Spectrum Master™ MS271xE User Guide : LAN and DHCP : LAN Connection
 
LAN Connection
The RJ‑45 connector is used to connect the instrument to a local area network. Integrated into this connector are two LEDs. The amber LED shows the presence of a 10 Mbit/s LAN connection when on, and a 100 Mbit/s LAN connection when off. The green LED flashes to show that LAN traffic is present.