The pause between rings isn't for off-hook detection. Other than a gentler way of notifying of a pending call (continuous ringing would suck) some automatic switch installations would share the same ring generator across multiple shelves. 1 ring unit which is constantly generating the ring voltage switched between 3 shelves for 2 sec each. Some switches have continuous-running ring generators and a loop is connected to it 'on the fly' so the first ring may be really short.
I probably got that piece of information from the Texas Instruments book "Understanding Telephone Electronics". Thanks for the clarification. This summer, in a rural area where I work, about 40 percent of us spent a week with telephones that worked, but didn't ring. I'm assuming that the current ring generator is on a card in the big gray box by the road, and that one was defective.
I love the way this guy explains things, great stuff!
Thanks for sharing :)
MrSelman 2 years ago 2
Comment removed
fabkut 2 years ago
The pause between rings isn't for off-hook detection. Other than a gentler way of notifying of a pending call (continuous ringing would suck) some automatic switch installations would share the same ring generator across multiple shelves. 1 ring unit which is constantly generating the ring voltage switched between 3 shelves for 2 sec each. Some switches have continuous-running ring generators and a loop is connected to it 'on the fly' so the first ring may be really short.
Orcinus24x5 3 years ago
Thanks Orcinus,
I probably got that piece of information from the Texas Instruments book "Understanding Telephone Electronics". Thanks for the clarification. This summer, in a rural area where I work, about 40 percent of us spent a week with telephones that worked, but didn't ring. I'm assuming that the current ring generator is on a card in the big gray box by the road, and that one was defective.
acmeschool 3 years ago
these vids are awesome
thanks!!1
Skaliwag66 3 years ago