Paradyne 336x E1 manual Pdu

Glossary

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 ªonesº (marks, pulses) is not adequate for
	the line requirement.

Perf branch

PLB

port

PORT (1± 4) interface POWER connector power-up self-test

Performance Report branch of the E1 NTU menu tree.

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.

An access point for data entry or exit.

The synchronous data port interface on the E1 NTU.

The power input connector on the E1 NTU.

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.
primary clock	The primary timing source used to synchronize all of the E1 and data port interfaces
	on the E1 NTU.
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.
Ptrns branch	Test Patterns branch of the E1 NTU menu tree.
pulse density	A measure of the number of ªonesº (marks, pulses) in relation to the total number
	of bits transmitted.
QRSS Test	Quasi-Random Signal Test. A test pattern simulating a random pattern of digital
	ones and zeros used to simulate normal transmission.
RAI	Remote Alarm Indication. A remote alarm on an E1 line.
RAM	Random-access memory. Read/write memory that is volatile and loses its contents
	when power is removed.
register	A part of the device's memory that holds stored values.
Rel branch	Release branch of the E1 NTU menu tree.

3360-A2-GB20-20 December 1996 Glossary-7