Куда копать? После 15-20 сек прерывается связь, /dev/ttyUSB0 меняется на /dev/ttyUSB1
pra6407-1708light2, модем от мегафон
Internet dialer version 1.61
--> Initializing modem.
--> Sending: ATX3
ATX3
OK
--> Sending: AT+CGDCONT=1,"IP","internet"
AT+CGDCONT=1,"IP","internet"
OK
--> Modem initialized.
--> Sending: ATDT*99#
--> Waiting for carrier.
ATDT*99#
CONNECT 150000000
--> Carrier detected. Starting PPP immediately.
--> Starting pppd at Sat Nov 11 14:44:44 2017
--> Pid of pppd: 14405
--> Using interface ppp0
--> Disconnecting at Sat Nov 11 14:45:15 2017
--> The PPP daemon has died: A modem hung up the phone (exit code = 16)
--> man pppd explains pppd error codes in more detail.
--> Try again and look into /var/log/messages and the wvdial and pppd man pages for more information.
--> Auto Reconnect will be attempted in 5 seconds
--> Initializing modem.
--> Sending: ATX3
--> Sending: ATQ0
--> Re-Sending: ATX3
--> Modem not responding.
--> Initializing modem.
--> Sending: ATX3
--> Sending: ATQ0
--> Re-Sending: ATX3
--> Modem not responding.
--> Disconnecting at Sat Nov 11 14:45:37 2017