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Glossary
Voice Gateways System Manual 97
MDI/MDIX MDI/MDIX is a type of Ethernet port connection using twisted
pair cabling. The MDI (for Medium Dependent Interface) is the
component that provides the physical and electrical connection
to the cabling medium. An MDIX (for MDI crossover) is a
version of MDI that enables connection between like devices.
MDI ports connect to MDIX ports via straight-through twisted
pair cabling; both MDI-to-MDI and MDIX-to-MDIX connections
use crossover twisted pair cabling. The design of Auto
MDI/MDIX or Auto Crossover is used to automatically identify
the cable type and internally switch over the TX/RX paired
signals.
MIB Management Information Base. A database of objects that can
be monitored by a network management system. SNMP uses
standardized MIB formats that allow any SNMP tools to
monitor any device defined by a MIB.
NAT Network Address Translation: An IETF standard that allows an
organization to present itself to the Internet with far fewer IP
addresses than there are nodes on its internal network. The
NAT technology, which is typically implemented in a router,
converts private IP addresses (such as in the 192.168.0.0
range) of the machine on the internal private network to one or
more public IP addresses for the Internet. It changes the
packet headers to the new address and keeps track of each
session. When packets come back from the Internet, NAT
performs the reverse conversion to the IP address of the client
machine.
NTP Network Time Protocol: A protocol used to update the real time
clock in a computer. There are numerous primary and
secondary servers in the Internet that are synchronized to the
Coordinated Universal Time (UTC) via radio, satellite or
modem. For more information, visit www.ntp.org
.
POTS Plain Old Telephone System. A basic analog telephone
equipment.