Abstract This common control telephone network provides an inherent system for checking the most recently operated switching path of sections of the control network for malfunction. A first potential, the idle marking potential is applied to all output terminals of a first stage of the control network. A second potential is applied from the network input to seize the path such that on completion of a switching-through operation, a second marking potential appears at the output terminal of the switched path. A detecting circuit employing transistors senses the potential at the output terminal and thereby can determine when the switching path or any portion of it has malfunctioned, or is improperly held when it should have released.
Inventors
👤 Wolfgang Arndt
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-31 22:59
CPC Classifications
H; H04; H04Q; H04Q3/00; H04Q3/0008; H04Q3/0012
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
135 words
In a multiple stage switching network, a switching control system including a plurality of output terminals each corresponding to one control switching path, a marking potential source connected in multiple to said terminals, a second potential source, at least one switching control means in each of said switching paths, contacts of each of said switching control means interposed in said switching paths, means for applying an operating potential to one of said switching paths to seize said path for subsequent operation of the switching means within the seized switching path, and for transmitting said operating potential to the output terminal of said switching path, potential sensing means connected to said output terminals to sense the potential at the output terminal of the switched path corresponding to the condition of the switching means in said path.
Claim 2
Dependent Claim
135 words
In a multiple stage switching network, a switching control system including a plurality of output terminals each corresponding to one control switching path, a marking potential source connected in multiple to said terminals, a second potential source, at least one switching control means in each of said switching paths, contacts of each of said switching control means interposed in said switching paths, means for applying an operating potential to one of said switching paths to seize said path for subsequent operation of the switching means within the seized switching path, and for transmitting said operating potential to the output terminal of said switching path, potential sensing means connected to said output terminals to sense the potential at the output terminal of the switched path corresponding to the condition of the switching means in said path.
Claim 3
Dependent Claim
42 words
A telephone network as claimed in claim 1, wherein said potential sensing means comprises a multiple input AND circuit, with a first of the inputs to said AND circuit derived from output terminals and another of said inputs being a test input.