ANSI SCTE 177-2018 pdf download.Specification for Braided 75 Ω, Mini-Series Quad Shield Coaxial Cable for CMTS and SDI cables
1.2. Scope
This specification defines the required performance with regards to electrical and mechanical properties of 75-ohm, braided, mini-series quad shield coaxial cable for CMTS and SDI applications. These cables are used in the transmission of RF signals and power for voice, data and video applications. Cables meeting the requirements within this standard are for use with interior applications. Use within exterior applications is outside the scope and requirements of this document. This document provides specifications or procedures for frequencies up to 1218 MHz. DOCSIS 3.1 specifications include operation at frequencies up to 1218 MHz, and optionally, to 1794 MHz. Specifications or procedures for frequencies above 1218 MHz should be considered in a future revision of this document.
2. Normative References
The following documents contain provisions, which, through reference in this text, constitute provisions of this document. At the time of Subcommittee approval, the editions indicated were valid. All documents are subject to revision; and while parties to any agreement based on this document are encouraged to investigate the possibility of applying the most recent editions of the documents listed below, they are reminded that newer editions of those documents might not be compatible with the referenced version.
4. Compliance Notation
This word or the adjective“required’ means that the item is an absolute requirement of this document. This phrase means that the item is an absolute prohibition of this document. This word means the value specified shall never be used. This word or the adjective“recommended’ means that there may exist valid reasons in particular circumstances to ignore this item, but the full implications should be understood and the case carefully weighted before choosing a different course. This phrase means that there may exist valid reasons in particular circumstances when the listed behavior is acceptable or even useful, but the full implications should be understood and the case carefully weighed before implementing any behavior described with this label. This word or the adjective“optional” means that this item is truly optional. One vendor may choose to include the item because a particular marketplace requires it or because it enhances the product, for example; another vendor may omit the same item. Use is permissible for legacy purposes only. Deprecated features may be removed from future versions of this document. Implementations should avoid use of deprecated features.
5.2. Definitions
The decrease in magnitude of a wave as it travels through any transmitting medium, such as cable or circuitry. It is the difference between transmitted and received power. A type of cable used for broadband data and cable systems, composed of a center conductor, insulating dielectric, conductive shield and optional protective covering. The ability of a material to allow electrons to flow, measured by the curent per unit of voltage applied. It is the reciprocal of resistivity. The difference between the minimum and maximum dimensions over the first laminated shield tape. The opposition a conductive material offers to current flow, measured in ohms. A resistance measurement of the center conductor and outer conductor when connected in series (measured in ohms/ 1000 feet or ohms/km). A nonconductive insulator material between the center conductor and outer conductor of coaxial cable.
The ability of the drop cable insulation to withstand a minimum specified voltage. The total opposition a circuit, cable or component offers to alternating current flow. It includes both resistance and reactance and is generally expressed in ohms and designated by the symbol Z. International Annealed Copper Standard (IACS) set the conductivity of copper at 100% in 1913 and was adopted by the International Electro-Technical Commission (IEC). The conductivity of an electrical conductor is expressed in units of a percentage of IACS.ANSI SCTE 177-2018 pdf download
