From VoIP phones to wireless LAN access points, many of today’s network devices receive their power over the Ethernet through twisted-pair data cables. Lack of power to a device has therefore become a network problem rather than a facilities problem. Network tools now need the visibility to detect power issues that may cause a device to fail. LinkRunner Pro and Duo support standard 802.3af methodology to detect voltage level by cable pair – whether from a switch or a mid-span device.