User's Manual

Glossary
BreezeMAX Modular Base Station System Manual 283
ITU-T International Telecommunication Union - Telecommunications. An
intergovernmental organization through which public and private
organizations develop telecommunications. The ITU was founded in
1865 and became a United Nations agency in 1947. It is responsible
for adopting international treaties, regulations and standards
governing telecommunications. The standardization functions were
formerly performed by a group within the ITU called CCITT, but after
a 1992 reorganization the CCITT no longer exists as a separate
entity.
L2TP Layer 2 Tunneling Protocol. An extension to the PPP protocol that
enables ISPs to operate Virtual Private Networks (VPNs). L2TP
merges the best features of two other tunneling protocols: PPTP from
Microsoft and L2F from Cisco Systems. Like PPTP, L2TP requires
that the ISP's routers support the protocol.
LAN Local area Network. A computer network limited to a small
geographical area, such as a single building. The network typically
links PCs as well as shared resources such as printers.
LED Light Emitting Diode.
LOS Line Of Sight. A condition where a signal travels over the air directly
from a wireless transmitter to a wireless receiver without passing an
obstruction.
LVDS Low Voltage Differential Signaling. A low noise, low power, low
amplitude method for high-speed (gigabits per second) data
transmission over copper wire.
MAC Media Access Control. The lower of the two sub-layers of the data
link layer defined by the IEEE. The MAC sub-layer handles access to
shared media, such as whether token passing or contention will be
used.
MAC Address Standardized data link layer address that is required for every port
or device that connects to a LAN. Other devices in the network use
these addresses to locate specific ports in the network and to create
and update routing tables and data structures. MAC addresses are
6bytes long and are controlled by the IEEE.
MAN Metropolitan Area Network. A data network designed for a town or
city. In terms of geographic breadth, MANs are larger than local-area
networks (LANs), but smaller than wide-area networks (WANs).