NetComm NB4 User Manual page 72

splitterless
subnet
subnet mask
TCP
TCP/IP
Telnet
TFTP
TTL
twisted pair
upstream
NB4 User Guide
72
A type of DSL installation where no splitter is installed, saving
the cost of a service call by the telephone company. Instead, each
jack in the home carries both voice and data, requiring a
microfilter for each telephone to prevent interference from the
data signal. ADSL is usually splitterless; if you are unsure if your
installation has a splitter, ask your DSL provider. See also splitter,
microfilter.
A subnet is a portion of a network. The subnet is distinguished
from the larger network by a subnet mask which selects some of
the computers of the network and excludes all others. The
subnet's computers remain physically connected to the rest of
the parent network, but they are treated as though they were on a
separate network. See also network mask.
A mask that defines a subnet. See also network mask.
See TCP/IP.
Transmission Control Protocol/Internet Protocol The basic
protocols used on the Internet. TCP is responsible for dividing
data up into packets for delivery and reassembling them at the
destination, while IP is responsible for delivering the packets
from source to destination. When TCP and IP are bundled with
higher-level applications such as HTTP, FTP, Telnet, etc., TCP/IP
refers to this whole suite of protocols.
An interactive, character-based program used to access a remote
computer. While HTTP (the web protocol) and FTP only allow
you to download files from a remote computer, Telnet allows
you to log into and use a computer from a remote location.
Trivial File Transfer Protocol. A protocol for file transfers, TFTP
is easier to use than File Transfer Protocol (FTP) but not as
capable or secure.
Time To Live A field in an IP packet that limits the life span of
that packet. Originally meant as a time duration, the TTL is
usually represented instead as a maximum hop count; each
router that receives a packet decrements this field by one. When
the TTL reaches zero, the packet is discarded.
The ordinary copper telephone wiring long used by telephone
companies. It contains one or more wire pairs twisted together to
reduce inductance and noise. Each telephone line uses one pair.
In homes, it is most often installed with two pairs. For Ethernet
LANs, a higher grade called Category 3 (CAT 3) is used for
10BASE-T networks, and an even higher grade called Category 5
(CAT 5) is used for 100BASE-T networks. See also 10BASE-T,
100BASE-T, Ethernet.
The direction of data transmission from the user to the Internet.
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