ACCULINK 317x E1 DSU/CSU
Glossary-6
December 1996
3170-A2-GB20-20
Lpbk branch
Local Loopback branch of the E1 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.
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 E1 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.
MRU
Maximum Request Unit.
mobile switching center
A facility that provides overall control for a wireless communication system. Cell
sites are linked to the public telephone network through a mobile switching center.
network
A configuration of data processing devices for information exchange.
NETWORK interface
The network interface connectors on the rear panel of the E1 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.
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 DSU/CSU 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 DSU/CSU.
port
An access point for data entry or exit.
PORT (1– 4) interface
The synchronous data port interface on the E1 DSU/CSU.
POWER connector
The power input connector on the E1 DSU/CSU.
