On Thu, Dec 30, 2010 at 02:47:59PM +0530, vandana salve wrote: > At a time only one modem is configured successfully. This works with > either of the modem but not with both modems at same time Perhaps the modems are interfering with each other. Test as follows: With one modem connected to internet, use AT commands on the second modem to reset it (ATZ), query signal strength (AT+CSQ), registration with network (AT+CGATT?), and scan for networks (AT+COPS). Repeat the tests with both modems disconnected from the internet. Compare the results. Ensure good electrical and physical separation of: - the modem power supplies, - the modem RF stages, - the modem antenna systems. Repeat the tests after change of separation. To automate testing, here is one method, using chat included with pppd package: # cat << EOF > test.chatscript REPORT +CGATT: REPORT +CSQ: '' AT OK-AT-OK AT+CGATT? OK-AT-OK AT+CSQ OK-AT-OK '' EOF # chat -f test.chatscript -t3 -r test.results < /dev/ttyUSB0 > /dev/ttyUSB0 -- James Cameron http://quozl.linux.org.au/ -- To unsubscribe from this list: send the line "unsubscribe linux-ppp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
