diff -u usb.cpp.orig usb.cpp
--- usb.cpp.orig	2007-11-10 05:19:31.000000000 +0900
+++ usb.cpp	2008-03-17 01:58:48.000000000 +0900
@@ -45,11 +45,18 @@
 #include <time.h>
 #include <unistd.h>
 #include <signal.h>
+#include <errno.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <net/if.h>
+#include <netinet/in.h>
 
 #include <qlayout.h>
 
+#define	MAXWAITDEV		10 /* sec */
+#define	MAXWAITPPP		20 /* sec */
+
 Dialup::Dialup( QWidget* parent ) :
     DialupBase(parent,0,TRUE)
 {
@@ -246,9 +253,97 @@
     return FALSE;
 }
 
+static bool waitdev( const char *dev )
+{
+    struct stat st;
+    int i;
+
+    for (i = 0; i < MAXWAITDEV; i++) {
+	if (stat(dev, &st) >= 0) return TRUE;
+	if (errno != ENOENT) break;
+	sleep(1);
+    }
+
+    return FALSE;
+}
+
+static int findppp( const char *iface, int s )
+{
+    struct ifreq *ifr;
+    struct ifconf ifc;
+    char *cp, *buf;
+    int len, total;
+
+    len = sizeof(*ifr);
+    total = 0;
+    buf = (char *)malloc(len);
+    if (!buf) return -1;
+
+    for (;;) {
+	ifc.ifc_buf = buf;
+	ifc.ifc_len = len;
+	if (ioctl(s, SIOCGIFCONF, &ifc) >= 0) {
+	    total = ifc.ifc_len;
+	    if (total < len) break;
+	}
+	else if (errno != EINVAL || total > 0) {
+	    free(buf);
+	    return -1;
+	}
+
+	len *= 2;
+	cp = (char *)realloc(buf, len);
+	if (!cp) {
+	    if (buf) free(buf);
+	    return -1;
+	}
+	buf = cp;
+    }
+
+    cp = buf;
+    while (cp < &(buf[total])) {
+	ifr = (struct ifreq *)cp;
+	if (ifr -> ifr_addr.sa_family == AF_INET) {
+	    if (!strcmp(iface, ifr -> ifr_name)) {
+		free(buf);
+		return 1;
+	    }
+	}
+	cp += sizeof(ifr -> ifr_name);
+#ifdef	AF_INET6
+	if (ifr -> ifr_addr.sa_family == AF_INET6)
+	    cp += sizeof(struct sockaddr_in6);
+	else
+#endif
+	cp += sizeof(struct sockaddr);
+    }
+    free(buf);
+
+    return 0;
+}
+
+static int waitppp( const char *iface )
+{
+    int i, n, s;
+
+    s = socket(AF_INET, SOCK_DGRAM, 0);
+    if (s < 0) return -1;
+
+    n = 0;
+    for (i = 0; i < MAXWAITPPP; i++) {
+	n = findppp(iface, s);
+	if (n) break;
+	sleep(1);
+    }
+    close(s);
+
+    return n;
+}
+
 static QString dev( const QString& ct )
 {
 // ----NetIndex ADD ST ----
+    if (waitdev("/dev/ttyJACM0"))
 	return QString( "ttyJACM0" );
 // ----NetIndex ADD ED ----
 // ----NetIndex DEL ST ----
@@ -273,7 +368,7 @@
 //	    fclose(f);
 //	}
 //  }
-//  return QString::null;
+    return QString::null;
 // ----NetIndex DEL ED ----
 }
 
@@ -448,6 +543,7 @@
     cfg.setGroup("Properties");
     int dialmode = cfg.readNumEntry("dialmode",0);
     (void)new PppMon(dialmode==2);
+    if (waitppp("ppp0") <= 0) return FALSE;
     return TRUE;
 }