One channel at each of the simulcasting sites transmits the same signal simultaneously at the same frequency
One channel at each of the participating sites transmits the same signal simultaneously at different...Read more
How do you size your system for the “big one”?
This is another case where precise analysis goes beyond the scope of this guide, but we can offer some helpful guidelines for major events. The guidelines are appropriate for planned events...Read more
System size is also a consideration when defining backhaul. While all modern P25 networks are IP based, each vendor has its own calculations to determine the capacity of the links connecting your network sites. A simple (and preliminary) rule of...Read more
At this point you should consider some high-level failure scenarios and determine how much resilience you need to build into the design. Some common approaches are:
Back-up power source/s – generators and batteries.
Overprovision of sites so...Read more
The range of needs and solutions, both technical and non-technical, is vast, and likely to increase with statewide networks and mutual aid agreements. Your first priority is to define the scope of your interoperability:
Which outside entities does...Read more
The P25 Inter RF Sub-system Interface (ISSI) provides IP-based open standard system-level interoperability. Using the ISSI you can interconnect two or more P25-compliant trunked systems – even if they are from different vendors or operating in...Read more
Dispatch is the point where radio and other technologies merge. It is essential to involve dispatch management and personnel in preparing requirements for the new system.
What is the total number of dispatch positions?
Will all of them be in the...Read more
System and user equipment functionality is determined in your Needs Analysis. However, you need to understand the implications of your choice of features and functions.
P25 systems and devices may have three different levels of features and...Read more
There are several traps when considering mandatory features, standard options and vendor proprietary options.
First, the desire to include too many features may result in prohibitive price tag. In organizations that are conscious of budgetary...Read more
The data capabilities inherent in the P25 standard have been largely surpassed by commercial broadband developments and FirstNet expectations. However, there are some useful applications which operators should consider.
Plan for the future of P25...Read more