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Glossary
GL-8
February 2001 3160-A2-GB21-90
PRM
Performance Report Messages. Messages indicating the current state of a T1 line as
specified by ANSI-T1-403.
protocol
A set of rules that determines the behavior of devices in achieving and maintaining
communication.
PSTN
Public Switched Telephone Network. A network shared among many users who can use
telephones to establish connections between two points. Also known as dial network.
Ptrns branch
Test Patterns branch of the 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
Quasi-Random Signal Source. A test pattern simulating a random pattern of digital ones
and zeros used to simulate normal transmission.
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 DSU/CSU menu tree.
reset
An initialization of the device that occurs at power-up or in response to a reset command.
RFC
Request for Comments. One of the documents published by the Internet Engineering Task
Force that describe Internet protocols and policies.
RIP
Routing Information Protocol. A protocol for exchanging routing information.
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 device.
Rlpbk branch
Remote Loopback branch of the DSU/CSU menu tree.
router
A device that connects LANs by dynamically routing data according to destination and
available routes.
RS-232
An Electronic Industries Association’s standard for a low-speed, 25-position, DCE/DTE
interface.
RS-232-like MIB
RFC 1659, which 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 device.
RS-449
An Electronic Industries Association’s standard for a general-purpose, 37-position,
DCE/DTE interface.
RTS
Request to Send. A signal from the DTE to the device, indicating that the DTE has data to
send. V.24 circuit 105.
RX
Receive. To obtain transmitted signals.
RXC
Receive Clock. V.24 circuit 115.
RXD
Received Data. Pin 3 of the EIA-232 interface that is used by the DTE to receive data from
the modem. Conversely, the modem uses Pin 3 to transmit data to the DTE.
SDCP
Shared Diagnostic Control Panel. A feature that allows carrier-mounted devices to share the
same diagnostic control panel.
self-test
A test that checks most hardware components when power is applied to the device or a
reset is initiated.