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Apollo Command Module (Block II) Up-Data Link (UDL) equipment manufactured by Motorola, measuring approximately 9″ x 17.5″ x 6.5″, marked on the body: "C28-1A103." The unit features connectors “J1” through “J5” on top, and another, “J6,” on the side. The lower panel exhibits adhesive residue from removal of the part identification plate.
The up-data link consists of detecting and decoding circuitry, a buffer storage unit, output relay drivers, and a power supply, and provides the means for the ground to update the computer and the central timing equipment of the spacecraft. The device could receive, verify, and distribute digital updating information sent from the Manned Space Flight Network at various times throughout the mission.
