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Whether or not this would work
is a subject of some debate.
I decided to find out myself:
Would Ethernet cable work well for climbing? 1)
by suspending myself with cat-5e Ethernet cable.
Click on any picture to see the full-size version.
I tied the cable to a car lift with two half-hitches
and tried to hold on to the dangling cable.
The knot slipped because Ethernet cable is smooth
and it is too stiff to tie tightly.
It was also hard to hold on to.
Now each half of the cable
only held half of my weight.
To stop the cable from breaking at the knots,
I made each end of my cable into rope.
You will need
To be able to make a clove hitch,
the short fibers should reach three times
around what you are tying the rope to.
Twisting in opposite directions
makes the twists oppose each other,
so that the rope does not untwist.
I tried braiding one end of the rope.
It nearly broke at the unbradided end.
I then braided the other end into rope,
but did not take pictures after that. 3)
When I braided both ends into rope,
the cable did not break at the knots.
The one long fiber of Ethernet cable
was able to hold my weight,
even when I bounced a little.
Ethernet cable can hold the weight of a person
if held very gently at the ends.
However, Ethernet cable breaks very easily
when wrapped or tied. 4)
I think this is a disqualifying weakness:
No, Ethernet cable would not work well for climbing,
although it does have the strength to hold a person.