Balance-353AFirmware 7.0.0 build 3310
was port 1 is connected to a 1 gb connectionthe port is configure 1 gbps full duplex
the max speed I have is 128 mbps
A Balance 30 is rated at 150Mbps max throughput (in ideal conditions).
If you want to be able to use 1Gbps of throughput you'd need to consider a Balance 305 or above.