Huawei H902MPLA OLT Board H902MPLA control board is the most important part of OLT. They provide uplinks, configuration and control. They contain the complete OLT configuration. It also has 4 GE/10GE ports for uplinks and CON, ETH, ESC and USB ports for monitoring and maintenance. No SFP modules included. Uninterrupted operation OLT usually has 2 H902MPLA control cards for uninterrupted operation. During normal operation, one control board is active and the other is in standby mode. In case of problems with the motherboard, the backup board takes over this role. Because when we set OLT, we need to save the configuration and data.