DS3i-N-12
The DS3i-N-12 card provides 12 ITU-T G.703, ITU-T G.704, and Telcordia GR-499-CORE compliant DS-3 ports per card. Each port operates at 44.736 Mbps over a 75-ohm coaxial cable (with the FMEC-E3/DS3 card). The DS3i-N-12 can operate as the protect card in a 1:N (N <= 4) DS-3 protection group. It has circuitry that allows it to protect up to four working DS3i-N-12 cards. In a 1:N protection group the DS3i-N-12 card must reside in either the Slot 3 or 15.