JP2576655B2 - Time-division directional control transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is used for a time-division directional control transmission device for eliminating the influence of near-end crosstalk on the home data line terminating device side.

〔Overview〕

The present invention provides a receiving means of an in-home data line terminating device constituting a time-division directional control transmission device, which receives data while avoiding a period affected by near-end crosstalk noise from another in-home data line terminating device adjacent to the own device. By doing so, it is possible to improve the stability of the receiving operation of the home data line terminating device.

[Prior Art] Conventionally, in this type of time-division directional control transmission device, an intra-office line termination device sends out a first training pattern for an in-home data line termination device, and For this reason, the receiving unit of the in-home data line termination device and the intra-office line termination device performs the receiving operation for each bit without recognizing the training pattern.

[Problems to be solved by the invention]

In such a conventional time-division directional control device, in particular, the home data line terminating device performs the receiving operation on all the received signals, so that, for example, the near-end crosstalk signal from the adjacent home data line terminating device is used. However, there is also a disadvantage that the receiving operation is performed and the operation of the home data line terminating device becomes unstable.

In particular, the problem of the near-end crosstalk signal is that, when the home data line termination device performs a transmission operation based on the training signal from the intra-office line termination device, a signal is also transmitted from another home data line termination device, This signal often occurs when the home data line terminal receives the signal. The present invention solves this problem.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a time-division directional control transmission device capable of performing a stable receiving operation without being affected by a near-end crosstalk signal.

[Means for solving the problem]

The present invention comprises an intra-office line termination device and a home data line termination device connected to the intra-office line termination device via a subscriber line, and the intra-office line termination device sends the data to the home data line termination device. Means for sending a first training pattern together with data, and said home data line terminating device includes a means for sending a second training pattern together with data to be sent to said intra-office line terminating device. In the transmission device, the in-home data line terminating device specifies a phase of the first training pattern to arrive and generates a timing signal for a period including the phase section, and a correlation detector that defines the timing signal. During the period excluding the period during which the second training pattern is transmitted, data from the above-mentioned intra-station line termination device is received. Characterized by comprising a reception circuit defined in periods.

[Action]

The correlation detector of the in-home data line terminator receives the timing signal including the period corresponding to the phase section obtained by specifying the phase of the training pattern transmitted together with the data from the in-station line terminator to its own receiver. The operation is valid only during this period. As a result, it is possible to restrict the reception operation, suppress near-end crosstalk noise from another intra-station line termination device adjacent to the own operation, and improve the stability of the reception operation.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of this embodiment. This embodiment includes an in-home data line termination device 1, a subscriber line 2, and an in-station line termination device 3, wherein the in-home data line termination device 1 includes a training pattern transmission circuit 11, a hybrid circuit 12, , A receiving unit 13, and a correlation detector 14, and the intra-station line termination device 3 includes a training pattern transmitting circuit 31, a hybrid circuit 32, and a receiving unit.
33. That is, in this embodiment, an intra-office line termination device 3 and an in-home data line termination device 1 connected to the intra-office line termination device 3 via the subscriber line 2 are provided. A training pattern sending circuit 31 is a means for sending a first training pattern together with data to be sent to the line terminating device 1. A training pattern sending circuit 11 which is a means for sending a training putter, further comprising, as a feature of the present invention,
The in-home data line termination device 1 includes a suppression unit that suppresses near-end crosstalk noise from another in-home data line termination device adjacent to the own device. Here, the suppression means is means for setting a period during which the receiving circuit 13 of the own device receives data from the intra-station line termination device 3 within a period excluding a period during which the second training pattern is transmitted, Means for specifying the phase of the first training pattern to arrive and generating a timing signal for a period including the phase section; and setting a period defined by the timing signal to a period for receiving data from the intra-station line termination device. A correlation detector 14 including means for determining the correlation.

Next, the operation of this embodiment will be described with reference to the time chart of FIG. In FIG.
Transmitted from the training pattern sending circuit 31 in synchronization with the phase of the training pattern, and together with the data, the home data line termination device 1
Received at. Further, is the data transmitted from the in-home data line termination device 1, is transmitted from the training pattern transmission circuit 31 in accordance with the phase of the training pattern, and is received by the intra-office line termination device 3 together with the data. The correlation detector 14 performs correlation detection on the training pattern signal from the intra-station line termination device 3 to specify the phase of the training signal. The output of the correlation detector 14 corresponds to the timing signal shown in FIG. The receiving unit 13 operates when the timing signal is at a high level. As a result, the influence of the near-end crosstalk noise from the adjacent home data line terminating device, which occurs during the period corresponding to the above, is removed.

〔The invention's effect〕

As described above, according to the present invention, the phase of the training signal is specified by the correlation detector, and the receiver is operated only in the phase section, so that the near-end crosstalk noise from the adjacent home data line terminating device is removed. Thus, there is an effect that the stable operation of the home data line terminating device can be maintained.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a timing chart showing the operation of the embodiment of the present invention. 1 ... home data line terminator, 2 ... subscriber line, 3
... Intra-office line termination equipment, 11, 31 ... Training pattern sending circuit, 12, 32 ... Hybrid circuit, 13, 33 ...
Receiver, 14 ... Correlation detector.

Claims (1)

(57) [Claims] 1. An intra-office line termination device and a home data line termination device connected to the intra-office line termination device via a subscriber line, and the intra-office line termination device sends the data to the home data line termination device. Means for transmitting a first training pattern prior to data to be transmitted, and the home data line termination device comprises means for transmitting a second training pattern prior to data to be transmitted to the intra-office line termination device. A time-division directional control transmission device, wherein the in-home data line terminating device specifies a phase of the first training pattern to arrive and generates a timing signal for a period including the phase interval; The period excluding the period during which the second training pattern specified by the signal is transmitted is the data from the intra-station line termination device. A time-division directional control transmission device, comprising: a reception circuit determined during a period for receiving data.