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134 S100 User Guide – Rev. D – June 2005
SyncServer S100
Traceability
Traceability infers that the time standard used on the Time StampServer was set using time
directly or indirectly from a National Measurement Institute (NMI)
.
Transaction
An activity, such as a request or an exchange.
Triple-DES
Also called Triple Data Encryption Algorithm (TDEA), Data Encryption Standard is an
algorithm that encrypts blocks of data.
Trust
In the network security context, trust refers to privacy (the data is not viewable by
unauthorized people), integrity (the data stays in its true form), non-repudiation (the publisher
cannot say they did not send it), and authentication (the publisher--and recipient--are who
they say they are).
NMI Server
NMI Server, or NMI Server, is a standalone secure server based on the Master Clock, which
is dedicated to the creation of trusted UTC
time at the NMI.
Time StampServer (TSS)
Symmetricom’s Time StampServer (TSS) services time-stamp requests from applications,
transactions, or computer logs.
Time Master Clock (TMC)
Symmetricom’s Master Clock is a Rubidium-based master clock synchronized to UTC time
and certified by a National Measurement Institute (NMI)
.
TSA
See Time-Stamping Authority
TSP
Time-Stamp Protocol
TSR
See Time-Stamp Request
UDP/IP
User Datagram Protocol/Internet Protocol is a communications protocol that provides service
when messages are exchanged between computers in a network that uses the Internet
Protocol. It is an alternative to the Transmission Control Protocol.
USNO
U.S. Naval Observatory, in Washington, D.C., where the atomic clock that serves as the
official source of time for the United States is maintained.