Glossary
X320R User’s Guide
101
IP address - A 4-byte number uniquely defining each host on the Internet.
Ranges of addresses are assigned by Internic, an organization formed for this pur-
pose. Usually written in dotted-decimal notation with periods separating the bytes
(for example, 134.177.244.57).
ISP (Internet Service Provider) - The telecommunications company providing
subscriber access into the Internet.
Kft (Kilofeet) - A thousand feet.
Kbps (Kilo-bits per second) - A measurement of digital bandwidth where one
Kbps equals one thousand bits per second.
LAN (Local Area Network) - A data network covering a small area, usually
within the confines of a building or floors within a building. Ethernet is a common
LAN protocol. See also WAN (Wide Area Network).
Last mile - Refers to the local loop and is the difference between a local telephone
company office and the customer premises; a distance of about 3 miles or 4 kilo-
meters.
Latency - The delay in time between the sending of a unit of data at one end of a
connection until the receipt of that unit at the destination.
Layer - OSI reference model; each layer performs certain tasks to move the infor-
mation from the sender to the receiver. Protocols within the layers define the
tasks for the networks but not how the tasks are accomplished.
LMI - Local Management Interface
Local Loop - A generic term for the connection between the customer’s premises
and the telephone company’s serving central office. The local loop is the pair of
copper wires that connects the end user to the central office, which is the gateway
to the telecommunications network.
LT (Line Termination) - Refers to the mode of an equipment that exists on the net-
work side, terminating the end user’s line. See also NT.
MAC address (Media Access Control address) - A Layer 2 hardware address that
uniquely identifies each node of a network.
Mbps (Million bits per second) - A measurement of digital bandwidth where one
Mbps equals one million bits per second.
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