3Com DIA3CV1100-02 manual Glossary

GLOSSARY 43

GLOSSARY

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.