Hi all,
Been googling for about an week but found no solutions. I am able to connect to ISP provider after which about 12kb transfers down then activity ceases. The connection then shuts down after about 2 min. The following are some of my outputs:

# uname -r
2.6.17-1.2145_FC5smp

# cat /proc/bus/usb/devices
T: Bus=01 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 2 Spd=12 MxCh= 0
D: Ver= 1.01 Cls=02(comm.) Sub=00 Prot=00 MxPS=16 #Cfgs= 1
P: Vendor=16d8 ProdID=5531 Rev= 0.00
S: Manufacturer=CMOTECH CO., LTD.
S: Product=CMOTECH CDMA Technologies
S: SerialNumber=Serial Number
C:* #Ifs= 2 Cfg#= 1 Atr=e0 MxPwr=100mA
I: If#= 0 Alt= 0 #EPs= 1 Cls=02(comm.) Sub=02 Prot=01 Driver=cdc_acm
E: Ad=81(I) Atr=03(Int.) MxPS= 16 Ivl=32ms
I: If#= 1 Alt= 0 #EPs= 2 Cls=0a(data ) Sub=00 Prot=00 Driver=cdc_acm
E: Ad=8a(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms
E: Ad=0b(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms


# tail -f /var/log/messages
Jul 9 23:18:34 localhost ifup-ppp: pppd started for ISP on /dev/ttyACM0 at 460800
Jul 9 23:18:34 localhost pppd[4767]: pppd 2.4.3 started by xxx, uid 0
Jul 9 23:18:35 localhost wvdial[4768]: WvDial: Internet dialer version 1.54.0
Jul 9 23:18:35 localhost wvdial[4768]: Initializing modem.
Jul 9 23:18:36 localhost wvdial[4768]: Sending: ATZ
Jul 9 23:18:36 localhost wvdial[4768]: ATZ
Jul 9 23:18:36 localhost wvdial[4768]: OK
Jul 9 23:18:36 localhost wvdial[4768]: Sending: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Jul 9 23:18:36 localhost wvdial[4768]: ATQ0 V1 E1 S0=0 &C1 &D2 +FCLASS=0
Jul 9 23:18:36 localhost wvdial[4768]: OK
Jul 9 23:18:36 localhost wvdial[4768]: Sending: ATM0
Jul 9 23:18:36 localhost wvdial[4768]: ATM0
Jul 9 23:18:36 localhost wvdial[4768]: OK
Jul 9 23:18:36 localhost wvdial[4768]: Modem initialized.
Jul 9 23:18:36 localhost wvdial[4768]: Sending: ATDP#777
Jul 9 23:18:36 localhost wvdial[4768]: Waiting for carrier.
Jul 9 23:18:36 localhost wvdial[4768]: ATDP#777
Jul 9 23:18:36 localhost wvdial[4768]: CONNECT
Jul 9 23:18:36 localhost wvdial[4768]: Carrier detected. Chatmode finished.
Jul 9 23:18:36 localhost pppd[4767]: Serial connection established.
Jul 9 23:18:36 localhost pppd[4767]: Using interface ppp0
Jul 9 23:18:36 localhost pppd[4767]: Connect: ppp0 <--> /dev/ttyACM0
Jul 9 23:18:42 localhost pppd[4767]: CHAP authentication succeeded
Jul 9 23:18:42 localhost pppd[4767]: local IP address 201.238.127.73
Jul 9 23:18:42 localhost pppd[4767]: remote IP address 192.168.171.96
Jul 9 23:18:42 localhost pppd[4767]: primary DNS address 196.3.132.1
Jul 9 23:18:42 localhost pppd[4767]: secondary DNS address 196.3.132.4
Jul 9 23:18:42 localhost pppd[4767]: Deflate (12) compression enabled
Jul 9 23:20:43 localhost gconfd (root-3467): GConf server is not in use, shutting down.
Jul 9 23:20:43 localhost gconfd (root-3467): Exiting


Need help to make connection active. Please make it simple. Many thanks!!!!!