Similar Pages

Transcript

Digital Modulators QAM Modulator Introduction QAM (Quadrature Amplitude Modulation) 변조방식을 채택한 QAM변조기로서 Transport Stream (DVB-ASI)신호를 입력 받아 CATV 대역전송에 적합한 주파수 대역으로 출력하는 고품질 QAM Modulator이다. 64, 256QAM의 ITU-T (J.83) ANNEX A. B or C 규격의 변조모드를 지원하며, Up Converter 내장형으로 출력 주파수 대역을 자유롭게 선택 할 수 있다. QAM Modulator DQM-3908ML Features • 최대 8CH의 DQM-3900 Module을 수용하며 전원부 및 Module Control부로 구성 • TEST Pattern (PRBS) 기능 제공 • PCR C Re-Stamping S i • 12%, 15%, 18%, Roll off Factor 지원 • DVB-ASI 표준 인터페이스 제공 • Jog & Shuttle 방식에 의한 기능조절로 미세조정에 우수하며 습기 등 환경변화에 조정상태 변화가 없다. • LCD Display에 의한 편리한 Control기능 · Input Mode Setting · Data Rate / Symbol Rate, Data Clock 설정 · Interleave / Roll-Off / Spectrum Data 설정 · Output Frequency / Level Control · TV / CATV Band 선택기능 • NMS를 위한 Ethernet SNMP기능 • 3RU, 표준형 19” Rack Mount Type DQM 1903ML DQM-1903ML Features • • • • • TEST Pattern (PRBS) 기능 제공 PCR Re-Stamping 12%, 15%, 18%, Roll off Factor 지원 DVB-ASI 표준 인터페이스 제공 VFD Display에 의한 편리한 Control기능 · Input Mode Setting · Data Rate / Symbol Rate, Data Clock 설정 · QAM Modulation 설정 (64, 256QAM) · Interleave / Roll-Off / Spectrum Data 설정 · Output Frequency / Level Control · TV / CATV Band 선택기능 • NMS를 위한 Ethernet SNMP기능 • 1RU, 표준형 19” Rack Mount Type Internal Block Diagram 46 DQM-3908ML / DQM-1903ML ITEM Digital Input DQM-3908ML DQM-1903ML Transport Stream DVB-ASI DVB-ASI Input Channel 8 CH 1 CH Connector BNC (75Ω) BNC (75Ω) DATA VIEW Packet Format 188/204 Byte 188/204 Byte IF Roof Frequency Range 41~47 MHz 41~47 MHz Return Loss ≥ 16 dB ≥ 16 dB QAM Signal Coding ITU-T(J.83) Annex A,B or C ITU-T(J.83) Annex A,B or C Symbol rate (ITU-A, C) 1~7 Mbps 1~7 Mbps Symbol rate (ITU-B) 1~5.5 Mbps 1~5.5 Mbps QAM Modulation 64, 256 QAM 64, 256 QAM RF Output O F Frequency Range R 54 870 MHz 54~870 MH 54 870 MHz 54~870 MH Impedance 75 Ω 75 Ω Output Level 55 ± 5 dBmV 55 ± 5 dBmV Bandwidth 6 or 8 MHz 6 or 8 MHz Return Loss ≥ 15 dB ≥ 15 dB MER After Equalizer 41 dB 42 dB MER Before Equalizer 36 dB 37 dB Signal to Noise Ratio ≥ 50 dB ≥ 50 dB VHF -105 dB@20KHz UHF -103 dB@20KHz ≤ -63 dB VHF -105 dB@20KHz UHF -103 dB@20KHz ≤ -63 dB Phase Noise Spurious Ethernet General RF Output Frequency Response & Group Delay PCR Jitter ≤ ± 200 ns ≤ ± 200 ns Connector F Type F Type Tuning Step 25 KHz 25 KHz Frequency Stability ± 3 ppm ± 3 ppm Connector RJ-45 RJ-45 Interface Type 10/100 Base-T 10/100 Base-T Protocols SNMP SNMP Power Requirements AC 90~230V, 60Hz AC 90~230V, 60Hz Power Consumption Max. 245 W Max. 43 W QAM Constellation Weight 22 Kg 3.8 Kg Dimensions 482 x 133 x 300 mm 482 x 44 x 337 mm Si Signal l tto N Noise i R Ratio ti Drawing 431 AC90~230V 50/60Hz AC90~230V 50/60Hz ETHERNET RF OUT MONITOR ASI IN RF OUT RF OUT RF OUT RF OUT RF OUT ASI IN ASI IN QAM MODULATOR DQM-3900 QAM MODULATOR DQM-3900 ASI IN ASI IN ASI IN QAM MODULATOR DQM-3900 QAM MODULATOR DQM-3900 RF OUT RF OUT RF OUT USB ETHENET QAM MODULATOR DQM-3900 ASI IN QAM MODULATOR DQM-3900 ASI IN QAM MODULATOR DQM-3900 337 POWER SUPPLY & CONTROLLER HST-3000 QAM MODULATOR DISPLAY FUNCTION MENU ENT DOWN UP ACTIVE UP ESC SYNCERR QAM MODULATOR RF OUT DQM-1903ML LEFT ENT MENU DOWN 482 DQM-3908ML DQM-1903ML 47 RIGHT 44 DQM-3908ML Digital Pro oducts Specifications ASI IN QAM MODULATOR DQM-3900