System Operational Requirements of Plant Paging System
1 Master Station Operation
1.1 Master stations shall be capable of calling any other station in the system by touch dialing an extension number. When the calling party dials the extension, the digits and called party directory name shall display on the LCD display of the station and immediate communication shall be established with the idle called station. At the called party station, the number and directory name of the calling party shall display.
After connecting, hands free communication may begin and both parties may converse naturally without pressing any buttons. Calls may be canceled by either party by pressing a button or going on-hook. Incompletely dialed calls shall time-out automatically in five seconds.
1.2 Master stations shall be capable of being preset to any of four modes of privacy for receiving calls. Stations in Automatic Loudspeaking Answer and Manual Answer mode both shall receive a pre-announce tone and shall automatically connect when called; a Manual Answer station microphone shall be muted until answered. Stations in Full Privacy Ring mode shall receive a ring tone. Stations in Do-NotDisturb mode shall appear busy to the calling station.
1.3 The volume for both voice and ring signal shall be adjusted by means of digital volume keys on the station keypad. The keypad volume keys shall independently control the volume for both handset and hands free operation.
1.4 It shall be possible to remotely control relays on sub-stations where ancillary devices such as door releases, bells, lights or CCTV cameras may be activated by connecting to the station and dialing a single digit.
1.5 A handset with coil cord shall be provided for private conversations on indicated stations. When the handset is lifted off-hook the panel speaker and microphone shall be disconnected and handset shall be enabled. Calls from handsets shall be full duplex. It shall be possible to use the keypad with the handset on or off-hook.
1.6 A handset with stainless steel armored cord shall be provided for private conversations for stations in hazardous locations. When the handset is in use, its associated external speaker shall become muted and the handset shall be enabled. Calls from handsets shall be full duplex. It shall be possible to use the keypad with the handset on or off-hook. All hazardous location handsets shall have an integral ultra-bright LED light source indicating incoming call, off-hook, or emergency page. Additionally, an integral relay closure will activate during incoming call and priority
page conditions.
2 Sub-Station Operation
2.1 Each sub-station call button shall place calls to a pre-programmed destination and have the capability to be programmed to place two types of calls, Standard and Admin. It shall be possible to program any number of sub-stations to call the same master station.
2 Sub-station buttons programmed as Standard shall place calls to master stations or substations and shall be processed in the same manner as a call from a master station.
3 Sub-station buttons programmed as Admin shall place calls to Administrative master stations where they shall be stored allowing multiple sub-stations to place simultaneous calls to the same master without receiving a busy signal or being lost. Sub-station buttons set as Admin shall be capable of being programmed to place either Routine or Emergency level calls with selectable Locking or Non-locking status. Admin calls shall be capable of being assigned any of ten programmable text messages and shall be capable of reporting to multiple master stations.
3 Administrative Master Station Operation
3.1 Administrative Master stations shall place and receive calls and shall have all the same features as a conventional master station as well as a dedicated Tone Silence button.
3.2 In addition to the basic master keypad, the Administrative Master station shall have additional keys, which shall be capable of being programmed to provide one-touch selection of standard functions.
3.3 Administrative Master stations shall have the capability to store multiple simultaneous Admin sub-station calls. It shall be possible to display and answer Admin calls out of sequence without using numeric touchpad or without losing calls. It shall be possible to display up to ten levels of substation call priority. LCD display shall provide an active call count display of up to ten stored calls. If more calls are waiting to be answered, an LED shall illuminate. Multiple master stations shall be capable of receiving Admin calls from the same sub-station. Master stations shall
be capable of operating in a parallel or independent mode or receive Admin calls from all substations.
3.4 LED indicators on administrative master stations shall be provided to indicate Admin call status of Routine and Emergency levels and More Calls. The LED indicator located on the hazardous and explosion proof stations shall indicate, off-hook, incoming call, and emergency page.
3.5 The Program Distribution Interface station shall be accessed from a master station by dialing a code corresponding to the interface. It shall be possible to access multiple Program Interfaces from any master station. Calling to a station connected to a program source shall cause the program source to be put on Hold and restored at the end of the conversation.
3.6 The Overhead Page Interface station shall be accessed from a master station by dialing an access code corresponding to the interface. It shall be possible to access multiple Page Interfaces from any master station. It shall be possible to set a time limit for Overhead pages.
3.7 The Radio Pocket Page Interface station shall be accessed from a master station by dialing an access code. It shall be possible to transmit, in either the manual or automatic modes of operation, the calling station extension and directory name to be displayed on an alphanumeric display pager or groups of pagers.
3.8 The Two-way Radio Interface shall be accessed from a master station by dialing an access code and allow manual two-way conversation.
3.9 The PBX Telephone Interface shall be accessed from a master station by dialing an access code for outgoing calls. The exchange shall seize the first available line in a preassigned hunt group. Incoming calls may be directed to a specific extension or allowed to dial any extension.