Service reliability enhancement for enterprise users and mobile users becomes a focus of carriers on passive optical network (PON) networks. G.984.1 (approved in 2008) defines four dual PON protection configurations, among which type B and type C are feasible. Compared with type C, type B requires a lower cost but the implementation is more difficult. Type B provides redundancy for OLT's PON ports and backbone fiber. When a fault occurs on the OLT's PON port or backbone fiber, services can be switched to the functional optical fiber.
Figure 1 shows a GPON type B protection network. The protection covers the active and standby PON ports on the OLT, and the active and standby optical fibers.
If the working port is functional and the protection port can receive upstream optical signals, the protection port can detect a fault and handle it if the optical fiber connected to the working port is broken or no upstream optical signals are received because the working port malfunctions.
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