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 fiber to electrical signals. That signal can serve up to 128 ONTs at a range of up to 12.5 miles by using Optical Splitters. It can transmit a data signal to users at 1490nm wavelength. The main functionality of the OLT is to adapt the incoming traffic (voice/data/video) from the metropolitan rings into the PON transport layer. The OLT contains a central processing unit, a gateway router, voice gateway uplink cards and passive optical network cards. OLT (Optical Line Terminal) is the endpoint hardware device located at the central office in a Passive Optical Network (PON). In recent years, Fiber to the Home (FTTH) is rapidly developing support technologies. The TOLT, ONU and ONT are now widely used in fiber network access in city. It can help efficiently reduce network construction cost, while simultaneously providing a guarantee on high bandwidth and high integration.
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