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<p>[QUOTE="fatima, post: 1433862, member: 22143"]This is an example of where electronics <i><b>reduces</b></i> metal usage including PM usage. This is a video of a #5 crossbar telephone switch that were commonly used in the USA in the old Ma Bell territories. There were 1000s of them and when you lifted your phone, this is where it was connected. The noise that you hear are phone calls being made. This switch was the pinnacle of electromechanical system design. There are no computers, no operating systems, no digital electronics at all. It was all done by mechanical relays. As a result there was a huge amount of metal used in one of these central offices and there was PMs used all over it because these things were built with specifications of something like 5 minutes downtime in 40 years. </p><p><br /></p><p>(make sure you turn up the volume and watch it for a while to see the size of the place)</p><p>[video=youtube;gkXzljS74Nw]http://www.youtube.com/watch?v=gkXzljS74Nw[/video]</p><p><br /></p><p>Today, these kinds of switches have all been replaced by electronic switching systems and something the size of this office can now be handled by something the size of a refrigerator. It's a huge savings in materials costs and thus also a big reduction in PMs, including silver, being used.[/QUOTE]</p><p><br /></p>
[QUOTE="fatima, post: 1433862, member: 22143"]This is an example of where electronics [I][b]reduces[/b][/I] metal usage including PM usage. This is a video of a #5 crossbar telephone switch that were commonly used in the USA in the old Ma Bell territories. There were 1000s of them and when you lifted your phone, this is where it was connected. The noise that you hear are phone calls being made. This switch was the pinnacle of electromechanical system design. There are no computers, no operating systems, no digital electronics at all. It was all done by mechanical relays. As a result there was a huge amount of metal used in one of these central offices and there was PMs used all over it because these things were built with specifications of something like 5 minutes downtime in 40 years. (make sure you turn up the volume and watch it for a while to see the size of the place) [video=youtube;gkXzljS74Nw]http://www.youtube.com/watch?v=gkXzljS74Nw[/video] Today, these kinds of switches have all been replaced by electronic switching systems and something the size of this office can now be handled by something the size of a refrigerator. It's a huge savings in materials costs and thus also a big reduction in PMs, including silver, being used.[/QUOTE]
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