1.1. Executive Summary
This document is intended to give cable operators a head start on practices and operational guidelines for transitioning from DOCSIS 3.1 (D3.1) to DOCSIS 4.0 (D4.0), with a focus on optimization of the network in preparation for the extended spectrum ranges for both upstream and downstream transmissions. It explores the unique challenges and adjustments needed for both full duplex (FDX) and frequency division duplex (FDD) variants of D4.0, ensuring operators are well-prepared for the upgrade. This document also discusses the implications of new customer premises equipment (CPE) features introduced with D4.0, emphasizing their impact on network performance and interference management.
1.2. Scope
This operational practice covers tests, measurements, and overall processes by which cable operators can ensure their HFC networks are optimized for the rollout of D4.0 technology. While extending the DOCSIS spectrum is a result of moving from D3.1 to D4.0, spectrum extension alone is not covered.
This document will address both FDX and FDD variants of D4.0 technology. In many cases, the readiness work will be similar but may require some additional specification. Likewise, the tools required will be largely similar, with some obvious adjustments needed for the specific use case.
Coexistence of D4.0 and Multimedia over Coax Alliance (MoCA) is assumed not to occur. Cohabitation will create conflict if operators move towards ultra-high-split.
Finally, the proactive network maintenance (PNM) technologies referred to in this document are typically those that are currently available with D3.1 customer premises equipment (CPE). New D4.0 PNM features and measurements will occasionally be mentioned, but detailed procedures for using them will be handled by the CableLabs PNM-WG and NOS WG7 in the future.
1.3. Benefits
- This document outlines the best practices and recommendations for cable operators who are in the planning and execution stages of the upgrade to D4.0.
- Additionally, it outlines the potential challenges and specific implementation concerns in both the FDX and FDD variants.
- Lastly, this document explains and details the complex topic of CPE Interference in the context of new or increasingly important sources of interference brought on by the upgrade to D4.0.
1.4. Intended Audience
- This document is intended for cable operators, vendors, and other interested parties in the cable and DOCSIS technology domains.