Panasonic FP-D250 User Manual page 618

Subnet Mask IP address style mask bits used for routing operations. A Subnet
Mask defines how sub-segments of a network are treated. Usually, a router is used
to mediate communications inside and outside a local network. However, when a
LAN is divided into several "Subnets", data sent to another Subnet is relayed by a
router, just as if between remote networks.
Switching Hub An advanced hub to derive higher performance from 10BaseT or
100BaseT networks. A switching hub prevents the drop in communications speed
experienced with 10BaseT and 100BaseT when many terminals try to access at the
same time.
T
TA (Telecommunications Administration) A body, usually a company, that provides
public telecommunications services.
T1 A committee belonging to the ANSI whose role is to establish US standards for
digital telephony, particularly ISDN. The committee is in no way responsible for or
involved with the Tl (1.5Mbit/s) circuit standards.
T2 A US and Japanese standard for high-speed data transmission at 1.544Mbit/s -
24 64Kbit/s channels plus 8Kbit/s' control information are provided. Also called a
DS1.
T3 A US standard for high-speed data transmission at 44.736Mbit/s, providing the
equivalent bandwidth of 28 T1 circuits. Also called a DS3.
T-Carrier The US standards for digital transmission lines. The line types are of the
form Tn or TIC, and the corresponding line signal standards of the form DSn or
DSIC.
Tap The connecting device on cable-based LANs like Ethernet, linking to the main
transmission medium.
7-52