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List of terms
Nortel Multiservice Switch 7400/15000/20000
Terminology
NN10600-005 7.2S1 Standard
PCR7.2 and up March 2006
Copyright © 2006, Nortel Nortel Confidential
transmission facilities (high-quality digital facilities), which are affected by far
fewer transmission errors. Furthermore, many functions such as sequencing
flow control and retransmission are performed by end user equipment.
Frame relay-to-ATM interworking function (FR-ATM IWF)
A Nortel Multiservice Switch frame relay service that provides interworking
functions between frame relay PVCs and ATM PVCs using AAL-5.
See also, FR-ATM interworking service (page 56).
FR-ATM accounting
An accounting service that collects usage information (byte and frame counts)
on FR-ATM connections. Service providers can use this information to bill their
customers, or for test, statistics, network engineering, and planning purposes.
FR-ATM gateway
An application of the FR-ATM interworking service that converts frame/cell
traffic to and from ATM cell traffic. The FR-ATM gateway provides a frame
relay interface (either UNI or NNI) that converts frame relay traffic coming in
from its link into cells leaving the node at an ATM interface. In the other
direction, the gateway converts cell traffic coming into the node at the ATM
interface to frame relay traffic going out on the frame relay UNI or NNI. The
FR-ATM services frame relay traffic originating across the frame/cell subnet.
FR-ATM interworking service
The FR-ATM interworking service allows the carriage of frame relay traffic
over an ATM networking and transport infrastructure. It maps frame relay
permanent virtual circuits (PVCs) to and from ATM PVCs to provide
connectivity between frame relay CPE and ATM-capable CPE. The FR-ATM
interworking service comprises a core frame relay UNI/NNI service and an
interworking function.
The FR-ATM interworking supports the application of the FRF.8 standard for
service interworking (SIWF) and the FRF.5 standard for network interworking
(NIWF).
free list
The part of the shared memory that is currently unused and available for data
arriving into the FP card.
free list size
The number of blocks that currently make up the free list.