Super Head End

Of a communications or power cable, the outer covering or coverings of tough material, often plastic, that is resistant to environmental hazards such as abrasion, liquid intrusion, solar radiation, etc. , and is used to protect cable component(s) such as optical fibers or metallic conductors that transport the signal or power.
Note: There may be more than one sheath surrounding… (Read More →)

The actual length of cable in route kilometers. [47 CFR Pt.36-A]

The actual length of cable in route miles. [47CFR]

In a computer environment, an operating system command interpreter, i.e., a software utility that reads an input specifying an operation, and that may perform, direct, or control the specified operation.
Note 1: For example, a shell may permit a user to switch among application programs without terminating any of them.
Note 2: A shell may take its input from either… (Read More →)

Abbreviation for super high frequency. See electromagnetic spectrum.

1. A housing, screen, sheath, or cover that substantially reduces the coupling of electric, magnetic, or electromagnetic fields into or out of circuits or transmission lines.
2. A protective cover that prevents the accidental contact of objects or persons with parts or components operating at hazardous voltage levels.

[A] room or container designed to attenuate electromagnetic radiation. [INFOSEC-99]

A 2-wire transmission line surrounded by a sheath of conductive material that protects it from the effects of external fields and confines fields produced within the line.

A transmission line composed of a twisted 2-wire metallic transmission line surrounded by a sheath of conductive material that protects it from the effects of external fields and confines fields produced within the line.