Regulations on Frequency Signal Ports by Analog Voice for EMC Measurement

22:00, 10/07/2024

Circular 28/2017/TT-BTTTT was enacted by the Ministry of Information and Communications, stipulating the National Technical Regulation on Electromagnetic Compatibility for Fixed Radio Transmission Equipment and Auxiliary Equipment.

According to Circular 28/2017/TT-BTTTT, the quality of the equipment must be verified for analog voice frequency signal ports through the following methods:

- By measuring signal spikes on the signal port during continuous exposure in both signal path directions from analog to digital and from digital to analog;- By functional testing of the main signal port and other signal ports after exposure;- By confirming that errors in software and data stored in memory have not occurred.

Additionally, Circular 28/2017/TT-BTTTT also stipulates quality criteria for each phenomenon, specifically:

- For continuous phenomenon- Noise signal levels obtained from the EUT measured at 600 Ω impedance must not exceed -40 dBm.- For spike phenomenon- The EUT must automatically return to normal operating status after the exposure measurement stops.

More details can be found in Circular 28/2017/TT-BTTTT which takes effect from July 1, 2018.

- Thanh Lam -

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