Costumer has complained to the speed between two NE40 which is connected with each other over optical GE interface. Costumer has tested this phenomenon by connecting one PC in BTC NE40 and other PC to BHQ NE40. He gets some file by FTP protocol from other site and in this case speed was only 8Mbps.
I have enable auto negotiation on interface and after that speed is up to 70Mbps. So this is normal.
I have display working mode of interface in NE40. It was 100Mbps and full duplex. Also if you using UDP protocol for testing, than they are no problem. Only TCP protocol has this problem. I have analyzed the problem and find that auto negotiation was disabling by customer on Ethernet interface of NE40 which is connected to testing PC.
99% of PC can work on auto negotiation mode without any problem. So better to use auto negotiation mode for connecting the PC.