INTRODUCTION 1.1 ESULS4-M1-B INTRODUCTION ESULS4-M1-B is an unmanaged PoE/PoE+ Industrial Ethernet switch with 4*10/100M auto sensing electrical ports and 1 *100M SFP uplink ports. This product supports PoE/PoE+. Each electrical port outputs up to 30W. Industrial level 3 protection design and IP40 enclosure protection makes the product suitable for applications in harsh environments.