JPS62256540A - Loop back test circuit - Google Patents

Abstract

PURPOSE:To automatically turn back a test signal without operating especially a switch or the like for the loop back test by automatically connecting a false mobile machine to the loop state for only a certain time by the control of an alert signal detecting circuit. CONSTITUTION:When a false mobile machine 1 is called by a monitor station, the machine 1 generates an alert signal in accordance with this call. This alert signal is detected by an alert signal detecting circuit 8, and a timer relay 9 is operated for only a certain time by the detection signal. Though contacts B and C of the timer relay 9 are normally in the short-circuit state, contacts A and C are set to the short-circuit state when a relay coil 9a is excited. Thus, the test signal from the monitor station which is received by a receiving part of the false mobile machine 1 is returned to a connection Circuit 2 from the connection circuit 2 again by contacts C and A of a changeover switch 9b and is turned back to the monitor station from a transmitting part of the false mobile machine 1.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a booster station that amplifies a signal received from a base station and sends it to a mobile device, and amplifies a signal received from the mobile device and sends it to the base station. This paper relates to a loopback test circuit using a pseudo mobile device.

[Conventional technology]

FIG. 2 is a block diagram showing a loopback test circuit in a conventional booster station disclosed in, for example, Japanese Patent Application No. 60-238838.
3 is a connection circuit, 3 is a changeover such as a switch, 4 to 6 are contacts of the changeover 3, and 7 is a handset connected to the pseudo mobile device via the connection circuit 2 by the changeover 3.

Next, the operation will be explained. First, the switch 3 is operated in preparation for a loopback test, and its contact 4 is brought into contact with the contact 5. A test signal for the loopback test from the monitoring station is received by the mobile pseudo-mobile device 1, and sent from the receiving section of the mobile device 1 to the switching device 3 through the connection circuit 2. As described above, in the switch 3, since the contact 4 is in contact with the contact 5 in advance, the test signal is returned to the connection circuit 2, and is sent back from the transmitting section of the pseudo mobile device 1 to the monitoring station. This performs a loopback test of the booster station.

When this loopback test is completed, by switching the contact 4 of the switch 3 from the contact 5 to the contact 6, the pseudo mobile device 1 is connected to the handset 7 and a communication call can be made.

[Problem that the invention seeks to solve]

Since the conventional loopback test circuit is configured as described above, it is necessary to switch the switch to the Niha loopback test side when performing the loopback test, and to the communication side after the loopback test is completed. However, if the switching operation was forgotten, loopback tests could not be carried out, and contact calls would be disrupted, among other problems.

This invention was made in order to solve the above-mentioned problems, and includes a loopback test circuit that can automatically return test signals without having to operate a switch or the like during a loopback test. The purpose is to obtain.

[Means for solving problems]

The loopback test circuit according to the present invention includes an alert signal detection circuit that detects an alert signal generated by a pseudo mobile device when a call arrives at the pseudo mobile device, and a control of the alert signal detection circuit that automatically controls the pseudo mobile device to a certain level. A connection switching means is provided for connecting in a loop state for a certain amount of time.

[For production]

In the loopback test circuit according to the present invention, when the pseudo mobile device generates an alert signal in response to an incoming call from the monitoring station, the alert signal detection circuit that detects the alert signal controls the connection switching means and is connected to the handset. The pseudo mobile device is switched to a loop state, whereby the test signal from the monitoring station received by the pseudo mobile device is sent back to the pseudo mobile device and then back to the monitoring station, achieving automatic return of the test signal. .

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, 1 is a pseudo mobile device that generates an alert signal when receiving a call from a monitoring station, 2 and 7 are the same connection circuit and handset as the conventional one shown in FIG. 2, and 8 is connected to the pseudo mobile device 1. 9 is a connection switching means controlled by the alert signal detection circuit 8, and in this embodiment, a timer relay is used. This timer marine-9 has a relay coil 9a, this relay coil 9a,! : No need for the changeover switch 9b that wanders. A, B and C indicate contacts of the changeover switch 9b.

Next, the operation will be explained. Normally, the timer marine 9 is in the state shown, with the contacts 10 in contact with the contacts 12. Therefore, the pseudo mobile device 1 is connected to the handset 7 via the connection circuit 2, and is in a state where communication calls are possible. When receiving a call from the monitoring station, the pseudo mobile device 1 generates an alert signal in response to the incoming call. This alert signal is detected by the alert signal detection circuit 8,
The detection signal causes the timer relay 9 to operate for a certain period of time. In the timer relay 9, in a normal state, contacts B and C are in a short-circuited state, and when the relay coil 9a is excited, contacts A and C are in a short-circuited state. Therefore, the test signal from the monitoring station received by the receiving section of the pseudo mobile device 1 is returned to the connecting circuit 2 again by the contacts C and A of the changeover switch 9b from the connecting circuit 2, and is sent back to the transmitting section of the pseudo mobile device 1. It will be sent back to the monitoring station. In this way, the pseudo mobile station 1 is automatically connected to a loop state and a loopback test of the booster station is performed.

When the certain period of time has elapsed, the timer relay 9 is restored,
Since the relay coil 9a is automatically switched to open and its contacts C-B are shorted, the pseudo mobile device 1
is connected to the handset 7, and the state returns to a state in which contact calls can be made.

7 [Effects of the Invention] As described above, according to the present invention, the connection switching means is controlled by the alert signal detection circuit, and when the pseudo mobile device receives a call from the monitoring station, the pseudo mobile device performs pseudo movement for a certain period of time. Since the device is automatically connected to a loop state and the test signal is automatically looped back, there is no need to operate a switch at the booster station during loopback tests and contact calls. This has the effect of providing a back test circuit.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a loopback test circuit according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional loopback test circuit. 1 is a pseudo mobile device, 2 is a connection diagram, 7 is a handset, 8
9 is an alert signal detection circuit, and 9 is a connection switching means (timer relay). In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Patent Applicant: Mitsubishi Electric Corporation vs. vL Peek 4 Station 9:9 Immediate Relay

Claims (1)

[Claims] A pseudo mobile device that generates an alert signal when receiving a call from a monitoring station, an alert signal detection circuit that detects the alert signal of this pseudo mobile device, and a connecting circuit that normally connects the pseudo mobile device to a handset. and a connection switching means for connecting the pseudo mobile device in a loop state for a predetermined period of time under the control of an alert signal detection circuit that detects the alert signal when the alert signal is generated.