Overview Product Description 5821-10 - 56k DSU/CSU RS232/V.35 External (Refurbished) 90 Day Warranty Product Videos Custom Field Product Reviews Write a Review Write a Review × IBM 5821-10 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *