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4 Ports 11g Wireless ADSL2/2+ Router 174
onto and out of a single telephone line for transmission to the CO.
IP: Internet Protocol: The method by which information is sent from one computer to another through the
Internet. Each of these host computers have a unique IP address which distinguishes it from all the other
computers on the internet. Each packet of data sent includes the sender’s IP address and the receiver’s IP
address.
LAN: Local Area Network: A group of computers, typically covering a small geographic area, that share
devices such as printers, hard disk drives, scanners, and optical drives. Computers in a LAN typically share
an internet connection through some sort of router that connects the computers to a WAN.
LLC: Logical Link Control: Provides an interface point to the MAC sublayer. LLC Encapsulation is needed
when several protocols are carried over the same Virtual Circuit.
MAC Address: Media Access Control Address: A unique hardware number on a computer or device that
identifies it and relates it to the IP address of that device.
MC: Multicast: Communication involving a single sender and multiple specific receivers in a network.
MRU: Maximum Receive Unit: MRU: Maximum Receive Unit (MRU) is the largest size packet that can be
received by the modem. During the PPP negotiation, the peer of the PPP connection will indicate its MRU
and will accept any value up to that size. The actual MTU of the PPP connection will be set to the smaller of
the two (MTU and the peer’s MRU). In the normal negotiation, the peer will accept this MRU and will not send
packet with information field larger than this value.
MSS: Maximum Segment Size: The largest size of data that TCP will send in a single, unfragmented IP
packet. When a connection is established between a LAN client and a host in the WAN side, the LAN client
and the WAN host will indicate their Maximum Segment Size during the TCP connection handshake.
MTU: Maximum Transmission Unit: The largest size packet that can be sent by the modem. If the network
stack of any packet is larger than the MTU value, then the packet will be fragmented before the transmission.
During the PPP negotiation, the peer of the PPP connection will indicate its MRU and will accept any value up
to that size. The actual MTU of the PPP connection will be set to the smaller of the two (MTU and the peer’s
MRU).
NAPT: Network Address and Port Translation: An extension of NAT, NAPT maps many private internal
addresses into one IP address. The outside network (WAN) can see this one IP address but it cannot see the
individual device IP addresses translated by the NAPT.