one day, x operator report that they use ethernet tester to test an EPL service between OSN3500 and OSN500 and set MAC inloop, they just get 10M bandwith when
bind 2 VC3
OSN3500 220.127.116.11 N2EFS4
OSN 500 5.62.02.12 EFT8
Ask customer to change the test method, use tester to loop or create two EPL service to use lan cable to loop, the bandwith is ok
Because the chip of EFT8 has limition
1,Because OSN500 use SD579 and BCM5248 chip to realize ethernet service transimit function.
2,When BCM5248 chip has not finished negotiation, such as not connct lan cable, lan cable is cut off, or the SMI path which connect PHY and MAC chip, it will work
at 10M mode defaultly
3,The working mode of SD579 chip will select the value of PHY chip.
4,when SD579 set MAC in-loop, software will cut off SMI path, this time PHY chip will work at 10M, so MAC will work at 10M.
Customer test using MAC inloop, the chip will work at 10M mode defaultly, so customer can only get 10M bandwidth.
The EFT8 board of OSN500 has limition, so don't use MAC in-loop to test the bandwith