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Glossary
61200176L3-1 Express 4110/4120 User Manual Glossary-3
IEEE
Institute of Electrical and Electronic Engineers. Professional organization that defines
network standards. IEEE LAN standards are the predominant LAN standards today
and include protocols similar or virtually equivalent to Ethernet and Token Ring.
IEEE 802.1d
An algorithm used to prevent bridging loops by creating a spanning tree.
IEEE 802.2
An IEEE LAN protocol that specifies an implementation of the LLC sublayer of the
data link layer. It handles errors, framing, flow control, network layer (Layer 3) service
interface, and is used in LANs.
IEEE 802.3
A physical layer standard specifying a linear bus network LAN with a CSMA/CD ac-
cess method on a bus topology. Ethernet follows the 802.3 standard, transmitting at 10
megabits per second. This is the most common local area network specification. Phys-
ical variations of IEEE 802.3 include 10Base2 and 10BaseT.
in-band signalling
Signalling made up of tones which pass within the voice frequency band and are car-
ried along the same circuit as the talk path being established by the signals. Virtually
all signalling (request for service, dialing, disconnect, etc.) in the U.S. is in-band signal-
ling. Most of that signalling is MF (Multi-Frequency) dialing. The more modern form
of signalling is out-of-band.
interexchange carrier
Since divestiture, any carrier registered with the FCC authorized to carry customer
transmissions between LATAs interstate, or if approved by a state public utility com-
mission, intrastate. Includes carriers such as AT&T Communications, Satellite Busi-
ness Systems, GTE Telenet, GTE Sprint, and MCI.
information element
The name for the data fields within an ISDN Layer 3 message.
interworking
Communication between two types of networks or end equipment. This may or may
not involve a difference in signalling or protocol elements supported.
Internet Protocol
A TCP/IP protocol describing software that tracks the Internet address of nodes,
routes outgoing message, and recognizes incoming messages. Used in gateways to
connect networks at OSI network Level 3 and above.
IPX
Internetwork Packet Exchange. A Novell NetWare protocol used to move information
across networks.
ISDN
Integrated Services Digital Network. A network architecture that enables end-to-end
digital connections. The network supports diverse services through integrated access