QCVN on electromagnetic compatibility of cable network for distribution of television
Circular No. 14/2021/TT-BTTTT promulgating “National Technical Regulation on Electromagnetic Compatibility (EMC) of Cable Network for Distribution of Television, Sound and Interactive Services” is issued on October 29, 2021 by the Ministry of Information and Communications.
This Regulations specifies requirements for electromagnetic interference radiation of cable networks used to transmit video, audio and interactive services in the band from 0.15 MHz to 3.5 GHz in Vietnam. The application of this Regulation is to ensure that cable networks may operate simultaneously with radio services such as: safety, broadcasting, aeronautical mobile, aeronautical radio navigation and land mobile (including cellular networks) and other services specified in the National Radio Frequency Spectrum Plan without interference.
Besides, to assess the leakage radiation level of digital, broadband signal using the subcarrier method, an unmodulated sine wave carrier signal can be used interspersed between the broadband, digital signals. This subcarrier is set up so that the signal level measured with a measurement bandwidth of 200 Hz matches the measured value of the previously measured digital, broadband signal.
Cable television service providers shall ensure that the cable network that distributes television signals conforms to the Regulation during the design, installation, operation and maintenance process; and coordinate with related parties in the process of resolving interference from the cable network that affects the operation of other networks and services.
This Circular takes effect from July 1, 2022.