JPS62268231A - Digital transmission line - Google Patents

Abstract

PURPOSE:To attain low power consumption by constituting the titled circuit of a scrambler, a specific pattern generating circuit and a notice means to the sender side and of a descrambler and a detection circuit to the receiving side to instantly identify a significant communication state/nonsignificant communication state. CONSTITUTION:An information data string to be sent is subject to random coding by a scrambler 10 and outputted. A selection circuit 100 selects a code string to be sent in a code string from a specific pattern generating circuit 120 and the said former code string under the control of a control section 110. The selected code string is sent by a waveform sending circuit 30 and received by a waveform reception circuit 40. The received code string is descrambled by a descrambler 20 in pairs with the scrambler 10 and the result is sent as a reception information data string. A pattern with very low appearing probability is selected at the scrambling as the said specific pattern. A detection circuit 130 recognizes the nonsignificant communication state by the detection of the specific pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a digital transmission N-channel equipped with a scrambler on the transmitting side and a descrambler on the receiving side. The present invention relates to a digital transmission circuit that detects and notifies/recognizes an unexpected communication state during scrambler operation.

(Prior art) Conventionally, in order to distinguish between the 廗い通彃ｃstate and the ﾞﾞﾞ@ state, the first step is to operate the digital transmission circuit normally only during significant communication, and then to operate the digital transmission circuit during periods other than when there is significant fading. Second, the information data includes at least one bit of a signal indicating a significant communication state/unwanted communication state, and the state is mutually notified and recognized via the state display signal. There are known methods for doing so.

(Problem to be Solved by the Invention) In the first known technique described above, it is possible to suppress power consumption except during meaningful communication, but it is possible to suppress power consumption during periods other than during meaningful communication, but it is necessary to suppress power consumption by some method, for example, forming a power supply path, every time there is a communication request. It is necessary to start the digital transmission circuit by , I or inversion, and from starting the synchronization system and equalization system to normal operation,
The disadvantage is that it requires a fairly long training period.

On the other hand, in the above-mentioned second known technology example, although the state conversion between significant and non-significant is instantaneous, the status display bit must be accessed at all times, so the circuit remains the same even during non-significant communication as during significant communication. The disadvantage is that the same amount of power is consumed both in the valid state and in the non-significant state.

An object of the present invention is to eliminate the above-mentioned drawbacks by notifying and recognizing a significant communication state and an unintentional communication state by having a simple specific Bakoon generation circuit and a detection circuit, and to simultaneously achieve immediacy and low power consumption. It is an object of the present invention to provide a digital transmission circuit configured satisfactorily.

(Means for Solving the Problems) The digital transmission line according to the present invention consists of a transmitting side, a receiving side, and a transmission line connecting the transmitting side and the receiving side. It is possible to distinguish between a meaningful communication state in which information data is transmitted and received, and an unintentional communication state in which mere code strings that do not include meaningful information data are transmitted and received. The transmitting side includes a scrambler, a specific pattern generation circuit, and notification means, and the receiving side includes a descrambler and a detection circuit.

The scrambler randomly encodes an information data string to be transmitted and sends it out as a transmission signal via a transmission path.

The specific pattern generation circuit is for generating a specific pattern that has an extremely low probability of occurring during the operation of the scrambler.

The notification means is for notifying that an unexpected communication state is occurring by sending out a specific pattern to the transmission line by a specific pattern generation circuit.

The descrambler is for decoding the transmission signal generated by the scrambler to obtain an information data string.

The detection circuit is used to detect an unexpected communication state by detecting a specific pattern.

(Example) Next, the present invention will be explained with reference to the country.

FIG. 1 is a block diagram showing an embodiment of a digital transmission circuit according to the present invention. In FIG. 1, 1 is a transmission path, 10 is a scrambler, 20 is a descrambler, and 30
1 is a waveform transmitting circuit, 40 is a waveform receiving circuit, 100 is a selection circuit, 110 is a control section, 120 is a specific pattern generation circuit,
130 is a detection circuit.

In FIG. 1, an information data string to be transmitted on a signal line 50 is randomly encoded by a preset generator polynomial in a scrambler 10 and output. The selection circuit 100 selects a code string to be sent out of the code string from the specific pattern generation circuit 120 and the code string from the scrambler 10 in response to a control signal sent from the control unit 110 onto the signal line 115. The selected code string is sent to the transmission path 1 by the waveform transmitting circuit 30 and received by the waveform receiving circuit 40. The received code string from the waveform receiving circuit 40 is paired with the scrambler 10, is digitally crumpled by the descrambler 20 formed by the same generating polynomial, and is sent onto the signal line 60 as a received information data string.

It is assumed that the control unit 110 sets the control signal on the signal line 115 to, for example, logic ``1'' during a significant communication and outputs the control signal by setting it to a logic ``O'' during an unexpected communication.

FIG. 2 is a block diagram showing a detailed configuration example of the specific pattern generation circuit 120 and the selection circuit 100.

In FIG. 2, as the power specific pattern generated by the specific pattern generation circuit 120, a pattern with an extremely low probability of appearance during operation of the scrambler 10 may be selected, so for example, a pattern of all logic "l#" may be selected. It is a well-known phenomenon that the probability of occurrence of all logic @1'' in the operation of the scrambler 10 is extremely low, so a detailed explanation will be omitted.

The control unit 110 controls the significant i! Signal line 1 to him after 1st transmission
By setting the control signal on 15 to logic "0", a pattern of all logic 11" is sent out on the transmission line l, converting to an unexpected communication state, and notifying that an unexpected communication is in progress.

Upon generation of a communication request, the control unit 110 connects the signal line 115.
By setting the above control signal to logic "1" and sending out a random code string, conversion to a meaningful communication state is executed, and information data is sent out.

On the other hand, FIG. 3 is a block diagram showing a detailed embodiment of the detection circuit of FIG. 1. In FIG. 3, a detection circuit 130 has shift registers 132 and N A N
). As shown in the embodiment of FIG. 3, the detection signal on the signal line 135 becomes logic "0#" when an all logic "1" pattern is received, and becomes logic "1" when a non-all logic "L" pattern is received. becomes. Therefore, when the detection signal on the signal line 135 is logic "1", a valid communication state can be recognized, and when it is logic "0#", an unnecessary communication state can be recognized.

(Effects of the Invention) As explained above, the present invention improves the simple specific pattern generation circuit and one detection path to notify and recognize the significant communication state and the unintentional communication state.
This has the effect that notification of an unexpected communication state can be easily recognized.

As is clear from the above explanation, the scrambler and descrambler do not need to be operating during unsolicited communication. In other words, it is possible to suppress the power consumption of the circuits before and after the scrambler and the circuits after the descrambler in an unintentional communication state, and it is also possible to immediately realize a significant/unintentional state conversion.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of a digital transmission circuit according to the present invention. FIG. 2 is a block diagram showing details of the specific pattern generation path and selection circuit of FIG. 1. FIG. 3 is a block diagram showing details of the detection circuit of FIG. 1. l...Transmission line 10...Scrambler 20...
- Descrambler 30...Waveform transmission circuit 40...Waveform reception circuit 100...Selection circuit 110...Control unit 120
. . . A specific pattern is generated] Path 130 . . . Detection circuit 132 . . . Shift register 134 . . . NAND gate

Claims (1)

[Claims] It consists of a transmitting side, a receiving side, and a transmission line connecting the transmitting side and the receiving side, and a meaningful communication state in which significant information data is sent and received via the transmission line, and the meaningful information data is transmitted and received through the transmission line. In a digital transmission circuit that can distinguish between an unintentional communication state in which a simple code string is sent and received without any information, the transmitting side randomly encodes the information data string to be transmitted and sends it out as a transmission signal via the transmission path. a specific pattern generation circuit for generating a specific pattern that has an extremely low probability of occurring during operation of the scrambler; and a notification means for notifying that an unexpected communication state exists, and the receiving side decodes the transmission signal generated by the scrambler and transmitted through the transmission path to obtain the information data string. 1. A digital transmission circuit comprising: a descrambler for detecting the specific pattern; and a detection circuit for recognizing the unexpected communication state by detecting the specific pattern.