3 ms·
Wow, in a museum, makes me feel old, I was trained in how to adjust them in my first career, end of the 70's. Saw the last 'step by step' exchange decommissione
by chadcmulligan 5y ago
Wow, in a museum, makes me feel old, I was trained in how to adjust them in my first career, end of the 70's. Saw the last 'step by step' exchange decommissioned a few years later, I was working in the 'cross bar' exchange next door. The first 'electronic exchange' was built across town - it used solid state switching.
- jacquesm 5y agoCross bar is a super clever concept.
- chadcmulligan 5y agoIt is, I used to love the noise of it, the chunk, chunk as a call was connected. The switches were so big and noisy compared to now, just realised its one of those things thats disappeared into the past.
- jacquesm 5y agoInitially they went the way of the reed relay, then the 4066 happened and after that VLSI. I remember the difference walking around in the large (building size) exchanges in the 80's and 90's where a whole floor of gear would be replaced by something the size of a couple of refrigerators.