What it is
The R88ACRGB010CRE is a 10 m encoder cable listed as suitable for G Servo Motors, the accessory class that carries the feedback signal between the servo amplifier and the motor-mounted encoder.
Where this class of cable lands
Servo motor encoder cables in this class run the incremental or absolute position feedback from the motor back to the drive; the 10 m length is the headline spec because it sets how far the motor can sit from the panel before the feedback budget starts to erode.
Sourcing close
For a current production accessory, the right move is to quote it to order against an RFQ so the BOM line locks in at the same revision the panel is being built to.