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Appendix C: Glossary
Megabit Modem 410F and 420F User Manual 89
NVRAM Non-Volatile Random Access Memory is a medium for storing system configuration
information, so the information is not lost when the system is reset.
octet A TCP/IP term indicating eight bits.
PDU Protocol Data Unit is data as it appears at the interface between a particular sublayer
and the sublayer immediately below.
QoS Quality of Service is the configured traffic parameters that are assigned to a virtual
circuit, which specifies how quickly and how accurately data is transferred from the
sender to the receiver.
RFC Request For Comment is a series of notes that contain surveys, measurements, ideas,
techniques, and observations, as well as proposed and accepted TCP/IP protocol
standards. RFCs are available on the Internet.
RIP Routing Information Protocol allows routers to update the routing tables
automatically (for example, with information such as how many hops between
destinations). The version of RIP you select for the connection must match the
version supported by the service provider. Versions RIP1 and RIP-1 compatible use
for broadcast. Version RIP 2 uses multicast.
SEF Severely Errored Frames is the incoming signal has at least four consecutive errored
framing patterns.
SES Severely Errored Seconds is the seconds during which more than 2,500 bipolar errors
are detected on the line.
SNMP Simple Network Management Protocol is a protocol that specifies how to send
information between a NMS and managed devices on a network. The managed
devices run a program called an agent. The agent interprets SNMP request and
responds to them. SNMP is used to set device configurations, read device
configurations, or read the device status.
Spanning Tree A bridging protocol that detects and prevents loops from occurring in a system
containing multiple bridges.
subnet mask A type of IP address that allows a site to use a single IP address for multiple physical
networks.
TCP Transmission Control Protocol is a transport protocol used to map inbound traffic
(from a remote IP address) to an internal (LAN) IP address. Establishes connection
with remote user before data transmission.
TCP/IP Transmission Control Protocol/Internet Protocol is a protocol used for
communications between computers over networks and the Internet.