Service Guide

LTE Standard Module Series
EG91_Series_Hardware_Design
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3.14. Network Status Indication
The module provides one network indication pin: NETLIGHT. The pin is used to drive a network status
indication LED.
The following tables describe the pin definition and logic level changes of NETLIGHT in different network
status.
Table 15: Pin Definition of Network Status Indicator
Table 16: Working State of Network Status Indicator
A reference circuit is shown in the following figure.
Figure 26: Reference Circuit of Network Status Indication
Pin Name Pin No. I/O Description Comment
NETLIGHT 21 DO Indicate the module’s network activity status 1.8 V power domain
Pin Name Logic Level Changes Network Status
NETLIGHT
Flicker slowly (200 ms High/1800 ms Low) Network searching
Flicker slowly (1800 ms High/200 ms Low) Idle
Flicker quickly (125 ms High/125 ms Low) Data transfer is ongoing
Always High Voice calling