See
Middlesex County. The RWJ ALS units are paged on JEMS 1 (155.220/103.5) and talk with the dispatch center, MedCentral, on EMS 5. The "County EMS Coordination" repeater is often used for special events or incidents.
JEMS 2, 155.340, is used by ambulances to call hospital ERs and let them know about patients they're bringing in. The RWJ ER uses a PL of 103.5 on this channel but in general this channel isn't used much any more. There is a little typo in the description field of RWJ JEMS-2, I'll submit the correction.
Jim