Technical data

152 Theoretical and general applications www.westermo.com
IP Address The IP address is a 32-bit number that identifies a network
device.The IP address is made up of two parts. Firstly, the identifi-
er of a particular network and secondly an identifier of the partic-
ular device on that network. Due to the finite number of IP
addresses with a 32-bit number a new IPv6 address method is
now being implemented.
ISDN Integrated Services Digital Network, standard concerning digital
networks for telecommunication, data, fax, video and video
telephony.
Isolator Provides galvanic isolation between communicating units.
ISP Internet Service. Provider. A company that provides a link to the
Internet.
LAN A Local Area Network is a group of computers or Ethernet
devices that share a common communications structure. LANs
can range in size from a couple of devices to many hundreds.
LAPM Link Access Procedure for Modems, a method for error
correction when transferring via telephone modems.
LCD Liquid Crystal Display, display made up of liquid crystals.
Leased line A 2-/4-wire connection rented from a telephone company.
It can either be a point to point or a multidrop connection.
LED Light Emitting Diode, semiconductor that transmits light when
exposed to an electric current.
Line sharer Divides a single data line into several, for example, when two or
more computer users need to share common equipment.
Local modem See short-haul modem.
M2M Machine-to-Machine, abbreviation of
“Machine to machine communication”.
MAC Address The Media Access Control address in the unique hardware num-
ber that is assigned to the Ethernet Device during manufacture.
Normally, the MAC address cannot be altered.
MAN Metropolitan Area Networks. Name for networks shared by sev-
eral interested parties, usually within the same town or area.
Manchester A modulation method that simplifies the locking of the
coding symbol clock.
Master Main device that polls slaves in a polled system.
B A C K