GC-100
From LinuxMCE
The Baudrate for devices that are connected to a GlobalCache GC-100 need to be set via the web admin interface of the GC-100 itself. Setting the baudrate using the -b parameter in testserial or elsewhere has no effect.
If GC-100 is not working, check if you have socat processes gone wild
ps ax|grep 'socat.*ttyS_150'
Kill all of them, and try again.