ANSI SCTE 239-2017 pdf free download – United States Department of Homeland Security SHARES Overview – Operational Practice for Cable Sector Operators.
1.2. Scope
This document and the SHARES Network is meant to serve as a reliable last mode of communicationduring extreme incidences or high risk events. Risks include but are not limited to extreme weather suchas hurricane, tsunami or blizzards; extended grid power outages, man-made incidents such as cyber-attacks or times where multiple incidents are happening at the same time resulting in traditionalcommunications outages.
1.3. Benefits
Failure to prepare for communications outage can result in extended restore periods.This document willhighlight operational practices necessary to prepare for the use of HF radio when attempting to restoretraditional modes of communications. By joining the SHARES program through partnership with SCTEISBE licensed HF station members will gain access to a deep directory of contacts that includes DHS,FEMA, National Guard and other key restoration agencies. This directory can prove to be an invaluableresource when attempting to restore services and gain access to fuel, security and restoration zone accessin time of need.Finally, by participating in SHARES and becoming familiar with this document, thecable industry will become better prepared for disasters threatening the essential services the millions ofcustomers depend on every day for business, security, entertainment and communications.
1.4. Intended Audience
Cable operator business continuity mangers, regional directors, government relations, supply chainmangers, security, and network operational center professionals will benefit from reviewing thisdocument.
1.5. Areas for Further Investigation or to be Added in Future VersionsNone at time of publication.
2. Normative References
The following documents contain provisions, which, through reference in this text, constitute provisionsof this document. At the time of Subcommittee approval, the editions indicated were valid.All documentsare 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 arereminded that newer editions of those documents might not be compatible with the referenced version.
2.1. SCTE References
No normative references are applicable.
2.2. Standards from Other Organizations
No normative references are applicable.
2.3. Published Materials
No normative references are applicable.
3. Informative References
The following documents might provide valuable information to the reader but are not required when complying with this document.
3.1. SCTE References
SCTE 208 2014 Business Continuity
SCTE 227 2015 Location Risk Assessment
SCTE 226 2015 Facility Classification
3.2. Standards from Other Organizations
No informative references are applicable.
3.3. Published Materials
United States Department of Homeland Security United States Coast Guard Radiotelephone
Handbook CGTTP 6-01.1A January 16, 2013
Guide to Radio Communications Standards for US Department of Environmental Management
(DEM) Emergency Responders
http://www.dtic.mil/jcs/j6/cceb/acps/acp125f.pdf
SHARES Form1
https://www.dhs.gov/sites/default/files/publications/SHARES%20Form%201.pdf
Amateur Radio Emergency Service® ARES Field Resources Manual

ARRL HF Safety Reference Introduction to Emergency Communication Course,
http://www.arrl.org/emergency-communications-training
ARRL Grounding and Bonding for the Radio Amateur,
http://a.co/dzVD8rw
FCC Guide to RF Potential Hazards
https://www.fcc.gov/Bureaus/Engineering_Technology/Documents/bulletins/oet56/oet56e4.pdf
6. High Frequency Radio Fundamentals Before registering as a SHARES participant it is helpful to understand some fundamental principles regarding high frequency (HF) radio communications. This section is not intended to be a full blown training or comprehensive information section; however, it is intended to introduce the fundamentals of what enables the SHARES communication. HF radio is one segment of the overall radio spectrum. Lower frequencies have longer wavelengths and higher frequencies have shorter wavelengths. A wavelength is the time required for a signal to complete one complete cycle. It is important to note, that antennas need to match the desired transmit and receive frequencies/bands that communications are destined for. Higher frequencies require smaller antennas and lower frequencies need larger antennas. For example, one of the antennas in use at SCTE in support of the SHARES frequencies requires 90 feet total to cover the wavelengths in the allocated spectrum. Matching antenna to allocated frequencies is essential.ANSI SCTE 239 pdf download.