Electrical – How to make a good electrical connection with wire I can’t solder

soldering

A few days ago my DSL connection kept tripping. After abusing the service provider for a few days, I looked at the stats and noticed signal attenuation was sky high and attainable rate was very low(<1000 Kbps). I checked the wires and found that one of the wires going into the ADSL splitter was hanging on by a few strands and was about to break.

The problem

The main source wire has solid cores, and is joined(twisted together) to a thin stranded wire which has a RJ11 jack to the splitter. I wanted to improve upon this by soldering but later found out that the soldering iron's heat burns off the strands in the thin wire. How do I connect it reliably to the solid cored wire?

I'd prefer if I get to connect the two wires together directly rather than by a jack or something similar(since introducing jacks could cause signal loss).

Edit: My source wire(untwisted) looks similar to this:

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The RJ11 cable is something similar to headphone wire – it has 4 non-enameled ultra-thin wires in each colored insulation. It has a red and a green insulation in there(so 4 strands for red, 4 for green). The thin wires also make it a nightmare to strip the insulation off – the wires break too easily.

Here's an actual image of the source cable:
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The top and bottom wires are just copper solid-core wires and the printed part is sheath. An electrician came yesterday and 'fixed' the thing. It stopped the tripping problem but I want something more elegant than this.
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The other end of the red 'fixer' goes to the splitter. I don't think it'd do much good by opening it up – unless I'd just solder the source wire under the ADSL jack on the splitter's PCB.

Best Answer

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Figure 1. An insulation displacement connector (IDC) box.

Wires are pushed down into the terminals using an expensive professional push-down tool with built-in cutter or a cheap plastic pusher. The blades in the IDC connector displace the insulation (by cutting through it) to contact the wires.

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Figure 2 and 3. The "pro" tool and the cheap plastic pusher.