Key feattures : The Cisco MGX-XM60 Switching Module has the following primary features: Single-height card 60-Gbps nonblocking crosspoint switch fabric Dynamic sharing of capacity across multiple Cisco XM-60s, allowing for N + 1 redundancy Four installed in each Cisco MGX 8950 for 240-Gbps total capacity, 180-Gbps redundant capacity Hot card insertion/removal Complete separation from control processor, allowing data forwarding in the event of control card failure