The service transmission rate on the long path cannot reach 100 Mbit/s. In the long path, the delay of an NE does not exceed 20 us (equivalent to four credits over an 8 km distance), which can be ignored.
The FC service is connection-oriented and it needs to wait for response. Therefore, the rate decrease is more significant when the delay is much longer, as shown in the following figure:
In addition, the test result depends on how the tester tests the rate. If the user tests the transmission rate by simulating the transmission with software, the rate can reach 100 Mbit/s by setting related parameters (block size, I/O parallel traffic). If the user performs the test by copying data of the server and disk array, the rate cannot reach 100 Mbit/s.