Cyan Z-Series Engineering and Planning Guide Release 5.0
Page 212 © 2013 Cyan, Inc. Proprietary Information 700-0023-05-00 Rev. 1
OSNR Optical Signal to Noise Ratio
OSP Outside Plant
OSPF Open Shortest Path First
OSS Operations Support System
OTM Optical Transport Module
OTN Optical Transport Network
OTS Optical Transport Section
OTU Optical Transport Unit
OUI Organizational Unique Identifier
OXC Optical cross-connect
Packet A formatted unit of data carried on a network.
PBB Provider Backbone Bridging
PBBPG Provider Backbone Bridged Protection Group
PBBN Provider Backbone Bridged Network
PBB-TE Provider Backbone Bridging with Traffic Engineering
PBB-TE provides carrier-class Ethernet switching and transport, allowing a separation of the
service layer from the transport layer.
PBT Provider Backbone Transport
PCP Priority Code Point is a 3-bit field storing the priority level for an Ethernet frame.
PDFAP Power Distribution, Fuse and Alarm Panel
PDU Protocol Data Units
PE Provider Edge
PEB Provider Edge Bridge
PEM Power Entry Module
PHY Ethernet Physical Layer entity
PIR
Peak Information Rate — Per the MEF, the PIR is the rate up to which the network will
attempt to
deliver Ethernet service frames before they are discarded. The PIR equals the CIR plus the EIR
set in the bandwidth profile and applied to the Flow Point. PIR represents the maximum
bandwidth for the Flow Point.
PLL Phase-Locked Loop
PM Performance Monitoring
PME
Packet Multiplexer Element — The Cyan Z-Series PME-412 and PME-216i modules are
high-capacity Ethernet switches providing MEF-compliant services with optional carrier
Ethernet transport. PME-412 and PME-216i modules are supported in the Cyan Z-Series
multi-layer transport platforms for 10G transport using OTN over DWDM or 10GbE.
Point-to-Point EVC An EVC with exactly two UNIs.
Priority Tagging
Allows the user to set a field within the Ethernet packet so that it can have a higher (or lower)
priority than other packets in the same network.
PSW
Packet Switch module — Cyan Z-Series PSW-10G10 and PSW-
618 modules are optimized for
high-capacity Ethernet aggregation and end-to-end packet transport solutions. Both PSW
modules provide GbE switching function with OTU2 for transport over OEO or ROADM optical
networks and can be deployed in the Cyan Z77 platform.
Q-in-Q A provider bridge extension in 802.1Q VLAN tag. Also referred to a "stackable VLANs."
QoS Quality of Service
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