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G
LOSSARY
43
G
LOSSARY
ac
Alternating Current. Electric current that reverses its direction of flow
periodically according to frequency measured in hertz, or cycles per
second.
CO
Central Office. A card in the VCN AC chassis; the card provides an
Ethernet port and an LMA port; another name for the Line Card (LC).
EMC
Electromagnetic compatibility
HDLC
High-level Data Link Control. HDLC is a bit oriented, synchronous
protocol that applies to the data-link message packaging layer (layer 2
of the ISO/OSI model) for computer communications. messages are
transmitted in units called frames, which contain differing amounts of
data but which must be organized in a particular way.
Hz
Abbreviation for hertz, electrical cycles pr second.
ID
Identifier used for the management login procedure.
ISP
Internet service Provider. A business that supplies Internet connectivity
services to individuals, businesses and other organizations within a local
area.
IT
Information Technology
Krone connectors
Connectors on patch cords used to connect or jumper patch panels
LAN
Local Area Network. A group of computers and other devices dispersed
over a relatively limited area and connected by a communications link
that enables every device to interact with any other on the network.
LED
Light Emitting Diode. A semi-conductor device that converts electrical
energy into light, used, for example, for the activity lights on the VCN
AC and VCN AP units and appears in green or orange.
LMA
Local Management Access.