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How to resolve Home Network Speed Issue 100mbp on a port? Probably Cable but...

Rizwan

Occasional Visitor
In a nutshell my main router [R] is in my office downstairs (now an Asus Ax86u Pro)
When we 1st moved into the house a decade a go I asked an electrician to run a 20m Cat5 cable from here to the loft (2 floors up) which I terminated to a gigabut switch
From that switch (S) I had him do cable drops to each bedroom as a future proofing "just cos"
I only really used it in 1 bedroom where I used the ethernet port to service a Wifi Access Point
In truth the wifi has been rubbish upstairs for ages but it was always a "will sort it when I go Mesh"

Since I got the AX86u I moved my older Asus AC86u to the same bedroom as my AI Mesh [M]
Mesh has been up for a couple weeks and I spotted wifi is only 92MB upstairs and so looked harder and I see:
The [R] port where the cable to the loft is plugged into shows 100MB (ie "yellow)
In the loft at the (S) port also shows yellow both for this cable FROM downstair but also the cable that runs TO the bedroom/Mesh router
The [M] port also shows yellow/100MB

All other ports on Router all Green/Giga
Moving the loft cable to another post makes that yellow
Moving cable in the loft to another one still yellow (the one to CCTV is green)
The cable from (S) to [M] is showing yellow/slow at both ends and the Mesh connection reads "okay" not "great"

I brought [M] downstairs and cabled it directly to same ports on [R] and both went green "great" connection

SO
1. Will a cable show as slow speed at BOTH ends if the terminal at one end is not terminated properly
2. The run from (S) to [M] is basically the WAN for the Mesh so if it is throttled at (S) that means it will be max 100mb at mesh right? rather than necessarily meaning that cable is also shonky? Im not sure about this as the CCTV ethernet from (S) to PVR shows green on the Switch but the one to the Mesh yellow

I am just trying to understand if I need to try to snip and re-terminate the long cable to the loft at both ends or try 1 at a time (ditto impact for the other cable drops to the bedrooms)
Other option if the cable is damaged in the long run somewhere (it is only 10-20m max) is to work out how I can do another run from my office perhaps to the bedroom immediately upstairs and move the Mesh here (although it reduces the benefit as current locaiton is diametrically opposite location in house so best for wifi coverage)
One floor up might is managable - how to get it from bedroom to loft will be much more difficult as current cables are trunked in unless I sacrifice the drop from loft back down to this bedroom to use it to pull a long cable up from office to the loft as it travels via this bedroom but it is now very messy and boarded in the loft a decade later - switch in Loft is needed for some devices and the drops to the other bedrooms

Sorry this reads so convoluted
 
In a nutshell my main router [R] is in my office downstairs (now an Asus Ax86u Pro)
When we 1st moved into the house a decade a go I asked an electrician to run a 20m Cat5 cable from here to the loft (2 floors up) which I terminated to a gigabut switch
From that switch (S) I had him do cable drops to each bedroom as a future proofing "just cos"
I only really used it in 1 bedroom where I used the ethernet port to service a Wifi Access Point
In truth the wifi has been rubbish upstairs for ages but it was always a "will sort it when I go Mesh"

Since I got the AX86u I moved my older Asus AC86u to the same bedroom as my AI Mesh [M]
Mesh has been up for a couple weeks and I spotted wifi is only 92MB upstairs and so looked harder and I see:
The [R] port where the cable to the loft is plugged into shows 100MB (ie "yellow)
In the loft at the (S) port also shows yellow both for this cable FROM downstair but also the cable that runs TO the bedroom/Mesh router
The [M] port also shows yellow/100MB

All other ports on Router all Green/Giga
Moving the loft cable to another post makes that yellow
Moving cable in the loft to another one still yellow (the one to CCTV is green)
The cable from (S) to [M] is showing yellow/slow at both ends and the Mesh connection reads "okay" not "great"

I brought [M] downstairs and cabled it directly to same ports on [R] and both went green "great" connection

SO
1. Will a cable show as slow speed at BOTH ends if the terminal at one end is not terminated properly
2. The run from (S) to [M] is basically the WAN for the Mesh so if it is throttled at (S) that means it will be max 100mb at mesh right? rather than necessarily meaning that cable is also shonky? Im not sure about this as the CCTV ethernet from (S) to PVR shows green on the Switch but the one to the Mesh yellow

I am just trying to understand if I need to try to snip and re-terminate the long cable to the loft at both ends or try 1 at a time (ditto impact for the other cable drops to the bedrooms)
Other option if the cable is damaged in the long run somewhere (it is only 10-20m max) is to work out how I can do another run from my office perhaps to the bedroom immediately upstairs and move the Mesh here (although it reduces the benefit as current locaiton is diametrically opposite location in house so best for wifi coverage)
One floor up might is managable - how to get it from bedroom to loft will be much more difficult as current cables are trunked in unless I sacrifice the drop from loft back down to this bedroom to use it to pull a long cable up from office to the loft as it travels via this bedroom but it is now very messy and boarded in the loft a decade later - switch in Loft is needed for some devices and the drops to the other bedrooms

Sorry this reads so convoluted
Just to add I did use a network tester for the cable from loft to mesh and it seemed fine (1-8 synched fine on the tester); didnt manage from office to loft as cant see/hear although might try with mobile phones and 2 people but will it necessarily show which end is problematic?
 
Most likely the cable is fine. Replace the connectors on both ends and try again.
 
Is the slow link rate following the cable or the port(s) on a device ?
How loose is the fit of the plug into the device port ? Does wiggling change anything ? Port dirty ?
If you have narrowed it down to a cable run, do what Tech9 suggested.
 
Is the slow link rate following the cable or the port(s) on a device ?
How loose is the fit of the plug into the device port ? Does wiggling change anything ? Port dirty ?
If you have narrowed it down to a cable run, do what Tech9 suggested.

Thanks - plugs are a tight fit
I tried different ports too - on the router moved a "green" connection to the "yellow" loft connection the port colours swapped so ports themselves are fine
I did try to clean the terminations and ports even so but no difference

It would be odd for all 4 terminations to be an issue though no? ie router to switch and switch to mesh (other than my rubbish crimping skills of course)
 
Older network, connection issues - two things usually fix it:

- ports inspection and cleaning
- cable connectors replacement
 
Thanks - plugs are a tight fit
I tried different ports too - on the router moved a "green" connection to the "yellow" loft connection the port colours swapped so ports themselves are fine
I did try to clean the terminations and ports even so but no difference

It would be odd for all 4 terminations to be an issue though no? ie router to switch and switch to mesh (other than my rubbish crimping skills of course)
Might also be the crimping tool/terminals. If you bought/borrowed the cheapest one, may be time for an upgrade if the first round of re-crimping doesn't improve things.
chuckling to myself, been there, done that. several times and issue followed ....




me :eek:
 
Might also be the crimping tool/terminals. If you bought/borrowed the cheapest one, may be time for an upgrade if the first round of re-crimping doesn't improve things.
chuckling to myself, been there, done that. several times and issue followed ....




me :eek:
It's been a LONG time since I terminated any cables so panicking when I do I'll screw it up and make it even worse 🫣🤣
 
Unless you are using a TDR you can't tell one end from another. The regular testers one buys are just continuity testers. They don't tell you anything about the quality of the connection.

i'll answer this way - will a tree fall if the trunk is cut from the left or the right side ?
 
Fair
Yeah I assumed it was a continuity tester but I meant more in terms of (say) the terminal at the switch was shonky would it still show as slow speed downstairs at the router?
 
the link sync rate will show the same on both ends as that was all the electrical protocol could negotiate between the two ports. Doesn't matter where the defect is in the path.
 
Thanks
Makes sense also
Im hoping obviously I replace 1 terminal and magically it propagates all the way up and across 😁
50/50 chance of picking the right one 🫣
 
I did that already between the 2 routers and both ports pinged green same for the switch which I swapped out anyway for a new one
 
Sounds like the electrician wired the connectors like POTS. May be best to get CAT5 or CAT6 surface mount boxes to terminate the cables and use patch cords to connect to the switch, router and node. I find it easier to punch down solid wire cable than to crimp male plugs. Invest in a punch down tool as well. I get Monoprice CAT6 RJ45 surface mount box from Amazon.

Edit POTS is plane old telephone service.
 
Sounds like the electrician wired the connectors like POTS. May be best to get CAT5 or CAT6 surface mount boxes to terminate the cables and use patch cords to connect to the switch, router and node. I find it easier to punch down solid wire cable than to crimp male plugs. Invest in a punch down tool as well. I get Monoprice CAT6 RJ45 surface mount box from Amazon.

Edit POTS is plane old telephone service.
 
TBF he just did bare wire cable drops
I did all the terminations myself
Crimping ends at router and all the ones in loft

In the bedrooms I terminated them all into surface boxes with a punch down tool

I used to be much more hands on a decade ago 🫣
 
TBF he just did bare wire cable drops
I did all the terminations myself
Crimping ends at router and all the ones in loft

In the bedrooms I terminated them all into surface boxes with a punch down tool

I used to be much more hands on a decade ago 🫣
Terminating solid wire cable can be a chore. At one time I had some two piece male connectors. One part was a plastic insert that you put the wire into (gives you a chance to do a visual check before crimping) then trim the ends. Insert it into the connector and crimp. Almost a 100% chance you will get the wires in the right place.
Now there are Pass Through connectors that gives you the chance to check the placement before crimping. There are also connectors made for solid wire.
Guess you will have to practice some more...
 

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