5.3.1.6.7.
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 20% (TBD-006 ) for PSRFITS
-
1 link (100GbE) as per I.S1M.SADT_SDP.005 with maximum link occupancy
of 80%
The maximum allowed pulsar timing 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.
21: Maximum Allowed