 Sealed end cap mounting for laminated insulator core |
| The present invention provides an insulator comprising a pair of fixing caps and an elongate core ... |
|
| Image processing apparatus |
| What is claimed is: 1. An image processing apparatus comprising: A/D converter means for converting ... |
|
| Photographing apparatus balancing brightness for microscopes |
| It is, therefore, an object of the present invention to provide a photographing apparatus for ... |
|
| Automatic focus control for a microscope |
| The object of the present invention is a process and an apparatus which obviates this disadvantage. ... |
|
| Method and apparatus for automatic optical recognition of road signs |
| Consequently, an object of this invention is to overcome such problems by providing an automatic ... |
|
| Compact electronic device |
| It is, therefore, an object of the present invention to provide a compact electronic device having ... |
|
| Apparatus for adjusting operating conditions of a cathode ray tube |
| An object of the present invention is to enhance operating condition adjustments of a cathode ray ... |
|
| Method and apparatus for digital television error correction without overhead bits |
| Briefly, this and other objects are accomplished by a spectral error correcting system the ... |
|
| Generating half-tone representations |
| OF AN EMBODIMENT The apparatus shown in FIG. 1 may form part of an otherwise conventional half-... |
|
| Ink jet color graphics printing |
| OF A PREFERRED EMBODIMENT Print Data Flow And Structures Referring to FIG. 4, input data to be ... |
|
|
Fault isolation device
| Details |
Inventors: De Vries, Paul; Gewitz, Steven; Heyman, Roald G.;
Assignee:
Primary Examiner: Robinson; Thomas A.
Assistant Examiner:
Attorney, Agent or Firm: Curtis, Morris & Safford
A telephone fault isolation device is installed between customer telephone equipment, such as a PBX or KSU, and telephone company trunk lines feeding into such equipment, and is used to determine whether possible trouble is in the telephone company trunk lines or in the customer equipment. The device includes a monitoring device, such as a telephone handset, and an array of switches each associated with a telephone trunk line. Each of the switches, in a normal condition, connects the trunk line to the equipment, and, in a test condition, connects the trunk line to the monitoring device. A telephone customer can switch over each of the switches in turn and determine whether he can obtain dial tone on that respective trunk line. |
|
DETAILED DESCRIPTION It is an object of this invention to provide a novel fault isolation device capable of isolating telephone system problems.
It is another object of this invention to provide a fault isolation device which is simple in design and construction while being reliable in operation.
It is yet another object of this invention to provide a fault isolation device that permits a customer to quickly determine whether a telephone system problem lies with his equipment or with the telephone company.
According to an aspect of this invention, a telephone line fault isolation device, which is to be installed in line between one or more telephone trunk lines and customer-owned telephone equipment, such as a PBX or a KSU, normally coupled to the one or more trunk lines, comprises a monitoring device, such as a telephone handset, for selectively monitoring the trunk lines; and a line switch array associated with the monitoring device and with the one or more telephone trunk lines for selectively coupling the monitoring device with each of the telephone trunk lines, and for each such telephone trunk line having a normal condition in which the respective telephone trunk line is coupled to the customer-owned telephone equipment and a test condition in which the respective telephone trunk line is disconnected from the customer-owned telephone equipment and is connected instead to the monitoring device.
Preferably, the line switch array includes double-pole double-throw switches, each associated with a respective telephone trunk line and being of the momentary, non-locking type that is spring biased into its normal condition and must be manually held in its test condition.
Preferably, for the purpose of providing a ground signal to the telephone central office to induce a dial tone, the fault isolation device also includes a ground start switch having one contact coupled to ground and another contact coupled to the switch array, so that, in the test position, the other contact of the ground start switch is coupled to the tip side of a respective one of the telephone trunk lines
|
|
Image Analysis 
