OC-192 VSR InterfacesRuss Tuck, Ph.D.

tuck@pluris.com

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?