DS1-28/DS3-EC1-3 and DS1-84/DS3-EC1-3

(ONS 15310-MA only) The DS1-28/DS3-EC1-3 card has 28 DS-1 ports and 3 DS-3/EC-1 ports. The DS1-84/DS3-EC1-3 card has 84 DS1 ports and 3 DS-3/EC-1 ports.