1. Terminal and associated equipment and inside wiring located at a subscriber's premises and connected with a carrier's communication channel(s) at the demarcation point ("demarc").
Note 1: The demarc is a point established in a building or complex to separate customer equipment from telephone company equipment.
Note 2: Excluded from CPE are over-voltage protection equipment and pay telephones.
2. Items… (Read More →)

The segment of wiring from the customer's side of the protector to the customer premises equipment. [47 CFR Pt.36-A]

A device that provides an accessing arrangement at a user location to either switched or point-to-point, data-conditioned circuits at a specifically established data signaling rate.
Note: A CSU provides local loop equalization, transient protection, isolation, and central office loop-back testing capability.

Deprecated term. Seecustomer premises equipment.

In motion picture or television production or editing, an abrupt change from one scene to another.

A destructive technique for determining certain optical fiber transmission characteristics, such as attenuation and bandwidth, by (a) performing the desired measurements on a long length of the fiber under test, (b) cutting the fiber under test at a point near the launching end, (c) repeating the measurements on the short length of fiber, and (d) subtracting the results obtained on… (Read More →)

A waveguide, of adjustable length, which varies the attenuation of signals passing through it.

1. The frequency either above which or below which the output of a circuit, such as a line, amplifier, or filter, is reduced to a specified level.
2. The frequency below which a radio wave fails to penetrate a layer of the ionosphere at the incidence angle required for transmission between two specified points by reflection from the layer.

The highest order mode that will propagate in a given waveguide at a given frequency.

1. The wavelength corresponding to the cutoff frequency.
2. In an uncabled single-mode optical fiber, the wavelength greater than which a particular waveguide mode ceases to be a bound mode.
Note 1: The cutoff wavelength is usually taken to be the wavelength at which the normalized frequency is equal to
2. 40
5.
Note 2: The cabled cutoff wavelength is… (Read More →)