JPH04103236A - Multiplex converter - Google Patents

Abstract

PURPOSE:To easily test the transmission state of each channel by providing a multiplexer means selecting either a transmission channel signal or a pseudo pattern signal, multiplexing the selected signal and sending the result and an error check means extracting a reception selection signal corresponding to the pseudo pattern signal as a text signal and checking an error to the converter. CONSTITUTION:A 1st sender side selection circuit 11b selects a pseudo pattern when a sender side channel changeover switch 11d is thrown to a 1st channel position and outputs the pattern as a 1st transmission selection signal. First-N-th transmission selection signals are multiplexed by a multiplex section 11e and the result is sent as a multiplex signal. The multiplex signal is demultiplexed by a demultiplex section 12a and the result is sent as 1st-N-th reception signals. When a receiver side channel changeover switch 12g is thrown to the 1st channel position, a 1st changeover device 12b gives the 1st reception signal to a pattern detector 12e as a test signal. Thus, it is not required to connect a measuring device or the like to each channel through the use of a cable or the like in the channel test and the channel test is easily and quickly executed.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a digital multiplex conversion device.

(Prior Art) Generally, a digital multiplex converter has a transmitting section and a receiving section. The section separates the multiplexed signal and sends out a plurality of receiving channels.

The above transmitting section and receiving section are connected via a transmission line, and when testing the transmission status on the transmission line for each channel, especially when a line failure occurs, investigate which channel the failure occurred on. When doing so, it is necessary to test the transmission status of each channel using a pattern generator, test measuring instrument, etc. each time an investigation is conducted.

(Problems to be Solved by the Invention) As mentioned above, conventionally, when testing the transmission status of each channel in the event of a line failure in a multiplex converter, the pattern generator, test measuring instrument, etc. are connected to cables each time the test is performed. In other words, it takes time to connect cables and the like. As a result, there is a problem that it takes time to investigate the faulty channel and it takes time to restore the line.

SUMMARY OF THE INVENTION An object of the present invention is to provide a multiplex converter that can easily test the transmission status of each channel.

(Means for Solving the Problems) According to the present invention, there is provided a pattern generating means for generating a pseudo pattern signal, a pattern generation means for generating a pseudo pattern signal, a pattern generating means for receiving transmission channel signals from a plurality of transmitting side channels, and a pattern generating means for generating a pseudo pattern signal, and a pattern generation means for receiving transmission channel signals from a plurality of transmitting side channels, and generating the transmission channel signals corresponding to the transmission channels. and a selection means for selecting one of the pseudo pattern signals and sending it out as a selection signal; a multiplexing unit for multiplexing the selection signal and speed ratioing it as a multiplexed signal; a separation unit that separates the signal into a plurality of reception selection signals; and a switching unit that extracts only the reception selection signal corresponding to the pseudo pattern signal as a test signal and sends the other reception selection signals as reception channel signals to the respective reception side channels. and error detection means for receiving the test signal and detecting an error.

(Example) The present invention will be explained below with reference to Examples.

Referring to FIG. 1, the illustrated multiplex conversion apparatus has a transmitting section 11 and a receiving section 12, and these transmitting section 11 and receiving section 12 are connected by a transmission path 13.

First to Nth (N is an integer of 2 or more) transmitting side channels are connected to the transmitting section 11 (only the first transmitting side channel CH is shown in FIG. 1).

The first transmitter channel CH, is connected to a first transmitter selection circuit (SEL) llb via a first B/U (bipolar/unipolar) converter 11a, so that the first transmitter channel signal 1 to the transmitting side selection circuit 11b. On the other hand, a pattern generator (PG) llc is connected to the first transmission side selection circuit 11b, and a pseudo pattern is provided from the pattern generator 11c to the first transmission side selection circuit.

The first transmission side selection circuit 11b is controlled by the transmission side channel changeover switch lid, selects either the first transmission side channel signal or the pseudo pattern, and outputs the selected signal as a first transmission selection signal.

Note that the second to Nth transmission side channels are similarly connected to the second to Nth transmission side selection circuits (not shown), respectively, and the second to Nth transmission side channels are connected by the control of the transmission side channel changeover switch 11d. The transmission side selection circuit selects one of the second to Nth transmission side channel signals and pseudo patterns, respectively, and outputs the second to Nth transmission selection signals.

These first to Nth transmission selection signals are sent to a multiplexer (MUX).
) 11e and sent to the transmission line 13 as a multiplexed signal.

In the receiving section 12, the multiplexed signal is separated by a demultiplexing section (DMUX) 12a.
The demultiplexer 12a demultiplexes the multiplexed signal and outputs it as first to Nth reception selection signals.

The first reception selection signal is connected to the first switch 12b,
This first switch 12b is connected to a first receiving side selection circuit (SE
L) first unipolar/bipolar (U
/B) Connected to converter 12d.

On the other hand, the switch 12b of 1j41 is a pattern detector (PG
DET) 12e, and the pattern detector 12e is further connected to a display device 12f. and,
The first switching device 12b and the first receiving side selection circuit 12c are each controlled by a receiving side channel changeover switch 12g as will be described later.

Similarly, the second to Nth reception selection signals are the second to Nth reception selection signals.
The second to Nth switching devices are connected to the second to Nth switching devices (not shown), and the second to Nth switching devices are connected to the second to Nth switching devices via second to Nth receiving side selection circuits (not shown), respectively. It is connected to a unipolar/bipolar (U/B) converter (not shown).

Further, the second to Nth switching devices are pattern detectors 12e.
It is connected to the. The second to Nth switching devices and the second to Nth receiving side selection circuits are each controlled by a receiving side channel changeover switch 12g.

Here, a case where normal multiplex transmission is performed will be explained.

During normal multiplex transmission, the transmitting side channel changeover switch lid is switched to the normal (NORMAL) position, and in the same way, the receiving side channel changeover switch 1
Even at 2g, the switch is switched to the normal position.

In the first to Nth transmitting side selection circuits, when the transmitting side channel changeover switch lid is in the normal position, the first to Nth transmitting side channel signals are selected respectively, and the multiplexer
Give to 1e.

As described above, these first to Nth transmission side channel signals are multiplexed into a multiplexed signal by the multiplexer 11e, and sent out to the transmission line 13. Then, this multiplexed signal is separated into first to Nth reception side channel signals by the separation section 12a.

As described above, when the receiving side channel changeover switch 12g is in the normal position, the first to Nth switching devices transfer the first to Nth receiving side channel signals to the first to Nth receiving side selection circuits, respectively. give. The first to Nth receiving side selection circuits send out the first to Nth receiving side channel signals to the first to Nth U/B converters, respectively, and
The receiving side channel signals of the first to Nth U/Bs are respectively
The signal is transmitted from the converter to the first to Nth receiving channels.

On the other hand, when testing the first channel, the transmitting side channel changeover switch lid is switched to the first channel position, and similarly, the receiving side channel changeover switch 12g is switched to the first channel position.

In the first transmission side selection circuit 11b, when the transmission side channel changeover switch lld is in the first channel position, the pseudo pattern is selected and the pseudo pattern is output as the first transmission selection signal. In this case, the second to Nth transmission side selection circuits select the first to Nth transmission side channel signals, respectively, and output them as second to Nth transmission selection signals to the multiplexing section 11e. These first to Nth transmission selection signals are multiplexed by the multiplexer 11e and sent out as a multiplexed signal. This multiplexed signal is separated by the separation section 12a and sent out as first to Nth received signals.

As described above, when the receiving side channel changeover switch 12g is in the first channel position, the first changeover switch 12b is in the first channel position.
The received signal is given to the pattern detector 12e as a test signal.

Since this first received signal is a pseudo pattern, the pattern detector 12e detects an error in the pseudo pattern, that is, counts the number of error bits and displays the count value on the display device 12f.

Furthermore, when the receiving side channel selection switch 12g is in the first channel position, the first receiving side selection circuit 12c selects another input terminal. In this case, the other input terminal has an AIS
The AIS signal is sent to the first receiving channel via the first U/B conversion circuit 12d.

On the other hand, when the receiving side channel selection switch 12g is in the first channel position, the second to Nth switching devices provide the second to Nth reception signals to the second to Nth receiving side selection circuits, respectively. Then, the second to Nth receiving side selection circuits respectively send the second to Nth receiving side channel signals to the second to Nth U/B converters, and the second to Nth receiving side channel signals are transmitted to the second to Nth receiving side channel signals. are transmitted from the second to Nth U/B converters to the second to Nth receiving channels, respectively.

Note that when the first to Nth reception side selection circuits select the first to Nth reception signals, +5 volts is applied to the other input terminals.

In the above example, the case where the first channel is tested has been described, but when testing the second to Nth channels, the test may be performed in the same manner as the test of the first channel.

(Effects of the Invention) As explained above, in the present invention, when testing channels, there is no need to connect measuring instruments to each channel using cables, etc., and as a result, channel tests can be performed easily and quickly. effective.

[Brief explanation of the drawing]

FIG. 1 is a diagram schematically showing an embodiment of a multiplex conversion device according to the present invention. 11... Transmission section, 12... Receiving section, 13... Transmission path.

Claims (1)

[Claims] 1. Pattern generation means for generating a pseudo pattern signal;
receives transmit channel signals from multiple transmitter channels;
a selection unit that selects either the transmission channel signal or the pseudo pattern signal corresponding to the transmission channel and sends it out as a selection signal; a multiplexing unit that multiplexes the selection signal and sends it out as a multiplexed signal; a separation unit that receives the multiplexed signal and separates the multiplexed signal into a plurality of reception selection signals; and a separation unit that extracts only the reception selection signal corresponding to the pseudo pattern signal as a test signal and converts the other reception selection signals into reception channel signals. 1. A multiplex conversion device comprising: switching means for transmitting the test signal to each receiving side channel; and error detection means for receiving the test signal and detecting an error.