# Thread: Network cables

1. ## Network cables

The boss approached me this morning asking if I could set up a newtwork cable for him. No problems I said until I went to see the problem to be solved. He wanted me to set up some cabling in two buildings acroos the yard from each other. Problem was Building A had network ports but Building B didn't. As it was business critical I decided that the best way to do this was to stretch a network cable between the two buildings.

I worked out that I had two telegraph poles between the buildings and I could utilise them in my problem. So I had a cable 16 metres long and the the two poles that were 15 metres high and the cable was attached to the top of each pole. After attaching the cables I noted that the lowest point of the cable was 7 metres from the ground.

My question is: How far apart are the poles?

2. ## Re: Network cables

Another non-Euclidean problem?

<span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">The poles are 15 metres high. The lowest point of the cable is 7 metres from the ground, hence 8 metres below the top of the poles (assuming that the ground is flat). Since the cable is only 16 metres long, the two poles must be 0 metres apart.</span hide>

3. ## Re: Network cables

<img src=/S/trophy.gif border=0 alt=trophy width=15 height=15>

easy-peasy <img src=/S/grin.gif border=0 alt=grin width=15 height=15>

4. ## Re: Network cables

<span style="background-color: #FFFF00; color: #FFFF00; font-weight: bold">Could the poles not have been 8 metres apart, with the cable attached at one end to the top of one pole, and attached in the middle of its length to the other pole so that the remaining 8 metres hung down?
Assuming that there was zero droop in the cable, of course!</span hide>

5. ## Re: Network cables

Leif

I shall not accept your response with your arguments as there could also be an infinite number of alternatives as well if it hung down 1 metre the poles could be 15 metres apart etc

The question stated joined at the top of the poles.... but I shall give you a <img src=/S/trophy.gif border=0 alt=trophy width=15 height=15> for innovation <img src=/S/cheers.gif border=0 alt=cheers width=30 height=16>

6. ## Re: Network cables

If the poles were 15 metres apart, the lowest point of the cable wouldn't be 7 metres from the ground, but 15-1 = 14 metres. Leif's solution does satisfy the condition.

7. ## Re: Network cables

Jerry - how did you end up fixing your boss' problem?

8. ## Re: Network cables

My Apologies Leif, I saw Hans's response after the your original and realised I had not read it correctly, sorry, you can have an extra donut with your coffee on me.

9. ## Re: Network cables

Tim

I'm not that stupid! I couldn't work it out myself that is why I got Hans and Leif to work it out for me <img src=/S/evilgrin.gif border=0 alt=evilgrin width=15 height=15>

<img src=/S/whisper.gif border=0 alt=whisper width=29 height=17>Usually works

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