Rules for the Technical Engineering of Cable Radio and Television Systems Article 15

The signal quality at the subscriber terminal of each analog television channel of the system should conform to the following stipulations:1. Video carrier level shall be between 0 to +14 dBmV2. Carrier to noise ratio shall not be less than 43 dB3. Carrier to composite beat shall not be less than 53 dB4. Cross modulation ratio shall not be less than 46 dB5. Carrier-hum modulation ratio shall not be less than 40dB6. According to tolerated value of carrier beat ratio announced by the central administrative authority, each digital television channel of the system uses DVB-C standard; the signal quality at the subscriber terminal should conform to the following stipulations:1. The signal level shall be between -12 dBmV and +15 dBmV. When the digital TV channel is adjacent to the analog TV channel, the signal level shall be over 3 dB lower than the video carrier level of the analog television channel.2. The modulation error at 64 and 256 QAM shall not be less than 25 dB and 31dB.3. The difference of the signal level between the adjacent TV channels shall not be greater than 3 dB.4. The difference of the signal level shall not be greater than 8 dB in the 90MHz.5. After the signal is being decoded, its error bit rate shall be less than 0.0001 before the error bit of its digital signal series are being corrected.
中文原文 有線廣播電視系統工程技術管理辦法第15條
系統之每一類比電視頻道,在訂戶終端點之信號品質應符合下列各款之規定:
一、影像載波位準應介於0dBmV到正14dBmV間。
二、載波雜訊比不得小於43dB。
三、載波合成拍差比不得小於53dB。
四、串調變比不得小於46dB。
五、載波交流聲調變比不得小於40dB。
六、載波拍差比容許值依中央主管機關公告。
系統採DVB-C技術標準者,每一數位電視頻道,在訂戶終端點之信號品質應符合下列各款之規定:
一、信號位準應介於負12dBmV到正15dBmV間。
但受測之數位電視頻道如與類比電視頻道相鄰時,其信號位準須比類比電視頻道影像載波位準低3dB以上。
二、以64QAM調變之調變錯誤比不得小於25dB。
以256QAM調變之調變錯誤比不得小於31dB。
三、相鄰數位電視頻道間之信號位準差值不得大於3dB。
四、系統內任何90MHz頻段內,信號位準差值不得大於8dB。
五、信號經解調後在誤碼更正前其數位信號串之誤碼率應低於萬分之一。

English translation for reference only; the Chinese text prevails. Not legal advice.