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Glossary R
Centillion 1200N ATM Switch User Manual B-63
NTP 297-8103-903
RIF
Rate Increase Factor: This controls the amount by which the cell transmission rate
may increase upon receipt of an RM-cell. The additive increase rate
AIR=PCR*RIF. RIF is a power of 2, ranging from 1/32768 to 1.
RISC
Reduced Instruction Set Computing: A computer processing technology in which
a microprocessor understands a few simple instructions thereby providing fast,
predictable instruction flow.
RM
Resource Management: Resource Management is the management of critical
resources in an ATM network. Two critical resources are buffer space and trunk
bandwidth. Provisioning may be used to allocate network resources in order to
separate traffic flows according to service characteristics. VPCs play a key role in
resource management. By reserving capacity on VPCs, the processing required to
establish individual VCCs is reduced. Refer to RM-cell.
RM-Cell
Resource Management Cell: Information about the state of the net work like
bandwidth availability, state of congestion, and impending congestion, is conveyed
to the source through special control cells called Resource Management Cells (RM-
cells).
RO
Read-Only: Attributes which are read-only can not be written by Network
Management. Only the PNNI Protocol entity may change the value of a read-only
attribute. Network Management entities are restricted to only reading such read-
only attributes. Read-only attributes are typically for statistical information,
including reporting result of actions taken by auto-configuration.
ROM
Read Only Memory: Computer memory which can only be read from.New data
cannot be entered and the existing data is non-volatile.This means it stays there
even when power is turned off.
Root Node
A node of a tree stucture that has no parent nodes.
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1.IBM Dictionary of Computing