A form of controlled interface that provides the ability to manually and/or automatically access and/or transfer information between different security domains.
						                            Source(s):
						                            
								                            
                                                                    NIST SP 800-37 Rev. 1
										                             under Cross Domain Solution 
									                            
                                                                    NIST SP 800-53 Rev. 4
										                             under Cross Domain Solution 
                                                                    from
                                                                            CNSSI 4009