### Instruction:

Extract the cause and effect entities from the following sentence:
R-2.3.9-3: All S/C shall be capable to receive and acknowledge commands from the ground at all times when communication links can be established

### Assistant:

NOT_RELEVANT: R-2.3.9-3:
VARIABLE: communication links
CONDITION: can be established
AND: and
EFFECT_1: All S/C shall be capable to receive
KEYWORD: when
EFFECT_2: acknowledge commands from the ground at all times
CAUSE_1: communication links can be established

