这份文件 a） 解决了安全超低电压（SELV）和有限电源（LPS）应用的支持问题，这些应用通过以下方式提供远程电源: •符合ISO/IEC 11801系列标准参考实施的4对平衡布线，每根导体的电流高达500 mA1对平衡布线，每根导体的电流高达1000 mA； 目标是支持通过平衡布线向终端设备提供远程电源的应用程序。购买本文件时提供的所有当前修订版均包含在购买本文件中。

This document a) addresses the support of safety extra low voltage (SELV) and limited power source (LPS) applications that provide remote power over: • 4-pair balanced cabling in accordance with the reference implementations of ISO/IEC 11801 series standards using currents per conductor of up to 500 mA;• 1-pair balanced cabling using currents per conductor of up to 1 000 mA; and targets the support of applications that provide remote power over balanced cabling to terminal equipmentAll current amendments available at time of purchase are included with the purchase of this document.