Thanks a lot Biser.
Further testing on this I found that I can turn ON and OFF the modem run time. ttyUSB* nodes are getting created once I turn ON the modem. Only issue is Modem should be turned ON during the boot up before USB driver are loaded (by the time ACM_probe is called I guess). Why is that so?
Also I am still looking for help on including PPPD to my file system. As I mentioned I am using release 7.
Thanks,
Srinivas