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Appendix D: Glossary
Megabit Modem 400F, 500L, 600F, and 700F User Manual 119
MIB Management Information Base is a set of variables that define the configuration and
status parameters for network management. Network management stations can
retrieve information from and write information to an MIB. The Internet Engineering
Task Force (IETF) specifies standard MIBS for certain types of devices, ensuring any
NMS can manage the devices. Vendors can specify proprietary MIBs for their devices
to fit specific needs.
NAPT Network Address and Port Translation provides the means to map private IP
addresses and TCP/UDP ports to the public IP addresses (proxy addresses) and
TCP/UDP ports that are set up for the PPP sessions. Used with PPP Mode.
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.
PAP/CHAP Password Authentication Protocol and Challenge Handshake Authentication Protocol
are two ways to authenticate PPP sessions. With PAP, the modem sends
authentication requests to the service provider and authentication occurs only once
during the life of the link.
In CHAP, the service provider returns an authentication challenge to the modem
during authentication. CHAP can be renegotiated during the life of the link. Also, both
the modem and the service provider must support clear text versions of the
password. The CHAP host field must be the same on both ends of the session.
PDU Protocol Data Unit is data as it appears at the interface between a particular sublayer
and the sublayer immediately below.
POTS Plain Old Telephone Service.
PPP Point-to-Point Protocol exists between the hardware layer and the network-layer
interface protocols. It is a widely used protocol for establishing connections on the
Internet. PPP provides the set up and release of connections for each session.
PAP/CHAP provide the authentication for the PPP sessions.
proxy IP address The proxy IP address is the WAN IP address for one of the 32 sessions. The proxy
IP address is used to enter static NAT entries. See IP address.
PVC Permanent Virtual Circuit is a logical connection comprised of a predefined static
route across a packet-switched network that is always in place and always available.
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.