This MIB is intended for devices powered by external power sources, in particular Power Over Ethernet (PoE or formerly called inline power), to provide power usage configuration and information for NMS. For example, PoE supplies DC power over standard Category 5 unshielded twisted-pair (UTP) cable. Instead of requiring wall power, powered devices such as IP telephones can utilize power provided from power source equipments. By using Cisco Discovery Protocol (CDP), powered devices can negotiated with power source equipment to obtain optimum power supply. GLOSSARY Midspan Injector The midspan PSE sends out a signal tone down one of the unused pairs of the standard Category 5 cable and detects tone on the other unused pair when the PD loops this tone back to it through a loopback transformer. Once the midspan PSE detects this tone, it begins to provide power down the cable using the unused pairs. The midspan PSE provide no physical layer capability. Powered Device ( PD ) These are devices powered by external electrical power sources. They are, for example, IP telephones and wireless Access Points or bridges. Power Source Equipment ( PSE ) These are devices supplying electrical power to other equipments. They are, for example, inline power switches and power patch panels.

MIB content (14 objects)


Cisco Systems Inc.
Contact info
Cisco Systems, Customer Service Postal: 170 West Tasman Drive San Jose, CA 95134 USA Tel: +1 800 553-NETS E-mail:


2004-05-05 00:00
Initial version of this MIB module.