Hello all,

I`m trying to come up with a couple of equations to determine the characteristics of residential networks.
Basically, what I`ve got so far is that the bandwidth is determined by the interval in which PSACR (power sum attenuation to cross talk ratio) has a positive value.
I do realize that bends in the cable will modify the impedance and thus modify the twisted pair characteristics.

So, what I am looking for are the equations (or at least some help in coming up with them) that would give me length and bend (corner) dependencies (for example, if I have a 130m link that has 4 corners, my link will have a bandwidth of X, attenuation of Y and max data rate of Z).

Thanks!

others couldn't have said it better

Your answer would be very product and cable design dependent. What gauge (AWG) is the cable, what insulation does it have etc.

The main manufacturers Commscope, Panduit, Siemon, Leviton etc will have product specific data on their Cat6 and Cat6A products online (NEXT, FEXT, AXT etc).

BTW Cat6 is an industry standard that dictates a maximum distance of 100m for 1GBASET. If you exceed 100m you're not compliant to Cat6 and you're just using a Cat6 cable for your specific purpose.

_________________
"If you're good at anticipating the human mind. It leaves nothing to chance."
-Jigsaw

Hi,
Thanks for the reply.

What I am looking for is to calculate the link characteristics based on the manufacturer specifications AND my specific topology.
I know the (theoretical) limit for Cat6, but I would like to know what specifications my link has if it`s 105m long or 55m long, if it`s a straight line or has 3 corners (bends)...

Thanks again.

The formula I found 2Hxlog2V bits/sec where H is the frequency band and V is the number of discrete levels transmitted

however the formula fails to consider Cable loss or cable attenuation which is largely responsible for limiting the data rate transmitted and the carrier signal frequency, any cable is capable of transmitting huge amount of data, what limits them for practical use are the attenuation incurred along the length of the cable, which increases exponentially over frequency and distance. a major factor for cable, specially for long runs.

You should also consider the type of modulation used to transmit the information and the amount and technique used for recovery and redundancy, for all practical purposes the manufacturer data holds true for the majority of applications for a specific cable.

_________________
"If you're good at anticipating the human mind. It leaves nothing to chance."
-Jigsaw

I would like to find out at least what happens if I go over 100m.
For example if I have a link where I need just a couple more meters and end up with a 110m long channel, if that section of my network will still be within spec.
Thanks again!