Why USB modem is not working ?

Solution Verified - Updated -

Issue

  • USB modem directly connected to an IBM X3650M3 but no /dev/ttyUSB0 created or power led lights are up for the given device in concern.

Environment

  • Red Hat Enterprise Linux 5.8.

  • Machine : IBMX3650M3

  • MultiTech MT9234ZBA-USB MultiTech Systems Multimodem ZBA

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