So when the cutover happens, does that mean expanded capacity on NJICS by integrating the 800mhz frequencies?
A number of 800 MHz frequencies have already been migrated from the SmartZone system to the ASTRO 25 system. For example, from the SZ North cell, the new Passaic cell got 856.4625, 856.9625, and 857.4625 while the Pluckemin ASR got 851.5625 and 852.2375. So right there are 5 of the original 12 channels of the SZ North cell reallocated to the NJICS.
It's unlikely that the SmartZone sites will exist as they currently do once that system is shut down. The IR sites of that system are already being shut down, and you're not going to see three large simulcast cells on the NJICS going forward. Instead more 800 MHz frequencies will likely be doled out to specific cells and sites to increase capacity, however also keep in mind that the NJICS is TDMA capable, and so once the SZ system is shut down, all of the talkgroups that currently operate in FDMA mode like the NJSP will operate more efficiently when they can start using TDMA.
Btw the SmartZone sites are not part of the NJICS core, however they are visible to the core via the SmartX site converters, which is why sites 10, 11, and 12 do not exist on the NJICS...those Site IDs already exist on the SZ system, and so they are left vacant on the ASTRO 25 system. Once the SZ system is shut down, those Site IDs can be used on NJICS if they want to create them on that zone controller.