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S100 User Guide – Rev. D – June 2005 129
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Multiplexing
Process during which two or more signals are combined into one; at the other end, signals
are “unbundled” by a demultiplexer. TDM is Time Division Multiplexing, FDM is Frequency
Division Multiplexing, and CDMA
is Code Division Multiple Access.
National Measurement Institute (NMI)
Also known as National Metrology Institute(s), the National Measurement Institute(s) is the
national authority in each country that is usually recognized as the source of official time.
Network Time Management System (NTMS)
Symmetricom's architecture for the use of its family of products.
NIST
National Institute of Standards and Technology, the National Measurement Institute in the
United States. NIST produces standards for security and cryptography (see FIPS
documents).
NMI Server
National Measurement Institute Server
NOC
A Network Operations Center is a centralized point of network management within a large-
scale data network.
Non-repudiation
The time-stamp creates an evidentiary trail to a reliable time source that prevents a party in a
transaction from later denying when the transaction took place.
Notarization
Certification of the identity of the party in a transaction based on identifying credentials.
NTMS
Network Time Management System is a Symmetricom network management platform that
provides secure management of infrastructure devices.
NTP
Network Time Protocol is a protocol that provides a reliable way of transmitting and receiving
the time over the TCP/IP networks. The NTP, defined in IETF RFC 1305, is useful for
synchronizing the internal clock of the computers to a common time source.
OCSP
Online Certificate Status Protocol, a protocol defined in RFC 2560, enables applications to
check the status of a certificate every time the certificate is used.
OID
Object Identifier