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
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).
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.
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
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