MX2800 M13 multiplexer, creating a product that meets the most stringent carrier class requirements. The MX2800 offers bandwidth consolidation at a low price and in the smallest footprint available in the industry. The MX2800 houses two hot-swappable controller cards that are capable of combining independent T1s, E1s, or T1s and E1s, on the same DS3. The two controller cards also provide built-in 1:1 redundancy for the DS1 and DS3 signals as well as redundant DS3 connections.