# Calculation method of the SDH lower-order cross-connect capacity

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Calculation method of the SDH lower-order cross-connect capacity:
For example, if the queried VC-12 quantity of lower-order cross-connections is 2016, how do I calculate the lower-order cross-connect capacity?
First, convert the VC-12 quantity to the VC-4 quantity. As one VC-4 contains 63 VC-12s, the VC-4 quantity is 32 (2016/63). Second, calculate the capacity. As the capacity of 64 VC-4s is 10 Gbit/s, the capacity of 32 VC-4s is 5 Gbit/s.

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Capacity of OSN3500 cross connection
GXCSA: high-order capacity:40Gbit/s GXCSA:high-order capacity:5Gbit/s GXCSA: access capacity:35Gbit/s EXCSA: high-order capacity:80Gbit/s EXCSA:high-order capacity:5Gbit/s EXCSA: access capacity:75Gbit/s UXCSA: high-order capacity:80Gbit/s UXCSA:high-order capacity:20Gbit/s UXCSA: access capacity:58.75Gbit/s SXCSA: high-order capacity:200Gbit/s SXCSA:high-order capacity:20Gbit/s SXCSA: access capacity:155Gbit/s SXCSB: high-order capacity:200Gbit/s SXCSB:high-order capacity:20Gbit/s SXCSB: access capacity:156bit/s

Capacity of Optix OSN2500 cross-connection
Q2/Q3CXL serial card : High order capacity:20Gbit/s�?28×128 VC-4�?Low order capacity:20Gbit/s �?28×128 VC-4）or �?84×384 VC-3）or�?064×8064 VC-12�?Sigal subrack access capacity :18.75Gbit/s�?20×120 VC-4�?Q5CXL serial card : High order capacity: new mother board :60Gbit/s�?84×384 VC-4) old mother board�?0Gbit/s�?28×128 VC-4�?Low order capacity:�?0Gbit/s�?28×128 VC-4）or�?84×384 VC-3）or�?064×8064 VC-12�?Sigal subrack access capacity : new mother board :22.5Gbit/s�?44 ×144 VC-4�?old mother board�?8.75Gbit/s�?20×120 VC-4�? Enterprise Network,Enterprise Transmission,MSTP,Capacity of Optix OSN1500 cross-connection,Q2/Q3CXL serial card

Method used to calculate RAID capacity
If the number of RAID member disks is N (excluding hot spare disks), available capacity of RAID 0 = N x disk capacity. Available capacity of RAID 1 = N x Disk capacity/Number of mirror groups Available capacity of RAID 3 = (N-1) x Disk capacity Available capacity of RAID 5 = (N-1) x Disk capacity Available capacity of RAID 6 = (N-2) x Disk capacity Available capacity of RAID 10 = N x Disk capacity/Number of mirror groups Available capacity of RAID 50 = (N-2) x Disk capacity

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