3Com CommWorks 5210, User Manual

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Appendix : Glossary 135
LRJ Location Reject—This is a call flow message.
LRQ Location Request—This is a call flow message.
MBP Management Bus Protocol—This protocol was developed by 3Com and is used in
the NMC to communicate to the other cards in the Total Control chassis.
MFC Multifrequency Compelled—An E1 call setup protocol that requires the signals to
be acknowledged.
MIB Management Information Base—A key element of SNMP management systems. A
collection of objects that can be accessed via a network management protocol;
holds information about all resources managed by a network management
system.
NAC Network Access Card—the card in front of the Total Control chassis. It connects to
the NIC in back. It allows the Total Control chassis to receive information from the
NMC, then processes it and sends it out the NIC.
NANP North American Numbering Plan—The scheme used to identify the telephone
trunks. It is composed of a three digit prefix and the four-digit suffix.
NDC National Destination Code—Used to identify a Public Land Mobile Network
(PLMN) within a country.
NAC Network Application Card—In the Total Control chassis, this card is located in the
front of the chassis. It allows communication to the VoIP application.
NIC Network Interface Cards—In the Total Control chassis, this card is located in the
back of the chassis. It allows access to the network.
NMC Network Management Card—The NMC provides the management of all the cards
in the Total Control chassis.
NLP Non-Linear Processing—Processing of a request for service that does not take the
normal route as defined by the PSTN.
NMC Network Management Card—Manages all of the devices in the Total Control
chassis under the direction of a PC running IP Telephony Manager software.
NSM Non-Standard Message—A type of non-standard message that is allowed by ITU
T.30.
NTFS NT File System — The file system on Windows NT servers.
NTP Network Time Protocol—Protocol built on top of TCP that assures accurate local
time-keeping with reference to radio and atomic clocks located on the internet.
This protocol is capable of synchronizing distributed clocks within milliseconds
over long time periods.
NVRAM Non-volatile Random Access Memory—Ram that retains its contents when a unit
is turned off.