Paging Facility
The paging facility enables people to be accessed, who are beyond hearing distance of the ring signals from their own telephone, from telephones, PBX operator consoles or external lines.
A person who is assigned the paging facility is informed of an incoming call in that his/her portable, individual radio receiver (staff locator) is activated (selective paging) or his personal code is signaled acoustically/visually via lamp displays erected at various places in the building (universal paging).
When the sought person (the pagee) is reached by the call he can answer from the nearest extension in the PBX and gain speech connection with the person who has requested paging (the pager).
Addressing a Pagee
The person or group of persons the pager wishes to reach are paged on the basis of the directory numbers in the PBX.
- A person with assigned extension number is paged with this extension number. Note that the number range is 2-5 digit numbers, i.e. 6-10 digit extension number cannot be paged.
- A person lacking own extension telephone, e.g. visitor, is paged via an extra directory number used for paging purposes. Note that the range of the extra directory numbers is 2-5 digits.
- A group of persons, who the pager wishes to access at the same time, are paged via a common directory number used for paging purposes.
The directory number can be affiliated to an arbitrary paging code. The paging code is the address of the radio receiver for selective paging or a lamp code for visual paging, See Figure 2.
A paging job is initiated from A (pager)
Peripheral paging equipment is seized
Code is transmitted to B-party's (pagee's) receiver
B-party answers with procedure via telephone C
Speech connection A-C
Equipment for Paging
The PBX undertakes a paging job in cooperation with peripheral paging equipment. For radio paging the peripheral equipment comprises radio transmitter with control part and a number of paging receivers. For visual paging the peripheral equipment embraces the lamp displays and their control equipment. The PBX is interconnected with the peripheral paging equipment via an interface, see Figure 1.
Initiation of Paging
A paging job is initiated with a procedure plus wanted directory number or automatically by the PBX as diversion. The paging job is stored in the PBX, the wanted number is converted into paging code and seizure of the peripheral paging equipment is undertaken. Codes is transmitted via radio or lamp displays, See Figure 2.
Paging can be initiated from all extension telephones and PBX operator consoles in the PBX.
Normally it is possible to initiate only one paging mission at the same time to one particular extension or extra or common paging number. However, with a Market Dependent Parameter (MDP) it is also possible to allow several pagings at the same time to the same object. This function is called queuing to paging.The function is not used with speech paging, neither in an isolated LIM.
Answer to Paging
In principle an answer to paging is executed as a meet me function. From an arbitrary extension the pagee dials an answer procedure whereafter normal speech connection to the pager is established. At the same time the paging job is disconnected and the peripheral equipment is released for other calls latest during this phase, see Figure 2.
Answers to paging jobs can be initiated from all extension telephones and PBX operator consoles in the PBX.
In the event that the pagee has obtained the A-number of the pager by automatic number transmission he can answer by calling the pager's A-number.
If queuing to paging is allowed and there are several paging missions activated to the same object (extension, extra or common paging number) they will be answered so that the oldest one is answered first, then the second oldest and so on.
Types of Paging
Following types of paging can be used in the PBX. Most radio paging systems on the market deal with all main types.
- Simple paging via meet me answer.
The paging receiver whistles or vibrates on activation.
Answer is undertaken via a procedure whereafter speech connection is established between pager and pagee.
- Paging by voice via radio. Oneway or bothway speech connection is established from the PBX via radio to the receiver, that is activated. Answer by a procedure (meet me) is also possible.
- Paging with automatic transmission of digit information (A-number) to a display in the receiver. Answers to internal calls are achieved by the pagee calling the received A- number. Answers to external and extended calls are undertaken via a procedure (meet me). The calling party number (A-number) can have the range 2-10 digits.