Which of the following GPON protection networking modes is commonly used by enterprises?

typeB

Type B provides protection for the OLT, OLT PON ports, and backbone fiber.

xPON type B applies to single-homing or dual-homing scenarios.

Figure 1 shows a single-homed xPON type B protection network. Type B single-homing protection mainly protects the OLT PON port and backbone fibers. When the OLT PON port or the backbone fiber is faulty, services can be automatically switched to another OLT PON port or the backbone fiber.

Figure 1 Single-homed xPON type B protection network

Networking Scenario	Advantage	Disadvantage	Usage Scenario
Single homing	Networking, OLT/ONU management, and service provisioning are simple.	An OLT fault will interrupt services. In addition, two optical fibers routed in one pipe may both be broken.	Protects important services, such as the enterprise private line service and the base station private line service.

Figure 2 shows a dual-homed xPON type B protection network. Type B dual-homing protection mainly protects the OLT, OLT PON port, and backbone fibers. When the OLT, OLT PON port, or backbone fiber is faulty, services can be automatically switched to another OLT, OLT PON port, or backbone fiber.

Figure 2 Dual-homed xPON type B protection network