Glossary of Terms


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The telecommunications and fiber industries are full of terms and acronyms. Our glossary of terms attempts to capture some of them.

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SCAN: See Southwest Colorado Access Network

SDTV: See Standard Definition Television,

SDV: See Switched Digital Video.

Second Mile: Refers generally to the transport and transmission of data communications from the first point of aggregation (such as a remote terminal, wireless tower location, or HFC node) to the point of connection with the Middle Mile transport.

Selling, General, and Administrative Expense (SG&A): Corporate overhead costs, including expenses such as marketing, advertising, salaries and rent. SG&A is found on a corporate income statement as a deduction from revenues in calculating operating income.

Set Top Box (STB): The device used to translate IPTV signals to useful information to the customerís television.

SG&A: See Seling, General, and Administrative Expense.

Signal to Interference plus Noise Ratio (SINR): For a wireless communications device, the ratio of the received strength of the desired signal to the received strength of undesired signals (noise and interference).

Single Mode Fiber:

SINR: See Signal to Interference plus Noise Ratio.

Six Week Take Rate: A method of measuring take rate while correcting for newly released inventory. The six week take rate does not include addresses available for fewer than six weeks in the take rate denominator.

SLS Solutions: SLS Solutions is an ESRI GIS consulting service specializing telecommunications systems of record services.

Southwest Colorado Access Network:

Southwest Colorado Council of Governments (SWCCOG or COG): The Southwest Colorado Council of Governments (SWCCOG or COG) is a coalition of governments in the southwest region of colorado. For more information, visit the Region 9 Economic Development District web site for more information. The COG's chartering intergovernmental agreement can be found here.

Spectrum Allocation: The amount of spectrum dedicated (or allocated) to a specific use; in wireless, spectrum allocation is typically made in paired bands, with one band for upstream and the other for downstream.

Spectrum Band: The frequency of the carrier wave in wireless communications. Radios can transmit on different frequencies in the same area at the same time without interfering; frequency marks the division of different parts of spectrum for different uses. Frequency is measured in Hertz (Hz); the range of frequency typically used for radio communications is between 10,000 (10 kHZ) and 30,000,000,000 Hz (30 GHz). Different frequencies have different natural properties: Lower frequencies travel farther and penetrate solids better, while higher frequencies can carry more information (faster data rates, etc.) The best balance of these properties for the purpose of cell phones is in the range of roughly 700-2,500 MHz. A specific range of frequencies allocated for a specific purpose is called a "band".

SSB: See Subscriber Splice Box.

Standard Definition Television (SDTV):

STB: See Set Top Box.

Subscriber Splice Box (SSB): The splice point where the subscriber's drop level infrastructure enters the network. OHIvey prefers the term CAP.

SWCCOG: See Southwest Colorado Council of Governments.

Switched Digital Video (SDV): A network scheme for distributing digital video via a cable more efficiently to free up bandwidth for other uses. Only channels being watched by end-users in a given node are transmitted to that node.

Symmetrical: Internet connections have two components - a downstream and upstream. When the two speeds are comparable, the connection is termed symmetric. Fiber-optic networks more readily offer symmetrical connections than DSL and cable, which are inherently asymmetrical. Ultimately, purely symmetrical connections are less important than connections which offer robust connections in both directions. However, many asymmetrical connections via DSL and cable networks offer upload speeds that are too slow to take advantage of modern applications.

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