Top row, from left to right:
CCM1 4 frequency control UHF Base. CCM2 4 Frequency Control VHF Base. DCCM3 Display Channel Control Module VHF 1 Channel. DCCM4 Display Channel Control Module Repeater with MDC ID decode, emergency decode, etc. DCCM 5&6 are unassigned (obviously).
Bottom row, left to right:
Phone patch control, alert tones/marker/multiselect control, Radio Control Module, radio patch controls/paging, and MDC/DCCM controls.
Select/Unselect audio comes out of the two speakers at the very top of the unit.
This is a Series II+ Compact OP. It's the "second generation" of these, as it supports II+ features (Stat Alert/DCCM's & Trunking), whereas a Series II Compact OP does not support these features.
Enjoy!
