This is approaching the minimal acceptable speed. On a erratic connection, I have seen my speed drop to 90 kbps for a brief time - the buffer was able to keep up as long as the signal optimized to a higher speed relatively quickly.
If you have a friend with a SlingBox, you could ask him to manually reduce the download speed to 230 kbps within the SlingPlayer software. It would allow you to see what the results might look at.
Another issue that you might face is that whether the 230 kbps is the speed from the Internet to the corporate network, or whether the speed is throttled per internal machine. If it is per machine, you might be okay. If it is a limit placed on all communications with the outside world, then you might find that once you start processing the SlingBox stream, you will see reduced speeds as you share the connection with others.
Finally, be aware that there have reports of individuals nearly losing (or losing) their jobs when they started receiving the SlingBox stream. Unless your corporate IT supplies a large pipe to the Internet, the SlingBox/SlingPlayer can consume a great deal of network resources.
Floyd


RSS