JPH01273473A - Test equipment discriminating communication state of local toll telephone line - Google Patents

Abstract

PURPOSE:To improve the workability and reliability by discriminating the operating state of a line without giving effect on a communication line. CONSTITUTION:A circuit comprising a high impedance circuit retrieves the state of communication such as communicating state of local toll telephone line, dialing state, receiving a call signal, in facsimile communication, data communication state or idle state in a telephone station or the like, a minute current is amplified by a transistor(TR) TR 1 with high sensitivity, the result is sent by an FM transmitter with a minimum output comprising the TR 3, voice is listened to by an FM receiver to discriminate the line state. Thus, a defect such as deformed dial pulse resulting in misconnection, signal trip during call to a customer resulting in mis-registration to a sender customer or click noise with remarkably high sound to both customers during the speech of a customer thereby causing unpleasant sense is avoided and such a defect as deformed print of data communication or facsimile communication is prevented.

Description

[Detailed Description of the Invention] This invention provides a method for connecting subscriber telephone lines, long-distance telephone lines,
A conventional telephone lamp (BC48V) is a tester that can determine the line usage status of a wide range of lines, such as local and international leased lines, data lines, and alarm lines, without affecting the communication line in any way.
) Alternatively, there are testers with built-in light emitting diodes, test handsets, etc., but they all have the following serious drawbacks due to their low impedance. When testing, the dial pulse may collapse and touch ■.

(b) If you test using a conventional tester while a call is being received to a customer, there is a risk that the signal will trip and the number will be incorrectly registered to the calling customer.

(c) When a customer tests using a conventional tester while on the phone, a very high-pitched click noise is heard by the customers on both sides, which is very unpleasant.

(d) Traditional telephone lines were only for voice calls, but in the age of high technology, today's subscriber telephones have changed from simple calls to F.
Since it is used for multiple purposes such as AX communication and data communication, testing with a conventional tester will result in low impedance (those that operate on station power have a negative effect on the line)
There are many problems with this method, namely, the biggest drawback is that data communication printing and fax communication are broken, but we have solved these drawbacks, are compact, have low battery consumption, emphasize workability, and have high reliability. This is a small, lightweight, pocket-type tester that determines the line status with extremely improved reliability.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a tester for determining the condition of a telephone line according to the present invention. 1...Main body 2...Test plug 3...Dial tone test small switch 4...Line status determination switch 5...Antenna wire and for hanging around the neck during work 6 ...FM transmitter 7...AAA battery
8...Audio amplification section 9...Relay Fig. 2 is a layout of parts inside the main body, and Fig. 3 is a circuit diagram.

Claims (1)

[Claims] In a telephone office, etc., the communication status is detected using a high-impedance circuit during communication on a local/long-distance telephone line, during outgoing dialing, during an incoming call signal, during fax communication, during data transmission/reception, or in an empty state. This is a tester that amplifies it with a highly sensitive transistor, transmits it with an FM transmitter with minimal output, and listens to the audio with an FM receiver that is used in conjunction with it to determine the line status.