IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0314284
(2002-12-09)
|
우선권정보 |
JP-0373989 (2001-12-07); JP-0377257 (2001-12-11); JP-0030979 (2002-02-07) |
발명자
/ 주소 |
- Yoshida, Hideo
- Mihara, Yoshikazu
|
출원인 / 주소 |
- Fuji Photo Optical Co., Ltd.
|
대리인 / 주소 |
Birch, Stewart, Kolasch & Birch, LLP
|
인용정보 |
피인용 횟수 :
1 인용 특허 :
3 |
초록
▼
A correlation value calculation is performed by using AF data arranged at predetermined intervals in the AF data in a pair of window ranges, so that a frequency of calculation can be reduced. On the other hand, a correlation value calculation is performed by using all the AF data in the pair of wind
A correlation value calculation is performed by using AF data arranged at predetermined intervals in the AF data in a pair of window ranges, so that a frequency of calculation can be reduced. On the other hand, a correlation value calculation is performed by using all the AF data in the pair of window ranges only in predetermined ranges before and after the shift amount of the pair of window ranges when the highest correlation value in the correlation values is obtained, thereby suppressing a reduction in measurement precision. For example, in a pair of the AF data obtained from a pair of window ranges, the correlation value calculation is performed by using every third piece of the AF data. Then, the correlation value calculation (normal calculation) is performed by using all the AF data in the pair of window ranges in predetermined ranges (range for re-performing the calculation) before and after the shift amount of the pair of window ranges when the highest correlation value is obtained in the correlation values obtained by the former correlation value calculation.
대표청구항
▼
A correlation value calculation is performed by using AF data arranged at predetermined intervals in the AF data in a pair of window ranges, so that a frequency of calculation can be reduced. On the other hand, a correlation value calculation is performed by using all the AF data in the pair of wind
A correlation value calculation is performed by using AF data arranged at predetermined intervals in the AF data in a pair of window ranges, so that a frequency of calculation can be reduced. On the other hand, a correlation value calculation is performed by using all the AF data in the pair of window ranges only in predetermined ranges before and after the shift amount of the pair of window ranges when the highest correlation value in the correlation values is obtained, thereby suppressing a reduction in measurement precision. For example, in a pair of the AF data obtained from a pair of window ranges, the correlation value calculation is performed by using every third piece of the AF data. Then, the correlation value calculation (normal calculation) is performed by using all the AF data in the pair of window ranges in predetermined ranges (range for re-performing the calculation) before and after the shift amount of the pair of window ranges when the highest correlation value is obtained in the correlation values obtained by the former correlation value calculation. rate. If successful, then, the CO reads the upstream SNR and based on this attempts to maximize the upstream rate. Line quality is then monitored and adjusted as necessary. cell in an ATM layer; storage means connected to the OAM cell detecting means for keeping a timer counter value and failed state information for each virtual path or channel; timer incrementing means connected to the storage means for incrementing the timer counter value independently of a cell receiving period and for keeping, when the timer counter value exceeds a predetermined period of time equal to or less than one second, the timer counter value unchanged; timer counter comparing means connected to the OAM cell detecting means for comparing the timer counter value measuring a predetermined period of time equal to or less than one second after reception of the OAM cell with a reference value and for generating a discard signal only when the timer counter value is less than the reference value; failed state monitoring means connected to the OAM cell detecting means and the storage means for detecting the OAM cell for each virtual path or channel and for setting a failed state flag indicating failed state information of the storage means to "1"; and cell discarding means connected to the OAM cell detecting means, the storage means, the timer counter comparing means, and the failed state monitoring means for discarding, when the discard signal is received from the timer counter comparing means, the OAM cell from the OAM cell detecting means and for thereby generating an empty cell. 2. An OAM cell detecting apparatus for detecting an OAM cell in a ATM layer in an ATM network in which a station is connected to a plurality of stations, comprising: OAM cell detecting means for detecting an OAM cell in an ATM layer; storage means connected to the OAM cell detecting means for keeping a failed state flag, failed state information, and failed position display change flag for each virtual path or channel; failed state monitoring means connected to the OAM cell detecting means and the storage means for detecting the OAM cell for each virtual path or channel and for setting a failed state flag indicating failed state information of the storage means to "1"; failed position display and comparator means connected to the OAM cell detecting means and the storage means; and cell discarding means connected to the OAM cell detecting means, the storage means, the failed state monitoring means, and the failed position display and comparator means for discarding, when the discard signal is received from the failed position display and comparator means, the OAM cell from the OAM cell detecting means and for thereby generating an empty cell, wherein: the failed position display and comparator means stores failed position display information included in the OAM cell in the storage means for each virtual path or channel; the failed position display and comparator means compares, when the failed position display change flag is "0", failed position display information of the OAM cell from the OAM cell detecting means with failed position display information previously stored; the failed position display and comparator means generates, when the comparison results in mismatching, the discard signal and feeds the signal to the cell discarding means; the failed position display and comparator means compares, when the failed position display change flag of the storage means is set to "1" by externally controlled firmware or software, the failed position display information of the OAM cell from the OAM cell detecting means with the failed position display information previously stored, and does not generate a discard signal even when the comparison results in mismatching; and the failed position display and comparator means then updates the failed position display information previously stored in the storage means to the failed position display information of the OAM cell from the OAM cell detecting means and sets the failed position display change flag to "0". 3. An OAM cell detecting apparatus for detecting an OAM cell in an ATM lay er in an ATM network in which a station is connected to a plurality of stations, comprising: OAM cell detecting means for detecting an OAM cell in an ATM layer; storage means connected to the OAM cell detecting means for keeping a timer counter value, a failed state flag, failed state information, and a failed position display change flag for each virtual path or channel; timer incrementing means connected to the storage means for incrementing the timer counter value independently of a cell receiving period and for keeping, when the timer counter value exceeds a predetermined period of time equal to or less than one second, the timer counter value unchanged; timer counter comparing means connected to the OAM cell detecting means for comparing the timer counter value measuring a predetermined period of time equal to or less than one second after reception of the OAM cell with a reference value and for generating a discard signal only when the timer counter value is less than the reference value; failed state monitoring means connected to the OAM cell detecting means and the storage means for detecting the OAM cell for each virtual path or channel and for setting a failed state flag indicating failed state information of the storage means to "1"; failed position display and comparator means connected to the OAM cell detecting means and the storage means; and cell discarding means connected to the OAM cell detecting means, the storage means, the timer counter comparing means, the failed state monitoring means, and the failed position display and comparator means for discarding, when the discard signal is received from the timer counter comparing means or the failed position display and comparator means, the OAM cell from the OAM cell detecting means and for thereby generating an empty cell, wherein the failed position display and comparator means stores failed position display information included in the OAM cell in the storage means for each virtual path or channel; the failed position display and comparator means compares, when the failed position display change flag is "0", failed position display information of the OAM cell from the OAM cell detecting means with failed position display information previously stored; the failed position display and comparator means generates, when the comparison results in mismatching, the discard signal and feeds the signal to the cell discarding means; the failed position display and comparator means compares, when the failed position display change flag of the storage means is set to "1" by externally controlled firmware or software, the failed position display information of the OAM cell from the OAM cell detecting means with the failed position display information previously stored, and does not generate a discard signal even when the comparison results in mismatching; and the failed position display and comparator means updates the failed position display information previously stored in the storage means to the failed position display information of the OAM cell from the OAM cell detecting means and sets the failed position display change flag to "0". 4. An OAM cell detecting method of detecting an OAM cell in an ATM layer in an ATM network in which a station is connected to a plurality of stations, comprising the steps of: detecting an OAM cell in an ATM layer by OAM cell detecting means; keeping a timer counter value and failed state information for each virtual path or channel by storage means; incrementing by timer incrementing means the timer counter value independently of a cell receiving period and keeping, when the timer counter value exceeds a predetermined period of time equal to or less than one second, the timer counter value unchanged; comparing by timer counter comparing means the timer counter value measuring a predetermined period of time equal to or less than one second after reception of the OAM cell with a reference value and generating a discard signal only when the timer counter value is less than the reference value; detecting the OAM cell for each virtual path or channel and setting a failed state flag indicating failed state information of the storage means to "1" by failed state monitoring means; and discarding, when the discard signal is received from the timer counter comparing means, the OAM cell from the OAM cell detecting means and for thereby generating an empty cell by cell discarding means. 5. An OAM cell detecting method of detecting an OAM cell in an ATM layer in an ATM network in which a station is connected to a plurality of stations, comprising the steps of: detecting an OAM cell in an ATM layer by OAM cell detecting means; keeping a failed state flag, failed state information, and a failed position display change flag for each virtual path or channel by storage means; detecting the OAM cell for each virtual path or channel and setting a failed state flag indicating failed state information of the storage means to "1" by failed state monitoring means; storing failed position display information included in the OAM cell for each virtual path or channel in the storage means by failed position display and comparator means; comparing by the failed position display and comparator means, when the failed position display change flag is "0", failed position display information of the OAM cell from the OAM cell detecting means with failed position display information previously stored and generating, when the comparison results in mismatching, the discard signal and feeding the signal to the cell discarding means; comparing by the failed position display and comparator means, when the failed position display change flag of the storage means is set to "1" by externally controlled firmware or software, the failed position display information of the OAM cell from the OAM cell detecting means with the failed position display information previously stored, generating no discard signal even when the comparison results in mismatching, updating the failed position display information previously stored in the storage means to the failed position display information of the OAM cell from the OAM cell detecting means, and setting the failed position display change flag to "0"; and discarding by cell discarding means, when the discard signal is received from the failed position display and comparator means, the OAM cell from the OAM cell detecting means and for thereby generating an empty cell. 6. An OAM cell detecting method of detecting an OAM cell in an ATM layer in an ATM network in which a station is connected to a plurality of stations, comprising the steps of: detecting an OAM cell in an ATM layer by OAM cell detecting means; keeping a timer counter value, a failed state flag, failed state information, and a failed position display change flag for each virtual path or channel by storage means; incrementing by timer incrementing means the timer counter value independently of a cell receiving period and keeping, when the timer counter value exceeds a predetermined period of time equal to or less than one second, the timer counter value unchanged; comparing by timer counter comparing means the timer counter value measuring a predetermined period of time equal to or less than one second after reception of the OAM cell with a reference value and generating a discard signal only when the timer counter value is less than the reference value; detecting the OAM cell for each virtual path or channel and setting a failed state flag indicating failed state information of the storage means to "1" by failed state monitoring means; storing by a failed position display and comparator means failed position display information included in the OAM cell in the storage means for each virtual path or channel; comparing by the failed position display and comparator means, when the failed position display change flag is "0", the failed position display information
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