Netcom NB9 - Manual (Page 78)

78 NB9/NB9W ADSL+ VoIP Router
YML790 Rev8
Microfilter In splitterless deployments, a microfilter is a device that removes the data frequencies in the DSL signal, so that
telephone users do not experience interference (noise) from the data signals. Microfilter types include in-line (installs
between phone and jack) and wall-mount (telephone jack with built-in microfilter). See also splitterless.
NAT Network Address Translation A service performed by many routers that translates your network’s publicly known
IP address into a Private IP address for each computer on your LAN. Only your router and your LAN know these
addresses; the outside world sees only the public IP address when talking to a computer on your LAN.
NAT rule A defined method for translating between public and private IP addresses on your LAN.
network A group of computers that are connected together, allowing them to communicate with each other and share
resources, such as software, files, etc.A network can be small, such as a LAN, or very large, such as the Internet.
network mask A network mask is a sequence of bits applied to an IP address to select the network ID while ignoring the host
ID. Bits set to 1 mean “select this bit” while bits set to 0 mean “ignore this bit.” For example, if the network mask
255.255.255.0 is applied to the IP address 100.10.50.1, the network ID is 100.10.50, and the host ID is 1. See also
binary, IP address, subnet
NIC Network Interface Card An adapter card that plugs into your computer and provides the physical interface to your
network cabling, which for Ethernet NICs is typically an RJ-45 connector. See Ethernet, RJ-45.
packet Data transmitted on a network consists of units called packets. Each packet contains a payload (the data), plus
overhead information such as where it came from (source address) and where it should go (destination address).
ping Packet Internet (or Inter-Network) Groper A program used to verify whether the host associated with an IP address is
online. It can also be used to reveal the IP address for a given domain name.
port A physical access point to a device such as a computer or router, through which data flows into and out of the device.
POTS Plain Old Telephone Service Traditional analog telephone service using copper telephone lines. Pronounced pots. See
also PSTN.
POTS splitter See splitter.
PPP
Point-to-Point Protocol A protocol for serial data transmission that is used to carry IP (and other protocol) data between
your ISP and your computer. The WAN interface on the My ADSL Modem uses two forms of PPP called PPPoA and
PPPoE. See also PPPoA, PPPoE.
PPPoA Point-to-Point Protocol over ATM One of the two types of PPP interfaces you can define for a Virtual Circuit (VC), the
other type being PPPoE. You can define only one PPPoA interface per VC.
PPPoE Point-to-Point Protocol over Ethernet One of the two types of PPP interfaces you can define for a Virtual Circuit (VC),the
other type being PPPoA. You can define one or more PPPoE interfaces per VC.
protocol A set of rules governing the transmission of data. In order for a data transmission to work, both ends of the connection
have to follow the rules of the protocol.
remote In a physically separate location. For example, an employee away on travel who logs in to the company’s intranet is a
remote user.
RIP Routing Information Protocol The original TCP/IP routing protocol. There are two versions of RIP: version and version II.
RJ-11 Registered Jack Standard-11 The standard plug used to connect telephones, fax machines, modems, etc. to a
telephone jack. It is a 6-pin connector usually containing four wires.
RJ-45 Registered Jack Standard-45 The 8-pin plug used in transmitting data over phone lines. Ethernet cabling usually uses
this type of connector.
routing Forwarding data between your network and the Internet on the most efficient route, based on the data’s destination IP
address and current network conditions. A device that performs routing is called a router.
rule See filtering rule, NAT rule.
SDNS Secondary Domain Name System (server) A DNS server that can be used if the primary DSN server is not available.
See DNS.
SNMP Simple Network Management Protocol The TCP/IP protocol used for network management.
splitter A device that splits off the voice component of the DSL signal to a separate line, so that data and telephone service
each have their own wiring and jacks. The splitter is installed by your telephone company where the DSL line enters
your home. The CO also contains splitters that separate the voice and data signals, sending voice to the PSTN and data
on high-speed lines to the Internet. See also CO, PSTN, splitterless, microfilter.