The ONS 15454 DS1-14 card provides 14 Telcordia-compliant GR-499 DS-1 ports. Each port operates
at 1.544 Mbps over a 100-ohm twisted-pair copper cable. The DS1N-14 card supports the same features as the DS1-14 card but can also provide 1:N (N<5) protection.
The DS1/E1-56 card provides 56 Telcordia-compliant, GR-499 DS-1 ports per card, or 56 E1 ports per
card. Each port operates at 1.544 Mbps (DS-1) or 2.048 Mbps (E1). The DS1/E1-56 card operates as a working or protect card in 1:N protection schemes, where N<=2.