Telephone

A demonstration of how a telephone "local loop" works

Category:

Science & Technology

Tags:

• telephone
• acme
• school
• david
• stringer

[Orcinus24x5]

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.

[acmeschool]

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.

[MrSelman]

I love the way this guy explains things, great stuff!

Thanks for sharing :)

[Skaliwag66]

these vids are awesome

thanks!!1