Nortel-networks NB5PLUS4/W Manuel d'utilisateur télécharger pdf (Page 105)

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splitterless A type of DSL installation where no splitter is installed,

saving the cost of a service call by the telephone compa-

ny. Instead, each jack in the home carries both voice and

data, requiring a microlter for each telephone to prevent

interference from the data signal. ADSL is usually split-

terless; if you are unsure if your installation has a splitter,

ask your DSL provider. See also splitter, microlter.

subet A subnet is a portion of a network. The subnet is dis-

tinguished 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.

subet mask A mask that denes a subnet. See also network mask.

TCP See TCP/IP.

TCP/IP Transmission Control Protocol/Internet Protocol The basic

protocols used on the Internet. TCP is responsible for di-

viding data up into packets for delivery and reassembling

them at the destination, while IP is responsible for deliv-

ering 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.

Telet An interactive, character-based program used to access a

remote computer. While HTTP (the web protocol) and FTP

only allow you to download les from a remote computer,

Telnet allows you to log into and use a computer from a

remote location.

TFTP Trivial File Transfer Protocol. A protocol for le transfers,

TFTP is easier to use than File Transfer Protocol (FTP) but

not as capable or secure.

TTL Time To Live A eld 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

eld by one. When the TTL reaches zero, the packet is

discarded.

twisted pair The ordinary copper telephone wiring long used by tel-

ephone 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.

upstream The direction of data transmission from the user to the

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