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Glossary
iSPAN PRI PCI ISDN Users Guide 137
Kbps (Kilobits per second)
KBps (Kilobytes per second)
LAN (Local Area Network)
◆ A data communications system
designed to operate over a limited geographic distance, such as a single
building.
LAP-D (Link Access Procedure-D) ◆ A Data Link layer procedure
using D channel communications, typical of ISDN.
LATA (Local Area Transport Area) ◆ This is the territory covered by
an individual local telephone operating company.
LEC (Local Exchange Carrier) ◆ The local phone company – either a
Regional Bell Operating Company (RBOC) or an independent phone
company – that provides local transmission services.
LED ◆ Light Emitting Diode
LLC (Logical Link Control) ◆ The upper half of the Data Link layer in
LANs. Performs error control, broadcasting, multiplexing, and flow
control functions. See also MAC (Medium Access Control).
LLC/SNAP (Logical Link Control/SubNetwork Attachment Point)
local ♦ Describes files and devices, such as disk drives, that are
attached to, or on, your machine.
Loop Qualification ♦ This is a test done by the phone company to
make sure the customer is within the maximum distance of 18,000 feet
from the central office that serves that customer. (ISDN service could
be available at a longer distance than that with a repeater.)
LOS (Loss Of Signal) ♦ PRI alarm.
LT (Line termination) ♦ The equivalent of the NT1 function at the
Central Office.
MAC (Medium Access Control) ♦ A set of protocols that are the
lower part of the Data Link layer and comprise the basis of the IEEE
LAN specifications. In general, MAC determines the way devices can
transmit in a broadcast network. See also LLC (Logical Link Control).
Mbps (Megabits per second) ◆ Transmission speed or rate of one
million bits per second.
MBps (Megabytes per second) ◆ Transmission speed or rate of one
million bytes per second or 8 Mbps.