Transcript WSON Signal Characteristics and Network Element

WSON Signal Characteristics and Network
Element Compatibility Constraints for GMPLS
draft-bernstein-ccamp-wson-compatibility-01.txt
Greg Bernstein
Young Lee
Ben Mack-Crane
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[email protected]
Grotto Networking
[email protected]
Huawei
[email protected]
Huawei
76th IETF – Hiroshima, Japan, November 2009
Scope and Purpose
• Characterize optical signals and their
attributes
• Extend the GMPLS/PCE control plane to a
combination of transparent optical and
hybrid electro optical systems where not all
network elements are compatible with all
optical signals or their attributes.
• Provision important optional processing
functions at nodes, such as regeneration, as
part of optical path establishment
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76th IETF – Hiroshima, Japan, November 2009
Revised Document Outline
• Optical Signals in WSONs
• Electro-Optical Systems
– Regenerators, OEO switches, and wavelength
converters
• Further Characterizing WSON NEs
– Input and Output signal constraints; Processing
Capabilities
• Networking Scenarios & the Control Plane
– Fixed and shared regenerators; reconfigurable
regenerators; relation to translucent networks
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Modulation format and parameters:
This can change along a path.
FEC use and type: This can change
along a path
Center frequency (wavelength). Can
change along a path.
Bit rate. Does not change along a path
Client signal type (G-PID): Does not
change along a path.
76th IETF – Hiroshima, Japan, November 2009
Already in GMPLS
Can change along
a path
Optical Signal Parameters/Attributes
Characterizing network elements
• Input Constraints
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Acceptable modulation formats
Client Signal (GPID) restrictions
Bit rate restrictions
FEC coding restrictions
Configurability: none, self-configuring, required
76th IETF – Hiroshima, Japan, November 2009
Characterizing network elements (cont.)
• Output Constraints
– Output modulation is the same as input
modulation (default)
– A limited set of output modulations is available
(more that one requires configuration)
– Output FEC is the same as input FEC (default)
– A limited set of output modulations is available
(more that one requires configuration)
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Characterizing network elements (cont.)
• Processing Capabilities
– Regeneration (fixed, selective, etc…)
– Fault and Performance Monitoring (FFS)
– Wavelength Conversion (already in RWAWSON framework)
– Switching (already in GMPLS)
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76th IETF – Hiroshima, Japan, November 2009
Networking Scenarios & GMPLS Implications
• Fixed regeneration capability
– Regenerator points are fixed and have not configurable
options
– Routing would carry compatibility information for use
in path computation.
• Shared regeneration pools
– Some nodes can selectively provide regeneration to a
signal.
– Routing would carry compatibility and processing
capability information
– Signal would include information to indicate which
nodes along a path provide regeneration
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76th IETF – Hiroshima, Japan, November 2009
Networking Scenarios & GMPLS Implications (cont.)
• Configurable regenerators
– Regenerator points have configurable input or output
options
– Routing would carry compatibility/capability
information for use in path computation.
– Signaling would include signal attributes for use in
configuring regenerators.
• Translucent Networking Scenarios (subset of
previous cases)
– Transparent Islands
– Limited number of opaque (OEO) nodes
– Limited number of nodes with shared regenerator pools
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Next Steps
• Adopt as a CCAMP WG document
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