Why are advanced tests necessary for VDV circuits with acceptable voice transmission?

Advanced tests are essential for VDV (Voice, Data, Video) circuits with acceptable voice transmission because issues that may not significantly impact voice quality can still adversely affect data transmission. While voice calls often have a certain level of tolerance for minor delays or interruptions, data transmission is more sensitive to these problems. For instance, a circuit may provide clear and understandable voice communication, which relies on constant streaming of audio packets. However, the underlying network may still have latency, jitter, or packet loss that could disrupt data services heavily, such as file transfers or video streaming.

Therefore, conducting advanced tests allows technicians to identify these latent issues that could compromise data integrity even when voice quality appears acceptable. This proactive approach ensures that the entire network functions optimally, supporting both voice and data needs effectively, rather than assuming that a good voice transmission indicates an equally robust data service.