The ONS 15454 DS3-12 card provides 12 Telcordia-compliant, GR-499 DS-3 ports per card. Each port operates at 44.736 Mbps over a single 75 ohm 728A or equivalent coaxial span. The DS3-12 card operates as a working or protect card in 1: 1 protection schemes and as a working card in 1: N protection schemes. The DS3-12 card supports 1: 1 protection with the proper backplane EIA. EIAs are available with BNC or SMB connectors.