OC-192 VSR Interfaces Russ Tuck, Ph.D. [email protected].
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Transcript of OC-192 VSR Interfaces Russ Tuck, Ph.D. [email protected].
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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
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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, OAM&P• Major Project: UNI 1.0
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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”
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Potential VSR links (in red)
CustomersPeering partnersInternet exchange
AccessRouter
HostRouter/switch
WAN Router
Core Router
WebServer
WebServer
OXC
DWDM
WebServer
DWDM
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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 @ 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
VSRIF
VSRIF
PatchPanel
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4 MMF ribbon, 850nm @ 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
VSRIF
VSRIF
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1 SMF, 1310nm @ 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 @ 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
VSRIF
VSRIF
PatchPanel
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1 MMF, 4 λ (~850nm) @ 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
VSRIF
VSRIF
PatchPanel
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Questions?
I’ll answer some, then I’ll 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
DWDMDWDM
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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
Required Good OK Bad No
Way
Don’t
Care
Use existing installed fiber.
SMF?
MMF?
Serial?
Ribbon (parallel)?
High-BW MMF?
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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?
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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
DWDMDWDM
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Loss Budget – Patch Panel
How many patch panels per link? How many connectors?
VSRIF
VSRIF
PatchPanel
Patch panels: 1Connectors: 1 2 3 4Reach:
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Vendor Support
How many vendors must support interoperable VSR implementations before you deploy?
• 1• 2• 3• 5• 10• 30
Why?