FORE Systems ES-2810 Ethernet Switch User's Manual
Glossary - 19
Glossary
Glossary
J2 - Wide-area digital transmission scheme used predominantly in Japan that carries data at a
rate of 6.312 Mbps.
Jitter - analog communication line distortion caused by variations of a signal from its reference
timing position.
Joint Photographic Experts Group (JPEG) - An ISO Standards group that defines how to com-
press still pictures.
Jumper - a patch cable or wire used to establish a circuit, often temporarily, for testing or diag-
nostics; also, the devices, shorting blocks, used to connect adjacent exposed pins on a printed
circuit board that control the functionality of the card.
Kbps - kilobits per second (thousand)
LAN Access Concentrator - a LAN access device that allows a shared transmission medium to
accommodate more data sources than there are channels currently available within the trans-
mission medium.
LAN Emulation Address Resolution Protocol (LE_ARP) - A message issued by a LE client to
solicit the ATM address of another function.
LAN Emulation Client (LEC) - the component in an end system that performs data forwarding,
address resolution, and other control functions when communicating with other components
within an ELAN.
LAN Emulation Configuration Server (LECS) - the LECS is responsible for the initial configura-
tion of LECs. It provides information about available ELANs that a LEC may join, together
with the addresses of the LES and BUS associated with each ELAN.
LAN Emulation Server (LES) - the LES implements the control coordination function for an
ELAN by registering and resolving MAC addresses to ATM addresses.
LAN Emulation (LANE) - technology that allows an ATM network to function as a LAN back-
bone. The ATM network must provide multicast and broadcast support, address mapping
(MAC-to-ATM), SVC management, and a usable packet format. LANE also defines Ethernet
and Token Ring ELANs.
lane - a program that provides control over the execution of the LAN Emulation Server (LES),
Broadcast/Unknown Server (BUS), and LAN Emulation Configuration Server (LECS) on the
local host.
Latency - The time interval between a network station seeking access to a transmission chan-
nel and that access being granted or received.
Layer Entity - an active layer within an element.
Layer Function - a part of the activity of the layer entities.
Layer Service - a capability of a layer and the layers beneath it that is provided to the upper
layer entities at the boundary between that layer and the next higher layer.
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