GY GY/T198—2003 QAM Specificationsandmethodsofmeasurement on QAM modulator used in digital cable broadcasting system 行业标准信息服务平台 2003-12-19 2004-02-01 GY/T 198—2003 GY/T 170-2001 GY/T 106-1999 QAM QAM QAM 行业标准信息服务平台 GY/T 198—2003 QAM 1 GY/T 170-2001 GY/T 106-1999 QAM QAM 2 GY/T 106-1999 GY/T 170-2001 3 3.1 modulation error ratio dB 3.2 ASI Asynchronous Serial Interface PCR Program Clock Reference 信息服务平台 QAM Quadrature Amplitude Modulation SPI Synchronous Parallel Interface TS Transport Stream 4 QAM 1 19 GY/T 198—2003 1 QAM GY/T170-2001 1 一 2 64-QAM 256-QAM 3 pneqw 3.6 6.952 GY/T170-2001 A 4 110MHz 862MHZ 5 MHZ GY/T 106-1999 kHz ≤ 25 6 7 kHz ≤250 8 wap ≥ -8 9 2 75 -8dBm 10 gp ≥ 12 ≥ 32 -8dBm 6.875Mbaud 64-QAM 11 8p ≥ 30 256-QAM -8dBm 6.875Mbaud 12 gp ≥ 40 -8dBm 6.875 Mbaud 13 gp ≥ 50 @1kHz -8dBm ≤-65 14 dBc/Hz ≤-80 @10kHz ≤-100 @100kHz -8dBm 256-QAM 15 PCR ns ± 500 6.875Mbaud ASI BNC 752 16 SPI 25 ( ) 17 BNC F 752 一 5 5.1 5.1.1 3× 10~6 20