What is the maximum length of UTP cable for voice (POTS) according to structured cabling standards?

The maximum length for unshielded twisted pair (UTP) cable used for voice communications, commonly referred to as Plain Old Telephone Service (POTS), is established to maintain signal quality and performance. According to structured cabling standards, the maximum length of UTP for these applications is 800 meters. This ensures that the twisted pair cabling can effectively transmit voice signals without significant loss or degradation in quality.

This standard takes into account factors such as attenuation and interference over longer distances, which could negatively impact the clarity and reliability of voice calls. The 800-meter specification is a cap set to ensure that installations adhere to the best practices for maintaining optimal performance in POTS applications, thus facilitating clear communication over telephone networks.