Cyan Z-Series Engineering and Planning Guide Release 5.0
700-0023-05-00 Rev. 1 © 2013 Cyan, Inc. Proprietary Information Page 213
R-APS
Ethernet Ring Automatic Protection Switching — The R-
APS protocol manages the protection of
all nodes on the ring. R-APS coordinates protection switching on and off of the RPL link.
RCM Ring Closure Module
RDI Remote Defect Indication
RFC Request For Comment (IETF standards tracking documents)
RHEL Red Hat Enterprise Linux
ROADM Reconfigurable Optical Add Drop Multiplexer
RPG Ethernet Ring Protection Group
RPL Ring Protection Link
RPM Red Hat Package Manager
– or –
RPM Package Manager
RPR Resilient Packet Ring
RS Regeneration Section
The Regeneration Section provides supervision of segments between optical regenerators.
– or –
Reed-Solomon
Reed-Solomon codes are linear block codes that can detect and correct burst errors. G.975
uses an RS code to pr
oduce redundant information that gets concatenated with the signal to be
transmitted. This additional information is used on the receive interface to help identify and
correct transmission errors. The RS encoding provides significant correction capability and low
error burst sensitivity.
RSTP
Rapid Spanning Tree Protocol — As defined in IEEE 802.1D-2004, configures full, simple and
symmetric connectivity throughout a bridged LAN that comprises individual LANs
interconnected by bridges. RSTP supersedes Spanning Tree Protocol (STP). RSTP
interoperates with STP to facilitate migration. RSTP provides faster spanning tree recovery
(convergence time) after a topology change.
RU Rack Unit
One rack unit is 1.75 inches in height. Racked equipment is specified to be mounted in
increments of RUs in height.
RX Receive
SAN Storage Area Network
SAP Service Access Point
SAPI Source Access Point Identifier
SDH Synchronous Digital Hierarchy
Service Frame
An Ethernet frame transmitted across the UNI toward the service
provider or an Ethernet frame
transmitted across the UNI toward the subscriber.
Service Multiplexing A UNI attribute in which the UNI can be in more than one EVC instance.
Service Provider The organization providing voice, data, video, and Ethernet service(s).
SFP Small form-factor pluggable
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