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Glossary
Glossary-73170-A2-GB20-20 December 1996
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.
primary clock The primary timing source used to synchronize all of the E1 and data port interfaces
on the E1 DSU/CSU.
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 DSU/CSU menu tree.
pulse density A measure of the number of “ones” (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 DSU/CSU menu tree.
reset A reinitialization of the E1 DSU/CSU that occurs at power-up or in response to a
reset command.
RFC
Request for Comments. The set of documents that describes the standard
specifications for the TCP/IP protocol suite.
RIP Routing Information Protocol. A protocol used to add routes in the Internet.
RJ48C An 8-position modular connector.
RLB Repeater Loopback. Loops the signal being sent to the network back to the DTE
Drop/Insert and data ports after it has passed through the framing circuitry of the E1
DSU/CSU.
Rlpbk branch Remote Loopback branch of the E1 DSU/CSU menu tree.
router
A device that connects LAN segments.
RS-232 An EIA standard for a low-speed, 25-position, DCE/DTE interface.
RS-232-like MIB Defines objects for managing RS-232-type interfaces (e.g., RS-422, RS-423, etc.)
and supports synchronous data ports and management communication ports on the
E1 DSU/CSU.
RS-449 An EIA standard for a general-purpose, 37-position, DCE/DTE interface.
RTS Request-to-Send. V.24 circuit 105.
RX
Receive. T
o obtain signals that have been transmitted.
RXC
Receive Clock. V
.24 circuit 115.
RXD
Receive Data. V
.24 circuit 104.
secondary clock
The secondary clock source used to provide timing to the E1 DSU/CSU when the
primary clock fails.