Tata Indicom USB Modem on Linux

cat /etc/wvdial.conf:

[Dialer Defaults]
Init1 = ATZ
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Modem Type = USB Modem
Baud = 460800
New PPPD = yes
Modem = /dev/ttyACM0
ISDN = 0
Stupid mode = 1
Phone = #777
Password = internet
Username = internet

Don’t understand above. Um ok but I am too lazy to explain.