Overview Product Description Paradyne 3611-B4-022 64 kbps DSU/CSU, w/4WSW56M, 6-Port TDM (Refurbished) 90 Day Warranty Product Videos Custom Field Product Reviews Write a Review Write a Review × 3611-B4-022 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *