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Author Topic: Twisted pair  (Read 3601 times)


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  • Over the Rainbow Bridge
    • The ELRepo Project
Re: Twisted pair
« Reply #15 on: October 19, 2016, 11:15:20 PM »

I have an old but full and detailed pdf spec from B3 cable solutions for external 2 pair drop wire compliant with BT spec CW1411.

Snap!  :D

I see that the electrical characteristics of CW1411 cable are stated to be --
  • Maximum Conductor Resistance: 95 Ohms per km
  • Maximum Mutual Capacitance: 56 nF per km
  • Maximum Capacitance Unbalance: 275 pF per 500 m
  • Minimum Insulation Resistance: 10,000 Mega Ohms per km
I suppose there is some logical reason why the maximum capacitive unbalance is stated as 275 pF per 500 metres rather than 550 pF per km . . .  :-\
:cat:  100% Linux and, previously, Unix. Co-founder of the ELRepo Project.

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