Modem 常用AT指令集(19) -SDR=0 Disable Distinctive Ring. -SDR=1 Enable Distinctive Ring Type 1. -SDR=2 Enable Distinctive Ring Type 2. -SDR=3 Enable Distinctive Ring Type 1 and 2. -SDR=4 Enable Distinctive Ring Type 3. -SDR=5 Enable Distinctive Ring Type 1 and 3. -SDR=6 Enable Distinctive Ring Type 2 and 3. -SDR=7 Enable Distinctive Ring Type 1, 2, and 3. -SSE=n - Enable/Disable DSVD DSVD使能 -SSE=0 Disable DSVD. -SSE=1 Enable DSVD. ERROR DETECTION(察觉) AND DATA COMPRESSION(压缩) COMMANDS AT% Commands %C0 Disable data compression. %C1 Enable MNP 5 data compression. %C2 Enable V.42 bis data compression. %C3 Enable both V.42 bis and MNP 5 compression.