everything into two categories and the others.
Maybe visually, at first.
Crossed cables would be of no use.
--
There are 3 kinds of people: those who can count and those who cannot.
There are two categories of people: those who divide everything into two categories and the others.
I just went to buy a cable tester and did the tests, but I don't know how to interpret them.
Numbers 4, 7, and 8 are not blinking; unlike the others.
But I find it strange that it's an odd number. This probably means there hasn't been an inversion.
And do you know why it was working correctly with Orange?
Do ISPs have different "protocols"?
Numbers 4, 7, and 8 are not blinking; unlike the others.
But I find it strange that it's an odd number. This probably means there hasn't been an inversion.
And do you know why it was working correctly with Orange?
Do ISPs have different "protocols"?
I used this one:
https://www.castorama.fr/testeur-rj45-erard/3700101224981_CAFR.prd
So should I redo the connections of the two RJ45 sockets?
https://www.castorama.fr/testeur-rj45-erard/3700101224981_CAFR.prd
So should I redo the connections of the two RJ45 sockets?
Start by testing a cable that you believe to be correct, such as one provided with the box.
This will give you an idea of the tester's functioning on a good cable.
Then, use this/these correct cables to test the distribution.
Finally, if there is an anomaly, redo the wiring.
Often, it can come from a problem with the crimping of the cable in the connectors.
Also, if you have used stranded cable for the distribution, it can cause issues with wall sockets, which are designed for solid cable...
This will give you an idea of the tester's functioning on a good cable.
Then, use this/these correct cables to test the distribution.
Finally, if there is an anomaly, redo the wiring.
Often, it can come from a problem with the crimping of the cable in the connectors.
Also, if you have used stranded cable for the distribution, it can cause issues with wall sockets, which are designed for solid cable...
Hello,
What you call a fiber box is referred to as an ONT, optical network termination, in jargon.
So far, they have been separate from fiber boxes, but they are increasingly being integrated (miniaturized into SFPs), so they are likely on their way to extinction.
You should already know that a basic cable tester will not show you a pairing issue; a visual inspection is required in this case or a much more sophisticated and a thousand times more expensive device: a cable certifier.
But,
given your indicators already, it’s not great: the 8 indicators and possibly the shielding wire should blink alternately.
With a cable tester, you must first test... your test cords, both of them, and if they're okay, then test the cable.
The 8 or 9 indicators should blink one after the other from each end, but visualizing just one side is sufficient.
If only 1, 2, 3, 5, 6 are blinking, you can only do 10/100 Mbit/s Ethernet which only requires pairs 1, 2 and 3, 6 but not gigabit which requires all 4 pairs, thus 4, 5 and 7, 8 extra, normal wiring.
Plus a visual inspection for the pairing: the orange pair on 1, the green pair on 3, the brown pair on 7, the blue pair on 5:
If the defect is confirmed, your cable would work at 100, but not at gigabit, what surprises me is that Orange's fiber settled for a 100 Mbit/s connection before, hello the handicap.
A or B doesn't matter as long as it's the same at both ends.
If you have A on one end and B on the other, you make a crossover cable.
Finally,
If you rewire your sockets, shorten your wires by 2 or 3 mm so that the CAD (self-stripping contacts) don't cut at the same spot, otherwise, you’re guaranteed a bad contact.
What you call a fiber box is referred to as an ONT, optical network termination, in jargon.
So far, they have been separate from fiber boxes, but they are increasingly being integrated (miniaturized into SFPs), so they are likely on their way to extinction.
You should already know that a basic cable tester will not show you a pairing issue; a visual inspection is required in this case or a much more sophisticated and a thousand times more expensive device: a cable certifier.
But,
given your indicators already, it’s not great: the 8 indicators and possibly the shielding wire should blink alternately.
With a cable tester, you must first test... your test cords, both of them, and if they're okay, then test the cable.
The 8 or 9 indicators should blink one after the other from each end, but visualizing just one side is sufficient.
If only 1, 2, 3, 5, 6 are blinking, you can only do 10/100 Mbit/s Ethernet which only requires pairs 1, 2 and 3, 6 but not gigabit which requires all 4 pairs, thus 4, 5 and 7, 8 extra, normal wiring.
Plus a visual inspection for the pairing: the orange pair on 1, the green pair on 3, the brown pair on 7, the blue pair on 5:
If the defect is confirmed, your cable would work at 100, but not at gigabit, what surprises me is that Orange's fiber settled for a 100 Mbit/s connection before, hello the handicap.
A or B doesn't matter as long as it's the same at both ends.
If you have A on one end and B on the other, you make a crossover cable.
Finally,
If you rewire your sockets, shorten your wires by 2 or 3 mm so that the CAD (self-stripping contacts) don't cut at the same spot, otherwise, you’re guaranteed a bad contact.
And the internet box is the box that provides the Wi-Fi, and to which I connect the TV decoder.
Only the fiber boxes, internet box, and TV decoder have been replaced following the change of ISP.
Do you think that the RJ45 connectors of the SFR boxes are wired in category A, while the cables are in 568 B?
The question doesn't arise like that.
The 568 A or B wiring is a standard regarding the pairs used in the cabling, not in the equipment.
If in the cabling, you have untwisted two pairs (a regrettable pleonasm), it can cause problems.
For example, 1-white/orange 2-orange, 3-white/green 6-green, etc.
If you have: 1-white/orange 2-green, 3-white/green 6-orange, etc.
It might work, but could cause issues.
Similarly, a problem on pairs 4-5 or 7-8 might still allow operation at 100 Mbps, but not at gigabit.
These are examples of potential cabling issues...
It is true that when I installed my internet box directly to my fiber box (second photo), the PC connected to the extended RJ45 had very low speeds (about 90 mb/s down) while I normally have 1Gb/s.
If there was a wiring problem, would it be possible to use crossover RJ45 cables to fix the issue?