JP2536396B2 - Subscriber test equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a subscriber test apparatus, and more particularly to detecting whether or not a subscriber line is in use at the start of a subscriber test in operation.

[0002]

2. Description of the Related Art In a conventional subscriber system, a subscriber line is directly wired from an exchange to a subscriber. However, as the number of subscribers has increased, digital exchange has been performed between the exchange and the subscribers using a PCM terminal device or the like, and the subscribers have started to convert the signals into analog signals.

In such a subscriber system, in order to perform a subscriber test, which is a function of a conventional exchange, a subscriber test device has been installed on the subscriber side.

However, in the conventional subscriber test apparatus, the test is started by using the line use information from the upper exchange, the PCM terminal equipment, etc. without confirming the use / unuse (busy / idle) of the subscriber. Was there.

[0005]

In this conventional subscriber test apparatus, in order to obtain the line usage information from the external device, the line changes from the unused state to the used state while the information is obtained. , There was a problem that the communication of the subscriber was interrupted.

An object of the present invention is to provide a subscriber test apparatus which eliminates such a problem.

[0007]

The subscriber test apparatus of the present invention monitors the voltage between subscriber lines and compares it with a reference voltage value.
To detect the busy / idle of the subscriber.
G / idle detection circuit and the subscriber line before operation
The busy / decided state, which is determined by making a ready state and an unused state
Most suitable for busy / idle detection of idle detection circuit
A reference voltage data holding circuit for holding the reference voltage value,
The reference voltage is controlled under the control of the reference voltage data holding circuit.
A reference voltage source that gives a value and a subscriber who tests the subscriber circuit.
Test circuit and test line that switches the subscriber line to the test circuit side
From the busy / idle detection circuit.
Upon receipt of the information, said subscriber test circuit and test relay
And a subscriber test control circuit for informing the start of the test .

[0008]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of a subscriber test apparatus using a busy / idle detection circuit according to an embodiment of the present invention. This subscriber test apparatus includes a busy / idle detection circuit 4, a reference voltage source 5 that can be digitally controlled, a reference voltage data holding circuit 7 that holds the reference voltage value, and a subscriber test control circuit that controls the subscriber test. 6 and a subscriber test circuit 3 for testing the subscriber circuit
And a test relay 8 for switching the subscriber line to the test circuit side.

In the figure, 1 is a subscriber line input terminal and 2 is a subscriber terminal device input / output terminal.

The subscriber signal input from the subscriber line input terminal 1 (a, b) is sent to the subscriber terminal equipment via the subscriber terminal equipment input / output terminal 2.

The busy / idle detection circuit 4 monitors the voltage between the subscriber input terminals a and b, and when the voltage drops below a certain voltage, the subscriber side raises the handset of the telephone and determines that it is busy. When the voltage is high, it is determined that the vehicle is idle, and the busy / idle information is sent to the subscriber test control circuit 6. Upon receiving the idle information, the subscriber test control circuit 6 notifies the test relay 8 and the subscriber test circuit 3 of the start of the test and starts the subscriber test.

Here, the reference voltage source 5 provides a determination voltage most suitable for the busy / idle detection voltage of the busy / idle detection circuit 4, and it is set on the subscriber side before the subscriber test apparatus is put into operation. By making a busy state in which the handset is lifted and an idle state in which the handset is placed, a determination voltage that optimally matches the busy / idle detection voltage of the busy / idle detection circuit 4 is determined. The reference voltage data holding circuit 7 holds the judgment voltage.

Generally, the voltage between the lines a and b of the subscriber line depends on the line resistance between the subscriber terminal device and the telephone set on the subscriber side when the subscriber current supply capability of the subscriber terminal device is constant. , Will change for each subscriber. In the present invention, the busy / idle voltage of the subscriber line is optimally adjusted before the subscriber test device is operated, and the busy / idle voltage of the subscriber is confirmed using this busy / idle voltage before the subscriber test.

[0015]

As described above, according to the present invention, the busy / idle state is experimentally created in the subscriber line before the subscriber test apparatus is operated, and the busy / idle voltage of the subscriber line is optimized. After checking the busy / idle of the subscriber line using the optimum busy / idle voltage,
Conduct a subscriber test. This avoids the problem that the subscriber interrupts the communication of the subscriber while using the subscriber line.

[Brief description of drawings]

FIG. 1 is a block diagram of a subscriber test device using a busy / idle detection circuit.

[Explanation of symbols]

 1 subscriber line input terminal 2 subscriber terminal device input / output terminal 3 subscriber test circuit 4 busy / idle detection circuit 5 reference voltage source 6 subscriber test control circuit 7 reference voltage data holding circuit 8 test relay

Claims (1)

(57) [Claims] 1. A busy / idle detection circuit for detecting a busy / idle of a subscriber by monitoring a voltage between subscriber lines and comparing the voltage with a reference voltage value, and a usage state of the subscriber line before operation, Busy / idle detection circuit busy / determined by creating an unused state
A reference voltage data holding circuit for holding a reference voltage value most suitable for idle detection, a reference voltage source for giving a reference voltage value under the control of the reference voltage data holding circuit, and a subscriber testing a subscriber circuit. A test circuit, a test relay for switching the subscriber line to the test circuit side, and a subscriber test control circuit for transmitting a test start to the subscriber test circuit and the test relay when the idle information is received from the busy / idle detection circuit, Subscriber test equipment characterized by having.