![]() Battery will be red if battery is drained or if the battery otherwise needs replacement.The alarm LED will flash yellow if temporarily muted or be a solid yellow if muted indefinitely.The DC light will be green if the unit is not getting AC power and is using standby power instead.The system status light will be green if the unit is getting AC power.The LEDs and buttons from top to bottom are as follows: Our 8 hour option is the PS18L by Powertec Solutions Incorporated (PSI).Īn alarm will beep if the battery runs low. They both come with a one year warranty described in detail here 8 Hour Option Users who would like to purchase a power supply after installation will want to call in and we will schedule a dispatch to install the power supply. We have two options available that are offered on the sign up page after an order is placed. Please note that any routers, end user devices, or phones that require additional power and use an AC outlet will need their own power source the battery backups only supply power to the ONT. Sonic provides the option of a battery backup for the ONT to keep it supplied with power in the case of a power outage. If there is no power to the ONT, the end user will not be able to use the Internet or phone. In addition, the ODN is the very path essential to PON data transmission and its quality directly affects the performance, reliability, and scalability of the PON system.Sonic Fusion Fiber works by sending light through our Fiber infrastructure that is then interpreted by the ONT. The drop fiber connects the optical access point to terminals (ONTs), achieving optical fiber drop into user homes. The distribution fiber from the optical distribution point to the optical access point distributes optical fibers for areas alongside it. The feeder fiber starts from the optical distribution frame (ODF) in the central office telecommunications room and ends at the optical distribution point for long-distance coverage. The ODN specifically has five segments which are feeder fiber, optical distribution point, distribution fiber, optical access point, and drop fiber. Within the ODN, fiber optic cables, fiber optic connectors, passive optical splitters, and auxiliary components collaborate with each other. ODN, an integral part of the PON system, provides the optical transmission medium for the physical connection of the ONUs to the OLTs with 20 km or farther reach. But in practice, there is a little difference between ONT and ONU according to their location. Belong to different standard bodies, they both refer to the user side equipment in the GEPON system. ONT is an ITU-T term, whereas ONU is an IEEE term. Actually, ONT is the same as ONU in essence. ONU could be connected by various methods and cable types, like twisted-pair copper wire, coaxial cable, optical fiber, or through Wi-Fi.Įnd-user devices may also be referred to as the optical network terminal (ONT). OLT supports bandwidth allocation that allows making smooth delivery of data float to the OLT, which usually arrives in bursts from the customer. Grooming is the process that optimizes and reorganizes the data stream so it would be delivered more efficiently. Furthermore, ONU can send, aggregate, and groom different types of data coming from the customer and send it upstream to the OLT. In general, there is a distance or other access network between ONU and end user's premises. These electrical signals are then sent to individual subscribers. ONU converts optical signals transmitted via fibers to electrical signals. Optical Network Unit (ONU) / Optical Network Terminal (ONT) The OLT has two float directions: upstream (getting distributing different types of data and voice traffic from users) and downstream (getting data, voice, and video traffic from the metro network or from a long-haul network and send it to all ONT modules on the ODN.) The maximum distance supported for transmitting across the ODN is 20 km. ![]() In these parts, PON card and power supply support hot-swap while another module is built inside. ![]() In general, OLT equipment contains rack, CSM (Control and Switch Module), ELM (EPON Link Module, PON card), redundancy protection -48V DC power supply modules or one 110/220V AC power supply module, and fans. The primary function of the OLT is to convert, frame, and transmit signals for the PON network and to coordinate the optical network terminals multiplexing for the shared upstream transmission. OLT is the starting point for the passive optical network, which is connected to a core switch through Ethernet cables. In addition, the optical distribution network (ODN) is also used during the transmission between OLT and ONU/ONT. ![]() In a Gigabit Ethernet Passive Optical Network (GEPON) system, there are an optical line terminal (OLT) at the service provider's central office and a number of optical network units (ONUs) or optical network terminals (ONTs) near end users, as well as the optical splitter (SPL). ![]()
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