Description
WDQ-3244 4 in 1 QAM is a new compact (1RU only) chassis and cost-effective QAM modulator, which is designed by Hangzhou Prevail according to the DVB related standards. This device is integrated up to 4 channel QAM modulating carrier outputs, in which each carrier has independent signal channel encoding and direct RF output. Hence, one PCS 4 in 1 QAM modulator can work as 4 standalone QAM modulators, significantly reducing the network operators' head-end cost. WDQ-3244 has 4 ASI input, RF output and RF testing output. The WDQ-3244 has very convenient and friendly management interface, the user can complete all operation via local keyboard and LCD display on device, or access through the Ethernet port on device.
Features
4 adjacent channel QAM carrier4 ASI inputs,TS packet format input automatic detection (188 or 204 bytes)
RF output power 90~100dBuV ( with 0~10dB adjustable attenuation range) and 48~863MHz frequency range
16~256QAM modulation modes
Provide RF output monitoring port (-20dB)
Adjustable Symbol Rate: 5 to 7Mbaud
PSI/SI tables synchronization update
Excellent RF output performance, MER≥40dB
Memory protection for power-fail
Local keyboard control and LCD display, or access via Ethernet link
Application
DVB-C QAM modulation
Compatible
EN 50083-9
ETSI TR 101 154
ETSI TR 101 891
EN 300 429(DVB-C)
ITU-T J.83A
Recommended Operating Conditions
Stress in excess of the maximum absolute ratings can cause permanent damage to the device (See Table 1)
Table 1 - Recommended Operating Conditions
| Parameter | Symbol | Min. | Max. | Unit |
| Supply Voltage Note | V | 90 | 250 | V |
| Supply Frequency | F | 49 | 51 | Hz |
| power consumption | C | 40 | W | |
| Ambient Operating Temperature | Tw | 0 | +50 | °C |
| Storage Temperature | Ts | -25 | +55 | °C |
| Operating Humidity | H | 10 | 75 | % |
Specifications
Table 2 - Technical Specifications| Parameter | Symbol | Description | Unit | Remark |
| Mechanical dimension | ||||
| Height | H | 42 | mm | About 1U |
| Width | W | 434 | mm | About 17" |
| Depth | D | 340 | mm | |
| ASI Input | ||||
| Number of ASI input | - | 4 | ||
| Impedance | - | 75 | W | |
| Connector | - | BNC | NA | |
| TS packet format | - | 188 or 204 | Byte | Automatic detection |
| Transmission format | - | Data packet | NA | |
| RF Output | ||||
| Impedance | - | 75 | W | |
| Connector | - | BNC | NA | |
| Frequency | - | 48~863 | MHz | |
| Output level | - | 90~100 | dBuV | Adjustable attenuation of 0~10dB |
| Modulation Specification | ||||
| Modulation scheme | - | 16/32/64/128/256QAM | NA | |
| Symbol Rate | SR | 5≤SR≤7 | Mbaud | |
| Bandwidth | BW | ≤8 | MHz | |
| Modulation Error Rate | MER | ≥40 | dB | After equalizer, 64QAM |
| Bit Error Rate | BER | ≤1x10E-8 | After FEC, 64QAM | |
| Carrier to Noise | C/N | ≥45 | dB | |
| Carrier suppression | - | ≥58 | dB | |
| Phase noise | - | @10KHz≤-80dBc/Hz,@100KHz≤-100dBc/Hz | ||
Process
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