JP3898201B2 - DSL line detector - Google Patents

Description

  The present invention relates to a DSL line detector that can detect a DSL line even when the power of the modem is turned off or when the modem is not connected to the DSL line.

  An ADSL (Asymmetric Digital Subscriber Line) line is one of communication lines (referred to as lines) classified as DSL (Digital Subscriber Line) lines. From the station's DSLAM (Digital Subscriber Line Access Multiplexer), MDF (Main Distribution Frame) ) And via a pole (electric pole), it is connected to an ADSL modem at the user's house. The ADSL line wired in this way is bundled and wired together with a number of lines such as an ADSL line and a general telephone line to other users' homes. ADSL lines include those shared with general telephone lines and dedicated ones, and these are bundled and wired without distinction.

  In addition, it may be necessary to replace the ADSL line or remove the jumper line that forms a part of the ADSL line due to user requests or construction work. It is necessary to find out the target ADSL line.

Since the dial tone from the exchange is superimposed on the ADSL line shared with the general telephone line or the line used only as a general telephone line, the line is detected by a detector that detects this dial tone. be able to. The dedicated ADSL line can be detected by a detector (see Non-Patent Documents 1 and 2) that detects communication between the DSLAM and the ADSL modem.
ADSL line identifier IAC-A: Takachiho Sangyo Co., Ltd. [online], [Search August 25, 2004], Internet <URL: http://www.takachiho-sc.co.jp/iac_a.html> Line checker: Oi Electric Co., Ltd., [online], [Search August 25, 2004], Internet <URL: http://www.ooi.co.jp/manufact/keisoku/html/ma_k051.html>

  However, since the detectors described in Non-Patent Documents 1 and 2 detect communication between the DSLAM and the ADSL modem, the power of the ADSL modem is turned off as shown in FIG. In this case, as shown in FIG. 4B, it cannot be used when the ADSL modem is not connected to the ADSL line. Therefore, it is necessary to find the ADSL line by using a wire number target book or the like, which takes a long time.

  The present invention has been made in view of the above problems, and the object of the present invention is to connect the DSL line even when the modem is turned off or when the modem is not connected to the DSL line. It is to provide a DSL line detector capable of detection.

  In order to solve the above problems, the present invention of claim 1 is a DSL line detector that attempts to detect a DSL line and displays the result on a predetermined display device, from a DSLAM connected to the DSL line. The line type information table in which the carrier frequency of the handshake signal sent to the DSL line and the line type information indicating the line type of the DSL line are associated with each other and the line type information table is sent to an unknown line. A carrier detection unit that detects a carrier of the signal, and searches for line type information associated with the carrier frequency of the detected carrier in the line type information table; An DSL line detector comprising an analysis display control unit for displaying on the display device whether or not is a DSL line.

  According to the present invention of claim 1, a line in which a carrier frequency of a handshake signal transmitted from a DSLAM connected to the DSL line to the DSL line is associated with line type information indicating the line type of the DSL line A type information table, a carrier detection unit that detects a carrier of a signal transmitted to a line that is unknown whether it is a DSL line, and a line type that is associated with the carrier frequency of the detected carrier in the line type information table It is necessary to detect communication between the DSLAM and the modem by providing an analysis display control unit that displays on the display device whether or not the line is a DSL line depending on whether or not the information has been retrieved. Therefore, the DSL line can be detected even when the modem is not connected to the DSL line or when the modem is turned off.

  According to a second aspect of the present invention, the analysis display control unit displays the contents according to the retrieved line type information, and the DSL line detector according to the first aspect is used as the solving means.

  According to the second aspect of the present invention, the analysis display control unit displays the contents corresponding to the retrieved line type information, so that the line type can be known.

  According to a third aspect of the present invention, the DSLAM transmits a handshake signal having a plurality of carriers, and the DSL line detector is configured to associate the plurality of carrier frequencies with the line type information. The line type information table associates the table, the carrier detection unit that detects a plurality of carriers included in a signal transmitted to a line whose DSL line is unknown, and the carrier frequencies of the detected plurality of carriers. The DSL line detector according to claim 1, further comprising the analysis display control unit that searches for the received line type information.

  According to the present invention of claim 3, in the line type information table, a plurality of carrier frequencies and line type information are associated with each other, and the carrier detection unit sends a signal sent to a line whose channel is unknown whether it is a DSL line or not. And the analysis display control unit searches the line type information associated with the line type information table for the carrier frequencies of the detected multiple carriers. A DSL line to which a shake signal is transmitted can be detected.

  According to the present invention of claim 4, the DSLAM transmits a handshake signal when a handshake signal having a plurality of predetermined carrier frequencies is transmitted to the DSL line, and the DSL line detector 4. A carrier generating unit for generating a signal having a plurality of carrier frequencies, and a handshake signal transmitting unit for transmitting the generated signal as a handshake signal to the line. The DSL line detector described above is used as a solution.

  According to the present invention of claim 4, the DSLAM sends a handshake signal when a handshake signal having a plurality of predetermined carrier frequencies is sent to the DSL line. The DSLAM includes a carrier generation unit that generates a signal having a plurality of carrier frequencies and a handshake signal transmission unit that transmits the generated signal as a handshake signal to a line that is unknown as to whether it is a DSL line. Even when the handshake signal is not sent by itself, the DSL line can be detected.

  According to the DSL line detector of the present invention, the carrier frequency of the handshake signal transmitted from the DSLAM connected to the DSL line to the DSL line is associated with the line type information indicating the line type of the DSL line. A line type information table, a carrier detection unit for detecting a carrier of a signal transmitted to a line for which it is unknown whether it is a DSL line, and a line associated with the carrier frequency of the detected carrier in the line type information table The communication between the DSLAM and the modem is detected by providing an analysis display control unit that searches the display device whether the line is a DSL line or not according to whether or not the type information is searched. Because it is not necessary, the DSL line can be detected even if the modem is not connected to the DSL line or the modem is turned off. That.

  Also, the analysis display control unit displays the contents according to the searched line type information, so that the line type can be known.

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

  FIG. 1 is a diagram showing a configuration of a DSL line detector 1 in the present embodiment.

  The DSL line detector 1 determines whether or not the line whose DSL line is unknown is a DSL line (attempts to detect the DSL line), and provides the result in, for example, the DSL line detector 1 It is a detector to be displayed on the displayed display device 11. The display device 11 can be composed of, for example, a liquid crystal panel. The DSL line here is, for example, an ADSL line.

  The DSL line detector 1 includes a line type information table 12 in which the carrier frequency of the handshake signal transmitted from the DSLAM to the DSL line is associated with the line type information indicating the line type of the DSL line, and whether the DSL line is a DSL line. A carrier detection unit 13 for detecting a carrier of a signal transmitted to the line 100 whose unknown is detected, a carrier demodulation unit 14 for demodulating information modulated on the detected carrier, and a line type for the detected carrier frequency. The line type information associated with the information table 12 is searched, and an analysis display control unit 15 for displaying on the display device 11 whether or not the line is a DSL line depending on whether or not the search is successful, and a plurality of carrier frequencies. A carrier generating unit 16 for generating a signal having a predetermined modulation on the generated signal and using this as a handshake signal DSL And a handshake signal sending unit 17 or a line or not is sent to the unknown line.

  FIG. 2 is a diagram for explaining the configuration and setting contents of the line type information table 12. Specifically, it is a diagram showing a method classified by the xDSL recommendation and frequency numbers and frequencies of an uplink carrier group and a downlink carrier group corresponding to each method.

  In the DSL line corresponding to Annex A which is the xDSL recommendation, the carrier frequencies of the handshake signals (downstream carrier group) transmitted from the DSLAM to the DSL line are 172.5 kHz, 241.5 kHz and 276 kHz. It is set in the line type information table 12 in association with line type information (for example, Annex A) indicating the line type corresponding to Annex A. Further, in the DSL line corresponding to Annex B, the carrier frequencies of the downlink carrier group are 310.5 kHz, 379.5 kHz, and 414 kHz, so that these carrier frequencies indicate line type information (for example, the line type corresponding to Annex B) (for example, It is set in the line type information table 12 in association with Annex B). In addition, in the DSL line corresponding to Annex C, the carrier frequencies of the downlink carrier group are 51.75 kHz, 60.375 kHz, and 276 kHz, so that these carrier frequencies indicate the line type information (for example, the line type corresponding to Annex C) (for example, It is set in the line type information table 12 in association with Annex C).

  Further, for example, when a handshake signal (upstream carrier group) recommended by Annex C is sent to the DSL line, the DSLAM sends a handshake signal (downstream carrier group) corresponding to the DSL line. The carrier generation unit 16 generates a signal having a plurality of carrier frequencies included in the uplink carrier group, and the handshake signal transmission unit 17 performs a predetermined modulation on the generated signal and converts the generated signal into a handshake signal (uplink carrier wave). Group) is sent to the line 100 whose DSL line is unknown.

  Note that, for example, even if an upstream carrier group recommended by Annex C is transmitted, DSLAM uses a downstream carrier group recommended by Annex A if the DSL line is a DSL line corresponding to Annex A. As long as the upstream carrier group is recommended by the xDSL recommendation, such as transmitting, the downstream carrier group corresponding to the DSL line to which the upstream carrier group is connected is transmitted. It is only necessary to generate a signal having a carrier frequency corresponding to.

  Next, the operation of the DSL line detector 1 will be described.

  FIG. 2 is a diagram showing a sequence in a case where the line 100, which is unknown whether it is a DSL line, is a DSL line. Since the line 100 is a DSL line, a DSLAM is connected to the line.

  First, the carrier generation unit 16 generates a signal having a carrier frequency corresponding to Annex C, for example, and the handshake signal transmission unit 17 performs a predetermined modulation on the generated signal, and this is converted into a handshake signal ( R-TONE-REQ), that is, an uplink carrier wave group is transmitted to the DSL line (step S1). The DSLAM receives the handshake signal (R-TONE-REQ) (step S3), and transmits the handshake signal (C-TONES) corresponding to the line type of the line 100 (DSL line), that is, the downlink carrier group to the line 100 ( DSL line) (step S5), and this is received by the DSL line detector 1 (step S7). Up to this point, it is defined in the JT-G994.1 handshake procedure.

  Note that once the handshake signal (C-TONES) is received, the subsequent communication with the DSLAM is unnecessary, so the transmission of the handshake signal (R-TONE-REQ) is stopped (step S9).

  Next, the carrier detection part 13 detects the carrier (plurality) of the received handshake signal (C-TONES) (step S11). Further, the carrier demodulator 14 demodulates information modulated on the detected carrier. Further, the analysis display control unit 15 searches for the line type information associated with the detected plurality of carrier frequencies in the line type information table 12 (step S11). Then, the analysis display control unit 15 causes the display device 11 to display whether or not the line 100 is a DSL line depending on whether or not the line type information has been retrieved (S13).

  Here, since the line 100 is a DSL line, the analysis display control unit 15 can search for the line type information associated with the detected carrier frequency in the line type information table 12, for example, the line type information Display information (for example, “This line is an Annex C line”) is displayed on the display device 11 to indicate that the line 100 is a DSL line. Therefore, the user can know that the line 100 is a DSL line.

  Note that even if the DSLAM does not receive the handshake signal (R-TONE-REQ), the DSLAM detector 1 may transmit the handshake with the carrier generator 16 because the handshake signal (C-TONES) may be transmitted. The signal transmission unit 17 may not be provided.

  Up to this point, it has been described that the line 100 is a DSL line. However, when the line 100 is not a DSL line, since the DSLAM is not connected to the line, the DSL line detector 1 detects the handshake signal (C-TONES). ) Cannot be received (step S7), carrier detection cannot be performed, and therefore the line type information cannot be searched. Therefore, the analysis display control unit 15 causes the display device 11 to display the line 100 if the line 100 is not a DSL line. Display.

  As described above, according to the DSL line detector 1, the line type information table in which the carrier frequency of the handshake signal and the line type information indicating the line type of the DSL line are associated with each other, and whether the line is a DSL line is unknown. A carrier detection unit that detects a carrier of a signal sent to a simple line, and searches for the line type information associated with the carrier frequency of the detected carrier in the line type information table, depending on whether the search is successful In addition, since an analysis display control unit that displays whether or not the line is a DSL line is provided on the display device, it is not necessary to detect communication between the DSLAM and the modem, so the modem is connected to the DSL line. The DSL line can be detected even when there is no communication or when the modem is turned off.

  Further, the analysis display control unit 15 displays the contents according to the searched line type information, so that the line type can be known. The line type information table associates a plurality of carrier frequencies with line type information, and the carrier detection unit detects a plurality of carriers included in a signal sent to a line with an unknown DSL line. The analysis display control unit searches the line type information associated with the carrier type information table for the detected carrier frequencies of the plurality of carriers, and therefore, the DSL line through which a handshake signal having a plurality of carriers is transmitted. Can be detected.

  The DSLAM is to send a handshake signal when a handshake signal having a plurality of carrier frequencies is sent to the DSL line, and the DSL line detector 1 generates a signal having the plurality of carrier frequencies. Since it has a carrier generation unit and a handshake signal transmission unit that transmits the generated signal as a handshake signal to a line whether or not it is a DSL line, even when the DSLAM does not transmit a handshake signal by itself, DSL lines can be detected.

It is a figure which shows the structure of the DSL line | wire detector 1 in this Embodiment. It is a figure for demonstrating the structure and setting content of the line classification information table. It is a figure which shows a sequence in case the line 100 in which it is unknown whether it is a DSL line is a DSL line. FIG. 4A is a circuit diagram when the power of the ADSL modem is turned off, and FIG. 4B is a circuit diagram when the ADSL modem is not connected to the ADSL line.

Explanation of symbols

1 DSL Line Detector 11 Display Device 12 Line Type Information Table 13 Carrier Detection Unit 14 Carrier Demodulation Unit 15 Analysis Display Control Unit 16 Carrier Generation Unit 17 Handshake Signal Transmission Unit

Claims (4)

A DSL line detector that attempts to detect a DSL line and displays the result on a predetermined display device;
A line type information table in which a carrier frequency of a handshake signal transmitted from the DSLAM connected to the DSL line to the DSL line is associated with line type information indicating the line type of the DSL line;
A carrier detection unit that detects a carrier of a signal transmitted to a line that is unknown whether it is a DSL line;
The line type information associated in the line type information table is searched for the carrier frequency of the detected carrier, and whether or not the line is a DSL line is determined in the display device according to whether or not the search has been made. A DSL line detector comprising: an analysis display control unit for displaying.   The DSL line detector according to claim 1, wherein the analysis display control unit displays contents according to line type information that can be searched. The DSLAM sends a handshake signal having a plurality of carriers;
DSL line detector
The line type information table in which a plurality of carrier frequencies and line type information are associated;
The carrier detection unit for detecting a plurality of carriers included in a signal transmitted to a line with an unknown DSL line;
3. The DSL line according to claim 1, further comprising: the analysis display control unit that searches for line type information associated with the detected carrier frequencies of a plurality of carriers in a line type information table. Detector. The DSLAM sends a handshake signal when a handshake signal having a plurality of predetermined carrier frequencies is sent to the DSL line,
DSL line detector
A carrier generator for generating a signal having the predetermined plurality of carrier frequencies;
The DSL line detector according to claim 1, further comprising: a handshake signal sending unit that sends the generated signal to the line as a handshake signal.

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