Archive for October 2012

What is best way to use cat5e cable as phone cable for ADSL

This is my question i asked in http://forums.whirlpool.net.au/forum/125?g=123 , but it is deleted, “because it is against Australian law”. here i have modified header, it was “What is best way to use cat5e cable as ADSL” (trimmed, ADSL cable).

hello. i asked about using cat5e cable as adsl cable. is it worth to join some wires? to reduce attenuation by having more conductive gauge ? 4 pairs are twisted together with 10 cms lay length in my cable. i think: variant 1: join wires of each pair then join 2 and 2 joined pairs. variant 2 : join 1 wire from every pair together, and join second 1 wire from every pair together. i am reading http://forums.whirlpool.net.au/archive/932526

http://forums.whirlpool.net.au/forum/125?g=123
http://forums.whirlpool.net.au/forum-replies.cfm?t=1990521&#bottom

What is best way to use cat5e cable as ADSL cable?

Hello. Is it worth to join some wires to reduce attenuation? 4 pairs are twisted together with 10 cms lay length in my cable. I think: option 1: join wires of each pair then join 2 joined pairs together and other 2 joined pairs together. option 2 : join 1 wire of every pair together, and join second 1 wire of every [twisted] pair together.

I have seen a suggestion in this board not to use multiple pairs: http://forums.whirlpool.net.au/archive/1439572#r24208472 ( url suggested by board script is http://whrl.pl/RcievC ) : “Use only 1 pair (as using multiple pairs just results in more noise/interference).”

Lay length of pairs in my cable: in 16 cms of twisted pairs: 16 periods of blue (and/with blue & white wire), 14 of green, 11 of orange, 10 of brown. They are set in this order: blue – orange – green – brown [- blue]. Pairs are twisted “to left” that means if you look at wires going away, they go to left, that is also named “S”, and 4 pairs are twisted together also as “S”. (I have read about “S” and “left” names just today).

My aim is just to install/get/set shielded/foiled cable instead of simple phone cable. Current cable has untwisted 2 wires, diameter of each is near 1 mm, new cat5e cable has 8 wires, diameter of each is near 0.25 mm.

I have read today that shield of cable should be grounded at both ends. My cable length is 36 meters. There is ready grounding / earth connection at one end. Maybe I will try to make simple, not very powerful grounding for other end, with one 1cm square x 2 meters steal stick, I have soldered to it 2 mm diameter multicore copper wire, near 20 cms.

And why i want shielded cable? 1. For it do not radiate onto people in home. I am not sure it is worth. Because AM radio receiver catches ADSL radiation from 10-20 cms at 700 kHz. But it radiates from 26 kHz to 1100 kHz. 2. To guard ADSL line from noises.
An as I know such weak electromagnetic radiation is generally considered or hoped safe for health, though not strictly proved, and harm of higher frequencies is proved at some strength or distance to wire/antenna (experiment with mouses in box wrapped with cell phones).