JPS61121554A - Channel continuity testing system of common line - Google Patents

Abstract

PURPOSE:To economize a channel continuity test by providing an MFC transmitter and an MFC receiver corresponding to transmitter and receiver parts of a transceiver. CONSTITUTION:When an originating station 1 realizes the start of the continuity test it drives the transmitter 3 from an SD and transmits a code 11. Then said station monitors the output of a receiver 4 by an SCAN. If the code 11 is received, the circuit is decided to be excellent. Continuously the station 1 commands the transmitter 3 by the SD and stops the code 11. If the code 11 is recognized by the receiver 4, the continuity test is successful. In terms of a two-line channel, a terminating station 2 monitors the output of a receiver 5 by the SCAN and recognizes the reception, it drives a transmitter 6 to transmit a code 14, which is received by the receiver 4. When the reception is recognized, the transmission of the code 11 is stopped. If the code 11 is recognized by the receiver 5, the transmission of the code 14 is stopped. When the code 14 is recognized by the receiver 4, the continuity test is successful.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a continuity test of an analog communication path in an analog common line, and particularly relates to how to use a signal transmitter/receiver used for continuity testing [Background of the Invention] According to CCITT Recommendation Q724 17. '2000Hz is to be used for the 4-wire analog communication path, 2000Hz in the front direction and 1780Hz in the rear direction for the 2-wire communication path, suggesting that a dedicated transceiver will be installed. . However, the number of transmitter/receiver equipment is about two circuits per station, and there is a problem that it is not economical to provide dedicated hardware and software.

[Purpose of the invention]

The object of the present invention is to use an MFC signal transmitter/receiver as a transmitter/receiver for communication path continuity testing on an analog common line, and to use it not only as a transceiver in a 4-wire communication path, but also as a TRANSPON in a 2-wire communication path.
The objective is to provide a method that can also be used as a DER.

[Summary of the invention]

The required transmission frequency is 2000Hz ± 20Hz%,
The frequency for the FC signal is 1980 Hz, and if this is generated by a digital signal device, the frequency error can be almost ignored, and the receiving standard is 200 Hz±30 Hz, so it can be used effectively without any problems. Further, for example, 1740Hz may be used instead of 1780H2 in the rear direction of the two-wire communication path.

The present invention is characterized in that an MFC transmitter and an MFC receiver are provided corresponding to the transmitter section and the receiver section of the transceiver.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

Figure 1 shows the case where the application is applied to a 4-wire communication path, where 1 is the transmitting station, 2 is the receiving station, 3 is the MFC transmitter placed in the transmitting station, and 4 is the MF
C receiver, and 3 and 4 form a transceiver. The operation sequence in this case is shown in FIG. FIG. 2 shows a case where the system is applied to a two-wire communication path. The symbols 1 to 4 have the same meanings as in FIG. 1, 5 is an MFC receiver, 6 is an MF''C transmitter, and 5 and 6 constitute a transponder.

The operation sequence in this case is shown in FIG.

First, explanation will be given using FIGS. 1 and 3. When the transmitting station 1 learns that the continuity test has started, it drives the transmitter 3 using the SD shown in FIG. 1 and sends "code 11". Code 11 is 1980H
Z and 1! It is a +80Hz mixed wave. Next, the output of the receiver 4 is monitored by SCAM. If code 11 is received, it is known that the line is good. Subsequently, the SD commands the transmitter 3 to stop the code 11, and if this is confirmed by the receiver 4, the continuity test is successful. All other cases are test failures.

Next, explanation will be given with reference to FIGS. 2 and 4. At the transmitting station 1, the transmitter 3 is driven by the SD shown in the figure to send out the code 11 at the start of the continuity test. At the receiving station 2, the output of the receiver 5 is SCA
It is monitored by M, and when reception is confirmed, transmitter 6 is sent from SD.
and sends "Code 14". code 14 is 174
It is a mixed wave of 0Hz and 1980I (Z. Code 14 is received by receiver 4 of transmitting station 1, and when reception is confirmed, transmission of code 11 is stopped. Receiver 5 of receiving station 2 When it is confirmed that the code 11 has stopped, the transmission of the code 14 is stopped, and when this is confirmed by the receiver 4 of the transmitting station 1, the continuity test is successful. In all other cases, the test is a failure.

According to this embodiment, an MFC oscillator as hardware,
There is an advantage that the receiver can be used as a transmitter/receiver (transceiver or even transponder) for continuity testing without leaving the receiver as is.

〔Effect of the invention〕

According to the present invention, an MFC transceiver can be used as a transmitter/receiver for a 4-wire communication path (transceiver of a transmitting station) for an analog/7" common line, and can also be used as a transceiver for a 2-wire communication path (transceiver for a 2-wire communication path). transceiver at the originating station, transponder at the terminating station)
Since it can also be used as a test, there is a good effect without having to install various transceivers dedicated to continuity tests.

[Brief explanation of drawings]

Fig. 1 is a diagram of the relationship between the calling and receiving stations in the case of a 4-wire communication path according to an embodiment of the present invention, Fig. 2 is a configuration diagram in the case of a 2M communication path, and Fig. 3 corresponds to the case of Fig. 1. FIG. 4 is an operation 70-chart corresponding to the case of FIG. 1... Originating station, 2... Receiving station, 3...
MFC transmitter, 4...MFC receiver, 5...M
FC receiver, 6...MFC transmitter.

Claims (1)

[Claims] 1. MF as a test sound transmitter/receiver installed in the exchange for continuity testing of analog communication paths on analog common lines
A transmitter/receiver for C signals is used, and an MFC signal is used as the test sound.In the case of a four-wire communication line, an MFC transmitter is installed in correspondence with the transmitter and receiver sections of the transceiver installed at the transmitting station. and MFC receivers are installed, and in the case of a two-wire communication path, the transceiver placed in the originating station is configured as described above, and the MFC receiver is installed in correspondence with the receiver section and transmitter section of the transponder placed in the destination station. and an MFC transmitter, the MFC transmitter/receiver being able to handle MFC signals containing frequencies different from those of the previous item.