1. Design Principles​

• Achieve comprehensive monitoring across all regions, multiple stages, and diverse functions in digital TV broadcasting.
• Enable quality monitoring, content monitoring, security monitoring, and service monitoring for digital TV broadcasts.
• Implement monitoring for centralized digital TV systems based on TS over IP switching and transmission technologies.
• Establish a hybrid monitoring model combining real-time monitoring of critical program signals with periodic monitoring of other program signals.

​2. System Monitoring Stages​

​Source Signal Monitoring:
As the source of digital TV signals, the quality and characteristics of the source directly determine the system’s overall quality and security. Real-time online monitoring is essential for satellite reception signals and encoder signals. Multi-screen real-time viewing and transcoding/storage are applied to satellite-received programs and encoder outputs.

​Bitstream Core Processing Monitoring:
Focuses on MPEG/TS core processing. Real-time bitstream content analysis ensures continuous monitoring of image quality after core processing.

​QAM Modulation Output Monitoring:
As the final stage of the digital TV headend system, signal quality at this stage directly impacts user viewing experiences. Real-time monitoring of broadcast bitstream content is implemented.

​3. Monitoring System Architecture​

For most modern digital TV headend platforms, this solution prioritizes monitoring at the QAM Modulation Output stage. If feasible, multi-layered, multi-screen monitoring can be extended to source signals (satellite reception/encoding) and bitstream multiplexing points.

Professional monitoring equipment analyzes processed bitstreams. Uniform processing is applied to different signal types, converting device alarms into SNMP protocols while transforming monitored bitstreams into TS over IP signals. The system also supports demodulation of modulated signals.

Using the ​DMM-1900P, ASI and QAM signals can be converted into IP signals for bitstream monitoring and program viewing.

4. Monitoring System Functions​

① ​Embedded LINUX Operating System: Ensures system security and stability.
② ​Bitstream-Level Quality Monitoring: Detects issues such as frozen frames, black frames, audio loss, and mono audio.
③ ​Stream Polling Monitoring: Supports cyclic monitoring of bitstreams.
④ ​Alarm Strategy Configuration: Alarms can be configured based on occurrence frequency.
⑤ ​Multi-Layer Polling Monitoring: Supports RF signal polling, ASI interface signal polling, and IP multicast stream polling.
⑥ ​Service-, PID-, Time-, and Tolerance-Based Alarm Policies: Customizable strategies for alarms, including service/PID association, time windows, and tolerance thresholds.
⑦ ​Local Alarm Storage: Stores alarm data locally for 12 months, with query capabilities by time, type, and severity.
⑧ ​Measurement Log Storage: Records bandwidth, PCR values, packet jitter, etc., at 1-second intervals for 2 months. Data can be exported as graphs or Excel files.
⑨ ​Custom Monitoring Plans: Users can define and schedule different monitoring strategies for specific time periods.
⑩ ​Custom Alarm Policies: Configure tolerance time, PID filtering, alarm severity, and thresholds for alarm frequency.
⑪ ​Alarm Recovery Notifications: Alerts users when alarms are resolved.
⑫ ​Multi-Channel Alarm Delivery: Supports GUI alerts, pop-up windows, SNMP traps, audible alarms, relays, COM port triggers, stream capture, and remote/local window pop-ups.
⑬ ​Real-Time Transcoding & Forwarding: Streams monitored content via TS over IP for remote viewing/listening.
⑭ ​Remote Access Protocols:

• ​VNC: Free remote desktop client for configuration, deep stream analysis, and system maintenance.
• ​HTML/IE Access: Enables data queries, stream downloads, system upgrades, remote recording, offline analysis, and I-frame-based program backhaul (minimum 56 Kbps bandwidth).
  ⑮ ​NTP Network Clock Synchronization: Ensures time accuracy across the system.
  ⑯ ​Open Protocol Support: Allows secondary development via exposed underlying protocols.
  ⑰ ​Stream Forwarding & Filtering: Supports TS over IP forwarding with PID-based program filtering.