ANSI SCTE 174:2018 pdf free download – Radio Frequency over Glass Fiber-to-the-Home (RFoG) Specification Extension
The Optical Hub may take on many other forms according to the needs of the system. For example, it may comprise only optical amplification and splitting in the downstream direction, with optical combining and demodulation followed by digital conversion in the upstream direction. The form of the optical hub is not controlled by this document. Specifications contained herein apply only between the start of the optical distribution network (ODN) and the RF coax output from the R-ONU. The system designer is responsible for making sure that the effects of any signal degradation at the Optical Hub or upstream of it, are properly accounted in the network design. Upstream system performance will vary by choice of Upstream Optical Receiver hardware. Receiver noise performance and technology choice determines interoperability. The ODN is defined to start at the input to the WDM at the optical hub and to end at the pigtail on the R-ONU at the home. The ODN is shown with a single point splitter. The ODN may also be implemented as a series of optical taps or as a multi-layer splitter, such as a 1:4 split followed by a set of 1:8 splitters at a different location. So long as the maximum distance, loss budget, and split ratio are respected, the architecture of the splitting is at the discretion of the operator.
6.3. Embedded R-ONU
An Embedded R-ONU is an R-ONU that is an integral part of a larger product supplied by the cable operator, and which complies with the intent of this specification so far as practicable given the function of the overall product. In some cases, the completed product will not literally meet one or more specifications in this document as a necessary result of the way the combined product works. However, so long as it can be shown that the completed product will interoperate with other RFoG products and that the completed product meets the intent of this specification, the manufacturer is not precluded from advertising it as conforming to this specification. 6.4. Upstream Wavelength, λ up λ up . One permitted wavelength is 1310 nm nominal, and the other is 1610 nm nominal. Use of 1610 nm permits an optional overlay of an RFoG system with either an IEEE 802.3-2012 (EPON) system or an ITU G.984 / ITU G.987 (GPON) system, both of which use 1310 ±50 nm or lower wavelengths for upstream data communications. Both upstream wavelengths will work with the same physical network. Note that if the 1310 nm upstream wavelength is used for RFoG, then neither EPON nor GPON will coexist in the same physical passive optical network. For compatibility with 10G-EPON or XG-PON systems, the 1610 nm upstream option should be used.