How many ports does a repeater have? Repeater has two ports: one for incoming signal and another one for “boosted” outgoing signal. Hub is able to join more than two signals. If you need to convert Single Mode to Multimode, or extend a Multimode network, Fiber Optic Repeaters are the devices to use. They are the ideal solution to connect. The optical repeater grabs all the signals from optical fiber cable into electronic form. However, there are situations where link loss (attenuation) is too high due to splice, patch panels, number of connectors, or combination of fiber sizes. The GOF Repeater is equipped with the NEW TSB81BA3D, the latest revision of Texas Instruments' 1394b PHY. This manual describes how to install and operate Modicon Fiber Optic Repeaters (Part Numbers 490NRP253, 490NRP254, 490NRP954, NWFR85D200, and NWFR89D200).