Thanks for that guys:
So we have... in no specific order, two ports for the optical laser range finder (LRF) for transmitting and receiving the laser, a laser emitting port for laser beam riding missiles (LTM or laser target marker), a television port... presumably for the operator to use in combination with a set of cross hairs and auto tracking software to find and lock targets, a thermal channel for "bearing finder" for SAMs is a goniometer port that tracks the actual position in the field of view of launched missiles so their deviation from the target can be calculated by the guidance system and the needed course corrections for the missile can be transmitted to the missile to get it on target.
(note the goniometer is for command guided missiles only as beam riding missiles work out where they are in the laser beam and manoeuvre themselves onto the point of aim.)
The main thermal channel would be used like the TV channel in adverse weather conditions, at night, or to see through some types of camouflage or some types of smoke or even light vegetation.
LRF = 2 ports
LTM = 1 port
DTV = 1 port
Goniometer = 1 port
Thermal Imager = 1 port
The goniometer and thermal imager ports don't need optically transparent lenses so they can look gold coloured or even white or black because not only do they not need to be transparent to visible light it is often better if they aren't as it prevents distractions.
The digital TV sight will often have a telescopic lens that is not that large, thermal imager often have a large surface area in comparison.
So taking all this and looking at the new EO system based on looking at the system for the Palma system the laser emitter is a small port while the laser receiver is larger. The biggest is the thermal port... so my guess would be this:
The main thing I am not totally sure of is whether the DTV and LTM are around the right way.
The larger port I have marked for the DTV could be a very large aperture laser that is used for target marking for semi active laser homing weapons (ie a laser spot is projected on to the target and weapons from the ship or other platforms can use that to guide on to) or a much less powerful beam for laser beam riders like SOSNA-R.
If we look at the advertisement photo on the site above for the EO system it is shown mounted on one side of the mast near the funnel suggesting there would be another positioned on the other side to give a complete field of view coverage. If both can mark targets and can be used to identify objects in the water or in the air then they greatly increase the ships potential to protect itself.
For instance on a ship with a 57mm gun mount and a Pantsir-S1 turret or two these optic turrets could mark incoming anti ship missile from a higher angle, seeing targets further out and clear of sea spray for guided 57mm cannon shells, so with the 57mm gun pumping out shells at 120 rounds per minute and with at least two optical EO systems on the mast together with the 4-5 targets per minute the Pantsir-S1 can engage with missiles and guns... plus with the accuracy of a laser range finder a small ship can have a formidible close in defence capacity even ignoring any medium SAMs it might have.
A Goniometer can measure deviation between the line of sight and an IR emitting object... which is normally a missile. It could easily be the cannon shells from a Duet turret with IR tracer elements in their tail, so it could assist in that engagement too.