ACCULINK 3350 E1 NTU
Glossary-6
June 1996
3350-A2-GB20-10
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.
MRU
Maximum Request Unit.
module
A compact assembly functioning as a component in a larger system or unit.
network
A configuration of data processing devices for information exchange.
network interface
The HDSL Network interface connector on the rear panel of the E1 NTU.
NMS
Network Management System. A computer system used for monitoring and
controlling network devices.
node
A connection or switching point on the network.
NTU
Network Termination Unit. The tributary unit on the customer end of an HDSL
link. (The LTU is on the network end.)
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.
PAP
Password Authentication Protocol.
parity
A way of checking data accuracy by counting the number of bits that have a value
of one.
payload
The information bits in a frame.
PBX
Private Branch Exchange. Telephone switching equipment dedicated to one
customer. A PBX connects private telephones to each other and to the public
network.
PC
Personal computer. In this document, references to a PC imply an IBM PC or an
IBM-compatible PC.
PDU
Protocol Data Unit. Used when adding routes in the Internet.
PDV
Pulse Density Violation. The number of “ones” (marks, pulses) is not adequate for
the line requirement.
Perf branch
Performance Report branch of the E1 NTU menu tree.
PLB
Payload Loopback. Loops the received signal on the network interface back to the
network after it has passed through the framing circuity of the E1 NTU.
port
An access point for data entry or exit.
POWER connector
The power input connector on the E1 NTU.
power-up self-test
A test that checks most hardware components when power is applied to the device
or a reset is initiated.
PPP
Point-to-Point Protocol. A link layer protocol used by SNMP.
PRBS
Psuedo-Random Bit Sequence. A test pattern containing any possible combination
of digital ones and zeros for a given string length.
PRM
Performance Report Message. A message indicating performance data such as
errored seconds, unavailable seconds, etc.
protocol
A set of rules that determines the behavior of functional units in achieving
communication.
