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Need Help in identify a few jacks on the Master II UHF repeater.

looking at the rear of the Master II there is the bus bar it is labeled
and to the left of it is a series of Jacks labeled
J1201, J1202, J1203, J1204 . To the left of them is 3 more Jacks, the
first two i have no idea as to what they are used for need help with
these.. i do know that the bottom of the 3 jack is use for the far left
Aux. slot which i have installed is a meter for rx/tx tuning metering,
The first two are unknown.