Cisco ASR 5000 series Product Overview page 989

Glossary
RADIUS. Remote Authentication Dial In User Service. A group of protocols used to provide AAA functionality for
users through a defined server.
RAN or RN. Radio Access Network or Radio Network. The culmination of BTS's and BSC's, including the PCF in 3G
networks.
RAT. Radio Access Technologies.
RAT-related TMSI. When the UE is camping on an E-UTRAN cell, the RAT-related TMSI is the GUTI; when it is
camping on a GERAN or UTRAN cell, the RAT-related TMSI is the P-TMSI.
Rating Group. Information that identifies a user plane data traffic category and is used by the online and offline
charging systems for rating purposes.
RCC. Redundancy Crossbar Card. Interface card within the system that provides redundant connectivity for LCs upon a
processing card failure.
RCT. Recovery Control Task. A system software task that controls the automatic failover and restart of other tasks
within the system. Each recovery action is directed to the RCT from the HAT.
Reverse Tunnel. The direction of encapsulate data traveling from the Foreign Agent to the Home Agent.
Registration Area. A registration area is an area in which mobile stations may roam without a need to perform location
registration. The registration area corresponds to location area (LA) for performing location updating procedure, to
routing area for performing the GPRS attach or routing area update procedures, and to list oftracking areas (TAs) for
performing the EPS attach or tracking area update procedure. The PLMN to which a cell belongs (PLMN identity) is
given in the system information transmitted on the BCCH (MCC + MNC part of LAI). In a shared network a cell
belongs to all PLMNs given in the system information transmitted on the BCCH.
Registration. This is the process of camping on a cell of the PLMN and doing any necessary LRs.
RFC. Request for Comments. A document that contains Internet standards and protocols, along with other useful
information that has relevance to the Internet community. RFCs provide developers the rules and directions on how to
implement various Internet communications functions so that they adhere with, are interoperable to, other vendors'
implementations of the same function. RFCs are controlled by the International Engineering Task Force (IETF).
R-P. The interface that exists between the PCF and the PDSN in a CDMA2000 network.
R-P VPN. A routing domain for the ingress R-P protocol consisting of a group of physical or logical interfaces with an
associated configuration. The system supports multiple R-P VPNs, and does not forward packets between multiple
routing domains.
Redirection. A message that is intended to cause a change in the routing behavior of the node receiving it.
Registration. The process by which the mobile node informs the home agent about its current care-of address .
Remote redirection. A redirect sent from a source not present on the local network. The source can be located
anywhere in the global Internet and may have malicious intent and be untraceable.
Replay attacks. A security violation whereby a malicious entity attempts to imitate a transaction recorded during a
previous and valid transaction between two protocol entities. Both protocol entities have to be aware that the subsequent
identical traffic streams may no longer be valid. Since the previous transaction was valid, the algorithms for detecting
replay attacks need to incorporate data that can never be reproduced in any correct subsequent transaction.
RM. Resource Management subsystem. This group of software tasks assigns resources to other tasks within the
system as they are initiated and monitors all resource allocations.
RMU. Rack Mounting Unit. A unit of measurement used in telecommunications to denote the amount of vertical space
required to place a network device into an equipment cabinet or telecommunications rack. Each RMU is equivalent to
1.75 in. (4.45 cm.) in height.
Route optimization. A process that enables the delivery of packets directly to the care-of address from a correspondent
node without having to detour through the home network.
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