TECHNICAL
The Harmonic Pebble R-PHY device is already equipped with a switch for daisy chaining to other nodes so these ethernet ports can be used for this solution. Note that the link between MSO head-end and node may be upgraded to two wavelengths if bandwidth requirements are within the existing Lambda bandwidth capabilities. Figure 8 shows how this solution looks with real hardware from Harmonic (cOS Pebble R-PHY with Fin OLT Plug). These are controlled by Intel-powered servers at the MSO head-end. From this practical example we can see how DOCSIS and PON access technologies can co-exist and complement each other, providing the additional traffic bandwidth benefits of PON as well as extending the longevity of existing cable network infrastructure. Another very important part of a unified solution for PON and DOCSIS is the integration to the provisioning system and back-office. DOCSIS Provisioning of X (DPoX) enables operators to use their existing Cable Modem provisioning system to also provision ONUs (XSG or 10GEPON). That also enables a unified IP addressing management across the PON and DOCSIS network. A Unified DOCSIS and PON Solution That Enables Business Agility The Distributed Access Architecture allows the MSO to seamlessly expand their access networks beyond DOCSIS. The Fin OLT plug allows Harmonic’s Pebble R-PHY nodes to also become PON OLTs, all managed under a single cOS platform powered by Intel ® Xeon ® processors. Brownfield areas that were previously out of reach to PON networks can now be easily served out of an existing node while reusing trunk fibre. Greenfield deployments also benefit from a faster time to market due to the use of a common platform for DOCSIS and PON, which minimises training and back office integration. Going forward, disaggregation will also allow additional unification of access technologies, like Ethernet and Wireless managed under a common cloud solution.
Figure 6. Unified DOCSIS - PON Overview
Figure 7. DOCSIS to PON offload using Harmonic cOS R-PHY and Fin OLT Plug
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Figure 8. Uniform Provisioning for DOCSIS and PON (DPoX)
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Volume 46 No.1 March 2024
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