This is an IP178GH 5 port 10/100 switch. Though as shipped this is a dumb switch I've put together some basic code which allows you to configure the switch for port mirroring, VLANs etc. A reasonably comprehensive datasheet is available.
I have a blog post which describes how you can interface with this switch here.
I also now have a version of this switch which comes with a in a static port mirroring configuration.