Glossary - 20
FORE Systems ES-2810 Ethernet Switch User's Manual
Glossary
Layer User Data - the information transferred between corresponding entities on behalf of the
upper layer or layer management entities for which they are providing services.
le - a FORE program that implements both the LAN Emulation Server (LES) and the Broad-
cast/Unknown Server (BUS).
Leaky Bucket - informal cell policing term for the Generic Cell Rate Algorithm which in effect
receives cells into a bucket and leaks them out at the specified or contracted rate (i.e., PCR).
Least Significant Bit (LSB) - lowest order bit in the binary representation of a numerical value.
lecs - a FORE program that implements the assignment of individual LECs to different emu-
lated LANs.
leq - a FORE program that provides information about an ELAN. This information is obtained
from the LES, and includes MAC addresses registered on the ELAN together with their corre-
sponding ATM addresses.
Line Build Out (LBO) - Because T1 circuits require the last span to lose 15-22.5 dB, a selectable
output attenuation is generally required of DTE equipment (typical selections include 0.0, 7.5
and 15 dB of loss at 772 KHz).
Line Code Violations (LCV) - Error Event. A Line Coding Violation (LCV) is the occurrence of
either a Bipolar Violation (BPV) or Excessive Zeroes (EXZ) Error Event.
Link - An entity that defines a topological relationship (including available transport capacity)
between two nodes in different subnetworks. Multiple links may exist between a pair of sub-
networks. Synonymous with logical link.
Link Access Procedure, Balanced (LAPB) - Data link protocol in the X.25 protocol stack. LAPB
is a bit-oriented protocol derived from HDLC. See also HDLC and X.25.
Link Down Trap - an SNMP trap, sent when an interface changes from a normal state to an
error state, or is disconnected.
Link Layer - layer in the OSI model regarding transmission of data between network nodes.
Link Up Trap - an SNMP trap, sent when an interface changes from an error condition to a nor-
mal state.
Load Sharing - Two or more computers in a system that share the load during peak hours.
During periods of non peak hours, one computer can manage the entire load with the other
acting as a backup.
Local Access and Transport Area (LATA) - Geographic boundaries of the local telephone net-
work, specified by the FCC, in which a single LEC may perform its operations. Communica-
tions outside or between LATAs are provided by IXCs.
Local Area Network (LAN) - a data network intended to serve an area of only a few square kilo-
meters or less. Because the network is known to cover only a small area, optimizations can be
made in the network signal protocols that permit higher data rates.
To Next Page
Loading...
