As the newest step in the continuing evolution towards an all-digital headend, Distributed Access Architecture (DAA) extends the digital portion of the headend/hub domain out to the fiber optic node and places the digital/RF interface at the optical/coax boundary. This strategic move offers many potential benefits, including increased bandwidth capacity, improved fiber efficiencies (wavelengths and distance), simplified plant operations with digital optics, decreased loads on facility space and power systems, and directional alignment with NFV/SDN/FTTx systems of the future.
ARRIS provides both the CCAP Core and Remote PHY Device (RPD) defined in the CableLabs® Modular Headend Architecture (MHAv2). In this approach, the PHY layer is moved from the CCAP into a node or remote shelf, but the MAC processing, provisioning, and monitoring functions remain in the headend.
The E6000® CCAP Core runs on the Gen 2 E6000 hardware platform (E6000 Chassis, RSM-2, DCAM-2, and UCAM-2). The RPDs are add-in modules for existing ARRIS nodes. ARRIS supports three RPD form factors: E6000n RPD for the OM6000 Fiber Deep node, E6000n RPD for the NC4000 and NC2000 nodes, and E6000n RPD for Remote PHY Shelf.
Generating RF signals in the fiber optic node rather than in the headend can provide a cost-effective tool for:
Improving plant signal quality
Improving fiber utilization and reach
Improving service group density in the headend
Reducing space and power consumption in the headend
Simplifying plant maintenance by using digital optics
Reducing transmission costs by leveraging data center economies of scale for Ethernet switches and optics
Applications for DAA include:
Plant upgrade for DOCSIS 3.1 support
Enabling Fiber Deep deployment without requiring headend expansion
Utilizing DWDM optics for long distance links
Supporting data services in small hubs
Simplifying logistics for changing US/DS split or top-end frequencies
Remote PHY is a key component in Arris’s Distributed Access Architecture (DAA) portfolio, which can provide significant operational benefits—including increased bandwidth capacity, improved fiberefficiencies (wavelengths and distance), simplified plant operations with digital optics, and decreased loads on facility space and power systems.
The Arris Remote PHY Shelf enables MSOs to deploy digital fiber closer to end subscribers while making the change easier for existing HFC networks, alleviating the need to modify fiber nodes as it works with nodes from any vendor.
An E6000r™ Remote PHY Shelf is a 19” rack mount unit which can host up to three E6000n Remote PHY Devices (RPDs). RPDs work in conjunction with the CCAP Core to extend the PHY layer from the CCAP further into the network, closer to the customer. MAC processing, provisioning, and monitoring functions remain in the headend. The RPD provides full spectrum support for digital broadcast TV, VoD, and DOCSIS 3.0 and DOCSIS 3.1, as well as strategic alignment with future NFV/SDN/FTTxsystems.
Arris E6000r R-PHY Shelf Use Cases
Outdoor street cabinets, in non-environmentally-controlled conditions
Smaller hub sites, especially where power is a challenge
Replacement of legacy CMTS infrastructure, overcoming channel limitations and adding DOCSIS® 3.1 capability
In buildings, such as Multi-Dwelling Units (MDUs) and offices, particularly newer ones that have fiberconnectivity