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Overview Installation Troubleshooting Contact
network layer
Layer 3 in the OSI architecture that provides services to establish a path between open systems. The
network layer knows the address of the neighboring nodes, packages output with the correct network
address data, selects routes, and recognizes and forwards to the transport layer incoming messages
for local host domains.
NIC
A network interface card converts computer data to serial data in a packet format that it sends over the
LAN. A NIC is installed in an expansion slot or can be built-in. Every Ethernet NIC has a MAC address
permanently saved in its ROM.
node
On a LAN, a generic term for any network device.
On an HFC network, the interface between the fiber-optic trunk and coaxial cable feeders to
subscriber locations. A node is typically located in the subscriber neighborhood.
noise
Random spurts of electrical energy or interface. May produce a salt-and-pepper pattern on a television
picture.
O
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ohm
A unit of electrical resistance.
OOB DTMF
Out-of-band dual tone multi-frequency signals are generated when you press the keys of an ordinary
telephone. In the United States, it is referred to as a "touch-tone" phone (formerly a registered
trademark of AT&T).
OSI
The Open Systems Interconnection reference model is an illustrative model describing how data
moves from an application on the source host through a network to an application on the destination
host. It is a conceptual framework developed by ISO that is now the primary model for intercomputer
communications. OSI is a model only; it does not define a specific networking interface.
VT2400/VT2500 Series Voice Gateway User Guide
Configuration: Basic
Advanced
FAQ Specifications Glossary License
TCP/IP
Wireless
button.
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