JPH02301331A - No-hit switching device for receiver - Google Patents

Abstract

PURPOSE:To prevent the generation of a code error at switching by making the polarity of a bipolar signal output waveform of a receiver in standby coincident with the polarity of an output waveform of an active receiver and switching the receivers through the use of a switching device using a make- before-break contact. CONSTITUTION:When the polarity of the waveform of the bipolar signal demodulated by an active receiver 1 and outputted from a U/B converter 5a is discordant with the polarity of the waveform of the bipolar signal demodulated by a standby receiver 2 and outputted from a U/B converter 5b, the U/B converter 5b is controlled based on a discordance detection signal. Thus, the polarity of the waveform of the bipolar signal outputted from the U/B converter 5b is inverted to make it coincident. When the receiver is switched from the active 1 into the standby receiver 2, the make-before-break contact 7a of the switching device 7 is changed over the generation of even a 1-bit code error is not implemented at the switching between the receivers to apply switching without momentary interruption.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a non-interruptible switching device for a receiver, and in particular, a modification of a receiving baseband switching device for each receiver having a working side and standby side configuration in a data transmission device. As a reception baseband switching device in each receiver, for example, Fujitsu Technical Report Vol. 1.34
FIG. 1 is a block diagram showing a conventional bipolar signal switching device disclosed in No. 7 (1983). In the conventional configuration shown in FIG. 4, 1 is the active side receiver, 2
is a backup side receiver, 3a and 3b are U/B converters provided in each receiver 1.2 and converts a unipolar signal into a bipolar signal, and 4 is a bipolar signal output from each receiver 1.2. Switching contacts 4a and 4b respectively switch the
This is a switch equipped with a switch. Next, the operation will be explained. The data of the unipolar signals demodulated in the working receiver 1 and the protection receiver 2 are respectively subjected to U/B conversion p.
%3a and 3b, the data of the bipolar signal of the working receiver 1 is selected by the switching device 4 and output to the next stage, and the reception switching is performed by sending a switching command signal to the switching device 4. By manually switching the contact 4a to the contact 4b at A, switching from the active receiver 1 side to the standby receiver 2 side is performed.

[Problem M that the invention attempts to solve]

Since the conventional switching device between working and standby in each of the receivers on the working and standby sides is configured as described above,
When the output waveforms of the bipolar signals from the active receiver 1 and the backup receiver/receiver 2 are in a state of mutually different polarity as shown in FIG. When switching the active receiver 1 to the protection receiver 2, the signals of different polarities cancel each other out at the time of the reception switch, and code errors are prevented for at least several m5ec until the reception switch is completed. There was a problem in that it would occur. This invention was made to solve the above-mentioned problems, and provides a bipolar signal non-interruption switching device that does not generate even a single bit of code error when switching between receivers. The purpose is to. [Means for Solving Problem 73] The instantaneous lossless switching device for a receiver according to the present invention has a configuration including a working side receiver and a standby side receiver. The polarity of the output waveform was made to match the polarity of the bipolar signal output waveform of the other receiver currently in use, and switching between each receiver was performed using a switch with a make-before-break contact. It is something.

[Effect]

In the non-instantaneous switching device for a receiver according to the present invention, the polarity of the bipolar signal output waveform of the receiver in standby is made to match the polarity of the bipolar signal output waveform of the receiver in use in advance, and the polarity is set in this state. Since the switch uses a before-break contact and switches without momentary interruption, even one bit of code error does not occur when switching between the receivers.

【Example】

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a non-interruption switching device for a receiver according to the present invention will be described below with reference to FIGS. 1 to 3. FIG. 1 is a block diagram showing a schematic configuration of a non-interruption switching device for a receiver using an embodiment of the present invention. Also in this embodiment configuration of FIG. 1, 1 is the active side receiver;
2 is a backup receiver. 5a and 5b are provided in each receiver to convert a unipolar signal into a bipolar signal, and to convert the polarity of the signal output waveform from the outside.
/B converter, 6a. 6b compares the bipolar signal output waveforms of each U/B converter 5a and 5b by inputting the switching command signal A, and when the polarities of both signal output waveforms do not match, controls the corresponding converter 5a or 5b. 7 is a bipolar signal polarity comparator that converts the polarity of the signal output waveform after switching to the polarity of the signal output waveform before switching, and 7 is a bipolar signal polarity comparator that converts the polarity of the signal output waveform after switching to the polarity of the signal output waveform before switching. This is a switch having a make-before-break contact 7a that switches at . Next, the operation will be explained. Of the working and standby receivers 1.2, either one of the working receivers, that is, in the case of FIG. When the polarity of the bipolar signal waveform output from the U/B converter 5a does not match the polarity of the bipolar signal waveform demodulated by the backup side receiver 2 and output from the U/B converter 5b, this The bipolar signal polarity comparator 6b of the receiver 2 compares both bipolar signals to detect a mismatch, and controls the U/B converter 5b based on this mismatch detection signal. The polarity of the bipolar signal waveform output from this U/B converter 5b is inverted and matched as shown in FIG. 3, and the same operation is performed even in the opposite case. . Also, receivers currently in use for maintenance and inspection. In the case of Fig. 1, when switching from the working receiver 1 to the backup receiver 2 (or conversely, after completing maintenance and inspection etc., switch from the backup receiver 2 to the working receiver 1). When switching), it is only necessary to switch the make-before-break contact 7a of the switch 7, and at this switching point, the polarities of the bipolar signal output waveforms of each receiver 1.2 are matched, so that In contrast to the conventional case described above, there is no signal loss and therefore each receiver 1.2 can be switched from one to the other without coded errors. In the embodiment shown in FIG. 1, switching of the AMI signal among the bipolar signals was described, but the same effect can be applied to switching the CMI signal as in the other embodiment shown in FIG. You can get the desired action and effect. That is, also in the configuration of the embodiment shown in FIG.
is for each U/C converter 9a by manual switching command signal A.
, 9b, and if the polarities of both signal output waveforms do not match, the corresponding converter 9a or 9b
Each bipolar signal polarity comparator converts the polarity of the signal output waveform after switching into the polarity of the switched signal output waveform by controlling [Effects] As described above, according to the present invention, the polarities of the bipolar signal waveforms output from each converter provided in each receiver on the working side and the standby side are mutually changed by each corresponding bipolar signal polarity comparator. Compare, control the corresponding converter, convert the polarity of the signal output waveform after switching to the polarity of the signal output waveform before switching, and then switch without interruption using a switch with make-before-break contacts. As a result, with an extremely simple circuit configuration, it is possible to switch between the active and standby receivers during maintenance and inspection without code errors, and as a result, the terminal equipment after the receiver, etc. There is no risk of errors (failures) occurring during the process, and the reliability of the device system can be significantly improved.

[Brief explanation of drawings]

FIGS. 1 and 2 are block diagrams showing a schematic configuration of an uninterrupted switching device to which different embodiments of the present invention are applied, and FIG. 3 is an explanation showing a bipolar signal output waveform in the -F device. 4 is a block diagram showing a general configuration of a conventional uninterrupted switching device, and FIG. 5 is an explanatory diagram showing a bipolar signal output waveform in the same device. 1 is a working side receiver, 2 is a backup side receiver, and 5a. 5b, 8a, 8b are U/B converters and U/C converters, 6a, 6b, 9a, 9b are bipolar signal polarity comparators, 7 is a switch, 7a is a make-before-break contact of the switch, A is a switch It is a command signal. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. 1° Luck■傅・1? Figure 2, Figure 9a, 9b', Bazojira 6 reading) Bamboo J News 1, Figure 3, Figure 5

Claims (1)

[Claims] Each receiver is equipped with a converter that converts a unipolar signal into a bipolar signal and outputs the bipolar signal, and the polarity of the signal output can be changed externally. The polarities of the signal output waveforms of each converter are compared, and if the polarities of both signal output waveforms do not match, the corresponding converter is controlled to match the polarity of the signal output waveform before switching to the polarity of the signal output waveform after switching. A receiver equipped with each bipolar signal polarity comparator that converts the polarity of the signal output waveform, and a switch having a make-before-break contact that switches the polarity-matched bipolar signals output from each receiver without momentary interruption. Various types of non-stop switching devices for machines.