t1 slotFramed E1 T1 with no. of Time Slots greater than or equal 4 -> Payload = 2 x no. of time slots. Unframed T1, C11 –> Payload = 48 (2 x 24 (all slots)). Unframed E1, C12 –> Payload = 6410GbE bandwidth and M.2 SSD cache, all at once E10M20-T1 helps you boost IO performance and network bandwidth simultaneously using just one PCIe expansion slot on your NAS. 10GbE ready Achieve Multi-G