WHAT IS PUBLIC ACCESS MOBILE RADIO?
Companies which require the use of commercial two way business radio (for example to communicate with delivery or sales staff) have a choice whether to provide their own communications in-house or to purchase the facility from a service provider. Within a local area, service for a number of customers may be provided from a transmitter at a single site (typically up to 45 km from the site) which is called a Common Base Station (CBS), details of which are separately available in information sheet RA 307. Where a number of transmitters are linked together to form a regional or national network, the service is known as Public Access Mobile Radio (PAMR). One feature of PAMR is that it uses a facility called trunking where a number of channels are linked in such a way that a mobile using the network will be able to choose the next available free channel, rather than wait for a particular channel to become free. This reduces call waiting time and also improves the efficiency with which the ra
