A signal sent from the called to the calling station, i.e., from the original data sink to the original data source.
Note: Backward signals are usually sent via a backward channel and may consist of supervisory, acknowledgment, or control signals.

The use of supervisory signal sequences from a secondary to a primary station.

Building Automation and Control Network

A program that attempts to propagate itself by e-mailing a copy of itself to e-mail addresses found on a recipient's hard drive. This is done without the consent or knowledge of the recipient.
Note: In many cases, this type of program does not attempt to cause any direct damage to user's system, but rather attempts to overload the e-mail distribution… (Read More →)

A technique for copy protection in which bad sectors are intentionally written on a diskette. [2382-pt.8]

In electrical circuits and networks, to adjust the impedance to achieve specific objectives, such as to reach specified return loss objectives at a hybrid junction of two-wire and four-wire circuits.

1. A measure of the degree of balance between two impedances connected to two conjugate sides of a hybrid set, coil, network, or junction.
2. A measure of the effectiveness with which a balancing network simulates the impedance of a two-wire circuit at a hybrid coil.

Pertaining to electrical symmetry.

1. In PCM systems, a code constructed so that the frequency spectrum resulting from the transmission of any code word has no dc component.
2. In PCM, a code that has a finite digital sum variation.

A transmission line consisting of two conductors in the presence of ground, capable of being operated in such a way that when the voltages of the two conductors at all transverse planes are equal in magnitude and opposite in polarity with respect to ground, the currents in the two conductors are equal in magnitude and opposite in direction.
Note: A… (Read More →)