oc-192 vsr interfaces russ tuck, ph.d. [email protected]
TRANSCRIPT
OC-192 VSR InterfacesRuss Tuck, Ph.D.
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)
CustomersPeering partnersInternet exchange
AccessRouter
HostRouter/switch
WAN Router
Core Router
WebServer
WebServer
OXC
DWDM
WebServer
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, 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
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
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
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
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
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
DWDMDWDM
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
Required Good OK Bad No
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
DWDMDWDM
Loss Budget – Patch Panel
How many patch panels per link? How many connectors?
VSRIF
VSRIF
PatchPanel
Patch panels: 1Connectors: 1 2 3 4Reach:
Vendor Support
How many vendors must support interoperable VSR implementations before you deploy?
• 1• 2• 3• 5• 10• 30
Why?