Why are Fiber Switch ports used for cascading?

        Why are Fiber Switch ports used for cascading?Since fiber ports are still very expensive, fiber is primarily used for connections between core and backbone switches, or for cascades between backbone switches.It should be noted that fiber ports are not stackable and can only be used for cascading.

        Fiber Switch has two ports, one for each Fiber.Of course, the fiber optic jumper must also be 2, otherwise there will be no communication between the ports.When a switch is cascaded through an optical fiber port, the transceiver at both ends of the optical fiber jumper must be switched. When one end is connected to "receive", the other end is connected to "send".

        Similarly, when one end is sent, the other end is received.If both ends of the fiber jumper are connected to "receive" or "send", the LED indicator on the port does not light, indicating that the connection fails.Only when the optical fiber port is connected successfully, the LED indicator will turn green.Similarly, when a backbone switch is connected to a core switch, the fiber optic transceiver ports must be cross-connected.

        Fiber jumpers are divided into single-mode fiber and multi-mode fiber.

        The Fiber Switch port and jumper must be the same type of Fiber used in the general cabling. In other words, if the multimode Fiber is used in the general cabling, the Switch's Fiber interface must follow the 1000base-sx standard, and the multimode Fiber jumper must also be used.If a single-mode fiber is used for integrated cabling, the switch's fiber interface must be implemented to the 1000base-lx /LH standard, and single-mode fiber jumpers must be used.