Overview Product Description 49154 - 3512 - 64 kbps DSU/CSU 4-Port M/P mux External (Refurbished) 90 Day Warranty Product Videos Custom Field Product Reviews Write a Review Write a Review × Codex 49154 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *