OC-192 VSR Interfaces Russ Tuck, Ph.D.

Goals and Outline  Describe the OIF PLL WG’s work on an OC-192 VSR IA Definitions Requirements Technologies  Discuss what the requirements should be. Reach Fiber type Power budget Schedule Cost Etc.

What is the OIF?  Optical Internetworking Forum  Launched in April of 1998  Open forum: 250 members including many of the world’s 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

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, OAM&P Major Project: UNI 1.0

What is VSR? What’s an IA?  Very Short Reach SONET/SDH interface Within a single facility or CO, < 1km Intra-office links between routers, DWDMs, OXCs $1000s less than SR interfaces  Implementation Agreement Compliant implementations interoperate OIF “standard”

Potential VSR links (in red) Customers Peering partners Internet exchange Access Router Host Router/switch WAN Router Core Router Web Server Web Server OXC DWDM Web Server DWDM

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

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

12 MMF ribbon, 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 VSR IF VSR IF Patch Panel

4 MMF ribbon, 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 VSR IF VSR IF

1 SMF, 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

1 MMF, 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 >300m if eye safety regulations change as expected this year VSR IF VSR IF Patch Panel

1 MMF, 4 λ 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 VSR IF VSR IF Patch Panel

Questions?  I’ll answer some, then I’ll ask you some.

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

Applications  Which links will be first to use VSR? When?  Which links will not use VSR? Why? OXC DWDM

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

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

Fiber Type RequiredGoodOKBadNo Way Don’t Care Use existing installed fiber. SMF? MMF? Serial? Ribbon (parallel)? High-BW MMF?

Fiber Lifetime  Are VSR cables “patch cords” or “infrastructure”? Why?  If “infrastructure”, how long must they be useful? How expensive to install?

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

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? OXC DWDM

Loss Budget – Patch Panel  How many patch panels per link?  How many connectors? VSR IF VSR IF Patch Panel Patch panels: 1 Connectors: Reach:

Vendor Support  How many vendors must support interoperable VSR implementations before you deploy?  Why?