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Appendix B. Glossary
Groom
The assignment and redistribution of any DS0 on any T1 circuit to any other DS0 on any on the 34 T1
circuits in a DACS.
Group of Four
The Frame Relay Consortium, composed of Cisco Systems, DEC, Nortel, and StrataCom, which
defined an interface for the UNI.
HDLC
High Level Data Link Control. A generic link-level communications protocol developed by the Inter-
national Organization for Standardization (ISO). HDLC manages synchronous code-transparent,
serial information transfers over a link connection.
IAD
Integrated Access Device. A network access device that provides many services from a single plat-
form. ATLAS is an IAD.
IARP
Inverse Address Resolution Protocol. Used for resolving the protocol address when the hardware
address is known.
ICMP
Internet Control Message Protocol. Specified in RFC-292 to provide diagnostic functions.
IP
Internet Protocol. A protocol which provides for transmitting blocks of data between hosts identified
by fixed-length addresses.
IPCP
IP Control Protocol. This is a network control protocol used for negotiating IP options for PPP.
ITU-T Q.933-A (Annex A)
See Annex A.
IXC
IntereXchange Carrier. Phone companies that connect LECs.
LEC
Local Exchange Carrier. Provides local access to public data and phone networks.
Link Integrity Poll
A poll that occurs each T391 seconds to determine the state of the connection to the frame relay switch.
LLC2
Logical Link Control Type 2. Upper portion of the Data Link layer (layer 2) that handles flow control
and error control.
LMI
Standard published by the Frame Relay Consortium in 1990 to create a defined interface on the UNI.
The Consortium was composed of Cisco Systems, DEC, Nortel, and StrataCom, and is commonly
61200263L1-1.1
ATLAS Frame Relay User Manual
B-3
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