5.2.1.6.3.
Maximum supported data rate
The maximum data rates calculated here is based on the following
parameters (as specified for this interface):
-
MTU of 9000 bytes
-
Layer 1 and Layer 2 (ethernet) overheads of 38 bytes
-
Layer 3 and Layer 4 (IPv4 and TCP) overheads of 20 bytes each,
therefore 40 bytes
-
Layer 5 (FTP) overheads of 3 bytes (header and byte count for each
block of data)
-
File format overheads of 100% for HDF5 and 20% (TBD-006 )
for PSRFITS (csv overhead included in the size of the candidate list)
-
8 links (100GbE) as per I.S1M.SADT_SDP.004 with maximum link
occupancy of 80%
The maximum allowed pulsar search and single pulse output data
rate summed over all simultaneous scheduling blocks11Reference
is made here to simultaneous scheduling blocks instead of subarrays
since SKA1-SYS_REQ-3026 constrains the total number of simultaneous
scheduling blocks. Subarrays that are not allocated a scheduling block
(like a maintenance subarray) do not produce data and therefore should
not constrain the data rate. is shown in the table below. Refer to
the [RD7] for the detailed calculations.
14: Maximum Allowed Pulsar