OC192 VSR Interfaces

1
OC-192 VSR Interfaces

• Russ Tuck, Ph.D.
• tuck_at_pluris.com

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Goals and Outline

• Describe the OIF PLL WGs work on an OC-192 VSR
  IA
• Definitions
• Requirements
• Technologies
• Discuss what the requirements should be.
• Reach
• Fiber type
• Power budget
• Schedule
• Cost
• Etc.

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What is the OIF?

• Optical Internetworking Forum
• Launched in April of 1998
• Open forum 250 members including many of the
  worlds leading carriers and vendors
• The only industry group bringing together
  professionals from the packet and circuit worlds
• Mission To foster the development and deployment
  of interoperable products and services for data
  switching and routing using optical networking
  technologies

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What is the OIF PLL WG?

• Physical and Link Layer Working Group
• Three areas of work
• Very Short Reach (VSR) interfaces for OC-192
• Internal interfaces for OC-192 and OC-48
• Framer interface for POS system side
• Transponder interface framer side
• OC-768
• VSR and internal interfaces
• Other OIF WGs Arch, Signaling, OAMP
• Major Project UNI 1.0

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What is VSR? Whats an IA?

• Very Short Reach SONET/SDH interface
• Within a single facility or CO, lt 1km
• Intra-office links between routers, DWDMs, OXCs
• 1000s less than SR interfaces
• Implementation Agreement
• Compliant implementations interoperate
• OIF standard

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Potential VSR links (in red)
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Requirements (will discuss more later)

• Substantially lower cost than SR
• 300m reach
• 100m? 600m? 50m?
• 1 patch panel in path
• More patch panels?
• Transparent OXC?
• Multi-source components
• Non-requirement?
• Use installed fiber infrastructure

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Current VSR Alternatives

• 12-fiber MMF ribbon, 850nm, 1.25 Gbs/fiber
• 4-fiber MMF ribbon, 850nm, 2.5 Gbs/fiber
• 1-fiber SMF, 1310nm, 10 Gbs/fiber
• 1-fiber MMF, 850nm, 10 Gbs/fiber
• 1-fiber MMF, 4 lambda 850nm, 2.5 Gbs/lambda

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12 MMF ribbon, 850nm _at_ 1.25 Gbs

• 2 12-fiber ribbons (Tx, Rx)
• VCSEL based
• GigE speeds
• 300m with 4 connectors (1 patch panel)
• 62.5µm core MMF, same as guaranteed for 500m GigE
• 400MHz.km modal bandwidth
• MTP (MPO) connectors

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4 MMF ribbon, 850nm _at_ 2.5 Gbs

• 1 12-fiber ribbon (4 fiber Tx, 4 fiber Rx, middle
  4 unused)
• VCSEL based
• OC-48 (2x GigE) speeds
• 300m with 2 connectors (no patch panel)
• 50µm core MMF, 500MHz.km modal bandwidth
• MTP (MPO) connectors

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1 SMF, 1310nm _at_ 10 Gbs/fiber

• 2 single fibers (Tx, Rx)
• Edge-emitting FP lasers
• Eventually also VCSELs
• 10Gbs
• 600m dispersion limited, 5dB loss budget
• SMF
• Based on ITU-T G.691

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1 MMF, 850nm _at_ 10 Gbs

• 2 single fibers (Tx, Rx)
• VCSEL based
• 10Gbs
• Reach, with 4 connectors (1 patch panel)
• 25m
• 62.5µm core MMF, 160MHz.km modal bandwidth
• 85m
• 50µm core MMF, 500MHz.km modal bandwidth
• 270m
• 50µm core MMF, 2000MHz.km modal bandwidth
• gt300m if eye safety regulations change as
  expected this year

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1 MMF, 4 ? (850nm) _at_ 2.5 Gbs

• 2 single fibers (Tx, Rx)
• VCSEL based, but different wavelengths
• Optics combine and split wavelengths
• 2x GigE speeds
• 300m with 4 connectors (1 patch panel)
• Uses open fiber control
• 50µm core MMF, 500MHz.km modal bandwidth
• Duplex SC connector

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Questions?

• Ill answer some, then Ill ask you some.

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BoF Demographics

• Backbone Carriers (choose one)
• National ISPs
• Local ISPs
• Co-lo/Hosting/IXP
• Equipment Vendors
• Other
• Using DWDM (choose all that apply)
• Using OXC
• Using POS
• Using ATM
• Using OC-192
• Using OC-48

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Applications

• Which links will be first to use VSR?
• When?
• Which links will not use VSR?
• Why?

OXC
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Reach

• Which is more important?
• Long enough for all intra-office links
• (How long is that?)
• Short and cheap
• (How short?)

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Reach

• If it saves 1000/port, how long a reach does it
  need?
• 50m
• 100m
• 300m
• 600m
• If it saves 5000/port, how long a reach does it
  need?
• 50m
• 100m
• 300m
• 600m

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Fiber Type
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Fiber Lifetime

• Are VSR cables patch cords or infrastructure?
• Why?
• If infrastructure, how long must they be
  useful?
• How expensive to install?

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Interface Longevity

• How often should there be new, lower-cost links?
• How much cheaper should a new interface be?

22
Loss Budget Transparent OXC

• Will you use an OXC between routers and DWDMs (in
  next 2 years)?
• Transparent?
• OEO?
• All links?
• If transparent
• Wavelength?
• dB loss?
• SMF only?
• Must all VSR links
• support OXC? Or 2 types?

23
Loss Budget Patch Panel

• How many patch panels per link?
• How many connectors?

Patch Panel
Patch panels 1 Connectors 1
2 3
4 Reach
24
Vendor Support

• How many vendors must support interoperable VSR
  implementations before you deploy?
• 1
• 2
• 3
• 5
• 10
• 30
• Why?