code: public Configuration getConfiguration(final KNXNetworkLink bufferedLink)
  	{
  		synchronized (configs) {
  			for (final Iterator<ConfigImpl> i = configs.iterator(); i.hasNext();) {
  				final ConfigImpl lc = i.next();
  				if (lc.getBufferedLink() == bufferedLink)
  					return lc;
  			}
  		}
  		return null;
  	}
docs: Gets the configuration which provides the buffered link.
  <p>
  If the network link is not a buffered link or not found in the current
  configurations of this network buffer, <code>null</code> is returned.
  
  @param bufferedLink the buffered link to get the configuration for
  @return the owning configuration of that link or <code>null</code>