INTRODUCTION 1.1 ESULS4-L1-B INTRODUCTION ESULS4-L1-B is an unmanaged PoE/PoE+ Industrial Ethernet switch with 5*10/100M auto sensing electrical ports. Four of five ports support PoE/PoE+. Each PoE port outputs up to 30W. Industrial level 3 protection design and IP40 enclosure protection makes the product suitable for applications in harsh environments.