Last nights shut down had the added complication of being the first requiring the LACC ops room to be closed and operations to be conducted from the Training suites in an adjacent room. The telephone problems earlier in the afternoon were caused by overly keen engineers configuring the training room to accept us well in advance of the move but not appreciating the consequences. Shouldn't happen again. The LACC ops room needs to be shutdown at least once a month, as opposed to NAS shutdowns that occur once or twice a week. I would expect either type of planned shutdown to impact on LACCs ability to handle traffic, until all the watches (engineering and ATC) are happy with the process. Unplanned shutdowns don't bear thinking about.