Data transmission speed, variables questioned

[ubuntuaddicted]

Recently in another thread I mentioned that my whole house is wired up with cat6 cabling where the installer merely ensured that the wire color ordering was the same at each end of the cable and NOT according to some industrial std. An unRAID member stated that it may work but there is possible interference which (IMO) could lead to decreased transfer speeds, packet loss, etc etc. Note also, there is NO jacks, it's merely the cable coming thru hole int he floor and straight into a switch/computer or device its connected to. THANKS

 

My question, what is the tranfer speed/time i should see for transferring a 370mb avi file? This is over 100mbit NICs which are in full duplex and using NFS as the protocol, no special NFS options in the server export or client mounts. Should speeds/time it take be comparable to SMB (again no tweaked settings) protocol?

 

Those are the 2 main ways I share media in my home over those "weirdly terminated" cables. Any estimates or rough estimates will basically either force me to realize that something is WRONG or that all is well with my cat6 connectors which are "specially" terminated according to what you're informing me of. Dont mean to hijack the thread but obviously this raises concerns for me.

[ibixat]

For a 100 mbit connection the max speed you should be able to see is 12.5 megabytes per second roughly, so a 370 mb file could transfer over that line in around 30 seconds (best possible speeds) so you can start with that as your baseline.  If you are getting 45 seconds you know you're using about 66% of the maximum possible speed and at 1 minute 1/2 max speed etc.

 

 

[ubuntuaddicted]

For a 100 mbit connection the max speed you should be able to see is 12.5 megabytes per second roughly, so a 370 mb file could transfer over that line in around 30 seconds (best possible speeds) so you can start with that as your baseline.  If you are getting 45 seconds you know you're using about 66% of the maximum possible speed and at 1 minute 1/2 max speed etc.

 

 

wget or wput should show progress of getting or saving a file onto the other computers over these "weirdly terminated" cat6 cables right?

[Joe L.]

Recently in another thread I mentioned that my whole house is wired up with cat6 cabling where the installer merely ensured that the wire color ordering was the same at each end of the cable and NOT according to some industrial std. An unRAID member stated that it may work but there is possible interference which (IMO) could lead to decreased transfer speeds, packet loss, etc etc. Note also, there is NO jacks, it's merely the cable coming thru hole int he floor and straight into a switch/computer or device its connected to. THANKS

Good that you started your own thread.

 

The specific colors of the wires used does not matter, that is the ONLY difference between the T568A and T568B standards.

 

What GREATLY matters is that specific pins are wired to pairs of twisted wires in the cat5/6 cable.

 

pins 1 and 2 represent one twisted pair of wires, pins 3 and 6 represent another, pins 4 and 5 a third twisted pair, and pins 7 and 8 the fourth pair.

 

It is because the signals on the pins are used as follows:

Transmit data

pin 1  Tx_D1 +

pin 2  Tx_D1 -

Receive Data

pin 3  Rx_D2 + 

pin 6  Rx_D2 -

Bi-directional data 1

pin 4  Bi_D3 +

pin 5  Bi_D3 - 

Bi-directional data 2

pin 7  Bi_D4 + 

pin 8  Bi_D4 - 

 

If you simply put wires randomly on the plugs (but same on both ends), they would have electrical connectivity, but would suffer all kinds of noise and crosstalk problems.  Performance will suffer.

[ubuntuaddicted]

Do these sound right OR should I re-terminate the wires correctly? IF I do a transfer over the SMB protocol I get about 8.5MB/sec

 

 

and if I transfer over NFS I get around 20MB/sec

 

[adammerkley]

I was a cable monkey for a summer about 10 years ago.  My entire job consisted of terminating cat-5 onto patch panels and location drops.  I have "orange-white, orange, green-white, blue, blue-white, green, brown-white, brown" forever burned into my memory thanks to that job. 

[ubuntuaddicted]

LOL, funny how things like that get burned into our databanks but remembering to bring home milk cause the wife asked is easily forgotten.

 

Anyway, can anyone speak on my transfer rates or speeds and for sure claim that my terminated cables are infact causing interference and slow downs in my SMB and NFS transfers? I would appreciate it.

[SSD]

Even if you can get reasonable throughput at 100mb, when you try to push gigabit speeds, you will have problems. Why not get it straightened out now?

[ubuntuaddicted]

Even if you can get reasonable throughput at 100mb, when you try to push gigabit speeds, you will have problems. Why not get it straightened out now?

bottom line I suppose u r right despite everything working like a dream in my 7 computer internal network I might as well re-terminate all the wires now before my unRAID server goes into the production environment

 

 

Tapatalk is tha shizzle

[cyrnel]

I'd just add that even if goofy wiring choices don't affect you much now they will later, when other sources of interference arrive. Things like using a previously unused power outlet, installing any high-current device nearby, etc. The standards aren't arbitrary, they're designed to minimize problems. Pick A or B and stick with it. (And it isn't just termination. The handling of the wire and its routing relative to other fixtures and power can make as much difference, but those are things to think about before the install.) And put some jacks on those things!

[ubuntuaddicted]

I'd just add that even if goofy wiring choices don't affect you much now they will later, when other sources of interference arrive. Things like using a previously unused power outlet, installing any high-current device nearby, etc. The standards aren't arbitrary, they're designed to minimize problems. Pick A or B and stick with it. (And it isn't just termination. The handling of the wire and its routing relative to other fixtures and power can make as much difference, but those are things to think about before the install.) And put some jacks on those things!

just so happened to run into a guy who has some jacks for me, just not going to be drilling the holes into my walls YET. THanks guys! Slow build and plenty of prep to ensure this first unRAID is the best!