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ACCULINK 316x DSU/CSU
Glossary-6 January 1997 3160-A2-GB21-50
LCD Liquid Crystal Display. Sealed glass plates containing liquid crystal material. When
voltage is applied, the amount of light passing through the plates is altered so that
messages may be displayed.
LCP Link Control Protocol.
LED Light-Emitting Diode. A status indicator that glows in response to the application of
a voltage.
link A communication path between two network nodes.
link layer protocol The protocol that regulates the communication between two network nodes.
link trap A trap that identifies the condition of the communications interface (linkDown or
linkUp traps).
LLB Line Loopback. Loops the received signal on the network interface back to the
network without change.
LOF Loss Of Frame. The inability to maintain frame synchronization.
LOFC Loss Of Frame Count. A count of the number of LOFs declared.
loopback test A test that verifies a device’s operation by connecting the device’s output to the
device’s input.
LOS Loss Of Signal. The T1 line condition where there are no pulses.
Lpbk branch Local Loopback branch of the DSU/CSU menu tree.
LQR Link Quality Reports.
manager (SNMP) The device that queries agents for management information, or receives unsolicited
messages (traps) indicating the occurrence of specific events.
master clock The master timing source used to synchronize all of the T1 and data port interfaces
on the DSU/CSU.
MB Megabytes. A unit of memory measurement equal to approximately one million
bytes (typically 1,048,576 bytes).
Mbps Megabits per second (million bits per second).
menu tree A display of DSU/CSU functions that are accessed by selecting various branches
(Status, Test, etc.).
MIB Management Information Base. A database of managed objects used by SNMP to
provide network management information.
MIB II MIB Release 2. The current Internet-standard MIB.
module A compact assembly functioning as a component in a larger system or unit.
MRU Maximum Request Unit.
multiplex To interleave or simultaneously transmit two or more messages on a single circuit.
network A configuration of data processing devices for information exchange.
network interface The T1 network interface connector on the rear panel of the DSU/CSU.
NMS Network Management System. A computer system used for monitoring and
controlling network devices.
node A connection or switching point on the network.
object (SNMP) A specific item within a Management Information Base (MIB).
OOF Out Of Frame. An error condition in which frame synchronization bits are in error.
option A hardware or software function that can be selected or enabled as part of a
configuration process.