Overview Product Description MT56DSUR-R - 19.2K-56K Sync/Async DSU/CSU Rackmount (Refurbished) 90 Day Warranty Product Videos Custom Field Product Reviews Write a Review Write a Review × Multi-Tech MT56DSUR Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *