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Appendix D: Glossary
MM701G and MM702G User Manual 151
MAC
Media Access Control is a physical address associated with a device such as a NIC.
For modem configuration, the MAC is used to map inbound traffic (from a remote IP
address) to an internal (LAN) IP address. Used with 1483 Bridging/Routing Mode.
margin
The noise margin in decibels that the modem must achieve with a BER of 10
-7
or
better to successfully complete initialization.
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.
NAT
Network Address Translation provides the means to map private IP addresses (LAN
IP addresses) to public IP addresses (WAN session IP addresses).
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.