PA Control Shelf

                                                                        PA Backplane Assembly - M57-900-018

                                                                        Controller Assembly - M57-900-016

                                                                                          Zone Switch Card - M57-900-008

                                                                        600 Ohm Line Interface Card - M57-900-007

                                                                        70V Line Interface Card - M57-900-009

                                                                        RedPhone Line Interface Card - M57-919-001

                                                                        4 Wire E & M Card - M57-922-002

                                                                        Test Level Monitor Card - M57-935-001

                                                                        IP Controller Card - M57-936-001

                                                                        C.O. Line Interface Card - M57-927-001