P25 is a standard for the manufacturing of interoperable digital two-way wireless communications products. Sometimes also known as Project 25 or APCO P25, this is a user-driven standard, it is not industry – or Federal government – driven standard.
P25 allows for improved communications within and between agencies – especially emergency service providers. Such intra- and inter-operability is necessary for coordinating efficient and timely responses in our post-911 world.
What are some of the hallmarks of P25 technology?
More choices and affordability
With a standard in place, government agencies can now choose from multiple vendors and products when selecting their communications equipment, ultimately saving money and gaining the freedom to select from the widest range of features.
Minimal training is required for P25 operation.
Digital and analog
P25 radios can communicate in analog mode with other legacy radios and they can communicate with other P25 radios in analog or digital mode.
P25 may be used in "talk around" mode without any intervening equipment between two radios, in conventional mode where two radios communicate through a repeater or base station without trunking or in a trunked mode. (Trunking means signals are automatically assigned to a channel by a repeater or base station.) Icom's latest P25 radio models offer all three communication types in one package.
Improved radio spectrum efficiency
P25 networks will have enough capacity to handle calls and allow room for growth, even in areas where the spectrum is crowded and it's difficult for agencies to obtain licenses for additional radio frequencies.
Codan Automated Link Management (CALM) is a new and very advanced feature in which the transceiver performs the channel selection operation automatically. The handset in most ways looks and operates like a mobile phone.