Comtech EF Data Vipersat CDM-570 User Manual page 185

LO
Local Oscillator – A component used in upconverters, downconverters, and
transponders for frequency translation (heterodyne) of the carrier signal.
M&C Monitor & Control
MAC Media Access Control – A protocol controlling access to the physical layer of
an Ethernet network.
Mbps Mega bits per second – 1 Million bits/second. A measure of the bit rate or trans-
mission speed of a digital communication link. See also bps and kbps.
MIB Managed Information Base – A database used for managing the entities in a
communications network. Typically associated with Simple Network Manage-
ment Protocol (SNMP).
MIR Minimum Information Rate – A minimum level of service available to a remote
terminal, ensuring the ability to enter a clear channel SCPC circuit or have a
timelot in STDMA.
Modem Modulator and demodulator units combined.
Multicast Transmitting a single message simultaneously to multiple destinations (group)
on the IP network.
Multi- A command that allows multiple input choices in a single command execution.
command
NAT Network Address Translation – An Internet standard that enables a LAN to use
one set of IP addresses for internal (private) traffic and a second set of addresses
for external (public) traffic.
NBI Northbound Interface – The SNMP interface offered by the VMS to extend
services to an external network management system (NMS).
NIC Network Interface Controller – The network interface for a PC/workstation that
provides Ethernet connectivity. Depending on the computer, the NIC can either
be built into the motherboard, or be an expansion card. Some computers (e.g.,
servers) have multiple NICs, each indentified by a unique IP address.
NMS Network Management System
A p p e n d i x E - G l o s s a r y
M
N
E-7