I cant really agree or completely disagree. There is a reason people dont understand it. Whats weird about this, is you dont actually have to include physical copper wire outside the building. If you buy a landline in my city, theyll just pull out the wall socket and rewire it to go through a converter box. Theyve probably been doing that now for like 10 years. It usually has a battery backup for power outages and other stuff. Its not hard to duplicate all the stuff a landline has using the same RJ-11 connector, without it being a landline. The connector doesnt actually matter from an electrical engineering point of view. The designer can send whatever they want over the cable within its physical limitations. Its just wire, sometimes shielding, and some special plastic, etc. When youre trapped in the consumer mindset, you learn all these buzzwords about cables, but you dont realize that all cables are essentially just a different layout for various uses. Anything beyond 200Mhz requires signal integrity design rules to avoid crosstalk, and support high speed fractional-N PLLs. The hilarious thing is a lot of high speed communications cables actually follow the same TX/RX rules as a transmission line, or even something youre used to seeing with RF communications systems. This isnt at all NEW in any way. Its just you have to learn how it works, so youre not fooled by anything. When I first got into EE stuff, I had to play A LOT of catchup. Usually you start in the early 1900s of electronics history and then you keep progressing until youve learned everything. Its actually really difficult to comb through all that history, but its necessary. Even grabbing an old phone cable off of a nearby desk in my place, I see two gold-plated contacts and two copper wires. The physical speed limit for a differential pair of wires is like 28G for a single pair: arstechnica/business/2014/07/verizons-deteriorated-phone-lines-cited-in-demand-for-investigation/
Posted on: Tue, 08 Jul 2014 02:45:10 +0000
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