VSR1

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VSR-1 VSR-2 Very Short Reach
OC-192 Interfaces

• Russ Tuck
• tuck_at_pluris.com
• OIF PLL WG chair
• Pluris Systems Architect

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Outline

• Background
• VSR-1 parallel optics, 300m, likely lowest cost
• VSR-2 reduced-cost SR-1, 600m, SMF
• Multi-vendor Interoperability Testing

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VSR-1 VSR-2 are OIF IAs

• OIF Optical Internetworking Forum
• 300 member companies
• Carriers, Equipment Vendors, Component Vendors
• Routing and optical transport vendors
• IAs Implementation Agreements (not standards)
• PLL Physical and Link Layer Working Group
• VSR Very Short Reach SONET (POS) Interfaces
• Lower cost
• Framer interfaces
• OC-192 IAs are in products now SFI-4, SPI-4
  (phase 1 2)
• Busy with OC-768
• UNI User Network Interface (In Development)
• Router to optical transport network

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Potential VSR links (in red)
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OIF-VSR4-01.0 VSR-1

• 12 fibers _at_ 1.25 Gb/s (GigE speed)
• 850nm VCSEL lasers
• 2 multi-mode fiber (MMF) ribbons (Tx, Rx)
• 300m with 4 connectors (1 patch panel)
• 62.5µm core MMF, same as guaranteed for 500m GigE
• 400MHz.km modal bandwidth
• MTP (MPO) connectors

Patch Panel
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Built-in Forward Error Correction (FEC)

• Error on any data channel is detected by CRC
  check.
• Bad channels data block is reconstructed from
  Protection (parity) channel and good channels
• If channels are reversed (ribbon flipped),
  logic detects and compensates
  automatically.
• FEC included because easy probably not needed

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OIF-VSR4-02.0 VSR-2

• 1 fiber at 10 Gb/s
• 1310nm edge-emitting FP lasers
• Eventually also VCSELs
• 2 single-mode fibers (SMF) (Tx, Rx)
• 600m dispersion limited, 4dB loss budget
• Based on ITU-T G.691
• Allows more dispersion than SR-1
• Shorter reach
• Easier to manufacture

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VSR-1 Transponder Module

• Compatible with OIF SFI-4 electrical interface to
  framer.
• Parallel optics are available from multiple
  suppliers pin compatible interoperable.
• Field termination kits are being developed for
  ribbon fiber.

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MSA Compatible
Back side of transponders.

• Compatible with 300-pin MSA modules for 2-80km
  connector, pin-out, size, mounting, etc.

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Multiple System Vendor Interoperability
VSR-1 testing at the maximum link distance (300m)
Ribbon fiber routed same as SMF
300 meter ribbon fiber spools

• 28 hour test
• Zero errors
• BER lt 1E-16
• 6 fiber segments

CIENA Core Director
Cisco GSR router
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Multiple System Vendor Interoperability

• 12x1.25G VSR Interface was tested at max link
  length
• 300m over 6 sections of fiber and five connectors
• Results
• Demonstrated compliance with OIF spec
• Optical performance verified
• Link protection capability verified
• Demonstrated router to switch link with zero
  errors
• 28 hour test, BER lt 1E-16
• Demonstrated multiple vendor system
  interoperability
• Demonstrated multi-component vendor
  interoperability
• parallel optics from multiple vendors

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Link Protection Testing
Link Protection was demonstrated by breaking
individual fibers, simulating single element
failures - zero bit errors reported
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Selection criteria

• VSR-1
• lt 100m
• Spec 0 - 300m
• Install patch cable
• Lowest cost interface

• VSR-2
• gt 300m
• Spec 0 - 600m
• Use existing SMF
• Most like SR-1