4 Circuit Design
Copyright © Fibocom Wireless Inc.
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Table 43. Working status of the network status indicator
Mode
Level Status of Network Indicator Pin
Description
1
600 ms at high level or 600 ms at low level
No SIM card
SIM pin
Registering with the network
(T < 15s)
Failed to register with the
network
2
3000 ms at high level or 75 ms at low level
Standby
3
75 ms at high level or 75 ms at low level
Established a data connection
4
Low level
Voice call
5
High level
Sleep status
The following figure shows the reference circuit of network status indicator.
Figure 23. Reference circuit for the network status indicator