cara instal modem E1550 lewat konsol, syarat :
1. wvdial sudah terinstal
#yum -y install wvdial
#wvdialconf /etc/wvdial.conf
#wvdial
# vi /etc/wdial.conf
[Dialer Defaults]
Init2 = ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Modem Type = Analog Modem
; Phone = *99#
ISDN = 0
; Username = Axis
Init1 = ATZ
; Password = 123456
Modem = /dev/ttyUSB0
Baud = 9600
#vi /etc/resolv.conf
nameserver 4.4.2.1
selesai deh... restart pc , kalau ngga langsung konek .. jalankan perintah #wvdial
pakai GUI lebih mudah

selamat mencoba