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E
ELAN (Emulated Local Area Network). A LAN
segment implemented with IBM Technology.
ESI (End System Identifier). A - byte component of
an ATM address.
F
FC LANE (Forum Compliant LAN Emulation). ATM
Forum compliance rules.
FPGA (Field Programmable field array). Module on
which logic functions can be programmed.
I
IBUS (Intelligent Broadcast Unknown Server). A
LAN Emulation optimization designed to limit the
scope of unknown unicast frames sent to the BUS
ICMP (Internet Control Message Protocol). A
protocol for communicating control information over
IP.
IEEE (Institute of Electrical and Electronic
Engineers). An organization involved in establishing
Local Area Network standards.
IETF (Internet Engineering task force). An
organization that product Internet Specifications
Interim Local Management Interface (ILMI). The
standard (part of the UNI specification) for
management of ATM networks. ILMI uses the SNMP
protocol and a special UNI MIB to provide full
information on the ATM network.
IP (Internet Protocol). A widely-use network layer
protocol specified by the IETF.
IPX (Internet Packet exchange). A network layer
protocol that is frequently used by personal computer
systems.
ISO (International Standard Organization). An
organization that specifies International
Communication Standards
isochronous. Literally “in the same time”. An
isochronous bit stream is one that goes at a constant
rate. The term isochronous is often used colloquially
to mean “digitally encoded voice”. The term is not
often used in the world of data communications but is
a common term in the voice communications and
engineering context.
J
JPEG (Joint Picture Experts Group). A Standard
body defining image compression methods.
L
LANE or LE (LAN emulation). The service provided
by an ATM network to allow it to emulate a
conventional LAN. Permits existing LAN based
applications to communicate over ATM without any
change being required.
LEC (LAN Emulation Client). A LAN emulation
component that represent users of the emulated LAN.
LECS (LAN Emulation Configuration Server). A LAN
emulation service component the centralize and
disseminates configuration data as LES address.
LES (LAN Emulation Server). A LAN emulation
service component that resolves LAN destinations to
ATM addresses.
LIS (Logical IP Subnet). An IP subnet implemented
with ATM technology.
LLC (Logical Link Control). The top sublayer of the
Data Link layer, which is layer 2 of the ISO model.
M
MAC (Medium Access Control). The bottom
sublayer of the data link layer, which is layer 2 of the
ISO model.
MIB (Management Information Base). A network
management base supporting the monitoring and
control of network elements.
MPEG (Motion Picture Experts Group). A Standard
body defining compression techniques for motion
pictures such as MPEG-1 and MPEG-2 NTSC.
MSS (Multiprotocol Switched Services). A
component of IBM′s Switched Virtual Networking
(SVN) framework.
MTU (Maximum Transmission Unit). The maximum
amount of user data that can be transmitted as a
single unit (frame) on a communication link.
multicast. Operation where a message is sent
simultaneously to a number of stations. Similar to
broadcast, in principle, but usually only to a subset of
the total number of stations on a network.
multipoint-to-point connection. A multipoint-to-point
connection consists of a simple tree topology
considered as a root node connected to many leaves.
A multipoint-to-point connection has zero bandwidth
286 ATM Workgroup Solutions: Implementing the 8285 ATM Switch