Telemetering system
First Claim
1. A telemetering system for use with a telephone installation comprising normally open first switch means connected between a telephone set and telephone line, second switch means connected to the line and operable by a ringing signal on the line, said second switch means being operated by a ringing signal to impose a responding signal on the line momentarily and thereafter to close the first switch means and connect the telephone set to the line.
1 Assignment
0 Petitions
Accused Products
Abstract
A telemetering system useful for telephone installations. A normally open switch is placed between the line and telephone set. A ringing signal permits sensing apparatus to deliver a coded message to the line between the first and second rings, and the normally open switch is closed before the second ring. Ordinarily calls are delayed for the period of one ring and calls seeking data collection are disconnected before the normally open switch closes. Alternatively data may be delivered to a station associated with the telephone set.
10 Citations
5 Claims
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1. A telemetering system for use with a telephone installation comprising normally open first switch means connected between a telephone set and telephone line, second switch means connected to the line and operable by a ringing signal on the line, said second switch means being operated by a ringing signal to impose a responding signal on the line momentarily and thereafter to close the first switch means and connect the telephone set to the line.
- 2. A telemetering system for use with a telephone installation comprising normally open first switch means connected between a telephone set and telephone line, normally open second switch means connected between the line and tone generator means, ringing signal sensing means connected to the line and to the second switch means, a ringing signal on the telephone line causing the ringing signal sensing means to close the second switch means when a ringing signal is detected, timer means connected to the ringing signal sensing means and to the first switch means for closing of the first switch means a controlled time after a ringing signal is sensed.
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5. A telemetering system for use with a telephone installation including a telephone set and telephone line, said telemetering system comprising ringing signal sensing means connected to the telephone line, first normally open switch means connected between the telephone set and the connection of the ringing signal sensing means to the telephone line, first relay means connected to the first switch means, said first relay means being operated through a network by a ringing signal on the telephone line, a first one shot logic means connected to the line and energized by a ringing signal, timer means connected to and energized by the one shot logic means, said timer means being connected to the first relay means and energizing the relay means after a time delay, tone generator means connected to the telephone line through normally open second switch means, second relay means operating said second switch means, said second relay means being energized without delay through a second one shot logic means connected to the timer means whereby said second switch means is closed and connects the tone generator to the line in advance of closing of the first switch means, normally open off hook switch means connected to the first relay means whereby lifting the handset off the hook establishes a circuit through the first relay means as long as the handset is off the hook.
Specification