ANSI SCTE 232-2016 pdf free download – Key Performance Metrics: Energy Efficiency & Functional Density of CMTS, CCAP, and Time Server Equipment.
8. CCAP Equipment
8.1. CCAP Equipment Description The Converged Cable Access Platform (CCAP) provides the layer 2 and layer 3 data forwarding services of a traditional CMTS and the video processing and modulation functions of an edge-QAM into a single platform. A CCAP can also support Ethernet Passive Optical Network (EPON) functionality, providing DOCSIS Provisioning of EPON (DPoE) services through access-side PON interfaces. The CCAP supports video services in the downstream and DOCSIS services in the downstream and upstream directions.
The CCAP is a full RF spectrum device, allowing 160 6-MHz QAM channels to be placed on the downstream for video and DOCSIS 3.0 services. In addition, the CCAP supports DOCSIS 3.1, allowing wider OFDM channels to be placed within the downstream spectrum. In the upstream, both DOCSIS 3.0 and 3.1 channels (OFDMA channels) are supported.
The platform is designed to be ultra-dense, meaning that the number of downstream RF interfaces in a CCAP is much greater than the number supplied on traditional headend equipment. The platform has a mid-plane architecture with active, replaceable line cards for data processing connected across the mid plane to passive physical interface cards (PICs) with RF interfaces. This allows line card redundancy and failover, as well as allowing line cards to be replaced without disconnecting cables from the RF interfaces on the PICs.
The combination of video and data processing, as well as the RF density of the CCAP, reduces the amount of equipment needed in the headend (CMTS, edge-QAM, and combining network). Note that modular CCAP and generations of CCAP equipment specifically targeted for Distributed Access Architectures (DAA) are out of scope for this document. Generations of CCAP equipment that include Ethernet Passive Optical Network (EPON) interfaces are also out of scope for this document.
8.2. CCAP Equipment Energy Metrics
The two metrics specified in the below subsections are to be used to evaluate the power consumption characteristics of CCAP equipment. It is important to note that evaluation and consideration of both metrics is required in order to ensure a comprehensive understanding of these characteristics.
Note that the metric specified in section 8.2.2 (Power Consumption per Throughput) is also applied to legacy I-CMTS equipment for comparing the power consumption of that equipment with that of CCAP equipment. See section 9.
8.2.1. CCAP Power Consumption per Service Group
The CCAP power consumption per service group shall be determined with the following metric:
CCAP Total Chassis Power (Watts)
Maximum Number of Service Groups supported by the chassis
CCAP Total Chassis Power (Watts) shall represent the total power consumption (in watts) of the CCAP chassis as determined by measurements at the power entry point just outside the chassis. Maximum Number of Service Groups supported by the chassis shall represent the highest number of Service Groups that can be supported in the chassis with the following constraints. The configuration for CCAP shall allow for the following cases:
a. A service group consisting of a single downstream RF port and two corresponding upstream RF ports.
b. A service group consisting of a single downstream RF port and a single corresponding upstream RF port.
The metric above shall be evaluated for both cases a. and b.
The applicable test procedures for evaluating the above metric are covered in sections 10.1, 10.2, 10.3, 10.4, 10.8, and their subsections.ANSI SCTE 232 pdf download.