In modern communication networks—from 4G and 5G to future 6G—mobile base stations form the backbone of wireless connectivity. Telecom and wireless networks typically operate on -48 VDC power, but why? The short story is that -48 VDC, also known as a positive-ground system, was selected because it provides enough power to support a telecom signal but is safer for the human body while doing telecom activities (such as. The choice of -48V DC for powering telecommunications equipment is a standard practice rooted in a blend of historical precedent and a suite of technical benefits that ensure the robust, efficient, and safe operation of telecommunications networks. For many outside the. Today it is generally accepted by safety regulations and electrical code that anything operating at or below 50V DC is a safe low-voltage circuit, and -48VDC is still the standard in communications facilities serving up both wired and wireless services. In fact, -48VDC allows telecom operators to. DC delivers stable power without conversion, cutting faults and eliminating energy loss/maintenance issues from AC multi-stage setups. Why not use 24V, 36V, or other DC voltages? Balancing transmission loss and safety: Lower voltages (e., 24V) increase current for the same power (P=UI), leading. A -48V DC power system supplies direct current at minus forty-eight volts to telecom equipment.
