Systematic inspection for SDH digital microwave communication equipment systems is implemented following standards including YD/T 2529-2013. A full set of performance parameters including rise time, fall time, return loss, average transmitted optical power, receiver sensitivity, wavelength, extinction ratio, eye diagram and pulse width are inspected comprehensively. By simulating real-world communication scenarios, the transmission stability and anti-interference capability of the system are verified to sustain normal operation of microwave communication networks and satisfy industry technical specifications for digital microwave transmission systems.
Inspection Items
Rise time, fall time, return loss, average transmitted optical power, receiver sensitivity, wavelength, extinction ratio, eye diagram, pulse width, input bit rate tolerance, input jitter tolerance, output jitter, output pulse amplitude
Inspection Standards
1. YD/T 2529-2013 Technical Requirements and Test Methods for SDH Digital Microwave Communication Equipment and Systems
2. YD/T 2529-2013 Technical Requirements and Test Methods for SDH Digital Microwave Communication Equipment and Systems, Clause 5.8.2.2
3. ITU-T G.707/Y.1322:2016 Network node interface for the synchronous digital hierarchy (SDH)
4. ITU-T G.783:2016 Characteristics of synchronous digital hierarchy (SDH) equipment functional blocks
Inspection Equipment
Microwave communication analyzer, optical power meter, optical spectrum analyzer, eye pattern tester, pulse width tester, return loss tester, signal analyzer
Key Indicators and Inspection Requirements
1. Optical power: deviation ≤±0.5dBm
2. Receiver sensitivity: ≤-28dBm (BER=1×10⁻¹²)
3. Bit error ratio: ≤1×10⁻¹²
4. Jitter: input ≥0.1UI, output ≤0.05UI
5. Protection switching time: ≤50ms
6. Alarm function: accurate reporting without missing or false alarms
Inspection Methods and Implementation Points
1. Inspection is conducted in compliance with YD/T 1097-2018
2. Optical power test: operating wavelength is measured with an optical power meter
3. Bit error ratio test: a 24‑hour continuous run is performed via an SDH analyzer
4. Jitter test: measurement is completed using a jitter analyzer
5. Protection switching test: switching duration is recorded under simulated fault scenarios
6. Alarm verification: alarm reporting logic is checked through fault simulation
Precautions
1. Testing starts only when the equipment has no active fault alarms
2. Optical interfaces need cleaning before connection
3. All testing instruments must stay within valid calibration cycles
4. Testing should be arranged outside business peak hours
5. Complete service configuration backup prior to inspection
6. Keep test cable connections tight and stable
Note: All information above is for reference only. For further details and customized inspection solutions, please contact us at any time.
