This Article Applies to All GPON OL T Products and all Omada Switches with optical ports. They have the following demands in this example. Each GEM port is identified by a unique ID called port ID. The GEM ports encapsulate the Ethernet services into GEM frames, add. The OLT is installed at the headend and each OLT port connected into the fiber to the designated service area and the splitters installed to serve the intended users. Prepare a minimum of one ONT or ONU device for testing. Gather information about your. high 19 inch rack mount. It is a high c the standard 19” rack. Demission of machine frame: 442 mm (Length) x 315 mm network management port.