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Appendix E. Glossary
E-6 ATLAS 810
PLUS
User Manual 61200266L1-1
T1 circuit
Also T-1. A digital transmission link with a capacity of 1.544 Mbps. T1 uses two pairs of normal
twisted wires. T1 normally can handle 24 voice conversations with each conversation being digitized
at 64 kbps. With more advanced digital voice encoding techniques, it can handle more voice channels.
T1 is a standard for digital transmission in North America.
T3 Module
One of the ATLAS 810
PLUS
option modules. The T3 Module provides one or two channelized T3 inter-
faces.
TCP/IP
Transmission Control Protocol/Internet Protocol. A set of communications protocols that encom-
passes media access, packet transport, session communications, file transfer, electronic mail, and ter-
minal emulation.
TDM
Time Division Multiplexing. A method for sending two or more signals over a common transmission
path by assignment the path sequentially to each signal, each assignment being for a discrete time
interval.
Te l c o
Telephone company.
Telnet
A terminal emulation protocol, part of the TCP/IP suite of protocols, that provides remote terminal-
connection services. (See also VT-100.)
TFTP
Trivial File Transfer Protocol. A simplified version of the TCP/IP file transfer protocol that does not
include password protection or user-directory capability.
trunk
A direct line between two telephone switching centers.
TSU
terminal service unit.
T-Watch PRO
The ADTRAN Microsoft Widows-based management software program designed to control TSU units
from a remote PC. It also provides limited control over the configuration of the ATLAS 800 using a
graphical user interface.
VT-100
A non-intelligent terminal or terminal emulation mode used for asynchronous communications. Used
to configure the ADTRAN ATLAS 810
PLUS
.
WAN
wide area network. A network that connects users across large distances.