Hongdian H7921/H7920 Basic 3G/4G Router - Manual (Page 124)

7 FAQ H792x 3G/4G Router
7 -90 (2014-05-28)
Solution
 Connect suitable antenna
 Modem cannot online, check SIM and modem setting
 Modem offline, check router setting, like wake up setting, ICMP setting, check if there are
any setting make router offline
7.4.4 Cannot find SIM/UIM card
Phenomenon
H792x 3G/4G Router cannot find SIM/UIM card
Possible Reason
 SIM card damage
 SIM bad contact
Solution
 Replace SIM card
 Re-install SIM card
7.4.5 Poor Signal
Phenomenon
H792x 3G/4G Router no signal or poor signal
Possible Reason
 Antenna connect wrong
 Area signal weak
Solution
 Check the antenna and re-connect it.
 Contact Telecom Operator to confirm signal problem
 Change to high-gain antenna
7.4.6 Compress Protocol not match
Phenomenon
H792x 3G/4G Router dial failure, log shows compress protocol not match
Possible Reason
Modem compress protocol do not match with server end
Solution
Change compress protocol setting