Glossary
Hardware Flow Control B
Hardware Flow Control
A hardware method of controlling data flow between two devices. The receiving device tells the sending device to start or stop data transmission by sending control signals on a cable wire that is dedicated to flow control signals.
Horizontal Cabling
The cabling between a telecommunications outlet and a horizontal
Horizontal Cross-Connect
A group of connectors, such as a patch panel or
Impedance
Opposition to the flow of ac (alternating current) signals. Impedance is caused by inductance and capacitance. Unlike resistance, impedance varies with the frequency of the applied ac signal.
Impedance Discontinuity
An abrupt change in a cable’s characteristic impedance. Impedance discontinuities can be caused by faulty connections, mismatched cable types, and untwisted sections on twisted pair cable. Also called an anomaly.
Inductance
A property of a device that tends to oppose changes in current. Inductance is an undesirable characteristic of cables because it causes signal attenuation.
Inductive Pickup
A device that emits sound when placed near a source of electromagnetic emissions.
Jabber
A network fault condition where a frame longer than 1518 bytes is detected. Network protocols specify a maximum packet length that one station may transmit before other stations are allowed to transmit.
