Appendix D: Glossary

MAC

margin

MIB

NAT

NVRAM

octet

PAP/CHAP

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.

The noise margin in decibels that the modem must achieve with a BER of 10 -7or better to successfully complete initialization.

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.

Network Address Translation provides the means to map private IP addresses (LAN IP addresses) to public IP addresses (WAN session IP addresses).

Non-Volatile Random Access Memory is a medium for storing system configuration information, so the information is not lost when the system is reset.

A TCP/IP term indicating eight bits.

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

POTS

PPP

proxy IP address

PVC

Protocol Data Unit is data as it appears at the interface between a particular sublayer and the sublayer immediately below.

Plain Old Telephone Service.

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.

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.

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.

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