Digi TransPort WR31 User Manual page 86

Hardware
8 SIGNAL LEDs: Indicate strength of cellular signal.
3 LEDs: Excellent
•
2 LEDs: Good
•
1 LED: Fair
•
0 LEDs: Poor or No signal
•
9 SIM / R-UIM sockets (SIM card models only): SIM 1 and SIM 2 are for use with the Subscriber
Identification Module(s) (SIMs) or Removable User Identification Module(s) (R-UIMs).
Digi TransPort WR Routers User Guide
TransPort WR44 RR hardware
86