The 45 is older, but better than the newer 48. The next 3 cards OCUxxx are for the analog phone lines. The right most card is the power supply. This converts the 130 V coming in on the 19 gauge pairs that were run with the fiber into battery, ringing voltage, and the voltages required for the circuits. 130 Volts is really high to be run on low voltage wiring.
Bottom card is some sort of diagnostic card.
This shows the bottom card. The F connector at the very bottom is routed to the cable TV tap on the rear. The cover has seals to keep out moisture. There's no cooling in this inner cabinet. That's a lot of electronics in an outdoor environment.