Hello everyone,
Today, I will continue to write about the PON system overview. Now, I will write about the control and service boards for OLT.
OLT has different boards. The main boards are control and service boards. Except for these boards, OLT has a power board, universal board and upstream interface board. We can see these boards in the next table.
Figure 1. Different boards for OLT
The main element of OLT is control boards. We can access, configure and manage OLT via the control board (CON, ETH and ESC ports). In addition, there are 4 slots for SFPs (GE/10GE ports) on the control boards, which provide a connection between the OLT and the device (router or switch) from the core network. There are two types of control boards – MPLB and MPLA(E) for MA/EA 5800-X17, MA/EA 5800-X15, and MA/EA 5800-X7. Figure 1. shows MPLB and MPLA(E) control boards. For OLT MA/EA 5800, the control board is MPSA.
Every OLT has, usually, two control boards – one board is the main and the other is the standby control board. The main control board is active. We access, configure and manage the main control board, it is the active board. When a problem occurs with the active control board, its role is taken over by the standby control board.
Figure 2. Control boards – MPLA and MPLB
There are different service boards, it depends on the standard. There is a service board for GPON, EPON, XG-PON, XGS-PON, P2P, etc. In the next figure, we can see GPON service boards and their features – GPHF and GPSF. These GPON service boards have 16 slots for optical SFP ports – B+, C+ or C++ optical modules. These service boards support a maximum split ratio of 128.
Figure 3. GPON service boards
Except for these boards, there are combo and flex PON boards, which support different standards. Combo PON board supports GPON, XG-PON, and XGS-PON. The examples for these service boards are H902CSHF and H902CGHF. Flex PON board supports GPON, XG-PON, XGS-PON, GPON+XG-PON combo and GPON+XGS-PON. And examples of these service boards are H903FLHF and H902FLHF.
For more information about control and service boards >>
I will continue to write about this topic in the next article >> PON system overview (5): ONU.
Thank you!
