![]() ![]() For PON, TDMA is used to recombine the multiple upstream feeds at the coupler. TDMA enables multiple transmitters to be connected to one receiver. It filters and discards packets meant for other ONTs. The ONT accepts packets assigned to its TDM channel (frame time slot). ![]() PON uses two such technologies: TDM for downstream traffic and time-division multiple access (TDMA) for upstream traffic.Īs a passive device, the splitter acts as distribution point, with the single feed of downstream data broadcast to all connected ONT endpoints. Time-division multiplexing (TDM) allows multiple end devices to transmit and receive independent signals across a single fiber by reserving time slots in a stream of data. The 1550-nm wavelength is reserved for optional overlay services, typically RF (analog) video.įuture iterations of the PON standard will define separate wavelengths for backward compatibility. Wavelength-division multiplexing (WDM) allows bidirectional traffic across a single fiber by using a different wavelength for each direction of traffic: the 1490-nanometer (nm) wavelength for downstream traffic and the 1310-nm wavelength for upstream traffic. ![]() To achieve this, PON takes advantage of two distinct types of long-established telephony multiplexing concepts: wavelength division and time division. Because PON uses the same strand of fiber to send and receive data, the passive optical splitter also acts as an optical combiner receiving data traffic from the same connected end devices. ![]()
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